source: vbox/trunk/src/VBox/Frontends/VirtualBox/src/globals/UIMessageCenter.cpp@ 44503

/* $Id: UIMessageCenter.cpp 44503 2013-02-01 06:28:53Z vboxsync $ */
/** @file
 *
 * VBox frontends: Qt GUI ("VirtualBox"):
 * UIMessageCenter class implementation
 */

/*
 * Copyright (C) 2006-2012 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */

/* Qt includes: */
#include <QDir>
#include <QDesktopWidget>
#include <QFileInfo>
#include <QLocale>
#include <QThread>
#include <QProcess>
#ifdef Q_WS_MAC
# include <QPushButton>
#endif /* Q_WS_MAC */

/* GUI includes: */
#include "UIMessageCenter.h"
#include "VBoxGlobal.h"
#include "UISelectorWindow.h"
#include "UIProgressDialog.h"
#include "UINetworkManager.h"
#include "UINetworkManagerDialog.h"
#include "UIConverter.h"
#ifdef VBOX_OSE
# include "UIDownloaderUserManual.h"
#endif /* VBOX_OSE */
#include "UIMachine.h"
#include "VBoxAboutDlg.h"
#include "UIHotKeyEditor.h"
#ifdef Q_WS_MAC
# include "VBoxUtils-darwin.h"
#endif /* Q_WS_MAC */
#ifdef Q_WS_WIN
# include <Htmlhelp.h>
#endif /* Q_WS_WIN */

/* COM includes: */
#include "CConsole.h"
#include "CMachine.h"
#include "CSystemProperties.h"
#include "CVirtualBoxErrorInfo.h"
#include "CMediumAttachment.h"
#include "CMediumFormat.h"
#include "CAppliance.h"
#include "CExtPackManager.h"
#include "CExtPackFile.h"
#include "CHostNetworkInterface.h"
#ifdef VBOX_WITH_DRAG_AND_DROP
# include "CGuest.h"
#endif /* VBOX_WITH_DRAG_AND_DROP */

/* Other VBox includes: */
#include <iprt/err.h>
#include <iprt/param.h>
#include <iprt/path.h>

bool UIMessageCenter::isAnyWarningShown()
{
    /* Check if at least one warning is alive!
     * All warnings are stored in m_warnings list as live pointers,
     * this is why if some warning was deleted from another place,
     * its pointer here will equal NULL... */
    for (int i = 0; i < m_warnings.size(); ++i)
        if (m_warnings[i])
            return true;
    return false;
}

bool UIMessageCenter::isAlreadyShown(const QString &strWarningName) const
{
    return m_strShownWarnings.contains(strWarningName);
}

void UIMessageCenter::setShownStatus(const QString &strWarningName)
{
    if (!m_strShownWarnings.contains(strWarningName))
        m_strShownWarnings.append(strWarningName);
}

void UIMessageCenter::clearShownStatus(const QString &strWarningName)
{
    if (m_strShownWarnings.contains(strWarningName))
        m_strShownWarnings.removeAll(strWarningName);
}

void UIMessageCenter::closeAllWarnings()
{
    /* Broadcast signal to perform emergent
     * closing + deleting all the opened warnings. */
    emit sigToCloseAllWarnings();
}

/**
 *  Shows a message box of the given type with the given text and with buttons
 *  according to arguments b1, b2 and b3 (in the same way as QMessageBox does
 *  it), and returns the user's choice.
 *
 *  When all button arguments are zero, a single 'Ok' button is shown.
 *
 *  If pcszAutoConfirmId is not null, then the message box will contain a
 *  checkbox "Don't show this message again" below the message text and its
 *  state will be saved in the global config. When the checkbox is in the
 *  checked state, this method doesn't actually show the message box but
 *  returns immediately. The return value in this case is the same as if the
 *  user has pressed the Enter key or the default button, but with
 *  AutoConfirmed bit set (AutoConfirmed alone is returned when no default
 *  button is defined in button arguments).
 *
 *  @param  pParent
 *      Parent widget or 0 to use the desktop as the pParent. Also,
 *      #mainWindowShown can be used to determine the currently shown VBox
 *      main window (Selector or Console).
 *  @param  type
 *      One of values of the Type enum, that defines the message box
 *      title and icon.
 *  @param  strMessage
 *      Message text to display (can contain simple Qt-html tags).
 *  @param  strDetails
 *      Detailed message description displayed under the main message text using
 *      QTextEdit (that provides rich text support and scrollbars when necessary).
 *      If equals to QString::null, no details text box is shown.
 *  @param  pcszAutoConfirmId
 *      ID used to save the auto confirmation state across calls. If null,
 *      the auto confirmation feature is turned off (and no checkbox is shown)
 *  @param  button1
 *      First button code or 0, see QIMessageBox for a list of codes.
 *  @param  button2
 *      Second button code or 0, see QIMessageBox for a list of codes.
 *  @param  button3
 *      Third button code or 0, see QIMessageBox for a list of codes.
 *  @param  strText1
 *      Optional custom text for the first button.
 *  @param  strText2
 *      Optional custom text for the second button.
 *  @param  strText3
 *      Optional custom text for the third button.
 *
 *  @return
 *      code of the button pressed by the user
 */
int UIMessageCenter::message(QWidget *pParent, Type type, const QString &strMessage,
                             const QString &strDetails /* = QString::null */,
                             const char *pcszAutoConfirmId /* = 0 */,
                             int button1 /* = 0 */,
                             int button2 /* = 0 */,
                             int button3 /* = 0 */,
                             const QString &strText1 /* = QString::null */,
                             const QString &strText2 /* = QString::null */,
                             const QString &strText3 /* = QString::null */) const
{
    if (button1 == 0 && button2 == 0 && button3 == 0)
        button1 = QIMessageBox::Ok | QIMessageBox::Default;

    CVirtualBox vbox;
    QStringList msgs;

    if (pcszAutoConfirmId)
    {
        vbox = vboxGlobal().virtualBox();
        msgs = vbox.GetExtraData(GUI_SuppressMessages).split(',');
        if (msgs.contains(pcszAutoConfirmId))
        {
            int rc = AutoConfirmed;
            if (button1 & QIMessageBox::Default)
                rc |= (button1 & QIMessageBox::ButtonMask);
            if (button2 & QIMessageBox::Default)
                rc |= (button2 & QIMessageBox::ButtonMask);
            if (button3 & QIMessageBox::Default)
                rc |= (button3 & QIMessageBox::ButtonMask);
            return rc;
        }
    }

    QString title;
    QIMessageBox::Icon icon;

    switch (type)
    {
        default:
        case Info:
            title = tr("VirtualBox - Information", "msg box title");
            icon = QIMessageBox::Information;
            break;
        case Question:
            title = tr("VirtualBox - Question", "msg box title");
            icon = QIMessageBox::Question;
            break;
        case Warning:
            title = tr("VirtualBox - Warning", "msg box title");
            icon = QIMessageBox::Warning;
            break;
        case Error:
            title = tr("VirtualBox - Error", "msg box title");
            icon = QIMessageBox::Critical;
            break;
        case Critical:
            title = tr("VirtualBox - Critical Error", "msg box title");
            icon = QIMessageBox::Critical;
            break;
        case GuruMeditation:
            title = "VirtualBox - Guru Meditation"; /* don't translate this */
            icon = QIMessageBox::GuruMeditation;
            break;
    }

    QPointer<QIMessageBox> box = new QIMessageBox(title, strMessage, icon, button1, button2,
                                                  button3, pParent, pcszAutoConfirmId);
    connect(this, SIGNAL(sigToCloseAllWarnings()), box, SLOT(deleteLater()));

    if (!strText1.isNull())
        box->setButtonText(0, strText1);
    if (!strText2.isNull())
        box->setButtonText(1, strText2);
    if (!strText3.isNull())
        box->setButtonText(2, strText3);

    if (!strDetails.isEmpty())
        box->setDetailsText(strDetails);

    if (pcszAutoConfirmId)
    {
        box->setFlagText(tr("Do not show this message again", "msg box flag"));
        box->setFlagChecked(false);
    }

    m_warnings << box;
    int rc = box->exec();
    if (box && m_warnings.contains(box))
        m_warnings.removeAll(box);

    if (pcszAutoConfirmId)
    {
        if (box && box->isFlagChecked())
        {
            msgs << pcszAutoConfirmId;
            vbox.SetExtraData(GUI_SuppressMessages, msgs.join(","));
        }
    }

    if (box)
        delete box;

    return rc;
}

/** @fn message(QWidget *, Type, const QString &, const char *, int, int,
 *               int, const QString &, const QString &, const QString &)
 *
 *  A shortcut to #message() that doesn't require to specify the details
 *  text(QString::null is assumed).
 */

/** @fn messageYesNo(QWidget *, Type, const QString &, const QString &, const char *)
 *
 *  A shortcut to #message() that shows 'Yes' and 'No' buttons ('Yes' is the
 *  default) and returns true when the user selects Yes.
 */

/** @fn messageYesNo(QWidget *, Type, const QString &, const char *)
 *
 *  A shortcut to #messageYesNo() that doesn't require to specify the details
 *  text(QString::null is assumed).
 */

int UIMessageCenter::messageWithOption(QWidget *pParent,
                                       Type type,
                                       const QString &strMessage,
                                       const QString &strOptionText,
                                       bool fDefaultOptionValue /* = true */,
                                       const QString &strDetails /* = QString::null */,
                                       int iButton1 /* = 0 */,
                                       int iButton2 /* = 0 */,
                                       int iButton3 /* = 0 */,
                                       const QString &strButtonName1 /* = QString::null */,
                                       const QString &strButtonName2 /* = QString::null */,
                                       const QString &strButtonName3 /* = QString::null */) const
{
    /* If no buttons are set, using single 'OK' button: */
    if (iButton1 == 0 && iButton2 == 0 && iButton3 == 0)
        iButton1 = QIMessageBox::Ok | QIMessageBox::Default;

    /* Assign corresponding title and icon: */
    QString strTitle;
    QIMessageBox::Icon icon;
    switch (type)
    {
        default:
        case Info:
            strTitle = tr("VirtualBox - Information", "msg box title");
            icon = QIMessageBox::Information;
            break;
        case Question:
            strTitle = tr("VirtualBox - Question", "msg box title");
            icon = QIMessageBox::Question;
            break;
        case Warning:
            strTitle = tr("VirtualBox - Warning", "msg box title");
            icon = QIMessageBox::Warning;
            break;
        case Error:
            strTitle = tr("VirtualBox - Error", "msg box title");
            icon = QIMessageBox::Critical;
            break;
        case Critical:
            strTitle = tr("VirtualBox - Critical Error", "msg box title");
            icon = QIMessageBox::Critical;
            break;
        case GuruMeditation:
            strTitle = "VirtualBox - Guru Meditation"; /* don't translate this */
            icon = QIMessageBox::GuruMeditation;
            break;
    }

    /* Create message-box: */
    if (QPointer<QIMessageBox> pBox = new QIMessageBox(strTitle, strMessage, icon,
                                                       iButton1, iButton2, iButton3, pParent))
    {
        /* Append the list of all warnings with current: */
        m_warnings << pBox;

        /* Setup message-box connections: */
        connect(this, SIGNAL(sigToCloseAllWarnings()), pBox, SLOT(deleteLater()));

        /* Assign other text values: */
        if (!strOptionText.isNull())
        {
            pBox->setFlagText(strOptionText);
            pBox->setFlagChecked(fDefaultOptionValue);
        }
        if (!strButtonName1.isNull())
            pBox->setButtonText(0, strButtonName1);
        if (!strButtonName2.isNull())
            pBox->setButtonText(1, strButtonName2);
        if (!strButtonName3.isNull())
            pBox->setButtonText(2, strButtonName3);
        if (!strDetails.isEmpty())
            pBox->setDetailsText(strDetails);

        /* Show the message box: */
        int iResultCode = pBox->exec();

        /* Its possible what message-box will be deleted during some event-processing procedure,
         * in that case pBox will be null right after pBox->exec() returns from it's event-pool,
         * so we have to check this too: */
        if (pBox)
        {
            /* Cleanup the list of all warnings from current: */
            if (m_warnings.contains(pBox))
                m_warnings.removeAll(pBox);

            /* Check if option was chosen: */
            if (pBox->isFlagChecked())
                iResultCode |= QIMessageBox::OptionChosen;

            /* Destroy message-box: */
            if (pBox)
                delete pBox;

            /* Return final result: */
            return iResultCode;
        }
    }
    return 0;
}

/**
 *  Shows a modal progress dialog using a CProgress object passed as an
 *  argument to track the progress.
 *
 *  @param progress    progress object to track
 *  @param aTitle       title prefix
 *  @param pParent      pParent widget
 *  @param aMinDuration time (ms) that must pass before the dialog appears
 */
bool UIMessageCenter::showModalProgressDialog(CProgress &progress,
                                              const QString &strTitle,
                                              const QString &strImage /* = "" */,
                                              QWidget *pParent /* = 0 */,
                                              bool fSheetOnDarwin /* = false */,
                                              int cMinDuration /* = 2000 */)
{
    QPixmap *pPixmap = 0;
    if (!strImage.isEmpty())
        pPixmap = new QPixmap(strImage);

    UIProgressDialog progressDlg(progress, strTitle, pPixmap, fSheetOnDarwin, cMinDuration, pParent ? pParent : mainWindowShown());
    /* Run the dialog with the 350 ms refresh interval. */
    progressDlg.run(350);

    if (pPixmap)
        delete pPixmap;

    return true;
}

/**
 *  Returns what main window (VM selector or main VM window) is now shown, or
 *  zero if none of them. Main VM window takes precedence.
 */
QWidget* UIMessageCenter::mainWindowShown() const
{
    /* It may happen that this method is called during VBoxGlobal
     * initialization or even after it failed (for example, to show some
     * error message). Return no main window in this case: */
    if (!vboxGlobal().isValid())
        return 0;

    if (vboxGlobal().isVMConsoleProcess())
    {
        if (vboxGlobal().vmWindow() && vboxGlobal().vmWindow()->isVisible()) /* VM window is visible */
            return vboxGlobal().vmWindow(); /* return that window */
    }
    else
    {
        if (vboxGlobal().selectorWnd().isVisible()) /* VM selector is visible */
            return &vboxGlobal().selectorWnd(); /* return that window */
    }

    return 0;
}

/**
 *  Returns main machine window is now shown, or zero if none of them.
 */
QWidget* UIMessageCenter::mainMachineWindowShown() const
{
    /* It may happen that this method is called during VBoxGlobal
     * initialization or even after it failed (for example, to show some
     * error message). Return no main window in this case: */
    if (!vboxGlobal().isValid())
        return 0;

    if (vboxGlobal().vmWindow() && vboxGlobal().vmWindow()->isVisible()) /* VM window is visible */
        return vboxGlobal().vmWindow(); /* return that window */

    return 0;
}

/**
 *  Returns network access manager window if visible
 *  and window returned by mainWindowShown() otherwise.
 */
QWidget* UIMessageCenter::networkManagerOrMainWindowShown() const
{
    return gNetworkManager->window()->isVisible() ? gNetworkManager->window() : mainWindowShown();
}

/**
 *  Returns network access manager window if visible
 *  and window returned by mainMachineWindowShown() otherwise.
 */
QWidget* UIMessageCenter::networkManagerOrMainMachineWindowShown() const
{
    return gNetworkManager->window()->isVisible() ? gNetworkManager->window() : mainMachineWindowShown();
}

bool UIMessageCenter::askForOverridingFile(const QString& strPath, QWidget *pParent /* = NULL */)
{
    return messageYesNo(pParent, Question, tr("A file named <b>%1</b> already exists. Are you sure you want to replace it?<br /><br />Replacing it will overwrite its contents.").arg(strPath));
}

bool UIMessageCenter::askForOverridingFiles(const QVector<QString>& strPaths, QWidget *pParent /* = NULL */)
{
    if (strPaths.size() == 1)
        /* If it is only one file use the single question versions above */
        return askForOverridingFile(strPaths.at(0), pParent);
    else if (strPaths.size() > 1)
        return messageYesNo(pParent, Question, tr("The following files already exist:<br /><br />%1<br /><br />Are you sure you want to replace them? Replacing them will overwrite their contents.").arg(QStringList(strPaths.toList()).join("<br />")));
    else
        return true;
}

bool UIMessageCenter::askForOverridingFileIfExists(const QString& strPath, QWidget *pParent /* = NULL */)
{
    QFileInfo fi(strPath);
    if (fi.exists())
        return askForOverridingFile(strPath, pParent);
    else
        return true;
}

bool UIMessageCenter::askForOverridingFilesIfExists(const QVector<QString>& strPaths, QWidget *pParent /* = NULL */)
{
    QVector<QString> existingFiles;
    foreach(const QString &file, strPaths)
    {
        QFileInfo fi(file);
        if (fi.exists())
            existingFiles << fi.absoluteFilePath();
    }
    if (existingFiles.size() == 1)
        /* If it is only one file use the single question versions above */
        return askForOverridingFileIfExists(existingFiles.at(0), pParent);
    else if (existingFiles.size() > 1)
        return askForOverridingFiles(existingFiles, pParent);
    else
        return true;
}

void UIMessageCenter::checkForMountedWrongUSB()
{
#ifdef RT_OS_LINUX
    QFile file("/proc/mounts");
    if (file.exists() && file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        QStringList contents;
        for (;;)
        {
            QByteArray line = file.readLine();
            if (line.isEmpty())
                break;
            contents << line;
        }
        QStringList grep1(contents.filter("/sys/bus/usb/drivers"));
        QStringList grep2(grep1.filter("usbfs"));
        if (!grep2.isEmpty())
            message(mainWindowShown(), Warning,
                     tr("You seem to have the USBFS filesystem mounted at /sys/bus/usb/drivers. "
                         "We strongly recommend that you change this, as it is a severe mis-configuration of "
                         "your system which could cause USB devices to fail in unexpected ways."),
                     "checkForMountedWrongUSB");
    }
#endif
}

void UIMessageCenter::showBETAWarning()
{
    message
        (0, Warning,
         tr("You are running a prerelease version of VirtualBox. "
             "This version is not suitable for production use."));
}

void UIMessageCenter::showBEBWarning()
{
    message
        (0, Warning,
         tr("You are running an EXPERIMENTAL build of VirtualBox. "
             "This version is not suitable for production use."));
}

#ifdef Q_WS_X11
void UIMessageCenter::cannotFindLicenseFiles(const QString &strPath)
{
    message
        (0, UIMessageCenter::Error,
         tr("Failed to find license files in "
             "<nobr><b>%1</b></nobr>.")
             .arg(strPath));
}
#endif

void UIMessageCenter::cannotOpenLicenseFile(QWidget *pParent, const QString &strPath)
{
    message
        (pParent, UIMessageCenter::Error,
         tr("Failed to open the license file <nobr><b>%1</b></nobr>. "
             "Check file permissions.")
             .arg(strPath));
}

void UIMessageCenter::cannotOpenURL(const QString &strUrl)
{
    message
        (mainWindowShown(), UIMessageCenter::Error,
         tr("Failed to open <tt>%1</tt>. Make sure your desktop environment "
             "can properly handle URLs of this type.")
         .arg(strUrl));
}

void UIMessageCenter::cannotFindLanguage(const QString &strLangId, const QString &strNlsPath)
{
    message(0, UIMessageCenter::Error,
        tr("<p>Could not find a language file for the language "
            "<b>%1</b> in the directory <b><nobr>%2</nobr></b>.</p>"
            "<p>The language will be temporarily reset to the system "
            "default language. Please go to the <b>Preferences</b> "
            "dialog which you can open from the <b>File</b> menu of the "
            "main VirtualBox window, and select one of the existing "
            "languages on the <b>Language</b> page.</p>")
             .arg(strLangId).arg(strNlsPath));
}

void UIMessageCenter::cannotLoadLanguage(const QString &strLangFile)
{
    message(0, UIMessageCenter::Error,
        tr("<p>Could not load the language file <b><nobr>%1</nobr></b>. "
            "<p>The language will be temporarily reset to English (built-in). "
            "Please go to the <b>Preferences</b> "
            "dialog which you can open from the <b>File</b> menu of the "
            "main VirtualBox window, and select one of the existing "
            "languages on the <b>Language</b> page.</p>")
             .arg(strLangFile));
}

void UIMessageCenter::cannotInitCOM(HRESULT rc)
{
    message(0, Critical,
        tr("<p>Failed to initialize COM or to find the VirtualBox COM server. "
            "Most likely, the VirtualBox server is not running "
            "or failed to start.</p>"
            "<p>The application will now terminate.</p>"),
        formatErrorInfo(COMErrorInfo(), rc));
}

void UIMessageCenter::cannotInitUserHome(const QString &strUserHome)
{
    message(0, Critical,
        tr("<p>Failed to initialize COM because the VirtualBox global "
           "configuration directory <b><nobr>%1</nobr></b> is not accessible. "
           "Please check the permissions of this directory and of its parent "
           "directory.</p>"
           "<p>The application will now terminate.</p>").arg(strUserHome),
        formatErrorInfo(COMErrorInfo()));
}

void UIMessageCenter::cannotCreateVirtualBox(const CVirtualBox &vbox)
{
    message(0, Critical,
        tr("<p>Failed to create the VirtualBox COM object.</p>"
            "<p>The application will now terminate.</p>"),
        formatErrorInfo(vbox));
}

void UIMessageCenter::cannotLoadGlobalConfig(const CVirtualBox &vbox, const QString &strError)
{
    /* preserve the current error info before calling the object again */
    COMResult res(vbox);

    message(mainWindowShown(), Critical,
        tr("<p>Failed to load the global GUI configuration from "
            "<b><nobr>%1</nobr></b>.</p>"
            "<p>The application will now terminate.</p>")
             .arg(vbox.GetSettingsFilePath()),
        !res.isOk() ? formatErrorInfo(res)
                    : QString("<!--EOM--><p>%1</p>").arg(vboxGlobal().emphasize(strError)));
}

void UIMessageCenter::cannotSaveGlobalConfig(const CVirtualBox &vbox)
{
    /* preserve the current error info before calling the object again */
    COMResult res(vbox);

    message(mainWindowShown(), Critical,
        tr("<p>Failed to save the global GUI configuration to "
            "<b><nobr>%1</nobr></b>.</p>"
            "<p>The application will now terminate.</p>")
             .arg(vbox.GetSettingsFilePath()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotSetSystemProperties(const CSystemProperties &props)
{
    message(mainWindowShown(), Critical,
        tr("Failed to set global VirtualBox properties."),
        formatErrorInfo(props));
}

void UIMessageCenter::cannotAccessUSB(const COMBaseWithEI &object)
{
    /* If IMachine::GetUSBController(), IHost::GetUSBDevices() etc. return
     * E_NOTIMPL, it means the USB support is intentionally missing
     * (as in the OSE version). Don't show the error message in this case. */
    COMResult res(object);
    if (res.rc() == E_NOTIMPL)
        return;

    message(mainWindowShown(), res.isWarning() ? Warning : Error,
             tr("Failed to access the USB subsystem."),
             formatErrorInfo(res),
             "cannotAccessUSB");
}

void UIMessageCenter::cannotCreateMachine(const CVirtualBox &vbox, QWidget *pParent /* = 0 */)
{
    message(
        pParent ? pParent : mainWindowShown(),
        Error,
        tr("Failed to create a new virtual machine."),
        formatErrorInfo(vbox)
    );
}

void UIMessageCenter::cannotCreateMachine(const CVirtualBox &vbox,
                                          const CMachine &machine,
                                          QWidget *pParent /* = 0 */)
{
    message(
        pParent ? pParent : mainWindowShown(),
        Error,
        tr("Failed to create a new virtual machine <b>%1</b>.")
            .arg(machine.GetName()),
        formatErrorInfo(vbox)
    );
}

void UIMessageCenter::cannotOpenMachine(QWidget *pParent, const QString &strMachinePath, const CVirtualBox &vbox)
{
    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to open virtual machine located in %1.")
               .arg(strMachinePath),
            formatErrorInfo(vbox));
}

void UIMessageCenter::cannotRegisterMachine(const CVirtualBox &vbox,
                                            const CMachine &machine,
                                            QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to register the virtual machine <b>%1</b>.")
            .arg(machine.GetName()),
            formatErrorInfo(vbox));
}

void UIMessageCenter::cannotReregisterMachine(QWidget *pParent, const QString &strMachinePath, const QString &strMachineName)
{
    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to add virtual machine <b>%1</b> located in <i>%2</i> because its already present.")
               .arg(strMachineName).arg(strMachinePath));
}

void UIMessageCenter::cannotApplyMachineSettings(const CMachine &machine, const COMResult &res)
{
    message(
        mainWindowShown(),
        Error,
        tr("Failed to apply the settings to the virtual machine <b>%1</b>.")
            .arg(machine.GetName()),
        formatErrorInfo(res)
    );
}

void UIMessageCenter::cannotSaveMachineSettings(const CMachine &machine, QWidget *pParent /* = 0 */)
{
    /* preserve the current error info before calling the object again */
    COMResult res(machine);

    message(pParent ? pParent : mainWindowShown(), Error,
             tr("Failed to save the settings of the virtual machine "
                 "<b>%1</b> to <b><nobr>%2</nobr></b>.")
                 .arg(machine.GetName(), machine.GetSettingsFilePath()),
             formatErrorInfo(res));
}

/**
 * @param  fStrict  If |false|, this method will silently return if the COM
 *                 result code is E_NOTIMPL.
 */
void UIMessageCenter::cannotLoadMachineSettings(const CMachine &machine,
                                                bool fStrict /* = true */,
                                                QWidget *pParent /* = 0 */)
{
    /* If COM result code is E_NOTIMPL, it means the requested object or
     * function is intentionally missing (as in the OSE version). Don't show
     * the error message in this case. */
    COMResult res(machine);
    if (!fStrict && res.rc() == E_NOTIMPL)
        return;

    message(pParent ? pParent : mainWindowShown(), Error,
             tr("Failed to load the settings of the virtual machine "
                 "<b>%1</b> from <b><nobr>%2</nobr></b>.")
                .arg(machine.GetName(), machine.GetSettingsFilePath()),
             formatErrorInfo(res));
}

bool UIMessageCenter::confirmedSettingsReloading(QWidget *pParent)
{
    int rc = message(pParent, Question,
                     tr("<p>The machine settings were changed while you were editing them. "
                        "You currently have unsaved setting changes.</p>"
                        "<p>Would you like to reload the changed settings or to keep your own changes?</p>"), 0,
                     QIMessageBox::Yes, QIMessageBox::No | QIMessageBox::Default | QIMessageBox::Escape, 0,
                     tr("Reload settings"), tr("Keep changes"), 0);
    return rc == QIMessageBox::Yes;
}

void UIMessageCenter::warnAboutStateChange(QWidget *pParent)
{
    if (isAlreadyShown("warnAboutStateChange"))
        return;
    setShownStatus("warnAboutStateChange");

    message(pParent ? pParent : mainWindowShown(), Warning,
            tr("The virtual machine that you are changing has been started. "
               "Only certain settings can be changed while a machine is running. "
               "All other changes will be lost if you close this window now."));

    clearShownStatus("warnAboutStateChange");
}

void UIMessageCenter::cannotStartMachine(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to start the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotStartMachine(const CProgress &progress)
{
    AssertWrapperOk(progress);
    CConsole console(CProgress(progress).GetInitiator());
    AssertWrapperOk(console);

    message(
        mainWindowShown(),
        Error,
        tr("Failed to start the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(progress.GetErrorInfo())
    );
}

void UIMessageCenter::cannotPauseMachine(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to pause the execution of the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotResumeMachine(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to resume the execution of the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotACPIShutdownMachine(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to send the ACPI Power Button press event to the "
            "virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotSaveMachineState(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to save the state of the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotSaveMachineState(const CProgress &progress)
{
    AssertWrapperOk(progress);
    CConsole console(CProgress(progress).GetInitiator());
    AssertWrapperOk(console);

    message(
        mainWindowShown(),
        Error,
        tr("Failed to save the state of the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(progress.GetErrorInfo())
    );
}

void UIMessageCenter::cannotCreateClone(const CMachine &machine,
                                        QWidget *pParent /* = 0 */)
{
    message(
        pParent ? pParent : mainWindowShown(),
        Error,
        tr("Failed to clone the virtual machine <b>%1</b>.")
            .arg(machine.GetName()),
        formatErrorInfo(machine)
    );
}

void UIMessageCenter::cannotCreateClone(const CMachine &machine,
                                        const CProgress &progress,
                                        QWidget *pParent /* = 0 */)
{
    AssertWrapperOk(progress);

    message(pParent ? pParent : mainWindowShown(),
        Error,
        tr("Failed to clone the virtual machine <b>%1</b>.")
            .arg(machine.GetName()),
        formatErrorInfo(progress.GetErrorInfo())
    );
}

void UIMessageCenter::cannotTakeSnapshot(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to create a snapshot of the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotTakeSnapshot(const CProgress &progress)
{
    AssertWrapperOk(progress);
    CConsole console(CProgress(progress).GetInitiator());
    AssertWrapperOk(console);

    message(
        mainWindowShown(),
        Error,
        tr("Failed to create a snapshot of the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(progress.GetErrorInfo())
    );
}

void UIMessageCenter::cannotStopMachine(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to stop the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotStopMachine(const CProgress &progress)
{
    AssertWrapperOk(progress);
    CConsole console(CProgress(progress).GetInitiator());
    AssertWrapperOk(console);

    message(mainWindowShown(), Error,
        tr("Failed to stop the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotDeleteMachine(const CMachine &machine)
{
    /* preserve the current error info before calling the object again */
    COMResult res(machine);

    message(mainWindowShown(),
            Error,
            tr("Failed to remove the virtual machine <b>%1</b>.").arg(machine.GetName()),
            !machine.isOk() ? formatErrorInfo(machine) : formatErrorInfo(res));
}

void UIMessageCenter::cannotDeleteMachine(const CMachine &machine, const CProgress &progress)
{
    message(mainWindowShown(),
            Error,
            tr("Failed to remove the virtual machine <b>%1</b>.").arg(machine.GetName()),
            formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotDiscardSavedState(const CConsole &console)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainWindowShown(), Error,
        tr("Failed to discard the saved state of the virtual machine <b>%1</b>.")
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotSendACPIToMachine()
{
    message(mainWindowShown(),  Warning,
        tr("You are trying to shut down the guest with the ACPI power "
            "button. This is currently not possible because the guest "
            "does not support software shutdown."));
}

bool UIMessageCenter::warnAboutVirtNotEnabled64BitsGuest(bool fHWVirtExSupported)
{
    if (fHWVirtExSupported)
        return messageOkCancel(mainWindowShown(), Error,
            tr("<p>VT-x/AMD-V hardware acceleration has been enabled, but is "
                "not operational. Your 64-bit guest will fail to detect a "
                "64-bit CPU and will not be able to boot.</p><p>Please ensure "
                "that you have enabled VT-x/AMD-V properly in the BIOS of your "
                "host computer.</p>"),
            0 /* pcszAutoConfirmId */,
            tr("Close VM"), tr("Continue"));
    else
        return messageOkCancel(mainWindowShown(), Error,
            tr("<p>VT-x/AMD-V hardware acceleration is not available on your system. "
                "Your 64-bit guest will fail to detect a 64-bit CPU and will "
                "not be able to boot."),
            0 /* pcszAutoConfirmId */,
            tr("Close VM"), tr("Continue"));
}

bool UIMessageCenter::warnAboutVirtNotEnabledGuestRequired(bool fHWVirtExSupported)
{
    if (fHWVirtExSupported)
        return messageOkCancel(mainWindowShown(), Error,
            tr("<p>VT-x/AMD-V hardware acceleration has been enabled, but is "
                "not operational. Certain guests (e.g. OS/2 and QNX) require "
                "this feature.</p><p>Please ensure "
                "that you have enabled VT-x/AMD-V properly in the BIOS of your "
                "host computer.</p>"),
            0 /* pcszAutoConfirmId */,
            tr("Close VM"), tr("Continue"));
    else
        return messageOkCancel(mainWindowShown(), Error,
            tr("<p>VT-x/AMD-V hardware acceleration is not available on your system. "
                "Certain guests (e.g. OS/2 and QNX) require this feature and will "
                "fail to boot without it.</p>"),
            0 /* pcszAutoConfirmId */,
            tr("Close VM"), tr("Continue"));
}

int UIMessageCenter::askAboutSnapshotRestoring(const QString &strSnapshotName, bool fAlsoCreateNewSnapshot)
{
    return fAlsoCreateNewSnapshot ?
           messageWithOption(mainWindowShown(), Question,
                             tr("<p>You are about to restore snapshot <nobr><b>%1</b></nobr>.</p>"
                                "<p>You can create a snapshot of the current state of the virtual machine first by checking the box below; "
                                "if you do not do this the current state will be permanently lost. Do you wish to proceed?</p>")
                                .arg(strSnapshotName),
                             tr("Create a snapshot of the current machine state"),
                             !vboxGlobal().virtualBox().GetExtraDataStringList(GUI_InvertMessageOption).contains("askAboutSnapshotRestoring"),
                             QString::null /* details */,
                             QIMessageBox::Ok | QIMessageBox::Default,
                             QIMessageBox::Cancel | QIMessageBox::Escape,
                             0 /* 3rd button */,
                             tr("Restore"), tr("Cancel"), QString::null /* 3rd button text */) :
           message(mainWindowShown(), Question,
                   tr("<p>Are you sure you want to restore snapshot <nobr><b>%1</b></nobr>?</p>").arg(strSnapshotName),
                   0 /* auto-confirmation token */,
                   QIMessageBox::Ok | QIMessageBox::Default,
                   QIMessageBox::Cancel | QIMessageBox::Escape,
                   0 /* 3rd button */,
                   tr("Restore"), tr("Cancel"), QString::null /* 3rd button text */);
}

bool UIMessageCenter::askAboutSnapshotDeleting(const QString &strSnapshotName)
{
    return messageOkCancel(mainWindowShown(), Question,
        tr("<p>Deleting the snapshot will cause the state information saved in it to be lost, and disk data spread over "
            "several image files that VirtualBox has created together with the snapshot will be merged into one file. This can be a lengthy process, and the information "
            "in the snapshot cannot be recovered.</p></p>Are you sure you want to delete the selected snapshot <b>%1</b>?</p>")
            .arg(strSnapshotName),
        /* Do NOT allow this message to be disabled! */
        NULL /* pcszAutoConfirmId */,
        tr("Delete"), tr("Cancel"));
}

bool UIMessageCenter::askAboutSnapshotDeletingFreeSpace(const QString &strSnapshotName,
                                                        const QString &strTargetImageName,
                                                        const QString &strTargetImageMaxSize,
                                                        const QString &strTargetFileSystemFree)
{
    return messageOkCancel(mainWindowShown(), Question,
        tr("<p>Deleting the snapshot %1 will temporarily need more disk space. In the worst case the size of image %2 will grow by %3, "
            "however on this filesystem there is only %4 free.</p><p>Running out of disk space during the merge operation can result in "
            "corruption of the image and the VM configuration, i.e. loss of the VM and its data.</p><p>You may continue with deleting "
            "the snapshot at your own risk.</p>")
            .arg(strSnapshotName)
            .arg(strTargetImageName)
            .arg(strTargetImageMaxSize)
            .arg(strTargetFileSystemFree),
        /* Do NOT allow this message to be disabled! */
        NULL /* pcszAutoConfirmId */,
        tr("Delete"), tr("Cancel"));
}

void UIMessageCenter::cannotRestoreSnapshot(const CConsole &console,
                                            const QString &strSnapshotName)
{
    message(mainWindowShown(), Error,
        tr("Failed to restore the snapshot <b>%1</b> of the virtual machine <b>%2</b>.")
            .arg(strSnapshotName)
            .arg(CConsole(console).GetMachine().GetName()),
        formatErrorInfo(console));
}

void UIMessageCenter::cannotRestoreSnapshot(const CProgress &progress,
                                            const QString &strSnapshotName)
{
    CConsole console(CProgress(progress).GetInitiator());

    message(mainWindowShown(), Error,
        tr("Failed to restore the snapshot <b>%1</b> of the virtual machine <b>%2</b>.")
            .arg(strSnapshotName)
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotDeleteSnapshot(const CConsole &console,
                                           const QString &strSnapshotName)
{
    message(mainWindowShown(), Error,
        tr("Failed to delete the snapshot <b>%1</b> of the virtual machine <b>%2</b>.")
            .arg(strSnapshotName)
            .arg(CConsole(console).GetMachine().GetName()),
        formatErrorInfo(console));
}

void UIMessageCenter::cannotDeleteSnapshot(const CProgress &progress,
                                           const QString &strSnapshotName)
{
    CConsole console(CProgress(progress).GetInitiator());

    message(mainWindowShown(), Error,
        tr("Failed to delete the snapshot <b>%1</b> of the virtual machine <b>%2</b>.")
            .arg(strSnapshotName)
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotFindSnapshotByName(QWidget *pParent,
                                               const CMachine &machine,
                                               const QString &strName) const
{
    message(pParent ? pParent : mainWindowShown(), Error,
             tr("Can't find snapshot named <b>%1</b>.")
             .arg(strName),
             formatErrorInfo(machine)
    );
}

void UIMessageCenter::cannotFindMachineByName(const CVirtualBox &vbox,
                                              const QString &name)
{
    message(
        QApplication::desktop()->screen(QApplication::desktop()->primaryScreen()),
        Error,
        tr("There is no virtual machine named <b>%1</b>.")
            .arg(name),
        formatErrorInfo(vbox)
    );
}

void UIMessageCenter::cannotEnterSeamlessMode(ULONG /* uWidth */,
                                              ULONG /* uHeight */,
                                              ULONG /* uBpp */,
                                              ULONG64 uMinVRAM)
{
    message(mainMachineWindowShown(), Error,
             tr("<p>Could not enter seamless mode due to insufficient guest "
                  "video memory.</p>"
                  "<p>You should configure the virtual machine to have at "
                  "least <b>%1</b> of video memory.</p>")
             .arg(VBoxGlobal::formatSize(uMinVRAM)));
}

int UIMessageCenter::cannotEnterFullscreenMode(ULONG /* uWidth */,
                                               ULONG /* uHeight */,
                                               ULONG /* uBpp */,
                                               ULONG64 uMinVRAM)
{
    return message(mainMachineWindowShown(), Warning,
             tr("<p>Could not switch the guest display to fullscreen mode due "
                 "to insufficient guest video memory.</p>"
                 "<p>You should configure the virtual machine to have at "
                 "least <b>%1</b> of video memory.</p>"
                 "<p>Press <b>Ignore</b> to switch to fullscreen mode anyway "
                 "or press <b>Cancel</b> to cancel the operation.</p>")
             .arg(VBoxGlobal::formatSize(uMinVRAM)),
             0, /* pcszAutoConfirmId */
             QIMessageBox::Ignore | QIMessageBox::Default,
             QIMessageBox::Cancel | QIMessageBox::Escape);
}

bool UIMessageCenter::cannotStartWithoutNetworkIf(const QString &strMachineName,
                                                  const QString &strIfNames)
{
    return messageOkCancel(mainMachineWindowShown(), Error,
             tr("<p>Could not start the machine <b>%1</b> because the "
                "following physical network interfaces were not found:</p>"
                "<p><b>%2</b></p>"
                "<p>You can either change the machine's network "
                "settings or stop the machine.</p>")
             .arg(strMachineName)
             .arg(strIfNames),
             0, /* pcszAutoConfirmId */
             tr("Change Network Settings"),
             tr("Close Virtual Machine"));
}

void UIMessageCenter::cannotSwitchScreenInSeamless(quint64 uMinVRAM)
{
    message(mainMachineWindowShown(), Error,
            tr("<p>Could not change the guest screen to this host screen "
               "due to insufficient guest video memory.</p>"
               "<p>You should configure the virtual machine to have at "
               "least <b>%1</b> of video memory.</p>")
            .arg(VBoxGlobal::formatSize(uMinVRAM)));
}

int UIMessageCenter::cannotSwitchScreenInFullscreen(quint64 uMinVRAM)
{
    return message(mainMachineWindowShown(), Warning,
                   tr("<p>Could not change the guest screen to this host screen "
                      "due to insufficient guest video memory.</p>"
                      "<p>You should configure the virtual machine to have at "
                      "least <b>%1</b> of video memory.</p>"
                      "<p>Press <b>Ignore</b> to switch the screen anyway "
                      "or press <b>Cancel</b> to cancel the operation.</p>")
                   .arg(VBoxGlobal::formatSize(uMinVRAM)),
                   0, /* pcszAutoConfirmId */
                   QIMessageBox::Ignore | QIMessageBox::Default,
                   QIMessageBox::Cancel | QIMessageBox::Escape);
}

int UIMessageCenter::cannotEnterFullscreenMode()
{
    return message(mainMachineWindowShown(), Error,
             tr("<p>Can not switch the guest display to fullscreen mode. You "
                 "have more virtual screens configured than physical screens are "
                 "attached to your host.</p><p>Please either lower the virtual "
                 "screens in your VM configuration or attach additional screens "
                 "to your host.</p>"),
             0, /* pcszAutoConfirmId */
             QIMessageBox::Ok | QIMessageBox::Default);
}

int UIMessageCenter::cannotEnterSeamlessMode()
{
    return message(mainMachineWindowShown(), Error,
             tr("<p>Can not switch the guest display to seamless mode. You "
                 "have more virtual screens configured than physical screens are "
                 "attached to your host.</p><p>Please either lower the virtual "
                 "screens in your VM configuration or attach additional screens "
                 "to your host.</p>"),
             0, /* pcszAutoConfirmId */
             QIMessageBox::Ok | QIMessageBox::Default);
}

void UIMessageCenter::notifyAboutCollisionOnGroupRemovingCantBeResolved(const QString &strName, const QString &strGroupName)
{
    message(&vboxGlobal().selectorWnd(),
            Error,
            tr("<p>You are trying to move machine <nobr><b>%1</b></nobr> "
               "to group <nobr><b>%2</b></nobr> which already have sub-group <nobr><b>%1</b></nobr>.</p>"
               "<p>Please resolve this name-conflict and try again.</p>")
               .arg(strName, strGroupName),
            0, /* auto-confirm id */
            QIMessageBox::Ok | QIMessageBox::Default);
}

int UIMessageCenter::askAboutCollisionOnGroupRemoving(const QString &strName, const QString &strGroupName)
{
    return message(&vboxGlobal().selectorWnd(),
                   Question,
                   tr("<p>You are trying to move group <nobr><b>%1</b></nobr> "
                      "to group <nobr><b>%2</b></nobr> which already have another item with the same name.</p>"
                      "<p>Would you like to automatically rename it?</p>")
                      .arg(strName, strGroupName),
                   0, /* auto-confirm id */
                   QIMessageBox::Ok,
                   QIMessageBox::Cancel | QIMessageBox::Escape | QIMessageBox::Default,
                   0,
                   tr("Rename"));
}

int UIMessageCenter::confirmMachineItemRemoval(const QStringList &names)
{
    return message(&vboxGlobal().selectorWnd(),
                   Question,
                   tr("<p>You are about to remove following virtual "
                      "machine items from the machine list:</p>"
                      "<p><b>%1</b></p>"
                      "<p>Do you wish to proceed?</p>").arg(names.join(", ")),
                   0, /* auto-confirm id */
                   QIMessageBox::Ok,
                   QIMessageBox::Cancel | QIMessageBox::Escape | QIMessageBox::Default,
                   0,
                   tr("Remove"));
}

int UIMessageCenter::confirmMachineDeletion(const QList<CMachine> &machines)
{
    /* Enumerate VMs: */
    int cInacessibleVMCount = 0;
    bool fVMWithHDPresent = false;
    QString strVMNames;
    for (int i = 0; i < machines.size(); ++i)
    {
        /* Get iterated VM: */
        const CMachine &machine = machines[i];
        /* Prepare VM name: */
        QString strMachineName;
        if (machine.GetAccessible())
        {
            /* Get VM name: */
            strMachineName = machine.GetName();
            /* Enumerate attachments: */
            const CMediumAttachmentVector &attachments = machine.GetMediumAttachments();
            for (int i = 0; !fVMWithHDPresent && i < attachments.size(); ++i)
            {
                /* Get current attachment: */
                const CMediumAttachment &attachment = attachments.at(i);
                /* Check if the medium is a hard disk: */
                if (attachment.GetType() == KDeviceType_HardDisk)
                {
                    /* Check if that hard disk isn't shared.
                     * If hard disk is shared, it will *never* be deleted: */
                    QVector<QString> ids = attachment.GetMedium().GetMachineIds();
                    if (ids.size() == 1)
                    {
                        fVMWithHDPresent = true;
                        break;
                    }
                }
            }
        }
        else
        {
            /* Get VM name: */
            QFileInfo fi(machine.GetSettingsFilePath());
            strMachineName = VBoxGlobal::hasAllowedExtension(fi.completeSuffix(), VBoxFileExts) ? fi.completeBaseName() : fi.fileName();
            /* Increment inacessible VM count: */
            ++cInacessibleVMCount;
        }

        /* Compose VM name list: */
        strVMNames += QString(strVMNames.isEmpty() ? "<b>%1</b>" : ", <b>%1</b>").arg(strMachineName);
    }

    /* Prepare message text: */
    QString strText = cInacessibleVMCount == machines.size() ?
                      tr("<p>You are about to remove following inaccessible virtual machines from the machine list:</p>"
                         "<p>%1</p>"
                         "<p>Do you wish to proceed?</p>")
                         .arg(strVMNames) :
                      fVMWithHDPresent ?
                      tr("<p>You are about to remove following virtual machines from the machine list:</p>"
                         "<p>%1</p>"
                         "<p>Would you like to delete the files containing the virtual machine from your hard disk as well? "
                         "Doing this will also remove the files containing the machine's virtual hard disks "
                         "if they are not in use by another machine.</p>")
                         .arg(strVMNames) :
                      tr("<p>You are about to remove following virtual machines from the machine list:</p>"
                         "<p>%1</p>"
                         "<p>Would you like to delete the files containing the virtual machine from your hard disk as well?</p>")
                         .arg(strVMNames);

    /* Prepare message itself: */
    return cInacessibleVMCount == machines.size() ?
           message(&vboxGlobal().selectorWnd(),
                   Question,
                   strText,
                   0, /* auto-confirm id */
                   QIMessageBox::Ok,
                   QIMessageBox::Cancel | QIMessageBox::Escape | QIMessageBox::Default,
                   0,
                   tr("Remove")) :
           message(&vboxGlobal().selectorWnd(),
                   Question,
                   strText,
                   0, /* auto-confirm id */
                   QIMessageBox::Yes,
                   QIMessageBox::No,
                   QIMessageBox::Cancel | QIMessageBox::Escape | QIMessageBox::Default,
                   tr("Delete all files"),
                   tr("Remove only"));
}

bool UIMessageCenter::confirmDiscardSavedState(const QString &strNames)
{
    return messageOkCancel(&vboxGlobal().selectorWnd(), Question,
        tr("<p>Are you sure you want to discard the saved state of "
           "the following virtual machines?</p><p><b>%1</b></p>"
           "<p>This operation is equivalent to resetting or powering off "
           "the machine without doing a proper shutdown of the guest OS.</p>")
           .arg(strNames),
        0 /* pcszAutoConfirmId */,
        tr("Discard", "saved state"));
}

void UIMessageCenter::cannotSetGroups(const CMachine &machine)
{
    COMResult res(machine);
    QString name = machine.GetName();
    if (name.isEmpty())
        name = QFileInfo(machine.GetSettingsFilePath()).baseName();

    message(mainWindowShown(), Error,
            tr("Failed to set groups of the virtual machine <b>%1</b>.").arg(name),
            formatErrorInfo(res));
}

void UIMessageCenter::cannotChangeMediumType(QWidget *pParent,
                                             const CMedium &medium,
                                             KMediumType oldMediumType,
                                             KMediumType newMediumType)
{
    message(pParent ? pParent : mainWindowShown(), Error,
            tr("<p>Error changing medium type from <b>%1</b> to <b>%2</b>.</p>")
                .arg(gpConverter->toString(oldMediumType)).arg(gpConverter->toString(newMediumType)),
            formatErrorInfo(medium));
}

bool UIMessageCenter::confirmReleaseMedium(QWidget *pParent,
                                           const UIMedium &aMedium,
                                           const QString &strUsage)
{
    /** @todo (translation-related): the gender of "the" in translations
     * will depend on the gender of aMedium.type(). */
    return messageOkCancel(pParent, Question,
        tr("<p>Are you sure you want to release the %1 "
            "<nobr><b>%2</b></nobr>?</p>"
            "<p>This will detach it from the "
            "following virtual machine(s): <b>%3</b>.</p>")
            .arg(mediumToAccusative(aMedium.type()))
            .arg(aMedium.location())
            .arg(strUsage),
        0 /* pcszAutoConfirmId */,
        tr("Release", "detach medium"));
}

bool UIMessageCenter::confirmRemoveMedium(QWidget *pParent,
                                          const UIMedium &aMedium)
{
    /** @todo (translation-related): the gender of "the" in translations
     * will depend on the gender of aMedium.type(). */
    QString msg =
        tr("<p>Are you sure you want to remove the %1 "
           "<nobr><b>%2</b></nobr> from the list of known media?</p>")
            .arg(mediumToAccusative(aMedium.type()))
            .arg(aMedium.location());

    qulonglong caps = 0;
    QVector<KMediumFormatCapabilities> capabilities;
    capabilities = aMedium.medium().GetMediumFormat().GetCapabilities();
    for (int i = 0; i < capabilities.size(); i++)
        caps |= capabilities[i];

    if (aMedium.type() == UIMediumType_HardDisk &&
        caps & MediumFormatCapabilities_File)
    {
        if (aMedium.state() == KMediumState_Inaccessible)
            msg +=
                tr("Note that as this hard disk is inaccessible its "
                   "storage unit cannot be deleted right now.");
        else
            msg +=
                tr("The next dialog will let you choose whether you also "
                   "want to delete the storage unit of this hard disk or "
                   "keep it for later usage.");
    }
    else
        msg +=
            tr("<p>Note that the storage unit of this medium will not be "
               "deleted and that it will be possible to use it later again.</p>");

    return messageOkCancel(pParent, Question, msg,
        "confirmRemoveMedium", /* pcszAutoConfirmId */
        tr("Remove", "medium"));
}

void UIMessageCenter::sayCannotOverwriteHardDiskStorage(QWidget *pParent,
                                                        const QString &strLocation)
{
    message(pParent, Info,
        tr("<p>The hard disk storage unit at location <b>%1</b> already "
           "exists. You cannot create a new virtual hard disk that uses this "
           "location because it can be already used by another virtual hard "
           "disk.</p>"
           "<p>Please specify a different location.</p>")
        .arg(strLocation));
}

int UIMessageCenter::confirmDeleteHardDiskStorage(QWidget *pParent, const QString &strLocation)
{
    return message(pParent, Question,
        tr("<p>Do you want to delete the storage unit of the hard disk "
           "<nobr><b>%1</b></nobr>?</p>"
           "<p>If you select <b>Delete</b> then the specified storage unit "
           "will be permanently deleted. This operation <b>cannot be "
           "undone</b>.</p>"
           "<p>If you select <b>Keep</b> then the hard disk will be only "
           "removed from the list of known hard disks, but the storage unit "
           "will be left untouched which makes it possible to add this hard "
           "disk to the list later again.</p>")
        .arg(strLocation),
        0, /* pcszAutoConfirmId */
        QIMessageBox::Yes,
        QIMessageBox::No | QIMessageBox::Default,
        QIMessageBox::Cancel | QIMessageBox::Escape,
        tr("Delete", "hard disk storage"),
        tr("Keep", "hard disk storage"));
}

void UIMessageCenter::cannotDeleteHardDiskStorage(QWidget *pParent,
                                                  const CMedium &medium,
                                                  const CProgress &progress)
{
    /* below, we use CMedium (medium) to preserve current error info
     * for formatErrorInfo() */

    message(pParent, Error,
        tr("Failed to delete the storage unit of the hard disk <b>%1</b>.")
        .arg(CMedium(medium).GetLocation()),
        !medium.isOk() ? formatErrorInfo(medium) :
        !progress.isOk() ? formatErrorInfo(progress) :
        formatErrorInfo(progress.GetErrorInfo()));
}

int UIMessageCenter::askAboutHardDiskAttachmentCreation(QWidget *pParent,
                                                        const QString &strControllerName)
{
    return message(pParent, Question,
                   tr("<p>You are about to add a virtual hard disk to controller <b>%1</b>.</p>"
                      "<p>Would you like to create a new, empty file to hold the disk contents or select an existing one?</p>")
                   .arg(strControllerName),
                   0, /* pcszAutoConfirmId */
                   QIMessageBox::Yes,
                   QIMessageBox::No,
                   QIMessageBox::Cancel | QIMessageBox::Default | QIMessageBox::Escape,
                   tr("Create &new disk", "add attachment routine"),
                   tr("&Choose existing disk", "add attachment routine"));
}

int UIMessageCenter::askAboutOpticalAttachmentCreation(QWidget *pParent,
                                                       const QString &strControllerName)
{
    return message(pParent, Question,
                   tr("<p>You are about to add a new CD/DVD drive to controller <b>%1</b>.</p>"
                      "<p>Would you like to choose a virtual CD/DVD disk to put in the drive "
                      "or to leave it empty for now?</p>")
                   .arg(strControllerName),
                   0, /* pcszAutoConfirmId */
                   QIMessageBox::Yes,
                   QIMessageBox::No,
                   QIMessageBox::Cancel | QIMessageBox::Default | QIMessageBox::Escape,
                   tr("&Choose disk", "add attachment routine"),
                   tr("Leave &empty", "add attachment routine"));
}

int UIMessageCenter::askAboutFloppyAttachmentCreation(QWidget *pParent,
                                                      const QString &strControllerName)
{
    return message(pParent, Question,
                   tr("<p>You are about to add a new floppy drive to controller <b>%1</b>.</p>"
                      "<p>Would you like to choose a virtual floppy disk to put in the drive "
                      "or to leave it empty for now?</p>")
                   .arg(strControllerName),
                   0, /* pcszAutoConfirmId */
                   QIMessageBox::Yes,
                   QIMessageBox::No,
                   QIMessageBox::Cancel | QIMessageBox::Default | QIMessageBox::Escape,
                   tr("&Choose disk", "add attachment routine"),
                   tr("Leave &empty", "add attachment routine"));
}

int UIMessageCenter::confirmRemovingOfLastDVDDevice() const
{
    return messageOkCancel(QApplication::activeWindow(), Info,
                            tr("<p>Are you sure you want to delete the CD/DVD-ROM device?</p>"
                               "<p>You will not be able to mount any CDs or ISO images "
                               "or install the Guest Additions without it!</p>"),
                            0, /* pcszAutoConfirmId */
                            tr("&Remove", "medium"));
}

void UIMessageCenter::cannotCreateHardDiskStorage(QWidget *pParent,
                                                  const CVirtualBox &vbox,
                                                  const QString &strLocation,
                                                  const CMedium &medium,
                                                  const CProgress &progress)
{
    message(pParent, Error,
        tr("Failed to create the hard disk storage <nobr><b>%1</b>.</nobr>")
        .arg(strLocation),
        !vbox.isOk() ? formatErrorInfo(vbox) :
        !medium.isOk() ? formatErrorInfo(medium) :
        !progress.isOk() ? formatErrorInfo(progress) :
        formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotDetachDevice(QWidget *pParent,
                                         const CMachine &machine,
                                         UIMediumType type,
                                         const QString &strLocation,
                                         const StorageSlot &storageSlot)
{
    QString strMessage;
    switch (type)
    {
        case UIMediumType_HardDisk:
        {
            strMessage = tr("Failed to detach the hard disk (<nobr><b>%1</b></nobr>) from the slot <i>%2</i> of the machine <b>%3</b>.")
                           .arg(strLocation).arg(gpConverter->toString(storageSlot)).arg(CMachine(machine).GetName());
            break;
        }
        case UIMediumType_DVD:
        {
            strMessage = tr("Failed to detach the CD/DVD device (<nobr><b>%1</b></nobr>) from the slot <i>%2</i> of the machine <b>%3</b>.")
                           .arg(strLocation).arg(gpConverter->toString(storageSlot)).arg(CMachine(machine).GetName());
            break;
        }
        case UIMediumType_Floppy:
        {
            strMessage = tr("Failed to detach the floppy device (<nobr><b>%1</b></nobr>) from the slot <i>%2</i> of the machine <b>%3</b>.")
                           .arg(strLocation).arg(gpConverter->toString(storageSlot)).arg(CMachine(machine).GetName());
            break;
        }
        default:
            break;
    }
    message(pParent ? pParent : mainWindowShown(), Error, strMessage, formatErrorInfo(machine));
}

int UIMessageCenter::cannotRemountMedium(QWidget *pParent,
                                         const CMachine &machine,
                                         const UIMedium &aMedium,
                                         bool fMount,
                                         bool fRetry)
{
    /** @todo (translation-related): the gender of "the" in translations
     * will depend on the gender of aMedium.type(). */
    QString text;
    if (fMount)
    {
        text = tr("Unable to mount the %1 <nobr><b>%2</b></nobr> on the machine <b>%3</b>.");
        if (fRetry) text += tr(" Would you like to force mounting of this medium?");
    }
    else
    {
        text = tr("Unable to unmount the %1 <nobr><b>%2</b></nobr> from the machine <b>%3</b>.");
        if (fRetry) text += tr(" Would you like to force unmounting of this medium?");
    }
    if (fRetry)
    {
        return messageOkCancel(pParent ? pParent : mainWindowShown(), Question, text
            .arg(mediumToAccusative(aMedium.type(), aMedium.isHostDrive()))
            .arg(aMedium.isHostDrive() ? aMedium.name() : aMedium.location())
            .arg(CMachine(machine).GetName()),
            formatErrorInfo(machine),
            0 /* Auto Confirm ID */,
            tr("Force Unmount"));
    }
    else
    {
        return message(pParent ? pParent : mainWindowShown(), Error, text
            .arg(mediumToAccusative(aMedium.type(), aMedium.isHostDrive()))
            .arg(aMedium.isHostDrive() ? aMedium.name() : aMedium.location())
            .arg(CMachine(machine).GetName()),
            formatErrorInfo(machine));
    }
}

void UIMessageCenter::cannotOpenMedium(QWidget *pParent,
                                       const CVirtualBox &vbox,
                                       UIMediumType type,
                                       const QString &strLocation)
{
    /** @todo (translation-related): the gender of "the" in translations
     * will depend on the gender of aMedium.type(). */
    message(pParent ? pParent : mainWindowShown(), Error,
        tr("Failed to open the %1 <nobr><b>%2</b></nobr>.")
            .arg(mediumToAccusative(type))
            .arg(strLocation),
        formatErrorInfo(vbox));
}

void UIMessageCenter::cannotCloseMedium(QWidget *pParent,
                                        const UIMedium &aMedium,
                                        const COMResult &rc)
{
    /** @todo (translation-related): the gender of "the" in translations
     * will depend on the gender of aMedium.type(). */
    message(pParent, Error,
        tr("Failed to close the %1 <nobr><b>%2</b></nobr>.")
            .arg(mediumToAccusative(aMedium.type()))
            .arg(aMedium.location()),
        formatErrorInfo(rc));
}

void UIMessageCenter::cannotOpenSession(const CSession &session)
{
    Assert(session.isNull());

    message(
        mainWindowShown(),
        Error,
        tr("Failed to create a new session."),
        formatErrorInfo(session)
    );
}

void UIMessageCenter::cannotOpenSession(const CVirtualBox &vbox,
                                        const CMachine &machine,
                                        const CProgress &progress)
{
    Assert(!vbox.isOk() || progress.isOk());

    QString name = machine.GetName();
    if (name.isEmpty())
        name = QFileInfo(machine.GetSettingsFilePath()).baseName();

    message(
        mainWindowShown(),
        Error,
        tr("Failed to open a session for the virtual machine <b>%1</b>.")
            .arg(name),
        !vbox.isOk() ? formatErrorInfo(vbox) :
                       formatErrorInfo(progress.GetErrorInfo())
    );
}

void UIMessageCenter::cannotOpenSession(const CMachine &machine)
{
    COMResult res(machine);
    QString name = machine.GetName();
    if (name.isEmpty())
        name = QFileInfo(machine.GetSettingsFilePath()).baseName();

    message(mainWindowShown(), Error,
            tr("Failed to open a session for the virtual machine <b>%1</b>.").arg(name),
            formatErrorInfo(res));
}

void UIMessageCenter::cannotGetMediaAccessibility(const UIMedium &aMedium)
{
    message(qApp->activeWindow(), Error,
        tr("Failed to determine the accessibility state of the medium "
            "<nobr><b>%1</b></nobr>.")
            .arg(aMedium.location()),
        formatErrorInfo(aMedium.result()));
}

int UIMessageCenter::confirmDeletingHostInterface(const QString &strName,
                                                  QWidget *pParent)
{
    return msgCenter().message(pParent, UIMessageCenter::Question,
        tr("<p>Deleting this host-only network will remove "
           "the host-only interface this network is based on. Do you want to "
           "remove the (host-only network) interface <nobr><b>%1</b>?</nobr></p>"
           "<p><b>Note:</b> this interface may be in use by one or more "
           "virtual network adapters belonging to one of your VMs. "
           "After it is removed, these adapters will no longer be usable until "
           "you correct their settings by either choosing a different interface "
           "name or a different adapter attachment type.</p>").arg(strName),
        0, /* pcszAutoConfirmId */
        QIMessageBox::Ok | QIMessageBox::Default,
        QIMessageBox::Cancel | QIMessageBox::Escape);
}

void UIMessageCenter::cannotAttachUSBDevice(const CConsole &console,
                                            const QString &device)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainMachineWindowShown(), Error,
        tr("Failed to attach the USB device <b>%1</b> "
           "to the virtual machine <b>%2</b>.")
            .arg(device)
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotAttachUSBDevice(const CConsole &console,
                                            const QString &device,
                                            const CVirtualBoxErrorInfo &error)
{
    message(mainMachineWindowShown(), Error,
        tr("Failed to attach the USB device <b>%1</b> "
           "to the virtual machine <b>%2</b>.")
            .arg(device)
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(error));
}

void UIMessageCenter::cannotDetachUSBDevice(const CConsole &console,
                                            const QString &device)
{
    /* preserve the current error info before calling the object again */
    COMResult res(console);

    message(mainMachineWindowShown(), Error,
        tr("Failed to detach the USB device <b>%1</b> "
           "from the virtual machine <b>%2</b>.")
            .arg(device)
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(res));
}

void UIMessageCenter::cannotDetachUSBDevice(const CConsole &console,
                                            const QString &device,
                                            const CVirtualBoxErrorInfo &error)
{
    message(mainMachineWindowShown(), Error,
        tr("Failed to detach the USB device <b>%1</b> "
           "from the virtual machine <b>%2</b>.")
            .arg(device)
            .arg(console.GetMachine().GetName()),
        formatErrorInfo(error));
}

void UIMessageCenter::remindAboutGuestAdditionsAreNotActive(QWidget *pParent)
{
    message(pParent, Warning,
             tr("<p>The VirtualBox Guest Additions do not appear to be "
                "available on this virtual machine, and shared folders "
                "cannot be used without them. To use shared folders inside "
                "the virtual machine, please install the Guest Additions "
                "if they are not installed, or re-install them if they are "
                "not working correctly, by selecting <b>Install Guest Additions</b> "
                "from the <b>Devices</b> menu. "
                "If they are installed but the machine is not yet fully started "
                "then shared folders will be available once it is.</p>"),
             "remindAboutGuestAdditionsAreNotActive");
}

bool UIMessageCenter::cannotFindGuestAdditions()
{
    return messageYesNo(mainMachineWindowShown(), Question,
                    tr("<p>Could not find the VirtualBox Guest Additions "
                       "CD image file.</nobr></p><p>Do you wish to "
                       "download this CD image from the Internet?</p>"));
}

void UIMessageCenter::cannotMountGuestAdditions(const QString &strMachineName)
{
    message(mainMachineWindowShown(), Error,
             tr("<p>Could not insert the VirtualBox Guest Additions "
                "installer CD image into the virtual machine <b>%1</b>, as the machine "
                "has no CD/DVD-ROM drives. Please add a drive using the "
                "storage page of the virtual machine settings dialog.</p>")
                 .arg(strMachineName));
}

bool UIMessageCenter::confirmDownloadAdditions(const QString &strUrl, qulonglong uSize)
{
    QLocale loc(VBoxGlobal::languageId());
    return messageOkCancel(networkManagerOrMainMachineWindowShown(), Question,
                           tr("<p>Are you sure you want to download the VirtualBox "
                              "Guest Additions CD image from "
                              "<nobr><a href=\"%1\">%2</a></nobr> "
                              "(size %3 bytes)?</p>").arg(strUrl).arg(strUrl).arg(loc.toString(uSize)),
                           0, /* pcszAutoConfirmId */
                           tr("Download", "additions"));
}

bool UIMessageCenter::confirmMountAdditions(const QString &strUrl, const QString &strSrc)
{
    return messageOkCancel(networkManagerOrMainMachineWindowShown(), Question,
                           tr("<p>The VirtualBox Guest Additions CD image has been "
                              "successfully downloaded from "
                              "<nobr><a href=\"%1\">%2</a></nobr> "
                              "and saved locally as <nobr><b>%3</b>.</nobr></p>"
                              "<p>Do you wish to register this CD image and mount it "
                              "on the virtual CD/DVD drive?</p>")
                               .arg(strUrl).arg(strUrl).arg(strSrc),
                           0, /* pcszAutoConfirmId */
                           tr("Mount", "additions"));
}

void UIMessageCenter::warnAboutAdditionsCantBeSaved(const QString &strTarget)
{
    message(networkManagerOrMainMachineWindowShown(), Error,
            tr("<p>Failed to save the downloaded file as <nobr><b>%1</b>.</nobr></p>")
               .arg(QDir::toNativeSeparators(strTarget)));
}

bool UIMessageCenter::askAboutUserManualDownload(const QString &strMissedLocation)
{
    return messageOkCancel(mainWindowShown(), Question,
                           tr("<p>Could not find the VirtualBox User Manual "
                              "<nobr><b>%1</b>.</nobr></p><p>Do you wish to "
                              "download this file from the Internet?</p>")
                              .arg(strMissedLocation),
                           0, /* Auto-confirm Id */
                           tr("Download", "additions"));
}

bool UIMessageCenter::confirmUserManualDownload(const QString &strURL, qulonglong uSize)
{
    QLocale loc(VBoxGlobal::languageId());
    return messageOkCancel(networkManagerOrMainWindowShown(), Question,
                           tr("<p>Are you sure you want to download the VirtualBox "
                              "User Manual from "
                              "<nobr><a href=\"%1\">%2</a></nobr> "
                              "(size %3 bytes)?</p>").arg(strURL).arg(strURL).arg(loc.toString(uSize)),
                           0, /* Auto-confirm Id */
                           tr("Download", "additions"));
}

void UIMessageCenter::warnAboutUserManualDownloaded(const QString &strURL, const QString &strTarget)
{
    message(networkManagerOrMainWindowShown(), Warning,
            tr("<p>The VirtualBox User Manual has been "
               "successfully downloaded from "
               "<nobr><a href=\"%1\">%2</a></nobr> "
               "and saved locally as <nobr><b>%3</b>.</nobr></p>")
               .arg(strURL).arg(strURL).arg(strTarget));
}

void UIMessageCenter::warnAboutUserManualCantBeSaved(const QString &strURL, const QString &strTarget)
{
    message(networkManagerOrMainWindowShown(), Error,
            tr("<p>The VirtualBox User Manual has been "
               "successfully downloaded from "
               "<nobr><a href=\"%1\">%2</a></nobr> "
               "but can't be saved locally as <nobr><b>%3</b>.</nobr></p>"
               "<p>Please choose another location for that file.</p>")
               .arg(strURL).arg(strURL).arg(strTarget));
}

bool UIMessageCenter::proposeDownloadExtensionPack(const QString &strExtPackName, const QString &strExtPackVersion)
{
    return messageOkCancel(mainWindowShown(),
                           Question,
                           tr("<p>You have an old version (%1) of the <b><nobr>%2</nobr></b> installed.</p>"
                              "<p>Do you wish to download latest one from the Internet?</p>")
                              .arg(strExtPackVersion).arg(strExtPackName),
                           0, /* Auto-confirm Id */
                           tr("Download", "extension pack"));
}

bool UIMessageCenter::requestUserDownloadExtensionPack(const QString &strExtPackName, const QString &strExtPackVersion, const QString &strVBoxVersion)
{
    return message(mainWindowShown(), Info,
                   tr("<p>You have version %1 of the <b><nobr>%2</nobr></b> installed.</p>"
                      "<p>You should download and install version %3 of this extension pack from Oracle!</p>")
                      .arg(strExtPackVersion).arg(strExtPackName).arg(strVBoxVersion),
                      0, /* Auto-confirm Id */
                      QIMessageBox::Ok | QIMessageBox::Default,
                      0,
                      0,
                      tr("Ok", "extension pack"));
}

bool UIMessageCenter::confirmDownloadExtensionPack(const QString &strExtPackName, const QString &strURL, qulonglong uSize)
{
    QLocale loc(VBoxGlobal::languageId());
    return messageOkCancel(networkManagerOrMainWindowShown(), Question,
                           tr("<p>Are you sure you want to download the <b><nobr>%1</nobr></b> "
                              "from <nobr><a href=\"%2\">%2</a></nobr> (size %3 bytes)?</p>")
                              .arg(strExtPackName, strURL, loc.toString(uSize)),
                           0, /* Auto-confirm Id */
                           tr("Download", "extension pack"));
}

bool UIMessageCenter::proposeInstallExtentionPack(const QString &strExtPackName, const QString &strFrom, const QString &strTo)
{
    return messageOkCancel(networkManagerOrMainWindowShown(), Question,
                           tr("<p>The <b><nobr>%1</nobr></b> has been "
                              "successfully downloaded from <nobr><a href=\"%2\">%2</a></nobr> "
                              "and saved locally as <nobr><b>%3</b>.</nobr></p>"
                              "<p>Do you wish to install this extension pack?</p>")
                              .arg(strExtPackName, strFrom, strTo),
                           0, /* Auto-confirm Id */
                           tr ("Install", "extension pack"));
}

void UIMessageCenter::warnAboutExtentionPackCantBeSaved(const QString &strExtPackName, const QString &strFrom, const QString &strTo)
{
    message(networkManagerOrMainWindowShown(), Error,
            tr("<p>The <b><nobr>%1</nobr></b> has been "
               "successfully downloaded from <nobr><a href=\"%2\">%2</a></nobr> "
               "but can't be saved locally as <nobr><b>%3</b>.</nobr></p>"
               "<p>Please choose another location for that file.</p>")
               .arg(strExtPackName, strFrom, strTo));
}

void UIMessageCenter::showUpdateSuccess(const QString &strVersion, const QString &strLink)
{
    message(networkManagerOrMainWindowShown(), Info,
            tr("<p>A new version of VirtualBox has been released! Version <b>%1</b> is available at <a href=\"http://www.virtualbox.org/\">virtualbox.org</a>.</p>"
               "<p>You can download this version using the link:</p>"
               "<p><a href=%2>%3</a></p>")
            .arg(strVersion, strLink, strLink));
}

void UIMessageCenter::showUpdateNotFound()
{
    message(networkManagerOrMainWindowShown(), Info,
            tr("You are already running the most recent version of VirtualBox."));
}

bool UIMessageCenter::askAboutCancelAllNetworkRequest(QWidget *pParent)
{
    return messageOkCancel(pParent, Question, tr("Do you wish to cancel all current network operations?"));
}

/**
 *  @return @c true if the user has confirmed input capture (this is always
 *  the case if the dialog was autoconfirmed). @a pfAutoConfirmed, when not
 *  NULL, will receive @c true if the dialog wasn't actually shown.
 */
bool UIMessageCenter::confirmInputCapture(bool *pfAutoConfirmed /* = NULL */)
{
    int rc = message(mainMachineWindowShown(), Info,
        tr("<p>You have <b>clicked the mouse</b> inside the Virtual Machine display "
           "or pressed the <b>host key</b>. This will cause the Virtual Machine to "
           "<b>capture</b> the host mouse pointer (only if the mouse pointer "
           "integration is not currently supported by the guest OS) and the "
           "keyboard, which will make them unavailable to other applications "
           "running on your host machine."
           "</p>"
           "<p>You can press the <b>host key</b> at any time to <b>uncapture</b> the "
           "keyboard and mouse (if it is captured) and return them to normal "
           "operation. The currently assigned host key is shown on the status bar "
           "at the bottom of the Virtual Machine window, next to the&nbsp;"
           "<img src=:/hostkey_16px.png/>&nbsp;icon. This icon, together "
           "with the mouse icon placed nearby, indicate the current keyboard "
           "and mouse capture state."
           "</p>") +
        tr("<p>The host key is currently defined as <b>%1</b>.</p>",
           "additional message box paragraph")
            .arg(UIHotKeyCombination::toReadableString(vboxGlobal().settings().hostCombo())),
        "confirmInputCapture",
        QIMessageBox::Ok | QIMessageBox::Default,
        QIMessageBox::Cancel | QIMessageBox::Escape,
        0,
        tr("Capture", "do input capture"));

    if (pfAutoConfirmed)
        *pfAutoConfirmed = (rc & AutoConfirmed);

    return (rc & QIMessageBox::ButtonMask) == QIMessageBox::Ok;
}

void UIMessageCenter::remindAboutAutoCapture()
{
    message(mainMachineWindowShown(), Info,
        tr("<p>You have the <b>Auto capture keyboard</b> option turned on. "
           "This will cause the Virtual Machine to automatically <b>capture</b> "
           "the keyboard every time the VM window is activated and make it "
           "unavailable to other applications running on your host machine: "
           "when the keyboard is captured, all keystrokes (including system ones "
           "like Alt-Tab) will be directed to the VM."
           "</p>"
           "<p>You can press the <b>host key</b> at any time to <b>uncapture</b> the "
           "keyboard and mouse (if it is captured) and return them to normal "
           "operation. The currently assigned host key is shown on the status bar "
           "at the bottom of the Virtual Machine window, next to the&nbsp;"
           "<img src=:/hostkey_16px.png/>&nbsp;icon. This icon, together "
           "with the mouse icon placed nearby, indicate the current keyboard "
           "and mouse capture state."
           "</p>") +
        tr("<p>The host key is currently defined as <b>%1</b>.</p>",
           "additional message box paragraph")
            .arg(UIHotKeyCombination::toReadableString(vboxGlobal().settings().hostCombo())),
        "remindAboutAutoCapture");
}

void UIMessageCenter::remindAboutMouseIntegration(bool fSupportsAbsolute)
{
    if (isAlreadyShown("remindAboutMouseIntegration"))
        return;
    setShownStatus("remindAboutMouseIntegration");

    static const char *kNames [2] =
    {
        "remindAboutMouseIntegrationOff",
        "remindAboutMouseIntegrationOn"
    };

    /* Close the previous (outdated) window if any. We use kName as
     * pcszAutoConfirmId which is also used as the widget name by default. */
    {
        QWidget *outdated =
            VBoxGlobal::findWidget(NULL, kNames [int (!fSupportsAbsolute)],
                                    "QIMessageBox");
        if (outdated)
            outdated->close();
    }

    if (fSupportsAbsolute)
    {
        message(mainMachineWindowShown(), Info,
            tr("<p>The Virtual Machine reports that the guest OS supports "
               "<b>mouse pointer integration</b>. This means that you do not "
               "need to <i>capture</i> the mouse pointer to be able to use it "
               "in your guest OS -- all "
               "mouse actions you perform when the mouse pointer is over the "
               "Virtual Machine's display are directly sent to the guest OS. "
               "If the mouse is currently captured, it will be automatically "
               "uncaptured."
               "</p>"
               "<p>The mouse icon on the status bar will look like&nbsp;"
               "<img src=:/mouse_seamless_16px.png/>&nbsp;to inform you that mouse "
               "pointer integration is supported by the guest OS and is "
               "currently turned on."
               "</p>"
               "<p><b>Note</b>: Some applications may behave incorrectly in "
               "mouse pointer integration mode. You can always disable it for "
               "the current session (and enable it again) by selecting the "
               "corresponding action from the menu bar."
               "</p>"),
            kNames [1] /* pcszAutoConfirmId */);
    }
    else
    {
        message(mainMachineWindowShown(), Info,
            tr("<p>The Virtual Machine reports that the guest OS does not "
               "support <b>mouse pointer integration</b> in the current video "
               "mode. You need to capture the mouse (by clicking over the VM "
               "display or pressing the host key) in order to use the "
               "mouse inside the guest OS.</p>"),
            kNames [0] /* pcszAutoConfirmId */);
    }

    clearShownStatus("remindAboutMouseIntegration");
}

/**
 * @return @c false if the dialog wasn't actually shown (i.e. it was
 * autoconfirmed).
 */
bool UIMessageCenter::remindAboutPausedVMInput()
{
    int rc = message(
        mainMachineWindowShown(),
        Info,
        tr("<p>The Virtual Machine is currently in the <b>Paused</b> state and "
           "not able to see any keyboard or mouse input. If you want to "
           "continue to work inside the VM, you need to resume it by selecting the "
           "corresponding action from the menu bar.</p>"),
        "remindAboutPausedVMInput"
    );
    return !(rc & AutoConfirmed);
}

/** @return true if the user has chosen to show the Disk Manager Window */
bool UIMessageCenter::remindAboutInaccessibleMedia()
{
    int rc = message(&vboxGlobal().selectorWnd(), Warning,
        tr("<p>One or more virtual hard disks, CD/DVD or "
           "floppy media are not currently accessible. As a result, you will "
           "not be able to operate virtual machines that use these media until "
           "they become accessible later.</p>"
           "<p>Press <b>Check</b> to open the Virtual Media Manager window and "
           "see what media are inaccessible, or press <b>Ignore</b> to "
           "ignore this message.</p>"),
        "remindAboutInaccessibleMedia",
        QIMessageBox::Ok | QIMessageBox::Default,
        QIMessageBox::Ignore | QIMessageBox::Escape,
        0,
        tr("Check", "inaccessible media message box"));

    return rc == QIMessageBox::Ok; /* implies !AutoConfirmed */
}

/**
 * Shows user a proposal to either convert configuration files or
 * Exit the application leaving all as already is.
 *
 * @param strFileList      List of files for auto-conversion (may use Qt HTML).
 * @param fAfterRefresh  @true when called after the VM refresh.
 *
 * @return QIMessageBox::Ok (Save + Backup), QIMessageBox::Cancel (Exit)
 */
int UIMessageCenter::warnAboutSettingsAutoConversion(const QString &strFileList,
                                                     bool fAfterRefresh)
{
    if (!fAfterRefresh)
    {
        /* Common variant for all VMs */
        return message(mainWindowShown(), Info,
            tr("<p>Your existing VirtualBox settings files will be automatically "
               "converted from the old format to a new format required by the "
               "new version of VirtualBox.</p>"
               "<p>Press <b>OK</b> to start VirtualBox now or press <b>Exit</b> if "
               "you want to terminate the VirtualBox "
               "application without any further actions.</p>"),
            NULL /* pcszAutoConfirmId */,
            QIMessageBox::Ok | QIMessageBox::Default,
            QIMessageBox::Cancel | QIMessageBox::Escape,
            0,
            0,
            tr("E&xit", "warnAboutSettingsAutoConversion message box"));
    }
    else
    {
        /* Particular VM variant */
        return message(mainWindowShown(), Info,
            tr("<p>The following VirtualBox settings files will be automatically "
               "converted from the old format to a new format required by the "
               "new version of VirtualBox.</p>"
               "<p>Press <b>OK</b> to start VirtualBox now or press <b>Exit</b> if "
               "you want to terminate the VirtualBox "
               "application without any further actions.</p>"),
            QString("<!--EOM-->%1").arg(strFileList),
            NULL /* pcszAutoConfirmId */,
            QIMessageBox::Ok | QIMessageBox::Default,
            QIMessageBox::Cancel | QIMessageBox::Escape,
            0,
            0,
            tr("E&xit", "warnAboutSettingsAutoConversion message box"));
    }
}

/**
 *  @param strHotKey Fullscreen hot key as defined in the menu.
 *
 *  @return @c true if the user has chosen to go fullscreen (this is always
 *  the case if the dialog was autoconfirmed).
 */
bool UIMessageCenter::confirmGoingFullscreen(const QString &strHotKey)
{
    return messageOkCancel(mainMachineWindowShown(), Info,
        tr("<p>The virtual machine window will be now switched to <b>fullscreen</b> mode. "
           "You can go back to windowed mode at any time by pressing <b>%1</b>.</p>"
           "<p>Note that the <i>Host</i> key is currently defined as <b>%2</b>.</p>"
           "<p>Note that the main menu bar is hidden in fullscreen mode. "
           "You can access it by pressing <b>Host+Home</b>.</p>")
            .arg(strHotKey)
            .arg(UIHotKeyCombination::toReadableString(vboxGlobal().settings().hostCombo())),
        "confirmGoingFullscreen",
        tr("Switch", "fullscreen"));
}

/**
 *  @param strHotKey Seamless hot key as defined in the menu.
 *
 *  @return @c true if the user has chosen to go seamless (this is always
 *  the case if the dialog was autoconfirmed).
 */
bool UIMessageCenter::confirmGoingSeamless(const QString &strHotKey)
{
    return messageOkCancel(mainMachineWindowShown(), Info,
        tr("<p>The virtual machine window will be now switched to <b>Seamless</b> mode. "
           "You can go back to windowed mode at any time by pressing <b>%1</b>.</p>"
           "<p>Note that the <i>Host</i> key is currently defined as <b>%2</b>.</p>"
           "<p>Note that the main menu bar is hidden in seamless mode. "
           "You can access it by pressing <b>Host+Home</b>.</p>")
            .arg(strHotKey)
            .arg(UIHotKeyCombination::toReadableString(vboxGlobal().settings().hostCombo())),
        "confirmGoingSeamless",
        tr("Switch", "seamless"));
}

/**
 *  @param strHotKey Scale hot key as defined in the menu.
 *
 *  @return @c true if the user has chosen to go scale (this is always
 *  the case if the dialog was autoconfirmed).
 */
bool UIMessageCenter::confirmGoingScale(const QString &strHotKey)
{
    return messageOkCancel(mainMachineWindowShown(), Info,
        tr("<p>The virtual machine window will be now switched to <b>Scale</b> mode. "
           "You can go back to windowed mode at any time by pressing <b>%1</b>.</p>"
           "<p>Note that the <i>Host</i> key is currently defined as <b>%2</b>.</p>"
           "<p>Note that the main menu bar is hidden in scale mode. "
           "You can access it by pressing <b>Host+Home</b>.</p>")
            .arg(strHotKey)
            .arg(UIHotKeyCombination::toReadableString(vboxGlobal().settings().hostCombo())),
        "confirmGoingScale",
        tr("Switch", "scale"));
}

/**
 *  Returns @c true if the user has selected to power off the machine.
 */
bool UIMessageCenter::remindAboutGuruMeditation(const CConsole &console,
                                                const QString &strLogFolder)
{
    Q_UNUSED(console);

    int rc = message(mainMachineWindowShown(), GuruMeditation,
        tr("<p>A critical error has occurred while running the virtual "
           "machine and the machine execution has been stopped.</p>"
           ""
           "<p>For help, please see the Community section on "
           "<a href=http://www.virtualbox.org>http://www.virtualbox.org</a> "
           "or your support contract. Please provide the contents of the "
           "log file <tt>VBox.log</tt> and the image file <tt>VBox.png</tt>, "
           "which you can find in the <nobr><b>%1</b></nobr> directory, "
           "as well as a description of what you were doing when this error "
           "happened. "
           ""
           "Note that you can also access the above files by selecting "
           "<b>Show Log</b> from the <b>Machine</b> menu of the main "
           "VirtualBox window.</p>"
           ""
           "<p>Press <b>OK</b> if you want to power off the machine "
           "or press <b>Ignore</b> if you want to leave it as is for debugging. "
           "Please note that debugging requires special knowledge and tools, so "
           "it is recommended to press <b>OK</b> now.</p>")
            .arg(strLogFolder),
        0, /* pcszAutoConfirmId */
        QIMessageBox::Ok | QIMessageBox::Default,
        QIMessageBox::Ignore | QIMessageBox::Escape);

    return rc == QIMessageBox::Ok;
}

/**
 *  @return @c true if the user has selected to reset the machine.
 */
bool UIMessageCenter::confirmVMReset(const QString &strNames)
{
    return messageOkCancel(mainMachineWindowShown(), Question,
        tr("<p>Do you really want to reset the following virtual machines?</p>"
           "<p><b>%1</b></p><p>This will cause any unsaved data "
           "in applications running inside it to be lost.</p>")
           .arg(strNames),
        "confirmVMReset" /* pcszAutoConfirmId */,
        tr("Reset", "machine"));
}

bool UIMessageCenter::confirmVMACPIShutdown(const QString &strNames)
{
    return messageOkCancel(mainMachineWindowShown(), Question,
        tr("<p>Do you really want to send an ACPI shutdown signal "
           "to the following virtual machines?</p><p><b>%1</b></p>")
           .arg(strNames),
        "confirmVMACPIShutdown" /* pcszAutoConfirmId */,
        tr("ACPI Shutdown", "machine"));
}

bool UIMessageCenter::confirmVMPowerOff(const QString &strNames)
{
    return messageOkCancel(mainMachineWindowShown(), Question,
        tr("<p>Do you really want to power off the following virtual machines?</p>"
           "<p><b>%1</b></p><p>This will cause any unsaved data in applications "
           "running inside it to be lost.</p>")
           .arg(strNames),
        "confirmVMPowerOff" /* pcszAutoConfirmId */,
        tr("Power Off", "machine"));
}

void UIMessageCenter::warnAboutCannotRemoveMachineFolder(QWidget *pParent, const QString &strFolderName)
{
    QFileInfo fi(strFolderName);
    message(pParent ? pParent : mainWindowShown(), Critical,
            tr("<p>Cannot remove the machine folder <nobr><b>%1</b>.</nobr></p>"
               "<p>Please check that this folder really exists and that you have permissions to remove it.</p>")
               .arg(fi.fileName()));
}

void UIMessageCenter::warnAboutCannotRewriteMachineFolder(QWidget *pParent, const QString &strFolderName)
{
    QFileInfo fi(strFolderName);
    message(pParent ? pParent : mainWindowShown(), Critical,
            tr("<p>Cannot create the machine folder <b>%1</b> in the parent folder <nobr><b>%2</b>.</nobr></p>"
               "<p>This folder already exists and possibly belongs to another machine.</p>")
               .arg(fi.fileName()).arg(fi.absolutePath()));
}

void UIMessageCenter::warnAboutCannotCreateMachineFolder(QWidget *pParent, const QString &strFolderName)
{
    QFileInfo fi(strFolderName);
    message(pParent ? pParent : mainWindowShown(), Critical,
            tr("<p>Cannot create the machine folder <b>%1</b> in the parent folder <nobr><b>%2</b>.</nobr></p>"
               "<p>Please check that the parent really exists and that you have permissions to create the machine folder.</p>")
               .arg(fi.fileName()).arg(fi.absolutePath()));
}

/**
 *  @return @c true if the user has selected to continue without attaching a
 *  hard disk.
 */
bool UIMessageCenter::confirmHardDisklessMachine(QWidget *pParent)
{
    return message(pParent, Warning,
        tr("You are about to create a new virtual machine without a hard drive. "
           "You will not be able to install an operating system on the machine "
           "until you add one. In the mean time you will only be able to start the "
           "machine using a virtual optical disk or from the network."),
        0, /* pcszAutoConfirmId */
        QIMessageBox::Ok,
        QIMessageBox::Cancel | QIMessageBox::Default | QIMessageBox::Escape,
        0,
        tr("Continue", "no hard disk attached"),
        tr("Go Back", "no hard disk attached")) == QIMessageBox::Ok;
}

void UIMessageCenter::cannotRunInSelectorMode()
{
    message(mainWindowShown(), Critical,
        tr("<p>Cannot run VirtualBox in <i>VM Selector</i> "
           "mode due to local restrictions.</p>"
           "<p>The application will now terminate.</p>"));
}

void UIMessageCenter::cannotImportAppliance(CAppliance *pAppliance,
                                            QWidget *pParent /* = NULL */) const
{
    if (pAppliance->isNull())
    {
        message(pParent ? pParent : mainWindowShown(),
                Error,
                tr("Failed to open appliance."));
    }
    else
    {
        /* Preserve the current error info before calling the object again */
        COMResult res(*pAppliance);

        /* Add the warnings in the case of an early error */
        QVector<QString> w = pAppliance->GetWarnings();
        QString wstr;
        foreach(const QString &str, w)
            wstr += QString("<br />Warning: %1").arg(str);
        if (!wstr.isEmpty())
            wstr = "<br />" + wstr;

        message(pParent ? pParent : mainWindowShown(),
                Error,
                tr("Failed to open/interpret appliance <b>%1</b>.").arg(pAppliance->GetPath()),
                wstr +
                formatErrorInfo(res));
    }
}

void UIMessageCenter::cannotImportAppliance(const CProgress &progress,
                                            CAppliance* pAppliance,
                                            QWidget *pParent /* = NULL */) const
{
    AssertWrapperOk(progress);

    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to import appliance <b>%1</b>.").arg(pAppliance->GetPath()),
            formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotCheckFiles(const CProgress &progress,
                                       QWidget *pParent /* = NULL */) const
{
    AssertWrapperOk(progress);

    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to check files."),
            formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotRemoveFiles(const CProgress &progress,
                                        QWidget *pParent /* = NULL */) const
{
    AssertWrapperOk(progress);

    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to remove file."),
            formatErrorInfo(progress.GetErrorInfo()));
}

bool UIMessageCenter::confirmExportMachinesInSaveState(const QStringList &strMachineNames,
                                                       QWidget *pParent /* = NULL */) const
{
    return messageOkCancel(pParent ? pParent : mainWindowShown(), Warning,
        tr("<p>The %n following virtual machine(s) are currently in a saved state: <b>%1</b></p>"
           "<p>If you continue the runtime state of the exported machine(s) "
           "will be discarded. The other machine(s) will not be changed.</p>", "This text is never used with n == 0.  Feel free to drop the %n where possible, we only included it because of problems with Qt Linguist (but the user can see how many machines are in the list and doesn't need to be told).",
           strMachineNames.size()).arg(VBoxGlobal::toHumanReadableList(strMachineNames)),
        0 /* pcszAutoConfirmId */,
        tr("Continue"), tr("Cancel"));
}

void UIMessageCenter::cannotExportAppliance(CAppliance *pAppliance,
                                            QWidget *pParent /* = NULL */) const
{
    if (pAppliance->isNull())
    {
        message(pParent ? pParent : mainWindowShown(),
                Error,
                tr("Failed to create appliance."));
    }
    else
    {
        /* Preserve the current error info before calling the object again */
        COMResult res(*pAppliance);

        message(pParent ? pParent : mainWindowShown(),
                Error,
                tr("Failed to prepare the export of the appliance <b>%1</b>.").arg(pAppliance->GetPath()),
                formatErrorInfo(res));
    }
}

void UIMessageCenter::cannotExportAppliance(const CMachine &machine,
                                            CAppliance *pAppliance,
                                            QWidget *pParent /* = NULL */) const
{
    if (pAppliance->isNull() ||
        machine.isNull())
    {
        message(pParent ? pParent : mainWindowShown(),
                Error,
                tr("Failed to create an appliance."));
    }
    else
    {
        message(pParent ? pParent : mainWindowShown(),
                Error,
                tr("Failed to prepare the export of the appliance <b>%1</b>.").arg(pAppliance->GetPath()),
                formatErrorInfo(machine));
    }
}

void UIMessageCenter::cannotExportAppliance(const CProgress &progress,
                                            CAppliance* pAppliance,
                                            QWidget *pParent /* = NULL */) const
{
    AssertWrapperOk(progress);

    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to export appliance <b>%1</b>.").arg(pAppliance->GetPath()),
            formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotUpdateGuestAdditions(const CProgress &progress,
                                                 QWidget *pParent /* = NULL */) const
{
    AssertWrapperOk(progress);

    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to update Guest Additions. The Guest Additions installation image will be mounted to provide a manual installation."),
            formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::cannotOpenExtPack(const QString &strFilename,
                                        const CExtPackManager &extPackManager,
                                        QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to open the Extension Pack <b>%1</b>.").arg(strFilename),
            formatErrorInfo(extPackManager));
}

void UIMessageCenter::badExtPackFile(const QString &strFilename,
                                     const CExtPackFile &extPackFile,
                                     QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to open the Extension Pack <b>%1</b>.").arg(strFilename),
            "<!--EOM-->" + extPackFile.GetWhyUnusable());
}

void UIMessageCenter::cannotInstallExtPack(const QString &strFilename,
                                           const CExtPackFile &extPackFile,
                                           const CProgress &progress,
                                           QWidget *pParent)
{
    if (!pParent)
        pParent = mainWindowShown();
    QString strErrInfo = !extPackFile.isOk() || progress.isNull()
                       ? formatErrorInfo(extPackFile) : formatErrorInfo(progress.GetErrorInfo());
    message(pParent,
            Error,
            tr("Failed to install the Extension Pack <b>%1</b>.").arg(strFilename),
            strErrInfo);
}

void UIMessageCenter::cannotUninstallExtPack(const QString &strPackName, const CExtPackManager &extPackManager,
                                             const CProgress &progress, QWidget *pParent)
{
    if (!pParent)
        pParent = mainWindowShown();
    QString strErrInfo = !extPackManager.isOk() || progress.isNull()
                       ? formatErrorInfo(extPackManager) : formatErrorInfo(progress.GetErrorInfo());
    message(pParent,
            Error,
            tr("Failed to uninstall the Extension Pack <b>%1</b>.").arg(strPackName),
            strErrInfo);
}

bool UIMessageCenter::confirmInstallingPackage(const QString &strPackName, const QString &strPackVersion,
                                               const QString &strPackDescription, QWidget *pParent)
{
    return messageOkCancel(pParent ? pParent : mainWindowShown(),
                           Question,
                           tr("<p>You are about to install a VirtualBox extension pack. "
                              "Extension packs complement the functionality of VirtualBox and can contain system level software "
                              "that could be potentially harmful to your system. Please review the description below and only proceed "
                              "if you have obtained the extension pack from a trusted source.</p>"
                              "<p><table cellpadding=0 cellspacing=0>"
                              "<tr><td><b>Name:&nbsp;&nbsp;</b></td><td>%1</td></tr>"
                              "<tr><td><b>Version:&nbsp;&nbsp;</b></td><td>%2</td></tr>"
                              "<tr><td><b>Description:&nbsp;&nbsp;</b></td><td>%3</td></tr>"
                              "</table></p>")
                           .arg(strPackName).arg(strPackVersion).arg(strPackDescription),
                           0,
                           tr("&Install"));
}

bool UIMessageCenter::confirmReplacePackage(const QString &strPackName, const QString &strPackVersionNew,
                                            const QString &strPackVersionOld, const QString &strPackDescription,
                                            QWidget *pParent)
{
    if (!pParent)
        pParent = pParent ? pParent : mainWindowShown(); /* this is boring stuff that messageOkCancel should do! */

    QString strBelehrung = tr("Extension packs complement the functionality of VirtualBox and can contain "
                              "system level software that could be potentially harmful to your system. "
                              "Please review the description below and only proceed if you have obtained "
                              "the extension pack from a trusted source.");

    QByteArray  ba1     = strPackVersionNew.toUtf8();
    QByteArray  ba2     = strPackVersionOld.toUtf8();
    int         iVerCmp = RTStrVersionCompare(ba1.constData(), ba2.constData());

    bool fRc;
    if (iVerCmp > 0)
        fRc = messageOkCancel(pParent,
                              Question,
                              tr("<p>An older version of the extension pack is already installed, would you like to upgrade? "
                                 "<p>%1</p>"
                                 "<p><table cellpadding=0 cellspacing=0>"
                                 "<tr><td><b>Name:&nbsp;&nbsp;</b></td><td>%2</td></tr>"
                                 "<tr><td><b>New Version:&nbsp;&nbsp;</b></td><td>%3</td></tr>"
                                 "<tr><td><b>Current Version:&nbsp;&nbsp;</b></td><td>%4</td></tr>"
                                 "<tr><td><b>Description:&nbsp;&nbsp;</b></td><td>%5</td></tr>"
                                 "</table></p>")
                              .arg(strBelehrung).arg(strPackName).arg(strPackVersionNew).arg(strPackVersionOld).arg(strPackDescription),
                              0,
                              tr("&Upgrade"));
    else if (iVerCmp < 0)
        fRc = messageOkCancel(pParent,
                              Question,
                              tr("<p>An newer version of the extension pack is already installed, would you like to downgrade? "
                                 "<p>%1</p>"
                                 "<p><table cellpadding=0 cellspacing=0>"
                                 "<tr><td><b>Name:&nbsp;&nbsp;</b></td><td>%2</td></tr>"
                                 "<tr><td><b>New Version:&nbsp;&nbsp;</b></td><td>%3</td></tr>"
                                 "<tr><td><b>Current Version:&nbsp;&nbsp;</b></td><td>%4</td></tr>"
                                 "<tr><td><b>Description:&nbsp;&nbsp;</b></td><td>%5</td></tr>"
                                 "</table></p>")
                              .arg(strBelehrung).arg(strPackName).arg(strPackVersionNew).arg(strPackVersionOld).arg(strPackDescription),
                              0,
                              tr("&Downgrade"));
    else
        fRc = messageOkCancel(pParent,
                              Question,
                              tr("<p>The extension pack is already installed with the same version, would you like reinstall it? "
                                 "<p>%1</p>"
                                 "<p><table cellpadding=0 cellspacing=0>"
                                 "<tr><td><b>Name:&nbsp;&nbsp;</b></td><td>%2</td></tr>"
                                 "<tr><td><b>Version:&nbsp;&nbsp;</b></td><td>%3</td></tr>"
                                 "<tr><td><b>Description:&nbsp;&nbsp;</b></td><td>%4</td></tr>"
                                 "</table></p>")
                              .arg(strBelehrung).arg(strPackName).arg(strPackVersionOld).arg(strPackDescription),
                              0,
                              tr("&Reinstall"));
    return fRc;
}

bool UIMessageCenter::confirmRemovingPackage(const QString &strPackName, QWidget *pParent)
{
    return messageOkCancel(pParent ? pParent : mainWindowShown(),
                            Question,
                            tr("<p>You are about to remove the VirtualBox extension pack <b>%1</b>.</p>"
                               "<p>Are you sure you want to proceed?</p>").arg(strPackName),
                            0,
                            tr("&Remove"));
}

void UIMessageCenter::notifyAboutExtPackInstalled(const QString &strPackName, QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(),
             Info,
             tr("The extension pack <br><nobr><b>%1</b><nobr><br> was installed successfully.").arg(strPackName));
}

void UIMessageCenter::warnAboutIncorrectPort(QWidget *pParent) const
{
    message(pParent, Error,
            tr("The current port forwarding rules are not valid. "
               "None of the host or guest port values may be set to zero."));
}

bool UIMessageCenter::confirmCancelingPortForwardingDialog(QWidget *pParent) const
{
    return messageOkCancel(pParent, Question,
        tr("<p>There are unsaved changes in the port forwarding configuration.</p>"
           "<p>If you proceed your changes will be discarded.</p>"));
}

void UIMessageCenter::showRuntimeError(const CConsole &console, bool fFatal,
                                       const QString &strErrorId,
                                       const QString &strErrorMsg) const
{
    /// @todo (r=dmik) it's just a preliminary box. We need to:
    //  - for fFatal errors and non-fFatal with-retry errors, listen for a
    //    VM state signal to automatically close the message if the VM
    //    (externally) leaves the Paused state while it is shown.
    //  - make warning messages modeless
    //  - add common buttons like Retry/Save/PowerOff/whatever

    QByteArray autoConfimId = "showRuntimeError.";

    CConsole console1 = console;
    KMachineState state = console1.GetState();
    Type type;
    QString severity;

    if (fFatal)
    {
        /* the machine must be paused on fFatal errors */
        Assert(state == KMachineState_Paused);
        if (state != KMachineState_Paused)
            console1.Pause();
        type = Critical;
        severity = tr("<nobr>Fatal Error</nobr>", "runtime error info");
        autoConfimId += "fatal.";
    }
    else if (state == KMachineState_Paused)
    {
        type = Error;
        severity = tr("<nobr>Non-Fatal Error</nobr>", "runtime error info");
        autoConfimId += "error.";
    }
    else
    {
        type = Warning;
        severity = tr("<nobr>Warning</nobr>", "runtime error info");
        autoConfimId += "warning.";
    }

    autoConfimId += strErrorId.toUtf8();

    QString formatted("<!--EOM-->");

    if (!strErrorMsg.isEmpty())
        formatted.prepend(QString("<p>%1.</p>").arg(vboxGlobal().emphasize(strErrorMsg)));

    if (!strErrorId.isEmpty())
        formatted += QString("<table bgcolor=#EEEEEE border=0 cellspacing=0 "
                             "cellpadding=0 width=100%>"
                             "<tr><td>%1</td><td>%2</td></tr>"
                             "<tr><td>%3</td><td>%4</td></tr>"
                             "</table>")
                              .arg(tr("<nobr>Error ID: </nobr>", "runtime error info"),
                                    strErrorId)
                              .arg(tr("Severity: ", "runtime error info"),
                                    severity);

    if (!formatted.isEmpty())
        formatted = "<qt>" + formatted + "</qt>";

    int rc = 0;

    if (type == Critical)
    {
        rc = message(mainMachineWindowShown(), type,
            tr("<p>A fatal error has occurred during virtual machine execution! "
               "The virtual machine will be powered off. Please copy the "
               "following error message using the clipboard to help diagnose "
               "the problem:</p>"),
            formatted, autoConfimId.data());

        /* always power down after a fFatal error */
        console1.PowerDown();
    }
    else if (type == Error)
    {
        rc = message(mainMachineWindowShown(), type,
            tr("<p>An error has occurred during virtual machine execution! "
               "The error details are shown below. You may try to correct "
               "the error and resume the virtual machine "
               "execution.</p>"),
            formatted, autoConfimId.data());
    }
    else
    {
        rc = message(mainMachineWindowShown(), type,
            tr("<p>The virtual machine execution may run into an error "
               "condition as described below. "
               "We suggest that you take "
               "an appropriate action to avert the error."
               "</p>"),
            formatted, autoConfimId.data());
    }

    NOREF(rc);
}

/* static */
QString UIMessageCenter::mediumToAccusative(UIMediumType type, bool fIsHostDrive /* = false */)
{
    QString strType =
        type == UIMediumType_HardDisk ?
            tr("hard disk", "failed to mount ...") :
        type == UIMediumType_DVD && fIsHostDrive ?
            tr("CD/DVD", "failed to mount ... host-drive") :
        type == UIMediumType_DVD && !fIsHostDrive ?
            tr("CD/DVD image", "failed to mount ...") :
        type == UIMediumType_Floppy && fIsHostDrive ?
            tr("floppy", "failed to mount ... host-drive") :
        type == UIMediumType_Floppy && !fIsHostDrive ?
            tr("floppy image", "failed to mount ...") :
        QString::null;

    Assert(!strType.isNull());
    return strType;
}

/**
 * Formats the given COM result code as a human-readable string.
 *
 * If a mnemonic name for the given result code is found, a string in format
 * "MNEMONIC_NAME (0x12345678)" is returned where the hex number is the result
 * code as is. If no mnemonic name is found, then the raw hex number only is
 * returned (w/o pParenthesis).
 *
 * @param rc   COM result code to format.
 */
/* static */
QString UIMessageCenter::formatRC(HRESULT rc)
{
    QString str;

    PCRTCOMERRMSG msg = NULL;
    const char *errMsg = NULL;

    /* first, try as is (only set bit 31 bit for warnings) */
    if (SUCCEEDED_WARNING(rc))
        msg = RTErrCOMGet(rc | 0x80000000);
    else
        msg = RTErrCOMGet(rc);

    if (msg != NULL)
        errMsg = msg->pszDefine;

#if defined (Q_WS_WIN)

    PCRTWINERRMSG winMsg = NULL;

    /* if not found, try again using RTErrWinGet with masked off top 16bit */
    if (msg == NULL)
    {
        winMsg = RTErrWinGet(rc & 0xFFFF);

        if (winMsg != NULL)
            errMsg = winMsg->pszDefine;
    }

#endif

    if (errMsg != NULL && *errMsg != '\0')
        str.sprintf("%s (0x%08X)", errMsg, rc);
    else
        str.sprintf("0x%08X", rc);

    return str;
}

/* static */
QString UIMessageCenter::formatErrorInfo(const COMErrorInfo &info,
                                         HRESULT wrapperRC /* = S_OK */)
{
    QString formatted = errorInfoToString(info, wrapperRC);
    return QString("<qt>%1</qt>").arg(formatted);
}

void UIMessageCenter::cannotCreateHostInterface(const CHost &host, QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotCreateHostInterface(host, pParent);
    else
        emit sigCannotCreateHostInterface(host, pParent);
}

void UIMessageCenter::cannotCreateHostInterface(const CProgress &progress, QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotCreateHostInterface(progress, pParent);
    else
        emit sigCannotCreateHostInterface(progress, pParent);
}

void UIMessageCenter::cannotRemoveHostInterface(const CHost &host, const CHostNetworkInterface &iface,
                                                QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotRemoveHostInterface(host, iface ,pParent);
    else
        emit sigCannotRemoveHostInterface(host, iface, pParent);
}

void UIMessageCenter::cannotRemoveHostInterface(const CProgress &progress, const CHostNetworkInterface &iface,
                                                QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotRemoveHostInterface(progress, iface, pParent);
    else
        emit sigCannotRemoveHostInterface(progress, iface, pParent);
}

void UIMessageCenter::cannotAttachDevice(const CMachine &machine, UIMediumType type,
                                         const QString &strLocation, const StorageSlot &storageSlot,
                                         QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotAttachDevice(machine, type, strLocation, storageSlot, pParent);
    else
        emit sigCannotAttachDevice(machine, type, strLocation, storageSlot, pParent);
}

void UIMessageCenter::cannotCreateSharedFolder(const CMachine &machine, const QString &strName,
                                               const QString &strPath, QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotCreateSharedFolder(machine, strName, strPath, pParent);
    else
        emit sigCannotCreateSharedFolder(machine, strName, strPath, pParent);
}

void UIMessageCenter::cannotRemoveSharedFolder(const CMachine &machine, const QString &strName,
                                               const QString &strPath, QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotRemoveSharedFolder(machine, strName, strPath, pParent);
    else
        emit sigCannotRemoveSharedFolder(machine, strName, strPath, pParent);
}

void UIMessageCenter::cannotCreateSharedFolder(const CConsole &console, const QString &strName,
                                               const QString &strPath, QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotCreateSharedFolder(console, strName, strPath, pParent);
    else
        emit sigCannotCreateSharedFolder(console, strName, strPath, pParent);
}

void UIMessageCenter::cannotRemoveSharedFolder(const CConsole &console, const QString &strName,
                                               const QString &strPath, QWidget *pParent /* = 0 */)
{
    if (thread() == QThread::currentThread())
        sltCannotRemoveSharedFolder(console, strName, strPath, pParent);
    else
        emit sigCannotRemoveSharedFolder(console, strName, strPath, pParent);
}

#ifdef VBOX_WITH_DRAG_AND_DROP
void UIMessageCenter::cannotDropData(const CGuest &guest,
                                     QWidget *pParent /* = 0 */) const
{
    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to drop data."),
            formatErrorInfo(guest));
}

void UIMessageCenter::cannotDropData(const CProgress &progress,
                                     QWidget *pParent /* = 0 */) const
{
    AssertWrapperOk(progress);

    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Failed to drop data."),
            formatErrorInfo(progress.GetErrorInfo()));
}
#endif /* VBOX_WITH_DRAG_AND_DROP */

void UIMessageCenter::remindAboutWrongColorDepth(ulong uRealBPP, ulong uWantedBPP)
{
    emit sigRemindAboutWrongColorDepth(uRealBPP, uWantedBPP);
}

void UIMessageCenter::showGenericError(COMBaseWithEI *object, QWidget *pParent /* = 0 */)
{
    if (   !object
        || object->lastRC() == S_OK)
        return;

    message(pParent ? pParent : mainWindowShown(),
            Error,
            tr("Sorry, some generic error happens."),
            formatErrorInfo(*object));
}

// Public slots
/////////////////////////////////////////////////////////////////////////////

void UIMessageCenter::remindAboutUnsupportedUSB2(const QString &strExtPackName, QWidget *pParent)
{
    emit sigRemindAboutUnsupportedUSB2(strExtPackName, pParent);
}

void UIMessageCenter::sltShowHelpWebDialog()
{
    vboxGlobal().openURL("http://www.virtualbox.org");
}

void UIMessageCenter::sltShowHelpAboutDialog()
{
    CVirtualBox vbox = vboxGlobal().virtualBox();
    QString strFullVersion;
    if (vboxGlobal().brandingIsActive())
    {
        strFullVersion = QString("%1 r%2 - %3").arg(vbox.GetVersion())
                                               .arg(vbox.GetRevision())
                                               .arg(vboxGlobal().brandingGetKey("Name"));
    }
    else
    {
        strFullVersion = QString("%1 r%2").arg(vbox.GetVersion())
                                          .arg(vbox.GetRevision());
    }
    AssertWrapperOk(vbox);

    (new VBoxAboutDlg(mainWindowShown(), strFullVersion))->show();
}

void UIMessageCenter::sltShowHelpHelpDialog()
{
#ifndef VBOX_OSE
    /* For non-OSE version we just open it: */
    sltShowUserManual(vboxGlobal().helpFile());
#else /* #ifndef VBOX_OSE */
    /* For OSE version we have to check if it present first: */
    QString strUserManualFileName1 = vboxGlobal().helpFile();
    QString strShortFileName = QFileInfo(strUserManualFileName1).fileName();
    QString strUserManualFileName2 = QDir(vboxGlobal().virtualBox().GetHomeFolder()).absoluteFilePath(strShortFileName);
    /* Show if user manual already present: */
    if (QFile::exists(strUserManualFileName1))
        sltShowUserManual(strUserManualFileName1);
    else if (QFile::exists(strUserManualFileName2))
        sltShowUserManual(strUserManualFileName2);
    /* If downloader is running already: */
    else if (UIDownloaderUserManual::current())
    {
        /* Just show network access manager: */
        gNetworkManager->show();
    }
    /* Else propose to download user manual: */
    else if (askAboutUserManualDownload(strUserManualFileName1))
    {
        /* Create User Manual downloader: */
        UIDownloaderUserManual *pDl = UIDownloaderUserManual::create();
        /* After downloading finished => show User Manual: */
        connect(pDl, SIGNAL(sigDownloadFinished(const QString&)), this, SLOT(sltShowUserManual(const QString&)));
        /* Start downloading: */
        pDl->start();
    }
#endif /* #ifdef VBOX_OSE */
}

void UIMessageCenter::sltResetSuppressedMessages()
{
    CVirtualBox vbox = vboxGlobal().virtualBox();
    vbox.SetExtraData(GUI_SuppressMessages, QString::null);
}

void UIMessageCenter::sltShowUserManual(const QString &strLocation)
{
#if defined (Q_WS_WIN32)
    HtmlHelp(GetDesktopWindow(), strLocation.utf16(), HH_DISPLAY_TOPIC, NULL);
#elif defined (Q_WS_X11)
# ifndef VBOX_OSE
    char szViewerPath[RTPATH_MAX];
    int rc;
    rc = RTPathAppPrivateArch(szViewerPath, sizeof(szViewerPath));
    AssertRC(rc);
    QProcess::startDetached(QString(szViewerPath) + "/kchmviewer", QStringList(strLocation));
# else /* #ifndef VBOX_OSE */
    vboxGlobal().openURL("file://" + strLocation);
# endif /* #ifdef VBOX_OSE */
#elif defined (Q_WS_MAC)
    vboxGlobal().openURL("file://" + strLocation);
#endif
}

void UIMessageCenter::sltCannotCreateHostInterface(const CHost &host, QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(), Error,
            tr("Failed to create the host-only network interface."),
            formatErrorInfo(host));
}

void UIMessageCenter::sltCannotCreateHostInterface(const CProgress &progress, QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(), Error,
            tr("Failed to create the host-only network interface."),
            formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::sltCannotRemoveHostInterface(const CHost &host, const CHostNetworkInterface &iface, QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(), Error,
            tr("Failed to remove the host network interface <b>%1</b>.")
               .arg(iface.GetName()),
            formatErrorInfo(host));
}

void UIMessageCenter::sltCannotRemoveHostInterface(const CProgress &progress, const CHostNetworkInterface &iface, QWidget *pParent)
{
    message(pParent ? pParent : mainWindowShown(), Error,
            tr("Failed to remove the host network interface <b>%1</b>.")
               .arg(iface.GetName()),
            formatErrorInfo(progress.GetErrorInfo()));
}

void UIMessageCenter::sltCannotAttachDevice(const CMachine &machine, UIMediumType type,
                                            const QString &strLocation, const StorageSlot &storageSlot,
                                            QWidget *pParent)
{
    QString strMessage;
    switch (type)
    {
        case UIMediumType_HardDisk:
        {
            strMessage = tr("Failed to attach the hard disk (<nobr><b>%1</b></nobr>) to the slot <i>%2</i> of the machine <b>%3</b>.")
                           .arg(strLocation).arg(gpConverter->toString(storageSlot)).arg(CMachine(machine).GetName());
            break;
        }
        case UIMediumType_DVD:
        {
            strMessage = tr("Failed to attach the CD/DVD device (<nobr><b>%1</b></nobr>) to the slot <i>%2</i> of the machine <b>%3</b>.")
                           .arg(strLocation).arg(gpConverter->toString(storageSlot)).arg(CMachine(machine).GetName());
            break;
        }
        case UIMediumType_Floppy:
        {
            strMessage = tr("Failed to attach the floppy device (<nobr><b>%1</b></nobr>) to the slot <i>%2</i> of the machine <b>%3</b>.")
                           .arg(strLocation).arg(gpConverter->toString(storageSlot)).arg(CMachine(machine).GetName());
            break;
        }
        default:
            break;
    }
    message(pParent ? pParent : mainWindowShown(), Error, strMessage, formatErrorInfo(machine));
}

void UIMessageCenter::sltCannotCreateSharedFolder(const CMachine &machine, const QString &strName,
                                                  const QString &strPath, QWidget *pParent)
{
    message(pParent ? pParent : mainMachineWindowShown(), Error,
            tr("Failed to create the shared folder <b>%1</b> "
               "(pointing to <nobr><b>%2</b></nobr>) "
               "for the virtual machine <b>%3</b>.")
               .arg(strName)
               .arg(strPath)
               .arg(CMachine(machine).GetName()),
            formatErrorInfo(machine));
}

void UIMessageCenter::sltCannotRemoveSharedFolder(const CMachine &machine, const QString &strName,
                                                  const QString &strPath, QWidget *pParent)
{
    message(pParent ? pParent : mainMachineWindowShown(), Error,
            tr("Failed to remove the shared folder <b>%1</b> "
               "(pointing to <nobr><b>%2</b></nobr>) "
               "from the virtual machine <b>%3</b>.")
               .arg(strName)
               .arg(strPath)
               .arg(CMachine(machine).GetName()),
            formatErrorInfo(machine));
}

void UIMessageCenter::sltCannotCreateSharedFolder(const CConsole &console, const QString &strName,
                                                  const QString &strPath, QWidget *pParent)
{
    message(pParent ? pParent : mainMachineWindowShown(), Error,
            tr("Failed to create the shared folder <b>%1</b> "
               "(pointing to <nobr><b>%2</b></nobr>) "
               "for the virtual machine <b>%3</b>.")
               .arg(strName)
               .arg(strPath)
               .arg(CConsole(console).GetMachine().GetName()),
            formatErrorInfo(console));
}

void UIMessageCenter::sltCannotRemoveSharedFolder(const CConsole &console, const QString &strName,
                                                  const QString &strPath, QWidget *pParent)
{
    message(pParent ? pParent : mainMachineWindowShown(), Error,
            tr("<p>Failed to remove the shared folder <b>%1</b> "
               "(pointing to <nobr><b>%2</b></nobr>) "
               "from the virtual machine <b>%3</b>.</p>"
               "<p>Please close all programs in the guest OS that "
               "may be using this shared folder and try again.</p>")
               .arg(strName)
               .arg(strPath)
               .arg(CConsole(console).GetMachine().GetName()),
            formatErrorInfo(console));
}

void UIMessageCenter::sltRemindAboutWrongColorDepth(ulong uRealBPP, ulong uWantedBPP)
{
    const char *kName = "remindAboutWrongColorDepth";

    /* Close the previous (outdated) window if any. We use kName as
     * pcszAutoConfirmId which is also used as the widget name by default. */
    {
        QWidget *outdated = VBoxGlobal::findWidget(NULL, kName, "QIMessageBox");
        if (outdated)
            outdated->close();
    }

    message(mainMachineWindowShown(), Info,
            tr("<p>The virtual machine window is optimized to work in "
               "<b>%1&nbsp;bit</b> color mode but the "
               "virtual display is currently set to <b>%2&nbsp;bit</b>.</p>"
               "<p>Please open the display properties dialog of the guest OS and "
               "select a <b>%3&nbsp;bit</b> color mode, if it is available, for "
               "best possible performance of the virtual video subsystem.</p>"
               "<p><b>Note</b>. Some operating systems, like OS/2, may actually "
               "work in 32&nbsp;bit mode but report it as 24&nbsp;bit "
               "(16 million colors). You may try to select a different color "
               "mode to see if this message disappears or you can simply "
               "disable the message now if you are sure the required color "
               "mode (%4&nbsp;bit) is not available in the guest OS.</p>")
               .arg(uWantedBPP).arg(uRealBPP).arg(uWantedBPP).arg(uWantedBPP),
            kName);
}

void UIMessageCenter::sltRemindAboutUnsupportedUSB2(const QString &strExtPackName, QWidget *pParent)
{
    if (isAlreadyShown("sltRemindAboutUnsupportedUSB2"))
        return;
    setShownStatus("sltRemindAboutUnsupportedUSB2");

    message(pParent ? pParent : mainMachineWindowShown(), Warning,
            tr("<p>USB 2.0 is currently enabled for this virtual machine. "
               "However, this requires the <b><nobr>%1</nobr></b> to be installed.</p>"
               "<p>Please install the Extension Pack from the VirtualBox download site. "
               "After this you will be able to re-enable USB 2.0. "
               "It will be disabled in the meantime unless you cancel the current settings changes.</p>")
               .arg(strExtPackName));

    clearShownStatus("sltRemindAboutUnsupportedUSB2");
}

UIMessageCenter::UIMessageCenter()
{
    /* Register required objects as meta-types: */
    qRegisterMetaType<CProgress>();
    qRegisterMetaType<CHost>();
    qRegisterMetaType<CMachine>();
    qRegisterMetaType<CConsole>();
    qRegisterMetaType<CHostNetworkInterface>();
    qRegisterMetaType<UIMediumType>();
    qRegisterMetaType<StorageSlot>();

    /* Prepare required connections: */
    connect(this, SIGNAL(sigCannotCreateHostInterface(const CHost&, QWidget*)),
            this, SLOT(sltCannotCreateHostInterface(const CHost&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotCreateHostInterface(const CProgress&, QWidget*)),
            this, SLOT(sltCannotCreateHostInterface(const CProgress&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotRemoveHostInterface(const CHost&, const CHostNetworkInterface&, QWidget*)),
            this, SLOT(sltCannotRemoveHostInterface(const CHost&, const CHostNetworkInterface&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotRemoveHostInterface(const CProgress&, const CHostNetworkInterface&, QWidget*)),
            this, SLOT(sltCannotRemoveHostInterface(const CProgress&, const CHostNetworkInterface&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotAttachDevice(const CMachine&, UIMediumType, const QString&, const StorageSlot&, QWidget*)),
            this, SLOT(sltCannotAttachDevice(const CMachine&, UIMediumType, const QString&, const StorageSlot&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotCreateSharedFolder(const CMachine&, const QString&, const QString&, QWidget*)),
            this, SLOT(sltCannotCreateSharedFolder(const CMachine&, const QString&, const QString&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotRemoveSharedFolder(const CMachine&, const QString&, const QString&, QWidget*)),
            this, SLOT(sltCannotRemoveSharedFolder(const CMachine&, const QString&, const QString&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotCreateSharedFolder(const CConsole&, const QString&, const QString&, QWidget*)),
            this, SLOT(sltCannotCreateSharedFolder(const CConsole&, const QString&, const QString&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigCannotRemoveSharedFolder(const CConsole&, const QString&, const QString&, QWidget*)),
            this, SLOT(sltCannotRemoveSharedFolder(const CConsole&, const QString&, const QString&, QWidget*)),
            Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(sigRemindAboutWrongColorDepth(ulong, ulong)),
            this, SLOT(sltRemindAboutWrongColorDepth(ulong, ulong)), Qt::QueuedConnection);
    connect(this, SIGNAL(sigRemindAboutUnsupportedUSB2(const QString&, QWidget*)),
            this, SLOT(sltRemindAboutUnsupportedUSB2(const QString&, QWidget*)), Qt::QueuedConnection);

    /* Translations for Main.
     * Please make sure they corresponds to the strings coming from Main one-by-one symbol! */
    tr("Could not load the Host USB Proxy Service (VERR_FILE_NOT_FOUND). The service might not be installed on the host computer");
    tr("VirtualBox is not currently allowed to access USB devices.  You can change this by adding your user to the 'vboxusers' group.  Please see the user manual for a more detailed explanation");
    tr("VirtualBox is not currently allowed to access USB devices.  You can change this by allowing your user to access the 'usbfs' folder and files.  Please see the user manual for a more detailed explanation");
    tr("The USB Proxy Service has not yet been ported to this host");
    tr("Could not load the Host USB Proxy service");
}

/* Returns a reference to the global VirtualBox message center instance: */
UIMessageCenter &UIMessageCenter::instance()
{
    static UIMessageCenter global_instance;
    return global_instance;
}

QString UIMessageCenter::errorInfoToString(const COMErrorInfo &info,
                                           HRESULT wrapperRC /* = S_OK */)
{
    /* Compose complex details string with internal <!--EOM--> delimiter to
     * make it possible to split string into info & details parts which will
     * be used separately in QIMessageBox */
    QString formatted;

    /* Check if details text is NOT empty: */
    QString strDetailsInfo = info.text();
    if (!strDetailsInfo.isEmpty())
    {
        /* Check if details text written in English (latin1) and translated: */
        if (strDetailsInfo == QString::fromLatin1(strDetailsInfo.toLatin1()) &&
            strDetailsInfo != tr(strDetailsInfo.toLatin1().constData()))
            formatted += QString("<p>%1.</p>").arg(vboxGlobal().emphasize(tr(strDetailsInfo.toLatin1().constData())));
        else
            formatted += QString("<p>%1.</p>").arg(vboxGlobal().emphasize(strDetailsInfo));
    }

    formatted += "<!--EOM--><table bgcolor=#EEEEEE border=0 cellspacing=0 "
                 "cellpadding=0 width=100%>";

    bool haveResultCode = false;

    if (info.isBasicAvailable())
    {
#if defined (Q_WS_WIN)
        haveResultCode = info.isFullAvailable();
        bool haveComponent = true;
        bool haveInterfaceID = true;
#else /* defined (Q_WS_WIN) */
        haveResultCode = true;
        bool haveComponent = info.isFullAvailable();
        bool haveInterfaceID = info.isFullAvailable();
#endif

        if (haveResultCode)
        {
            formatted += QString("<tr><td>%1</td><td><tt>%2</tt></td></tr>")
                .arg(tr("Result&nbsp;Code: ", "error info"))
                .arg(formatRC(info.resultCode()));
        }

        if (haveComponent)
            formatted += QString("<tr><td>%1</td><td>%2</td></tr>")
                .arg(tr("Component: ", "error info"), info.component());

        if (haveInterfaceID)
        {
            QString s = info.interfaceID();
            if (!info.interfaceName().isEmpty())
                s = info.interfaceName() + ' ' + s;
            formatted += QString("<tr><td>%1</td><td>%2</td></tr>")
                .arg(tr("Interface: ", "error info"), s);
        }

        if (!info.calleeIID().isNull() && info.calleeIID() != info.interfaceID())
        {
            QString s = info.calleeIID();
            if (!info.calleeName().isEmpty())
                s = info.calleeName() + ' ' + s;
            formatted += QString("<tr><td>%1</td><td>%2</td></tr>")
                .arg(tr("Callee: ", "error info"), s);
        }
    }

    if (FAILED (wrapperRC) &&
        (!haveResultCode || wrapperRC != info.resultCode()))
    {
        formatted += QString("<tr><td>%1</td><td><tt>%2</tt></td></tr>")
            .arg(tr("Callee&nbsp;RC: ", "error info"))
            .arg(formatRC(wrapperRC));
    }

    formatted += "</table>";

    if (info.next())
        formatted = formatted + "<!--EOP-->" + errorInfoToString(*info.next());

    return formatted;
}