1 | /* $Id: VBoxUtils-win.cpp 71784 2018-04-09 15:56:21Z vboxsync $ */
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2 | /** @file
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3 | * VBox Qt GUI - Declarations of utility classes and functions for handling Windows specific tasks.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2010-2018 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 | /* GUI includes: */
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19 | #include "VBoxUtils-win.h"
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20 |
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21 |
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22 | /** Namespace for native window sub-system functions. */
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23 | namespace NativeWindowSubsystem
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24 | {
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25 | /** Enumerates visible always-on-top (top-most) windows. */
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26 | BOOL CALLBACK EnumWindowsProc(HWND hWnd, LPARAM lParam);
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27 | /** Contains visible top-most-window rectangles. */
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28 | QList<QRect> topMostRects;
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29 | }
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30 |
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31 | BOOL CALLBACK NativeWindowSubsystem::EnumWindowsProc(HWND hWnd, LPARAM)
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32 | {
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33 | /* Ignore NULL HWNDs: */
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34 | if (!hWnd)
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35 | return TRUE;
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36 |
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37 | /* Ignore hidden windows: */
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38 | if (!IsWindowVisible(hWnd))
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39 | return TRUE;
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40 |
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41 | /* Get window style: */
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42 | LONG uStyle = GetWindowLong(hWnd, GWL_STYLE);
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43 | /* Ignore minimized windows: */
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44 | if (uStyle & WS_MINIMIZE)
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45 | return TRUE;
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46 |
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47 | /* Get extended window style: */
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48 | LONG uExtendedStyle = GetWindowLong(hWnd, GWL_EXSTYLE);
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49 | /* Ignore non-top-most windows: */
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50 | if (!(uExtendedStyle & WS_EX_TOPMOST))
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51 | return TRUE;
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52 |
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53 | /* Get that window rectangle: */
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54 | RECT rect;
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55 | GetWindowRect(hWnd, &rect);
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56 | topMostRects << QRect(QPoint(rect.left, rect.top), QPoint(rect.right - 1, rect.bottom - 1));
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57 |
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58 | /* Proceed to the next window: */
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59 | return TRUE;
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60 | }
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61 |
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62 | const QRegion NativeWindowSubsystem::areaCoveredByTopMostWindows()
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63 | {
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64 | /* Prepare the top-most region: */
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65 | QRegion topMostRegion;
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66 | /* Initialize the list of the top-most rectangles: */
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67 | topMostRects.clear();
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68 | /* Populate the list of top-most rectangles: */
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69 | EnumWindows((WNDENUMPROC)EnumWindowsProc, 0);
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70 | /* Update the top-most region with top-most rectangles: */
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71 | for (int iRectIndex = 0; iRectIndex < topMostRects.size(); ++iRectIndex)
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72 | topMostRegion += topMostRects[iRectIndex];
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73 | /* Return top-most region: */
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74 | return topMostRegion;
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75 | }
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76 |
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