[vbox-dev] --grabimmediate patch for VBoxSDL

[Warren Block]

Hello to the list, and thanks for the work on VirtualBox.

Attached is a quick patch to VBoxSDL.  MIT license is fine.

The added --grabimmediate option lets the VM start with input already 
grabbed.

This is useful for when the guest is a mouseless OS that leaves the 
annoying default SDL mouse pointer on the screen until the user clicks 
the otherwise unnecessary mouse.

It may also be handy for general use, when you want any guest to start 
with input grabbed like a normal application.

It has worked in limited tests with small console guests (DOS, 
Linux systemrescuecd).

The patch is built to drop into the files directory of the FreeBSD 
virtualbox-ose port.

-Warren Block * Rapid City, South Dakota USA
-------------- next part --------------
--- src/VBox/Frontends/VBoxSDL/VBoxSDL.cpp.orig	2009-12-17 07:27:56.000000000 -0700
+++ src/VBox/Frontends/VBoxSDL/VBoxSDL.cpp	2010-01-28 09:36:27.000000000 -0700
@@ -178,6 +178,7 @@
 static const char *gHostKeyDisabledCombinations = "";
 static const char *gpszPidFile;
 static BOOL gfGrabbed = FALSE;
+static BOOL gfGrabImmediate = FALSE;
 static BOOL gfGrabOnMouseClick = TRUE;
 static BOOL gfFullscreenResize = FALSE;
 static BOOL gfIgnoreNextResize = FALSE;
@@ -663,6 +664,7 @@
              "  --nohostkey              Disable all hostkey combinations\n"
              "  --nohostkeys ...         Disable specific hostkey combinations, see below for valid keys\n"
              "  --nograbonclick          Disable mouse/keyboard grabbing on mouse click w/o additions\n"
+             "  --grabimmediate          Start with grab active\n"
              "  --detecthostkey          Get the hostkey identifier and modifier state\n"
              "  --hostkey <key> {<key2>} <mod> Set the host key to the values obtained using --detecthostkey\n"
              "  --termacpi               Send an ACPI power button event when closing the window\n"
@@ -1200,6 +1202,11 @@
         {
             gfGrabOnMouseClick = FALSE;
         }
+        else if (   !strcmp(argv[curArg], "--grabimmediate")
+                 || !strcmp(argv[curArg], "-grabimmediate"))
+        {
+            gfGrabImmediate = TRUE;
+        }
         else if (   !strcmp(argv[curArg], "--termacpi")
                  || !strcmp(argv[curArg], "-termacpi"))
         {
@@ -1859,7 +1866,7 @@
         // create our SDL framebuffer instance
         gpFramebuffer[i] = new VBoxSDLFB(i, fFullscreen, fResizable, fShowSDLConfig, false,
                                          fixedWidth, fixedHeight, fixedBPP);

         if (!gpFramebuffer[i])
         {
             RTPrintf("Error: could not create framebuffer object!\n");
@@ -1996,6 +2003,12 @@
     }
 #endif
 
+    /*
+     * WB: --grabimmediate: grab mouse input as soon as possible.
+     */
+    if (gfGrabImmediate)
+        InputGrabStart();
+
     rc = E_FAIL;
 #ifdef VBOXSDL_ADVANCED_OPTIONS
     if (fRawR0 != ~0U)
@@ -2306,7 +2319,7 @@
         RTFileWrite(PidFile, pcszLf, strlen(pcszLf), NULL);
         RTFileClose(PidFile);
     }

     /*
      * Main event loop
      */