Bug 511167 - Increase the thread priority between mouse down and mouse up (WINCE only). r=blassey

widget/src/windows/nsWindow.cpp

@@ -154,6 +154,7 @@
 
 #if defined(WINCE)
 #include "nsWindowCE.h"
+#define KILL_PRIORITY_ID 2444
 #endif
 
 #include "nsWindowGfx.h"
@@ -3784,6 +3785,11 @@ PRBool nsWindow::ProcessMessage(UINT msg, WPARAM &wParam, LPARAM &lParam,
 
     case WM_MOUSEMOVE:
     {
+#ifdef WINCE
+      // Reset the kill timer so that we can continue at this
+      // priority
+      SetTimer(mWnd, KILL_PRIORITY_ID, 2000 /* 2seconds */, NULL);
+#endif
       // Suppress dispatch of pending events
       // when mouse moves are generated by widget
       // creation instead of user input.
@@ -3803,8 +3809,19 @@ PRBool nsWindow::ProcessMessage(UINT msg, WPARAM &wParam, LPARAM &lParam,
     }
     break;
 
+    case WM_TIMER:
+#ifdef WINCE
+      SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL);
+      KillTimer(mWnd, KILL_PRIORITY_ID);
+#endif
+      break;
+
     case WM_LBUTTONDOWN:
     {
+#ifdef WINCE
+      SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
+      SetTimer(mWnd, KILL_PRIORITY_ID, 2000 /* 2 seconds */, NULL);
+#endif
       result = DispatchMouseEvent(NS_MOUSE_BUTTON_DOWN, wParam, lParam,
                                   PR_FALSE, nsMouseEvent::eLeftButton);
       DispatchPendingEvents();
@@ -3816,6 +3833,11 @@ PRBool nsWindow::ProcessMessage(UINT msg, WPARAM &wParam, LPARAM &lParam,
       result = DispatchMouseEvent(NS_MOUSE_BUTTON_UP, wParam, lParam,
                                   PR_FALSE, nsMouseEvent::eLeftButton);
       DispatchPendingEvents();
+
+#ifdef WINCE
+      SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_NORMAL);
+      KillTimer(mWnd, KILL_PRIORITY_ID);
+#endif
     }
     break;