Changeset 135 for trunk

Timestamp:

Oct 12, 2006, 12:35:42 AM (19 years ago)

Author:

dmik

Message:

Kernel: Fixed: in !QT_PM_NO_WIDGETMASK mode, performing a very quick series of one-two line scroll operations could make parts of the scrolled areas look "stuck" (not updated in time but with some delay) on heavy load of the GUI thread.

File:

• trunk/src/kernel/qwidget_pm.cpp (modified) (2 diffs)

trunk/src/kernel/qwidget_pm.cpp

@@ -2333 +2333 @@
     }
     
-    WinLockVisRegions( HWND_DESKTOP, TRUE );
-    
     HPS hps = WinGetPS( hwnd );
 
@@ -2404 +2402 @@
     WinReleasePS( hps );
     
-    WinLockVisRegions( HWND_DESKTOP, FALSE );
-    
-    WinUpdateWindow( hwnd );
+    // In order to get the effect of "instant" scrolling, we process WM_PAINT
+    // messages pending after invalidation manually instead of calling
+    // WinUpdateWindow(). The latter tends to skip WM_PAINT messages under the
+    // heavy load of the GUI thread (probably due to the low WM_PAINT priority),
+    // which may cause parts of scrolled areas to look "stuck" (not updated in
+    // time but with some delay).
+    QMSG qmsg;
+    while( WinPeekMsg( 0, &qmsg, NULLHANDLE, WM_PAINT, WM_PAINT, PM_REMOVE ) )
+        WinDispatchMsg( 0, &qmsg );
 }