fix child window redraw glitches during scrolling (bug 1944002)

[wxWidgets.git] / src / msw / tooltip.cpp

diff --git a/src/msw/tooltip.cpp b/src/msw/tooltip.cpp
index 98ef64a1b81f6180fc7c9db8cdb881d04e6c729b..dd3fdd076b086d079ee41fa5d05f4ac46d3484b8 100644 (file)
--- a/src/msw/tooltip.cpp
+++ b/src/msw/tooltip.cpp
@@ -40,6 +40,10 @@
     #define TTTOOLINFO_V1_SIZE 0x28
 #endif
 
+#ifndef TTF_TRANSPARENT
+    #define TTF_TRANSPARENT 0x0100
+#endif
+
 // VZ: normally, the trick with subclassing the tooltip control and processing
 //     TTM_WINDOWFROMPOINT should work but, somehow, it doesn't. I leave the
 //     code here for now (but it's not compiled) in case we need it later.
@@ -90,7 +94,18 @@ public:
         hwnd = hwndOwner;
         uFlags = TTF_IDISHWND;
 
-        uId = (UINT)hwndOwner;
+        // we use TTF_TRANSPARENT to fix a problem which arises at least with
+        // the text controls but may presumably happen with other controls
+        // which display the tooltip at mouse position: it can start flashing
+        // then as the control gets "focus lost" events and dismisses the
+        // tooltip which then reappears because mouse remains hovering over the
+        // control, see SF patch 1821229
+        if ( wxApp::GetComCtl32Version() >= 470 )
+        {
+            uFlags |= TTF_TRANSPARENT;
+        }
+
+        uId = (UINT_PTR)hwndOwner;
     }
 };
 
@@ -359,9 +374,12 @@ void wxToolTip::Add(WXHWND hWnd)
                 }
 
                 // only set a new width if it is bigger than the current setting
-                if (max > SendTooltipMessage(GetToolTipCtrl(), TTM_GETMAXTIPWIDTH, 0))
+                if ( max > SendTooltipMessage(GetToolTipCtrl(),
+                                              TTM_GETMAXTIPWIDTH, 0) )
+                {
                     SendTooltipMessage(GetToolTipCtrl(), TTM_SETMAXTIPWIDTH,
-                                       (void *)max);
+                                       wxUIntToPtr(max));
+                }
             }
             else
 #endif // comctl32.dll >= 4.70