cleanup image after application

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

diff --git a/src/msw/listctrl.cpp b/src/msw/listctrl.cpp
index 3c08663e15bf4dbd2d00fd0329db714b9c04b8ff..9d2fc92173833fe96d31e4d8ffa633eb4d9ef33a 100644 (file)
--- a/src/msw/listctrl.cpp
+++ b/src/msw/listctrl.cpp
@@ -1260,7 +1260,6 @@ bool wxListCtrl::DeleteItem(long item)
 // Deletes all items
 bool wxListCtrl::DeleteAllItems()
 {
-    FreeAllInternalData();
     return ListView_DeleteAllItems(GetHwnd()) != 0;
 }
 
@@ -1772,20 +1771,15 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                 break;
 
             case HDN_GETDISPINFOW:
-                {
-                    LPNMHDDISPINFOW info = (LPNMHDDISPINFOW) lParam;
-                    // This is a fix for a strange bug under XP.
-                    // Normally, info->iItem is a valid index, but
-                    // sometimes this is a silly (large) number
-                    // and when we return false via wxControl::MSWOnNotify
-                    // to indicate that it hasn't yet been processed,
-                    // there's a GPF in Windows.
-                    // By returning true here, we avoid further processing
-                    // of this strange message.
-                    if ( (unsigned)info->iItem >= (unsigned)GetColumnCount() )
-                        return true;
-                }
-                // fall through
+                // letting Windows XP handle this message results in mysterious
+                // crashes in comctl32.dll seemingly because of bad message
+                // parameters
+                //
+                // I have no idea what is the real cause of the bug (which is,
+                // just to make things interesting, is impossible to reproduce
+                // reliably) but ignoring all these messages does fix it and
+                // doesn't seem to have any negative consequences
+                return true;
 
             default:
                 return wxControl::MSWOnNotify(idCtrl, lParam, result);
@@ -2175,6 +2169,10 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
             // notifications - this makes deleting all items from a list ctrl
             // much faster
             *result = TRUE;
+
+            // also, we may free all user data now (couldn't do it before as
+            // the user should have access to it in OnDeleteAllItems() handler)
+            FreeAllInternalData();
             return true;
 
         case LVN_ENDLABELEDITA: