Add Qt destruction signal debugging helper

include/wx/qt/private/utils.h

@@ -24,4 +24,7 @@ void wxMissingImplementation( const char fileName[], unsigned lineNumber,
 #define wxMISSING_FUNCTION() \
     wxMISSING_IMPLEMENTATION( __WXFUNCTION__ )
 
+// global function handle Qt objects destruction (just for debugging now)
+void wxQtHandleDestroyedSignal(QObject *qobj = 0);
+
 #endif // _WX_QT_UTILS_H_

include/wx/qt/private/winevent.h

@@ -13,6 +13,7 @@
 
 #include "wx/window.h"
 #include "wx/qt/private/converter.h"
+#include "wx/qt/private/utils.h"
 
 #include <QtCore/QEvent>
 #include <QtGui/QPaintEvent>
@@ -52,8 +53,12 @@ class wxQtEventSignalHandler : public Widget, public wxQtSignalHandler< Handler
     {
         // Set immediatelly as it is used to check if wxWindow is alive
         wxWindow::QtStoreWindowPointer( this, handler );
-    }
 
+        // Handle QWidget destruction signal AFTER it gets deleted
+        QObject::connect( this, &QObject::destroyed, this,
+                            &wxQtHandleDestroyedSignal );
+
+    }
 
     virtual Handler *GetHandler() const
     {
@@ -316,6 +321,7 @@ class wxQtEventSignalHandler : public Widget, public wxQtSignalHandler< Handler
     virtual void tabletEvent ( QTabletEvent * event ) { }
     virtual bool winEvent ( MSG * message, long * result ) { }
     virtual bool x11Event ( XEvent * event ) { } */
+
 };
 
 #endif

src/qt/utils.cpp

@@ -159,3 +159,10 @@ bool wxLaunchDefaultApplication(const wxString& path, int WXUNUSED( flags ) )
 {
     return QDesktopServices::openUrl( QUrl::fromLocalFile( wxQtConvertString( path ) ) );
 }
+
+// Generic "Slot" to conect destruction signal for debugging purposes:
+void wxQtHandleDestroyedSignal(QObject *qobj)
+{
+   wxLogDebug( wxT("%s was destroyed by Qt. pointer=%p"),
+               QObject::staticMetaObject.className(), qobj );
+}