added SetCriticalWindow() and AllowProcessing(): this allows to freeze all events except those for the specified window

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34861 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/evtloop.h

@@ -38,12 +38,35 @@ public:
     // process a single message
     virtual void ProcessMessage(WXMSG *msg);
 
+    // set the critical window: this is the window such that all the events
+    // except those to this window (and its children) stop to be processed
+    // (typical examples: assert or crash report dialog)
+    //
+    // calling this function with NULL argument restores the normal event
+    // handling
+    static void SetCriticalWindow(wxWindow *win) { ms_winCritical = win; }
+
+    // return true if there is no critical window or if this window is [a child
+    // of] the critical one
+    static bool AllowProcessing(wxWindow *win)
+    {
+        return !ms_winCritical || IsChildOfCriticalWindow(win);
+    }
+
 protected:
-    // should we exit the loop?
-    bool m_shouldExit;
+    // check if the given window is a child of ms_winCritical (which must be
+    // non NULL)
+    static bool IsChildOfCriticalWindow(wxWindow *win);
+
+
+    // critical window or NULL
+    static wxWindow *ms_winCritical;
 
     // the loop exit code
     int m_exitcode;
+
+    // should we exit the loop?
+    bool m_shouldExit;
 };
 
 #endif // _WX_MSW_EVTLOOP_H_