added OnExit(); made event loop exception safe; added wxModalEvtLoop

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23647 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/evtloop.h

@@ -16,6 +16,8 @@
     #pragma interface "evtloop.h"
 #endif
 
+class WXDLLEXPORT wxEventLoopImpl;
+
 // ----------------------------------------------------------------------------
 // wxEventLoop: a GUI event loop
 // ----------------------------------------------------------------------------
@@ -51,12 +53,48 @@ public:
     static void SetActive(wxEventLoop* loop) { ms_activeLoop = loop; }
 
 protected:
-    // the pointer to the port specific implementation class
-    class WXDLLEXPORT wxEventLoopImpl *m_impl;
+    // this function should be called before the event loop terminates, whether
+    // this happens normally (because of Exit() call) or abnormally (because of
+    // an exception thrown from inside the loop)
+    virtual void OnExit() { }
+
+
     // the pointer to currently active loop
     static wxEventLoop *ms_activeLoop;
 
+    // the pointer to the port specific implementation class
+    wxEventLoopImpl *m_impl;
+
     DECLARE_NO_COPY_CLASS(wxEventLoop)
 };
 
+// ----------------------------------------------------------------------------
+// wxModalEventLoop
+// ----------------------------------------------------------------------------
+
+// this is a naive generic implementation which uses wxWindowDisabler to
+// implement modality, we will surely need platform-specific implementations
+// too, this generic implementation is here only temporarily to see how it
+// works
+class WXDLLEXPORT wxModalEventLoop : public wxEventLoop
+{
+public:
+    wxModalEventLoop(wxWindow *winModal)
+    {
+        m_windowDisabler = new wxWindowDisabler(winModal);
+    }
+
+protected:
+    virtual void OnExit()
+    {
+        delete m_windowDisabler;
+        m_windowDisabler = NULL;
+
+        wxEventLoop::OnExit();
+    }
+
+private:
+    wxWindowDisabler *m_windowDisabler;
+};
+
 #endif // _WX_EVTLOOP_H_