Fixed helpview sample and app in binary compatible way by only exiting

on idle (would exit prematurely since help frame doesn't prevent app exit
when still open)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44610 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/html/helpview/helpview.cpp

@@ -43,20 +43,34 @@ class MyApp : public wxApp
         virtual bool OnInit();
         virtual int OnExit();
 
-    private:
-        wxHtmlHelpController *help;
+        /// Respond to idle event
+        void OnIdle(wxIdleEvent& event);
+
+private:
+        bool                    m_exitIfNoMainWindow;
+        wxHtmlHelpController *  help;
+DECLARE_EVENT_TABLE()
 };
 
 
 IMPLEMENT_APP(MyApp)
 
+BEGIN_EVENT_TABLE(MyApp, wxApp)
+    EVT_IDLE(MyApp::OnIdle)
+END_EVENT_TABLE()
 
 bool MyApp::OnInit()
 {
+    m_exitIfNoMainWindow = false;
 #ifdef __WXMOTIF__
     delete wxLog::SetActiveTarget(new wxLogStderr); // So dialog boxes aren't used
 #endif
 
+    // Don't exit on frame deletion, since the help window is programmed
+    // to cause the app to exit even if it is still open. We need to have the app
+    // close by other means.
+    SetExitOnFrameDelete(false);
+
     wxInitAllImageHandlers();
     wxFileSystem::AddHandler(new wxZipFSHandler);
 
@@ -80,10 +94,17 @@ bool MyApp::OnInit()
 #endif
 
     help -> DisplayContents();
+    SetTopWindow(help->GetFrame());
+    m_exitIfNoMainWindow = true;
 
     return true;
 }
 
+void MyApp::OnIdle(wxIdleEvent& event)
+{
+    if (m_exitIfNoMainWindow && !GetTopWindow())
+        ExitMainLoop();
+}
 
 int MyApp::OnExit()
 {