Fixed compilation problem.

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

diff --git a/src/msw/evtloop.cpp b/src/msw/evtloop.cpp
index a36caa946dfa4a1bc8a54bddec951be45fb99661..6c7e74c00ff73d6b30bd763c389c84c00974437b 100644 (file)
--- a/src/msw/evtloop.cpp
+++ b/src/msw/evtloop.cpp
@@ -34,17 +34,23 @@
 #endif //WX_PRECOMP
 
 #include "wx/evtloop.h"
+
 #include "wx/tooltip.h"
+#include "wx/except.h"
+#include "wx/ptr_scpd.h"
 
 #include "wx/msw/private.h"
 
 #if wxUSE_THREADS
+    #include "wx/thread.h"
+
     // define the array of MSG strutures
     WX_DECLARE_OBJARRAY(MSG, wxMsgArray);
-    // VS: this is a bit dirty - it duplicates same declaration in app.cpp
-    //     (and there's no WX_DEFINE_OBJARRAY for that reason - it is already
-    //     defined in app.cpp).
-#endif
+
+    #include "wx/arrimpl.cpp"
+
+    WX_DEFINE_OBJARRAY(wxMsgArray);
+#endif // wxUSE_THREADS
 
 // ----------------------------------------------------------------------------
 // wxEventLoopImpl
@@ -75,6 +81,36 @@ private:
     int m_exitcode;
 };
 
+// ----------------------------------------------------------------------------
+// helper class
+// ----------------------------------------------------------------------------
+
+wxDEFINE_TIED_SCOPED_PTR_TYPE(wxEventLoopImpl);
+
+// this object sets the wxEventLoop given to the ctor as the currently active
+// one and unsets it in its dtor
+class wxEventLoopActivator
+{
+public:
+    wxEventLoopActivator(wxEventLoop **pActive,
+                         wxEventLoop *evtLoop)
+    {
+        m_pActive = pActive;
+        m_evtLoopOld = *pActive;
+        *pActive = evtLoop;
+    }
+
+    ~wxEventLoopActivator()
+    {
+        // restore the previously active event loop
+        *m_pActive = m_evtLoopOld;
+    }
+
+private:
+    wxEventLoop *m_evtLoopOld;
+    wxEventLoop **m_pActive;
+};
+
 // ============================================================================
 // wxEventLoopImpl implementation
 // ============================================================================
@@ -198,38 +234,42 @@ int wxEventLoop::Run()
     // event loops are not recursive, you need to create another loop!
     wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") );
 
-    m_impl = new wxEventLoopImpl;
-    
-    wxEventLoop *oldLoop = ms_activeLoop;
-    ms_activeLoop = this;
-
-    for ( ;; )
+    // SendIdleMessage() and Dispatch() below may throw so the code here should
+    // be exception-safe, hence we must use local objects for all actions we
+    // should undo
+    wxEventLoopActivator activate(&ms_activeLoop, this);
+    wxEventLoopImplTiedPtr impl(&m_impl, new wxEventLoopImpl);
+
+    // we must ensure that OnExit() is called even if an exception is thrown
+    // from inside Dispatch() but we must call it from Exit() in normal
+    // situations because it is supposed to be called synchronously,
+    // wxModalEventLoop depends on this (so we can't just use ON_BLOCK_EXIT or
+    // something similar here)
+    wxTRY
     {
+        for ( ;; )
+        {
 #if wxUSE_THREADS
-        wxMutexGuiLeaveOrEnter();
+            wxMutexGuiLeaveOrEnter();
 #endif // wxUSE_THREADS
 
-        // generate and process idle events for as long as we don't have
-        // anything else to do
-        while ( !Pending() && m_impl->SendIdleMessage() )
-            ;
+            // generate and process idle events for as long as we don't have
+            // anything else to do
+            while ( !Pending() && m_impl->SendIdleMessage() )
+                ;
 
-        // a message came or no more idle processing to do, sit in Dispatch()
-        // waiting for the next message
-        if ( !Dispatch() )
-        {
-            // we got WM_QUIT
-            break;
+            // a message came or no more idle processing to do, sit in
+            // Dispatch() waiting for the next message
+            if ( !Dispatch() )
+            {
+                // we got WM_QUIT
+                break;
+            }
         }
     }
+    wxCATCH_ALL( OnExit(); )
 
-    int exitcode = m_impl->GetExitCode();
-    delete m_impl;
-    m_impl = NULL;
-
-    ms_activeLoop = oldLoop;
-
-    return exitcode;
+    return m_impl->GetExitCode();
 }
 
 void wxEventLoop::Exit(int rc)
@@ -238,6 +278,8 @@ void wxEventLoop::Exit(int rc)
 
     m_impl->SetExitCode(rc);
 
+    OnExit();
+
     ::PostQuitMessage(rc);
 }