workaround for blocking behaviour under carbon when running in classic

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

diff --git a/src/msw/evtloop.cpp b/src/msw/evtloop.cpp
index 6525319a370ba48da6f0d3c3d5739e5851420006..1909600fa739eaeef56c7a2b9e66c849de3abf3c 100644 (file)
--- a/src/msw/evtloop.cpp
+++ b/src/msw/evtloop.cpp
@@ -41,6 +41,11 @@
 
 #include "wx/msw/private.h"
 
+// For MB_TASKMODAL
+#ifdef __WXWINCE__
+#include "wx/msw/wince/missing.h"
+#endif
+
 #if wxUSE_THREADS
     #include "wx/thread.h"
 
@@ -60,7 +65,7 @@ class WXDLLEXPORT wxEventLoopImpl
 {
 public:
     // ctor
-    wxEventLoopImpl() { SetExitCode(0); }
+    wxEventLoopImpl() { m_exitcode = 0; m_shouldExit = false; }
 
     // process a message
     void ProcessMessage(MSG *msg);
@@ -69,8 +74,16 @@ public:
     bool SendIdleMessage();
 
     // set/get the exit code
-    void SetExitCode(int exitcode) { m_exitcode = exitcode; }
+    void Exit(int exitcode) { m_exitcode = exitcode; m_shouldExit = true; }
     int GetExitCode() const { return m_exitcode; }
+    bool ShouldExit() const { return m_shouldExit; }
+
+    enum wxCatchAllResponse {
+        catch_continue,
+        catch_exit,
+        catch_rethrow
+    };
+    wxCatchAllResponse OnCatchAll();
 
 private:
     // preprocess a message, return TRUE if processed (i.e. no further
@@ -79,6 +92,9 @@ private:
 
     // the exit code of the event loop
     int m_exitcode;
+
+    // true if we were asked to terminate
+    bool m_shouldExit;
 };
 
 // ----------------------------------------------------------------------------
@@ -209,6 +225,25 @@ bool wxEventLoopImpl::SendIdleMessage()
     return wxTheApp->ProcessIdle();
 }
 
+// ----------------------------------------------------------------------------
+// wxEventLoopImpl exception handling
+// ----------------------------------------------------------------------------
+
+wxEventLoopImpl::wxCatchAllResponse wxEventLoopImpl::OnCatchAll()
+{
+    switch (::MessageBox(NULL, 
+            _T("An unhandled exception occurred. 'Abort' will terminate the program,\r\n\
+'Retry' will close the current dialog, 'Ignore' will try to continue."),
+            _T("Unhandled exception"), 
+            MB_ABORTRETRYIGNORE|MB_ICONERROR|MB_TASKMODAL))
+    {
+        case IDABORT: return catch_rethrow;
+        case IDRETRY: return catch_exit;
+        case IDIGNORE: return catch_continue;
+    }
+    return catch_rethrow;
+}
+
 // ============================================================================
 // wxEventLoop implementation
 // ============================================================================
@@ -240,39 +275,71 @@ int wxEventLoop::Run()
     wxEventLoopActivator activate(&ms_activeLoop, this);
     wxEventLoopImplTiedPtr impl(&m_impl, new wxEventLoopImpl);
 
-    class CallEventLoopMethod
-    {
-    public:
-        typedef void (wxEventLoop::*FuncType)();
-
-        CallEventLoopMethod(wxEventLoop *evtLoop, FuncType fn)
-            : m_evtLoop(evtLoop), m_fn(fn) { }
-        ~CallEventLoopMethod() { (m_evtLoop->*m_fn)(); }
-
-    private:
-        wxEventLoop *m_evtLoop;
-        FuncType m_fn;
-    } callOnExit(this, wxEventLoop::OnExit);
-
-    for ( ;; )
+    // 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)
+#if wxUSE_EXCEPTIONS
+    bool retryAfterException = false;
+    do {
+        retryAfterException=false;
+#endif
+    wxTRY
     {
-#if wxUSE_THREADS
-        wxMutexGuiLeaveOrEnter();
-#endif // wxUSE_THREADS
+        for ( ;; )
+        {
+    #if wxUSE_THREADS
+            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() )
+                ;
+
+            // if the "should exit" flag is set, the loop should terminate but
+            // not before processing any remaining messages so while Pending()
+            // returns true, do process them
+            if ( m_impl->ShouldExit() )
+            {
+                while ( Pending() )
+                    Dispatch();
 
-        // generate and process idle events for as long as we don't have
-        // anything else to do
-        while ( !Pending() && m_impl->SendIdleMessage() )
-            ;
+                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;
+            // 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( 
+            switch (m_impl->OnCatchAll()) {
+                case wxEventLoopImpl::catch_continue:
+                    retryAfterException=true;
+                    break;
+                case wxEventLoopImpl::catch_exit:
+                    OnExit();
+                    break;
+                case wxEventLoopImpl::catch_rethrow:
+                    OnExit();
+                    // should be replaced with wx macro, but
+                    // there is none yet. OTOH, wxCATCH_ALL isn't
+                    // expanded unless wxUSE_EXCEPTIONS, so its
+                    // safe to use throw here.
+                    throw;
+                default:
+                    break;
     }
+        )
+#if wxUSE_EXCEPTIONS
+    } while (retryAfterException);
+#endif
 
     return m_impl->GetExitCode();
 }
@@ -281,9 +348,18 @@ void wxEventLoop::Exit(int rc)
 {
     wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") );
 
-    m_impl->SetExitCode(rc);
+    m_impl->Exit(rc);
+
+    OnExit();
 
-    ::PostQuitMessage(rc);
+    // all we have to do to exit from the loop is to (maybe) wake it up so that
+    // it can notice that Exit() had been called
+    //
+    // in particular, we do *not* use PostQuitMessage() here because we're not
+    // sure that WM_QUIT is going to be processed by the correct event loop: it
+    // is possible that another one is started before this one has a chance to
+    // process WM_QUIT
+    ::PostMessage(NULL, WM_NULL, 0, 0);
 }
 
 // ----------------------------------------------------------------------------