New eventb based Drag interface for wxDataViewCtrl

[wxWidgets.git] / include / wx / event.h

diff --git a/include/wx/event.h b/include/wx/event.h
index a4d22914f7f648a6f2436118bdcc266dd441153d..42c5406b1398372c6c3e48f4d27449be8f3b3a0f 100644 (file)
--- a/include/wx/event.h
+++ b/include/wx/event.h
@@ -94,6 +94,11 @@ typedef int wxEventType;
 // generate a new unique event type
 extern WXDLLIMPEXP_BASE wxEventType wxNewEventType();
 
+// FIXME: currently the new events code is disabled because it creates too
+//        many problems, it should be reenabled a.s.a.p. or removed
+#undef wxEVENTS_COMPATIBILITY_2_8
+#define wxEVENTS_COMPATIBILITY_2_8 1
+
 // macros to create an event type depending on whether type safe events are
 // enabled.
 
@@ -105,10 +110,10 @@ extern WXDLLIMPEXP_BASE wxEventType wxNewEventType();
         extern const expdecl wxEventType name;
 
     #define wxDEFINE_EVENT_REFERENCE( name, type, value ) \
-        const wxEventType &name( value );
+        const wxEventType& name = value;
 
     #define wxDECLARE_EXPORTED_EVENT_REFERENCE( expdecl, name, type ) \
-        extern const expdecl wxEventType &name;
+        extern const expdecl wxEventType& name;
 
     #define wxDECLARE_LOCAL_EVENT( name, type ) \
         wxDECLARE_EXPORTED_EVENT( wxEMPTY_PARAMETER_VALUE, name, type )
@@ -244,18 +249,19 @@ private:
     wxObjectEventFunction m_method;
 };
 
-// Create a functor for the legacy events: handler can be NULL 
+// Create a functor for the legacy events: handler can be NULL and its default
+// value is used by the event table macros
 
 inline wxObjectEventFunctor *
-wxNewEventFunctor(wxEventType WXUNUSED(evtType),
+wxNewEventFunctor(const wxEventType& WXUNUSED(evtType),
                   wxObjectEventFunction method,
-                  wxEvtHandler *handler)
+                  wxEvtHandler *handler = NULL)
 {
     return new wxObjectEventFunctor(method, handler);
 }
 
 inline wxObjectEventFunctor
-wxConstructEventFunctor(wxEventType WXUNUSED(evtType),
+wxConstructEventFunctor(const wxEventType& WXUNUSED(evtType),
                         wxObjectEventFunction method,
                         wxEvtHandler *handler)
 {
@@ -712,7 +718,7 @@ public:
     void Skip(bool skip = true) { m_skipped = skip; }
     bool GetSkipped() const { return m_skipped; }
 
-    // this function is used to create a copy of the event polymorphically and
+    // This function is used to create a copy of the event polymorphically and
     // all derived classes must implement it because otherwise wxPostEvent()
     // for them wouldn't work (it needs to do a copy of the event)
     virtual wxEvent *Clone() const = 0;
@@ -741,6 +747,20 @@ public:
         m_propagationLevel = propagationLevel;
     }
 
+
+    // This is for internal use only and is only called by
+    // wxEvtHandler::ProcessEvent() to check whether it's the first time this
+    // event is being processed
+    bool WasProcessed()
+    {
+        if ( m_wasProcessed )
+            return true;
+
+        m_wasProcessed = true;
+
+        return false;
+    }
+
 protected:
     wxObject*         m_eventObject;
     wxEventType       m_eventType;
@@ -762,6 +782,12 @@ protected:
     bool              m_skipped;
     bool              m_isCommandEvent;
 
+    // initially false but becomes true as soon as WasProcessed() is called for
+    // the first time, as this is done only by ProcessEvent() it explains the
+    // variable name: it becomes true after ProcessEvent() was called at least
+    // once for this event
+    bool m_wasProcessed;
+
 protected:
     wxEvent(const wxEvent&);            // for implementing Clone()
     wxEvent& operator=(const wxEvent&); // for derived classes operator=()
@@ -3075,12 +3101,7 @@ public:
     void OnSinkDestroyed( wxEvtHandler *sink );
 
 
-    // The method processing the event in this event handler (or rather in this
-    // event handler chain as it also tries the next handler and so on), i.e.
-    // it returns true if we processed this event or false if we didn't but
-    // does not call TryParent() in the latter case. It also doesn't call
-    // wxApp::FilterEvent() before processing it, this is supposed to be done
-    // by the public ProcessEvent() only once for every event we handle.
+    // The method tries to process the event in this event handler.
     //
     // It is meant to be called from ProcessEvent() only and is not virtual,
     // additional event handlers can be hooked into the normal event processing