Ensure that validators work even in presence of pushed event handlers.

Call pre-processing hooks for each of the handlers in the chain and not only
the first one. This ensures that a validator (which is invoked during the
pre-processing stage) of a window is used even if a window has an event
handler pushed on top of it.

Closes #12177.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65006 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -3253,11 +3253,19 @@ protected:
     // validators.
     virtual bool TryBefore(wxEvent& event);
 
-    // this one is not a hook but just a helper which looks up the handler in
+    // This one is not a hook but just a helper which looks up the handler in
-    // this object itself called from ProcessEventLocally() and normally
+    // this object itself.
-    // shouldn't be called directly as doing it would ignore any chained event
+    //
-    // handlers
+    // It is called from ProcessEventLocally() and normally shouldn't be called
-    bool TryHere(wxEvent& event);
+    // directly as doing it would ignore any chained event handlers
+    bool TryHereOnly(wxEvent& event);
+
+    // Another helper which simply calls pre-processing hook and then tries to
+    // handle the event at this handler level.
+    bool TryBeforeAndHere(wxEvent& event)
+    {
+        return TryBefore(event) || TryHereOnly(event);
+    }
 
     // this one is called after failing to find the event handle in our own
     // table to give a chance to the other windows to process it

src/common/event.cpp

@@ -1379,7 +1379,7 @@ bool wxEvtHandler::ProcessEvent(wxEvent& event)
     // Short circuit the event processing logic if we're requested to process
     // this event in this handler only, see DoTryChain() for more details.
     if ( event.ShouldProcessOnlyIn(this) )
-        return TryHere(event);
+        return TryBeforeAndHere(event);
 
 
     // Try to process the event in this handler itself.
@@ -1406,23 +1406,11 @@ bool wxEvtHandler::ProcessEvent(wxEvent& event)
 
 bool wxEvtHandler::ProcessEventLocally(wxEvent& event)
 {
-    // First try the hooks which should be called before our own handlers
+    // Try the hooks which should be called before our own handlers and this
-    if ( TryBefore(event) )
+    // handler itself first. Notice that we should not call ProcessEvent() on
-        return true;
+    // this one as we're already called from it, which explains why we do it
-
+    // here and not in DoTryChain()
-    // Then try this handler itself, notice that we should not call
+    return TryBeforeAndHere(event) || DoTryChain(event);
-    // ProcessEvent() on this one as we're already called from it, which
-    // explains why we do it here and not in DoTryChain()
-    if ( TryHere(event) )
-        return true;
-
-    // Finally try the event handlers chained to this one,
-    if ( DoTryChain(event) )
-        return true;
-
-    // And return false to indicate that we didn't find any handler at this
-    // level.
-    return false;
 }
 
 bool wxEvtHandler::DoTryChain(wxEvent& event)
@@ -1434,7 +1422,7 @@ bool wxEvtHandler::DoTryChain(wxEvent& event)
         // ProcessEvent() from which we were called or will be done by it when
         // we return.
         //
-        // However we must call ProcessEvent() and not TryHere() because the
+        // However we must call ProcessEvent() and not TryHereOnly() because the
         // existing code (including some in wxWidgets itself) expects the
         // overridden ProcessEvent() in its custom event handlers pushed on a
         // window to be called.
@@ -1478,7 +1466,7 @@ bool wxEvtHandler::DoTryChain(wxEvent& event)
     return false;
 }
 
-bool wxEvtHandler::TryHere(wxEvent& event)
+bool wxEvtHandler::TryHereOnly(wxEvent& event)
 {
     // If the event handler is disabled it doesn't process any events
     if ( !GetEvtHandlerEnabled() )