1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "ui/events/event_processor.h" 6 7 #include "ui/events/event_target.h" 8 #include "ui/events/event_targeter.h" 9 10 namespace ui { 11 12 EventDispatchDetails EventProcessor::OnEventFromSource(Event* event) { 13 EventTarget* root = GetRootTarget(); 14 CHECK(root); 15 EventTargeter* targeter = root->GetEventTargeter(); 16 CHECK(targeter); 17 PrepareEventForDispatch(event); 18 19 // If |event| is in the process of being dispatched or has already been 20 // dispatched, then dispatch a copy of the event instead. 21 bool dispatch_original_event = event->phase() == EP_PREDISPATCH; 22 Event* event_to_dispatch = event; 23 scoped_ptr<Event> event_copy; 24 if (!dispatch_original_event) { 25 event_copy = Event::Clone(*event); 26 event_to_dispatch = event_copy.get(); 27 } 28 29 EventTarget* target = targeter->FindTargetForEvent(root, event_to_dispatch); 30 EventDispatchDetails details; 31 while (target) { 32 details = DispatchEvent(target, event_to_dispatch); 33 34 if (!dispatch_original_event) { 35 if (event_to_dispatch->stopped_propagation()) 36 event->StopPropagation(); 37 else if (event_to_dispatch->handled()) 38 event->SetHandled(); 39 } 40 41 if (details.dispatcher_destroyed) 42 return details; 43 44 if (details.target_destroyed || event->handled()) 45 break; 46 47 target = targeter->FindNextBestTarget(target, event_to_dispatch); 48 } 49 50 OnEventProcessingFinished(event); 51 return details; 52 } 53 54 void EventProcessor::PrepareEventForDispatch(Event* event) { 55 } 56 57 void EventProcessor::OnEventProcessingFinished(Event* event) { 58 } 59 60 } // namespace ui 61
