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64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "ui/events/event_processor.h"
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#include "ui/events/event_target.h"
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#include "ui/events/event_targeter.h"
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namespace ui {
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EventDispatchDetails EventProcessor::OnEventFromSource(Event* event) {
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EventTarget* root = GetRootTarget();
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CHECK(root);
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EventTargeter* targeter = root->GetEventTargeter();
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CHECK(targeter);
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// If |event| is in the process of being dispatched or has already been
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// dispatched, then dispatch a copy of the event instead.
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bool dispatch_original_event = event->phase() == EP_PREDISPATCH;
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Event* event_to_dispatch = event;
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scoped_ptr<Event> event_copy;
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if (!dispatch_original_event) {
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event_copy = Event::Clone(*event);
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event_to_dispatch = event_copy.get();
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}
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OnEventProcessingStarted(event_to_dispatch);
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EventTarget* target = NULL;
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if (!event_to_dispatch->handled())
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target = targeter->FindTargetForEvent(root, event_to_dispatch);
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EventDispatchDetails details;
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while (target) {
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details = DispatchEvent(target, event_to_dispatch);
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if (!dispatch_original_event) {
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if (event_to_dispatch->stopped_propagation())
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event->StopPropagation();
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else if (event_to_dispatch->handled())
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event->SetHandled();
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}
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if (details.dispatcher_destroyed)
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return details;
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if (details.target_destroyed || event->handled())
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break;
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target = targeter->FindNextBestTarget(target, event_to_dispatch);
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}
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OnEventProcessingFinished(event);
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return details;
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}
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void EventProcessor::OnEventProcessingStarted(Event* event) {
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}
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void EventProcessor::OnEventProcessingFinished(Event* event) {
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}
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} // namespace ui
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