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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2016 Apple Inc. All rights reserved.
* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2010, 2011, 2012, 2013 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "EventDispatcher.h"
#include "CompositionEvent.h"
#include "EventContext.h"
#include "EventPath.h"
#include "Frame.h"
#include "FrameView.h"
#include "HTMLInputElement.h"
#include "InputEvent.h"
#include "KeyboardEvent.h"
#include "MainFrame.h"
#include "MouseEvent.h"
#include "NoEventDispatchAssertion.h"
#include "ScopedEventQueue.h"
#include "ShadowRoot.h"
#include "TextEvent.h"
#include "TouchEvent.h"
namespace WebCore {
void EventDispatcher::dispatchScopedEvent(Node& node, Event& event)
{
// We need to set the target here because it can go away by the time we actually fire the event.
event.setTarget(EventPath::eventTargetRespectingTargetRules(node));
ScopedEventQueue::singleton().enqueueEvent(event);
}
static void callDefaultEventHandlersInTheBubblingOrder(Event& event, const EventPath& path)
{
if (path.isEmpty())
return;
// Non-bubbling events call only one default event handler, the one for the target.
path.contextAt(0).node()->defaultEventHandler(event);
ASSERT(!event.defaultPrevented());
if (event.defaultHandled() || !event.bubbles())
return;
size_t size = path.size();
for (size_t i = 1; i < size; ++i) {
path.contextAt(i).node()->defaultEventHandler(event);
ASSERT(!event.defaultPrevented());
if (event.defaultHandled())
return;
}
}
static void dispatchEventInDOM(Event& event, const EventPath& path)
{
// Trigger capturing event handlers, starting at the top and working our way down.
event.setEventPhase(Event::CAPTURING_PHASE);
for (size_t i = path.size() - 1; i > 0; --i) {
const EventContext& eventContext = path.contextAt(i);
if (eventContext.currentTargetSameAsTarget())
continue;
eventContext.handleLocalEvents(event);
if (event.propagationStopped())
return;
}
event.setEventPhase(Event::AT_TARGET);
path.contextAt(0).handleLocalEvents(event);
if (event.propagationStopped())
return;
// Trigger bubbling event handlers, starting at the bottom and working our way up.
size_t size = path.size();
for (size_t i = 1; i < size; ++i) {
const EventContext& eventContext = path.contextAt(i);
if (eventContext.currentTargetSameAsTarget())
event.setEventPhase(Event::AT_TARGET);
else if (event.bubbles())
event.setEventPhase(Event::BUBBLING_PHASE);
else
continue;
eventContext.handleLocalEvents(event);
if (event.propagationStopped())
return;
}
}
static bool shouldSuppressEventDispatchInDOM(Node& node, Event& event)
{
if (!event.isTrusted())
return false;
auto frame = node.document().frame();
if (!frame)
return false;
if (!frame->mainFrame().loader().shouldSuppressKeyboardInput())
return false;
if (is<TextEvent>(event)) {
auto& textEvent = downcast<TextEvent>(event);
return textEvent.isKeyboard() || textEvent.isComposition();
}
return is<CompositionEvent>(event) || is<InputEvent>(event) || is<KeyboardEvent>(event);
}
bool EventDispatcher::dispatchEvent(Node& node, Event& event)
{
ASSERT_WITH_SECURITY_IMPLICATION(NoEventDispatchAssertion::isEventAllowedInMainThread());
Ref<Node> protectedNode(node);
RefPtr<FrameView> view = node.document().view();
EventPath eventPath(node, event);
if (EventTarget* relatedTarget = event.relatedTarget())
eventPath.setRelatedTarget(node, *relatedTarget);
#if ENABLE(TOUCH_EVENTS)
if (is<TouchEvent>(event))
eventPath.retargetTouchLists(downcast<TouchEvent>(event));
#endif
ChildNodesLazySnapshot::takeChildNodesLazySnapshot();
EventTarget* target = EventPath::eventTargetRespectingTargetRules(node);
event.setTarget(target);
if (!event.target())
return true;
ASSERT_WITH_SECURITY_IMPLICATION(NoEventDispatchAssertion::isEventAllowedInMainThread());
InputElementClickState clickHandlingState;
if (is<HTMLInputElement>(node))
downcast<HTMLInputElement>(node).willDispatchEvent(event, clickHandlingState);
if (shouldSuppressEventDispatchInDOM(node, event))
event.stopPropagation();
if (!event.propagationStopped() && !eventPath.isEmpty()) {
event.setEventPath(eventPath);
dispatchEventInDOM(event, eventPath);
event.clearEventPath();
}
auto* finalTarget = event.target();
event.setTarget(EventPath::eventTargetRespectingTargetRules(node));
event.setCurrentTarget(nullptr);
event.resetPropagationFlags();
event.setEventPhase(Event::NONE);
if (clickHandlingState.stateful)
downcast<HTMLInputElement>(node).didDispatchClickEvent(event, clickHandlingState);
// Call default event handlers. While the DOM does have a concept of preventing
// default handling, the detail of which handlers are called is an internal
// implementation detail and not part of the DOM.
if (!event.defaultPrevented() && !event.defaultHandled())
callDefaultEventHandlersInTheBubblingOrder(event, eventPath);
event.setTarget(finalTarget);
event.setCurrentTarget(nullptr);
return !event.defaultPrevented();
}
}
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