1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * (C) 2001 Dirk Mueller (mueller@kde.org)
5 * Copyright (C) 2004-2017 Apple Inc. All rights reserved.
6 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
7 * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
8 * Copyright (C) 2010, 2011, 2012, 2013 Google Inc. All rights reserved.
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Library General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Library General Public License for more details.
19 *
20 * You should have received a copy of the GNU Library General Public License
21 * along with this library; see the file COPYING.LIB. If not, write to
22 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 * Boston, MA 02110-1301, USA.
24 */
25
26#include "config.h"
27#include "EventDispatcher.h"
28
29#include "CompositionEvent.h"
30#include "EventContext.h"
31#include "EventPath.h"
32#include "Frame.h"
33#include "FrameLoader.h"
34#include "FrameView.h"
35#include "HTMLInputElement.h"
36#include "InputEvent.h"
37#include "KeyboardEvent.h"
38#include "Logging.h"
39#include "MouseEvent.h"
40#include "ScopedEventQueue.h"
41#include "ScriptDisallowedScope.h"
42#include "ShadowRoot.h"
43#include "TextEvent.h"
44#include "TouchEvent.h"
45
46namespace WebCore {
47
48void EventDispatcher::dispatchScopedEvent(Node& node, Event& event)
49{
50 // Need to set the target here so the scoped event queue knows which node to dispatch to.
51 event.setTarget(EventPath::eventTargetRespectingTargetRules(node));
52 ScopedEventQueue::singleton().enqueueEvent(event);
53}
54
55static void callDefaultEventHandlersInBubblingOrder(Event& event, const EventPath& path)
56{
57 if (path.isEmpty())
58 return;
59
60 // Non-bubbling events call only one default event handler, the one for the target.
61 path.contextAt(0).node()->defaultEventHandler(event);
62 ASSERT(!event.defaultPrevented());
63
64 if (event.defaultHandled() || !event.bubbles())
65 return;
66
67 size_t size = path.size();
68 for (size_t i = 1; i < size; ++i) {
69 path.contextAt(i).node()->defaultEventHandler(event);
70 ASSERT(!event.defaultPrevented());
71 if (event.defaultHandled())
72 return;
73 }
74}
75
76static void dispatchEventInDOM(Event& event, const EventPath& path)
77{
78 // Invoke capturing event listeners in the reverse order.
79 for (size_t i = path.size(); i > 0; --i) {
80 const EventContext& eventContext = path.contextAt(i - 1);
81 if (eventContext.currentTarget() == eventContext.target())
82 event.setEventPhase(Event::AT_TARGET);
83 else
84 event.setEventPhase(Event::CAPTURING_PHASE);
85 eventContext.handleLocalEvents(event, EventTarget::EventInvokePhase::Capturing);
86 if (event.propagationStopped())
87 return;
88 }
89
90 // Invoke bubbling event listeners.
91 size_t size = path.size();
92 for (size_t i = 0; i < size; ++i) {
93 const EventContext& eventContext = path.contextAt(i);
94 if (eventContext.currentTarget() == eventContext.target())
95 event.setEventPhase(Event::AT_TARGET);
96 else if (event.bubbles())
97 event.setEventPhase(Event::BUBBLING_PHASE);
98 else
99 continue;
100 eventContext.handleLocalEvents(event, EventTarget::EventInvokePhase::Bubbling);
101 if (event.propagationStopped())
102 return;
103 }
104}
105
106static bool shouldSuppressEventDispatchInDOM(Node& node, Event& event)
107{
108 if (!event.isTrusted())
109 return false;
110
111 auto frame = node.document().frame();
112 if (!frame)
113 return false;
114
115 if (!frame->mainFrame().loader().shouldSuppressTextInputFromEditing())
116 return false;
117
118 if (is<TextEvent>(event)) {
119 auto& textEvent = downcast<TextEvent>(event);
120 return textEvent.isKeyboard() || textEvent.isComposition();
121 }
122
123 return is<CompositionEvent>(event) || is<InputEvent>(event) || is<KeyboardEvent>(event);
124}
125
126void EventDispatcher::dispatchEvent(Node& node, Event& event)
127{
128 ASSERT_WITH_SECURITY_IMPLICATION(ScriptDisallowedScope::InMainThread::isEventDispatchAllowedInSubtree(node));
129
130 LOG(Events, "EventDispatcher::dispatchEvent %s on node %s", event.type().string().utf8().data(), node.nodeName().utf8().data());
131
132 auto protectedNode = makeRef(node);
133 auto protectedView = makeRefPtr(node.document().view());
134
135 EventPath eventPath { node, event };
136
137 ChildNodesLazySnapshot::takeChildNodesLazySnapshot();
138
139 event.resetBeforeDispatch();
140
141 event.setTarget(EventPath::eventTargetRespectingTargetRules(node));
142 if (!event.target())
143 return;
144
145 InputElementClickState clickHandlingState;
146 if (is<HTMLInputElement>(node))
147 downcast<HTMLInputElement>(node).willDispatchEvent(event, clickHandlingState);
148
149 if (shouldSuppressEventDispatchInDOM(node, event))
150 event.stopPropagation();
151
152 if (!event.propagationStopped() && !eventPath.isEmpty()) {
153 event.setEventPath(eventPath);
154 dispatchEventInDOM(event, eventPath);
155 }
156
157 event.resetAfterDispatch();
158
159 if (clickHandlingState.stateful)
160 downcast<HTMLInputElement>(node).didDispatchClickEvent(event, clickHandlingState);
161
162 // Call default event handlers. While the DOM does have a concept of preventing
163 // default handling, the detail of which handlers are called is an internal
164 // implementation detail and not part of the DOM.
165 if (!event.defaultPrevented() && !event.defaultHandled() && !event.isDefaultEventHandlerIgnored()) {
166 // FIXME: Not clear why we need to reset the target for the default event handlers.
167 // We should research this, and remove this code if possible.
168 auto* finalTarget = event.target();
169 event.setTarget(EventPath::eventTargetRespectingTargetRules(node));
170 callDefaultEventHandlersInBubblingOrder(event, eventPath);
171 event.setTarget(finalTarget);
172 }
173}
174
175template<typename T>
176static void dispatchEventWithType(const Vector<T*>& targets, Event& event)
177{
178 ASSERT(targets.size() >= 1);
179 ASSERT(*targets.begin());
180
181 EventPath eventPath { targets };
182 event.setTarget(*targets.begin());
183 event.setEventPath(eventPath);
184 event.resetBeforeDispatch();
185 dispatchEventInDOM(event, eventPath);
186 event.resetAfterDispatch();
187}
188
189void EventDispatcher::dispatchEvent(const Vector<EventTarget*>& targets, Event& event)
190{
191 dispatchEventWithType<EventTarget>(targets, event);
192}
193
194void EventDispatcher::dispatchEvent(const Vector<Element*>& targets, Event& event)
195{
196 dispatchEventWithType<Element>(targets, event);
197}
198
199}
200