1 | /* |
2 | * Copyright (C) 2017 Google Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
14 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
15 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
17 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
18 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
19 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
20 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
21 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
22 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
23 | * THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #include "config.h" |
27 | #include "VisualViewport.h" |
28 | |
29 | #include "ContextDestructionObserver.h" |
30 | #include "DOMWindow.h" |
31 | #include "Document.h" |
32 | #include "DocumentEventQueue.h" |
33 | #include "Event.h" |
34 | #include "EventNames.h" |
35 | #include "Frame.h" |
36 | #include "FrameView.h" |
37 | #include "Page.h" |
38 | #include <wtf/IsoMallocInlines.h> |
39 | |
40 | namespace WebCore { |
41 | |
42 | WTF_MAKE_ISO_ALLOCATED_IMPL(VisualViewport); |
43 | |
44 | VisualViewport::VisualViewport(DOMWindow& window) |
45 | : DOMWindowProperty(&window) |
46 | { |
47 | } |
48 | |
49 | EventTargetInterface VisualViewport::eventTargetInterface() const |
50 | { |
51 | return VisualViewportEventTargetInterfaceType; |
52 | } |
53 | |
54 | ScriptExecutionContext* VisualViewport::scriptExecutionContext() const |
55 | { |
56 | auto window = this->window(); |
57 | if (!window) |
58 | return nullptr; |
59 | return static_cast<ContextDestructionObserver*>(window)->scriptExecutionContext(); |
60 | } |
61 | |
62 | bool VisualViewport::addEventListener(const AtomString& eventType, Ref<EventListener>&& listener, const AddEventListenerOptions& options) |
63 | { |
64 | if (!EventTarget::addEventListener(eventType, WTFMove(listener), options)) |
65 | return false; |
66 | |
67 | if (auto* frame = this->frame()) |
68 | frame->document()->addListenerTypeIfNeeded(eventType); |
69 | return true; |
70 | } |
71 | |
72 | void VisualViewport::updateFrameLayout() const |
73 | { |
74 | ASSERT(frame()); |
75 | frame()->document()->updateLayoutIgnorePendingStylesheets(Document::RunPostLayoutTasks::Synchronously); |
76 | } |
77 | |
78 | double VisualViewport::offsetLeft() const |
79 | { |
80 | if (!frame()) |
81 | return 0; |
82 | |
83 | updateFrameLayout(); |
84 | return m_offsetLeft; |
85 | } |
86 | |
87 | double VisualViewport::offsetTop() const |
88 | { |
89 | if (!frame()) |
90 | return 0; |
91 | |
92 | updateFrameLayout(); |
93 | return m_offsetTop; |
94 | } |
95 | |
96 | double VisualViewport::pageLeft() const |
97 | { |
98 | if (!frame()) |
99 | return 0; |
100 | |
101 | updateFrameLayout(); |
102 | return m_pageLeft; |
103 | } |
104 | |
105 | double VisualViewport::pageTop() const |
106 | { |
107 | if (!frame()) |
108 | return 0; |
109 | |
110 | updateFrameLayout(); |
111 | return m_pageTop; |
112 | } |
113 | |
114 | double VisualViewport::width() const |
115 | { |
116 | if (!frame()) |
117 | return 0; |
118 | |
119 | updateFrameLayout(); |
120 | return m_width; |
121 | } |
122 | |
123 | double VisualViewport::height() const |
124 | { |
125 | if (!frame()) |
126 | return 0; |
127 | |
128 | updateFrameLayout(); |
129 | return m_height; |
130 | } |
131 | |
132 | double VisualViewport::scale() const |
133 | { |
134 | // Subframes always have scale 1 since they aren't scaled relative to their parent frame. |
135 | auto* frame = this->frame(); |
136 | if (!frame || !frame->isMainFrame()) |
137 | return 1; |
138 | |
139 | updateFrameLayout(); |
140 | return m_scale; |
141 | } |
142 | |
143 | void VisualViewport::update() |
144 | { |
145 | double offsetLeft = 0; |
146 | double offsetTop = 0; |
147 | m_pageLeft = 0; |
148 | m_pageTop = 0; |
149 | double width = 0; |
150 | double height = 0; |
151 | double scale = 1; |
152 | |
153 | if (auto* frame = this->frame()) { |
154 | if (auto* view = frame->view()) { |
155 | auto visualViewportRect = view->visualViewportRect(); |
156 | auto layoutViewportRect = view->layoutViewportRect(); |
157 | auto pageZoomFactor = frame->pageZoomFactor(); |
158 | ASSERT(pageZoomFactor); |
159 | offsetLeft = (visualViewportRect.x() - layoutViewportRect.x()) / pageZoomFactor; |
160 | offsetTop = (visualViewportRect.y() - layoutViewportRect.y()) / pageZoomFactor; |
161 | m_pageLeft = visualViewportRect.x() / pageZoomFactor; |
162 | m_pageTop = visualViewportRect.y() / pageZoomFactor; |
163 | width = visualViewportRect.width() / pageZoomFactor; |
164 | height = visualViewportRect.height() / pageZoomFactor; |
165 | } |
166 | if (auto* page = frame->page()) |
167 | scale = page->pageScaleFactor(); |
168 | } |
169 | |
170 | if (m_offsetLeft != offsetLeft || m_offsetTop != offsetTop) { |
171 | enqueueScrollEvent(); |
172 | m_offsetLeft = offsetLeft; |
173 | m_offsetTop = offsetTop; |
174 | } |
175 | if (m_width != width || m_height != height || m_scale != scale) { |
176 | enqueueResizeEvent(); |
177 | m_width = width; |
178 | m_height = height; |
179 | m_scale = scale; |
180 | } |
181 | } |
182 | |
183 | void VisualViewport::enqueueResizeEvent() |
184 | { |
185 | auto* frame = this->frame(); |
186 | if (!frame) |
187 | return; |
188 | |
189 | frame->document()->eventQueue().enqueueResizeEvent(*this, Event::CanBubble::No, Event::IsCancelable::No); |
190 | } |
191 | |
192 | void VisualViewport::enqueueScrollEvent() |
193 | { |
194 | auto* frame = this->frame(); |
195 | if (!frame) |
196 | return; |
197 | |
198 | frame->document()->eventQueue().enqueueScrollEvent(*this, Event::CanBubble::No, Event::IsCancelable::No); |
199 | } |
200 | |
201 | } // namespace WebCore |
202 | |