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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/dom/IntersectionObservation.h" | 5 #include "core/dom/IntersectionObservation.h" |
6 | 6 |
7 #include "core/dom/ElementRareData.h" | 7 #include "core/dom/ElementRareData.h" |
8 #include "core/dom/IntersectionObserver.h" | 8 #include "core/dom/IntersectionObserver.h" |
9 #include "core/frame/FrameView.h" | 9 #include "core/frame/FrameView.h" |
10 #include "core/layout/LayoutBox.h" | 10 #include "core/layout/LayoutBox.h" |
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117 | 117 |
118 // Clip intersectionRect to FrameView visible area if necessary, and map all
geometry to frame coordinates. | 118 // Clip intersectionRect to FrameView visible area if necessary, and map all
geometry to frame coordinates. |
119 clipToFrameView(geometry); | 119 clipToFrameView(geometry); |
120 | 120 |
121 if (geometry.intersectionRect.size().isZero()) | 121 if (geometry.intersectionRect.size().isZero()) |
122 geometry.intersectionRect = LayoutRect(); | 122 geometry.intersectionRect = LayoutRect(); |
123 | 123 |
124 return true; | 124 return true; |
125 } | 125 } |
126 | 126 |
127 void IntersectionObservation::computeIntersectionObservations(double timestamp) | 127 void IntersectionObservation::computeIntersectionObservations(DOMHighResTimeStam
p timestamp) |
128 { | 128 { |
129 // Pre-oilpan, there will be a delay between the time when the target Elemen
t gets deleted | 129 // Pre-oilpan, there will be a delay between the time when the target Elemen
t gets deleted |
130 // (because its ref count dropped to zero) and when this IntersectionObserva
tion gets | 130 // (because its ref count dropped to zero) and when this IntersectionObserva
tion gets |
131 // deleted (during the next gc run, because the target Element is the only t
hing keeping | 131 // deleted (during the next gc run, because the target Element is the only t
hing keeping |
132 // the IntersectionObservation alive). During that interval, we need to che
ck that m_target | 132 // the IntersectionObservation alive). During that interval, we need to che
ck that m_target |
133 // hasn't been cleared. | 133 // hasn't been cleared. |
134 Element* targetElement = target(); | 134 Element* targetElement = target(); |
135 if (!targetElement || !isActive()) | 135 if (!targetElement || !isActive()) |
136 return; | 136 return; |
137 LayoutObject* targetLayoutObject = targetElement->layoutObject(); | 137 LayoutObject* targetLayoutObject = targetElement->layoutObject(); |
138 // TODO(szager): Support SVG | 138 // TODO(szager): Support SVG |
139 if (!targetLayoutObject || (!targetLayoutObject->isBox() && !targetLayoutObj
ect->isInline())) | 139 if (!targetLayoutObject || (!targetLayoutObject->isBox() && !targetLayoutObj
ect->isInline())) |
140 return; | 140 return; |
141 | 141 |
142 IntersectionGeometry geometry; | 142 IntersectionGeometry geometry; |
143 if (!computeGeometry(geometry)) | 143 if (!computeGeometry(geometry)) |
144 return; | 144 return; |
145 | 145 |
146 float intersectionArea = geometry.intersectionRect.size().width().toFloat()
* geometry.intersectionRect.size().height().toFloat(); | 146 float intersectionArea = geometry.intersectionRect.size().width().toFloat()
* geometry.intersectionRect.size().height().toFloat(); |
147 float targetArea = geometry.targetRect.size().width().toFloat() * geometry.t
argetRect.size().height().toFloat(); | 147 float targetArea = geometry.targetRect.size().width().toFloat() * geometry.t
argetRect.size().height().toFloat(); |
148 if (!targetArea) | 148 if (!targetArea) |
149 return; | 149 return; |
150 float newVisibleRatio = intersectionArea / targetArea; | 150 float newVisibleRatio = intersectionArea / targetArea; |
151 unsigned newThresholdIndex = observer().firstThresholdGreaterThan(newVisible
Ratio); | 151 unsigned newThresholdIndex = observer().firstThresholdGreaterThan(newVisible
Ratio); |
152 IntRect snappedRootBounds = pixelSnappedIntRect(geometry.rootRect); | 152 IntRect snappedRootBounds = pixelSnappedIntRect(geometry.rootRect); |
153 IntRect* rootBoundsPointer = m_shouldReportRootBounds ? &snappedRootBounds :
nullptr; | 153 IntRect* rootBoundsPointer = m_shouldReportRootBounds ? &snappedRootBounds :
nullptr; |
154 if (m_lastThresholdIndex != newThresholdIndex) { | 154 if (m_lastThresholdIndex != newThresholdIndex) { |
155 IntersectionObserverEntry* newEntry = new IntersectionObserverEntry( | 155 IntersectionObserverEntry* newEntry = new IntersectionObserverEntry( |
156 timestamp / 1000.0, | 156 timestamp, |
157 pixelSnappedIntRect(geometry.targetRect), | 157 pixelSnappedIntRect(geometry.targetRect), |
158 rootBoundsPointer, | 158 rootBoundsPointer, |
159 pixelSnappedIntRect(geometry.intersectionRect), | 159 pixelSnappedIntRect(geometry.intersectionRect), |
160 targetElement); | 160 targetElement); |
161 observer().enqueueIntersectionObserverEntry(*newEntry); | 161 observer().enqueueIntersectionObserverEntry(*newEntry); |
162 } | 162 } |
163 setLastThresholdIndex(newThresholdIndex); | 163 setLastThresholdIndex(newThresholdIndex); |
164 } | 164 } |
165 | 165 |
166 void IntersectionObservation::disconnect() | 166 void IntersectionObservation::disconnect() |
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177 m_observer.clear(); | 177 m_observer.clear(); |
178 } | 178 } |
179 | 179 |
180 DEFINE_TRACE(IntersectionObservation) | 180 DEFINE_TRACE(IntersectionObservation) |
181 { | 181 { |
182 visitor->trace(m_observer); | 182 visitor->trace(m_observer); |
183 visitor->trace(m_target); | 183 visitor->trace(m_target); |
184 } | 184 } |
185 | 185 |
186 } // namespace blink | 186 } // namespace blink |
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