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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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109 mapRectToDocumentCoordinates(*targetLayoutObject, geometry.targetRect); | 109 mapRectToDocumentCoordinates(*targetLayoutObject, geometry.targetRect); |
110 | 110 |
111 // Map intersectionRect into document coordinates. | 111 // Map intersectionRect into document coordinates. |
112 mapRectToDocumentCoordinates(*rootLayoutObject, geometry.intersectionRect); | 112 mapRectToDocumentCoordinates(*rootLayoutObject, geometry.intersectionRect); |
113 | 113 |
114 // Clip intersectionRect to FrameView visible area if necessary, and map all
geometry to frame coordinates. | 114 // Clip intersectionRect to FrameView visible area if necessary, and map all
geometry to frame coordinates. |
115 clipToFrameView(geometry); | 115 clipToFrameView(geometry); |
116 | 116 |
117 if (geometry.intersectionRect.size().isZero()) | 117 if (geometry.intersectionRect.size().isZero()) |
118 geometry.intersectionRect = LayoutRect(); | 118 geometry.intersectionRect = LayoutRect(); |
119 if (!m_shouldReportRootBounds) | |
120 geometry.rootRect = LayoutRect(); | |
121 | 119 |
122 return true; | 120 return true; |
123 } | 121 } |
124 | 122 |
125 void IntersectionObservation::computeIntersectionObservations(double timestamp) | 123 void IntersectionObservation::computeIntersectionObservations(double timestamp) |
126 { | 124 { |
127 // Pre-oilpan, there will be a delay between the time when the target Elemen
t gets deleted | 125 // Pre-oilpan, there will be a delay between the time when the target Elemen
t gets deleted |
128 // (because its ref count dropped to zero) and when this IntersectionObserva
tion gets | 126 // (because its ref count dropped to zero) and when this IntersectionObserva
tion gets |
129 // deleted (during the next gc run, because the target Element is the only t
hing keeping | 127 // deleted (during the next gc run, because the target Element is the only t
hing keeping |
130 // the IntersectionObservation alive). During that interval, we need to che
ck that m_target | 128 // the IntersectionObservation alive). During that interval, we need to che
ck that m_target |
131 // hasn't been cleared. | 129 // hasn't been cleared. |
132 Element* targetElement = target(); | 130 Element* targetElement = target(); |
133 if (!targetElement || !isActive()) | 131 if (!targetElement || !isActive()) |
134 return; | 132 return; |
135 LayoutObject* targetLayoutObject = targetElement->layoutObject(); | 133 LayoutObject* targetLayoutObject = targetElement->layoutObject(); |
136 // TODO(szager): Support SVG | 134 // TODO(szager): Support SVG |
137 if (!targetLayoutObject || (!targetLayoutObject->isBox() && !targetLayoutObj
ect->isInline())) | 135 if (!targetLayoutObject || (!targetLayoutObject->isBox() && !targetLayoutObj
ect->isInline())) |
138 return; | 136 return; |
139 | 137 |
140 IntersectionGeometry geometry; | 138 IntersectionGeometry geometry; |
141 if (!computeGeometry(geometry)) | 139 if (!computeGeometry(geometry)) |
142 return; | 140 return; |
143 | 141 |
144 float intersectionArea = geometry.intersectionRect.size().width().toFloat()
* geometry.intersectionRect.size().height().toFloat(); | 142 float intersectionArea = geometry.intersectionRect.size().width().toFloat()
* geometry.intersectionRect.size().height().toFloat(); |
145 float targetArea = geometry.targetRect.size().width().toFloat() * geometry.t
argetRect.size().height().toFloat(); | 143 float targetArea = geometry.targetRect.size().width().toFloat() * geometry.t
argetRect.size().height().toFloat(); |
146 if (!targetArea) | 144 if (!targetArea) |
147 return; | 145 return; |
148 float newVisibleRatio = intersectionArea / targetArea; | 146 float newVisibleRatio = intersectionArea / targetArea; |
149 unsigned newThresholdIndex = observer().firstThresholdGreaterThan(newVisible
Ratio); | 147 unsigned newThresholdIndex = observer().firstThresholdGreaterThan(newVisible
Ratio); |
| 148 IntRect snappedRootBounds = pixelSnappedIntRect(geometry.rootRect); |
| 149 IntRect* rootBoundsPointer = m_shouldReportRootBounds ? &snappedRootBounds :
nullptr; |
150 if (m_lastThresholdIndex != newThresholdIndex) { | 150 if (m_lastThresholdIndex != newThresholdIndex) { |
151 IntersectionObserverEntry* newEntry = new IntersectionObserverEntry( | 151 IntersectionObserverEntry* newEntry = new IntersectionObserverEntry( |
152 timestamp / 1000.0, | 152 timestamp / 1000.0, |
153 pixelSnappedIntRect(geometry.targetRect), | 153 pixelSnappedIntRect(geometry.targetRect), |
154 pixelSnappedIntRect(geometry.rootRect), | 154 rootBoundsPointer, |
155 pixelSnappedIntRect(geometry.intersectionRect), | 155 pixelSnappedIntRect(geometry.intersectionRect), |
156 targetElement); | 156 targetElement); |
157 observer().enqueueIntersectionObserverEntry(*newEntry); | 157 observer().enqueueIntersectionObserverEntry(*newEntry); |
158 } | 158 } |
159 setLastThresholdIndex(newThresholdIndex); | 159 setLastThresholdIndex(newThresholdIndex); |
160 } | 160 } |
161 | 161 |
162 void IntersectionObservation::disconnect() | 162 void IntersectionObservation::disconnect() |
163 { | 163 { |
164 IntersectionObserver* observer = m_observer; | 164 IntersectionObserver* observer = m_observer; |
165 clearRootAndRemoveFromTarget(); | 165 clearRootAndRemoveFromTarget(); |
166 observer->removeObservation(*this); | 166 observer->removeObservation(*this); |
167 } | 167 } |
168 | 168 |
169 void IntersectionObservation::clearRootAndRemoveFromTarget() | 169 void IntersectionObservation::clearRootAndRemoveFromTarget() |
170 { | 170 { |
171 if (m_target) | 171 if (m_target) |
172 target()->ensureIntersectionObserverData().removeObservation(observer())
; | 172 target()->ensureIntersectionObserverData().removeObservation(observer())
; |
173 m_observer.clear(); | 173 m_observer.clear(); |
174 } | 174 } |
175 | 175 |
176 DEFINE_TRACE(IntersectionObservation) | 176 DEFINE_TRACE(IntersectionObservation) |
177 { | 177 { |
178 visitor->trace(m_observer); | 178 visitor->trace(m_observer); |
179 visitor->trace(m_target); | 179 visitor->trace(m_target); |
180 } | 180 } |
181 | 181 |
182 } // namespace blink | 182 } // namespace blink |
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