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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" |
| 11 #include "core/layout/LayoutPart.h" |
11 #include "core/layout/LayoutText.h" | 12 #include "core/layout/LayoutText.h" |
12 #include "core/layout/LayoutView.h" | 13 #include "core/layout/LayoutView.h" |
13 #include "core/paint/PaintLayer.h" | 14 #include "core/paint/PaintLayer.h" |
14 | 15 |
15 namespace blink { | 16 namespace blink { |
16 | 17 |
17 IntersectionObservation::IntersectionObservation(IntersectionObserver& observer,
Element& target, bool shouldReportRootBounds) | 18 IntersectionObservation::IntersectionObservation(IntersectionObserver& observer,
Element& target, bool shouldReportRootBounds) |
18 : m_observer(observer) | 19 : m_observer(observer) |
19 , m_target(target.ensureIntersectionObserverData().createWeakPtr(&target)) | 20 , m_target(target.ensureIntersectionObserverData().createWeakPtr(&target)) |
20 , m_active(true) | |
21 , m_shouldReportRootBounds(shouldReportRootBounds) | 21 , m_shouldReportRootBounds(shouldReportRootBounds) |
22 , m_lastThresholdIndex(0) | 22 , m_lastThresholdIndex(0) |
23 { | 23 { |
24 } | 24 } |
25 | 25 |
26 Element* IntersectionObservation::target() const | 26 Element* IntersectionObservation::target() const |
27 { | 27 { |
28 return toElement(m_target.get()); | 28 return toElement(m_target.get()); |
29 } | 29 } |
30 | 30 |
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81 geometry.targetRect.moveBy(-scrollPosition); | 81 geometry.targetRect.moveBy(-scrollPosition); |
82 geometry.intersectionRect.moveBy(-scrollPosition); | 82 geometry.intersectionRect.moveBy(-scrollPosition); |
83 geometry.rootRect.moveBy(-scrollPosition); | 83 geometry.rootRect.moveBy(-scrollPosition); |
84 } | 84 } |
85 | 85 |
86 static void mapRectToDocumentCoordinates(LayoutObject& layoutObject, LayoutRect&
rect) | 86 static void mapRectToDocumentCoordinates(LayoutObject& layoutObject, LayoutRect&
rect) |
87 { | 87 { |
88 rect = LayoutRect(layoutObject.localToAbsoluteQuad(FloatQuad(FloatRect(rect)
), UseTransforms | ApplyContainerFlip | TraverseDocumentBoundaries).boundingBox(
)); | 88 rect = LayoutRect(layoutObject.localToAbsoluteQuad(FloatQuad(FloatRect(rect)
), UseTransforms | ApplyContainerFlip | TraverseDocumentBoundaries).boundingBox(
)); |
89 } | 89 } |
90 | 90 |
| 91 static bool isContainingBlockChainDescendant(LayoutObject* descendant, LayoutObj
ect* ancestor) |
| 92 { |
| 93 LocalFrame* ancestorFrame = ancestor->document().frame(); |
| 94 LocalFrame* descendantFrame = descendant->document().frame(); |
| 95 |
| 96 if (ancestor->isLayoutView()) |
| 97 return descendantFrame && descendantFrame->tree().top() == ancestorFrame
; |
| 98 |
| 99 if (ancestorFrame != descendantFrame) |
| 100 return false; |
| 101 |
| 102 while (descendant && descendant != ancestor) |
| 103 descendant = descendant->containingBlock(); |
| 104 return descendant; |
| 105 } |
| 106 |
91 bool IntersectionObservation::computeGeometry(IntersectionGeometry& geometry) | 107 bool IntersectionObservation::computeGeometry(IntersectionGeometry& geometry) |
92 { | 108 { |
93 ASSERT(m_target); | 109 // Pre-oilpan, there will be a delay between the time when the target Elemen
t gets deleted |
| 110 // (because its ref count dropped to zero) and when this IntersectionObserva
tion gets |
| 111 // deleted (during the next gc run, because the target Element is the only t
hing keeping |
| 112 // the IntersectionObservation alive). During that interval, we need to che
ck that m_target |
| 113 // hasn't been cleared. |
| 114 Element* targetElement = target(); |
| 115 if (!targetElement || !targetElement->inDocument()) |
| 116 return false; |
| 117 LayoutObject* targetLayoutObject = targetElement->layoutObject(); |
| 118 ASSERT(m_observer); |
94 LayoutObject* rootLayoutObject = m_observer->rootLayoutObject(); | 119 LayoutObject* rootLayoutObject = m_observer->rootLayoutObject(); |
95 LayoutObject* targetLayoutObject = target()->layoutObject(); | 120 // TODO(szager): Support SVG |
96 if (!rootLayoutObject->isBoxModelObject()) | 121 if (!targetLayoutObject) |
97 return false; | 122 return false; |
98 if (!targetLayoutObject->isBoxModelObject() && !targetLayoutObject->isText()
) | 123 if (!targetLayoutObject->isBoxModelObject() && !targetLayoutObject->isText()
) |
99 return false; | 124 return false; |
| 125 if (!rootLayoutObject || !rootLayoutObject->isBoxModelObject()) |
| 126 return false; |
| 127 if (!isContainingBlockChainDescendant(targetLayoutObject, rootLayoutObject)) |
| 128 return false; |
100 | 129 |
101 // Initialize targetRect and intersectionRect to bounds of target, in target
's coordinate space. | 130 // Initialize targetRect and intersectionRect to bounds of target, in target
's coordinate space. |
102 initializeGeometry(geometry); | 131 initializeGeometry(geometry); |
103 | 132 |
104 // TODO(szager): Support intersection observations for zero-area targets. F
or now, we just | 133 // TODO(szager): Support intersection observations for zero-area targets. F
or now, we just |
105 // punt on the observation. | 134 // punt on the observation. |
106 if (!geometry.targetRect.size().width() || !geometry.targetRect.size().heigh
t()) | 135 if (!geometry.targetRect.size().width() || !geometry.targetRect.size().heigh
t()) |
107 return false; | 136 return false; |
108 | 137 |
109 // Clip intersectionRect to the root, and map it to root coordinates. | 138 // Clip intersectionRect to the root, and map it to root coordinates. |
110 clipToRoot(geometry.intersectionRect); | 139 clipToRoot(geometry.intersectionRect); |
111 | 140 |
112 // Map targetRect into document coordinates. | 141 // Map targetRect into document coordinates. |
113 mapRectToDocumentCoordinates(*targetLayoutObject, geometry.targetRect); | 142 mapRectToDocumentCoordinates(*targetLayoutObject, geometry.targetRect); |
114 | 143 |
115 // Map intersectionRect into document coordinates. | 144 // Map intersectionRect into document coordinates. |
116 mapRectToDocumentCoordinates(*rootLayoutObject, geometry.intersectionRect); | 145 mapRectToDocumentCoordinates(*rootLayoutObject, geometry.intersectionRect); |
117 | 146 |
118 // Clip intersectionRect to FrameView visible area if necessary, and map all
geometry to frame coordinates. | 147 // Clip intersectionRect to FrameView visible area if necessary, and map all
geometry to frame coordinates. |
119 clipToFrameView(geometry); | 148 clipToFrameView(geometry); |
120 | 149 |
121 if (geometry.intersectionRect.size().isZero()) | 150 if (geometry.intersectionRect.size().isZero()) |
122 geometry.intersectionRect = LayoutRect(); | 151 geometry.intersectionRect = LayoutRect(); |
123 | 152 |
124 return true; | 153 return true; |
125 } | 154 } |
126 | 155 |
127 void IntersectionObservation::computeIntersectionObservations(DOMHighResTimeStam
p timestamp) | 156 void IntersectionObservation::computeIntersectionObservations(DOMHighResTimeStam
p timestamp) |
128 { | 157 { |
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 | |
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 | |
133 // hasn't been cleared. | |
134 Element* targetElement = target(); | |
135 if (!targetElement || !isActive()) | |
136 return; | |
137 LayoutObject* targetLayoutObject = targetElement->layoutObject(); | |
138 // TODO(szager): Support SVG | |
139 if (!targetLayoutObject || (!targetLayoutObject->isBox() && !targetLayoutObj
ect->isInline())) | |
140 return; | |
141 | |
142 IntersectionGeometry geometry; | 158 IntersectionGeometry geometry; |
143 if (!computeGeometry(geometry)) | 159 if (!computeGeometry(geometry)) |
144 return; | 160 return; |
145 | 161 |
146 float intersectionArea = geometry.intersectionRect.size().width().toFloat()
* geometry.intersectionRect.size().height().toFloat(); | 162 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(); | 163 float targetArea = geometry.targetRect.size().width().toFloat() * geometry.t
argetRect.size().height().toFloat(); |
148 if (!targetArea) | 164 if (!targetArea) |
149 return; | 165 return; |
150 float newVisibleRatio = intersectionArea / targetArea; | 166 float newVisibleRatio = intersectionArea / targetArea; |
151 unsigned newThresholdIndex = observer().firstThresholdGreaterThan(newVisible
Ratio); | 167 unsigned newThresholdIndex = observer().firstThresholdGreaterThan(newVisible
Ratio); |
152 IntRect snappedRootBounds = pixelSnappedIntRect(geometry.rootRect); | 168 IntRect snappedRootBounds = pixelSnappedIntRect(geometry.rootRect); |
153 IntRect* rootBoundsPointer = m_shouldReportRootBounds ? &snappedRootBounds :
nullptr; | 169 IntRect* rootBoundsPointer = m_shouldReportRootBounds ? &snappedRootBounds :
nullptr; |
154 if (m_lastThresholdIndex != newThresholdIndex) { | 170 if (m_lastThresholdIndex != newThresholdIndex) { |
155 IntersectionObserverEntry* newEntry = new IntersectionObserverEntry( | 171 IntersectionObserverEntry* newEntry = new IntersectionObserverEntry( |
156 timestamp, | 172 timestamp, |
157 pixelSnappedIntRect(geometry.targetRect), | 173 pixelSnappedIntRect(geometry.targetRect), |
158 rootBoundsPointer, | 174 rootBoundsPointer, |
159 pixelSnappedIntRect(geometry.intersectionRect), | 175 pixelSnappedIntRect(geometry.intersectionRect), |
160 targetElement); | 176 target()); |
161 observer().enqueueIntersectionObserverEntry(*newEntry); | 177 observer().enqueueIntersectionObserverEntry(*newEntry); |
162 } | 178 } |
163 setLastThresholdIndex(newThresholdIndex); | 179 setLastThresholdIndex(newThresholdIndex); |
164 } | 180 } |
165 | 181 |
166 void IntersectionObservation::disconnect() | 182 void IntersectionObservation::disconnect() |
167 { | 183 { |
168 IntersectionObserver* observer = m_observer; | 184 IntersectionObserver* observer = m_observer; |
169 clearRootAndRemoveFromTarget(); | 185 clearRootAndRemoveFromTarget(); |
170 observer->removeObservation(*this); | 186 observer->removeObservation(*this); |
171 } | 187 } |
172 | 188 |
173 void IntersectionObservation::clearRootAndRemoveFromTarget() | 189 void IntersectionObservation::clearRootAndRemoveFromTarget() |
174 { | 190 { |
175 if (m_target) | 191 if (m_target) |
176 target()->ensureIntersectionObserverData().removeObservation(observer())
; | 192 target()->ensureIntersectionObserverData().removeObservation(observer())
; |
177 m_observer.clear(); | 193 m_observer.clear(); |
178 } | 194 } |
179 | 195 |
180 DEFINE_TRACE(IntersectionObservation) | 196 DEFINE_TRACE(IntersectionObservation) |
181 { | 197 { |
182 visitor->trace(m_observer); | 198 visitor->trace(m_observer); |
183 visitor->trace(m_target); | 199 visitor->trace(m_target); |
184 } | 200 } |
185 | 201 |
186 } // namespace blink | 202 } // namespace blink |
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