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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "core/page/scrolling/RootScroller.h" | |
| 6 | |
| 7 #include "core/dom/Document.h" | |
| 8 #include "core/dom/Element.h" | |
| 9 #include "core/frame/FrameHost.h" | |
| 10 #include "core/frame/FrameView.h" | |
| 11 #include "core/frame/TopControls.h" | |
| 12 #include "core/layout/LayoutBox.h" | |
| 13 #include "core/page/Page.h" | |
| 14 #include "core/page/scrolling/OverscrollController.h" | |
| 15 #include "core/page/scrolling/ViewportScrollCallback.h" | |
| 16 #include "core/paint/PaintLayerScrollableArea.h" | |
| 17 #include "platform/scroll/ScrollableArea.h" | |
| 18 | |
| 19 namespace blink { | |
| 20 | |
| 21 namespace { | |
| 22 | |
| 23 ScrollableArea* scrollableAreaFor(const Element& element) | |
| 24 { | |
| 25 if (!element.layoutObject() || !element.layoutObject()->isBox()) | |
| 26 return nullptr; | |
| 27 | |
| 28 LayoutBox* box = toLayoutBox(element.layoutObject()); | |
| 29 | |
| 30 if (box->isDocumentElement()) | |
| 31 return element.document().view()->getScrollableArea(); | |
| 32 | |
| 33 return static_cast<PaintInvalidationCapableScrollableArea*>( | |
| 34 box->getScrollableArea()); | |
| 35 } | |
| 36 | |
| 37 bool fillsViewport(const Element& element) | |
| 38 { | |
| 39 DCHECK(element.layoutObject()); | |
| 40 DCHECK(element.layoutObject()->isBox()); | |
| 41 | |
| 42 LayoutObject* layoutObject = element.layoutObject(); | |
| 43 | |
| 44 // TODO(bokan): Broken for OOPIF. | |
| 45 Document& topDocument = element.document().topDocument(); | |
| 46 | |
| 47 Vector<FloatQuad> quads; | |
| 48 layoutObject->absoluteQuads(quads); | |
| 49 DCHECK_EQ(quads.size(), 1u); | |
| 50 | |
| 51 if (!quads[0].isRectilinear()) | |
| 52 return false; | |
| 53 | |
| 54 LayoutRect boundingBox(quads[0].boundingBox()); | |
| 55 | |
| 56 return boundingBox.location() == LayoutPoint::zero() | |
| 57 && boundingBox.size() == topDocument.layoutViewItem().size(); | |
| 58 } | |
| 59 | |
| 60 bool isValidRootScroller(const Element& element) | |
| 61 { | |
| 62 if (!element.layoutObject()) | |
| 63 return false; | |
| 64 | |
| 65 if (!scrollableAreaFor(element)) | |
| 66 return false; | |
| 67 | |
| 68 if (!fillsViewport(element)) | |
| 69 return false; | |
| 70 | |
| 71 return true; | |
| 72 } | |
| 73 | |
| 74 } // namespace | |
| 75 | |
| 76 ViewportScrollCallback* RootScroller::createViewportApplyScroll( | |
| 77 TopControls& topControls, OverscrollController& overscrollController) | |
| 78 { | |
| 79 return new ViewportScrollCallback(topControls, overscrollController); | |
| 80 } | |
| 81 | |
| 82 RootScroller::RootScroller(Document& document, ViewportScrollCallback* applyScro
llCallback) | |
| 83 : m_document(&document) | |
| 84 , m_viewportApplyScroll(applyScrollCallback) | |
| 85 { | |
| 86 } | |
| 87 | |
| 88 DEFINE_TRACE(RootScroller) | |
| 89 { | |
| 90 visitor->trace(m_document); | |
| 91 visitor->trace(m_viewportApplyScroll); | |
| 92 visitor->trace(m_rootScroller); | |
| 93 visitor->trace(m_effectiveRootScroller); | |
| 94 } | |
| 95 | |
| 96 void RootScroller::set(Element* newRootScroller) | |
| 97 { | |
| 98 m_rootScroller = newRootScroller; | |
| 99 updateEffectiveRootScroller(); | |
| 100 } | |
| 101 | |
| 102 Element* RootScroller::get() const | |
| 103 { | |
| 104 return m_rootScroller; | |
| 105 } | |
| 106 | |
| 107 Element* RootScroller::effectiveRootScroller() const | |
| 108 { | |
| 109 return m_effectiveRootScroller; | |
| 110 } | |
| 111 | |
| 112 void RootScroller::didUpdateLayout() | |
| 113 { | |
| 114 updateEffectiveRootScroller(); | |
| 115 } | |
| 116 | |
| 117 void RootScroller::updateEffectiveRootScroller() | |
| 118 { | |
| 119 bool rootScrollerValid = | |
| 120 m_rootScroller && isValidRootScroller(*m_rootScroller); | |
| 121 | |
| 122 Element* newEffectiveRootScroller = rootScrollerValid | |
| 123 ? m_rootScroller.get() | |
| 124 : defaultEffectiveRootScroller(); | |
| 125 | |
| 126 if (m_effectiveRootScroller == newEffectiveRootScroller) | |
| 127 return; | |
| 128 | |
| 129 moveViewportApplyScroll(newEffectiveRootScroller); | |
| 130 m_effectiveRootScroller = newEffectiveRootScroller; | |
| 131 } | |
| 132 | |
| 133 void RootScroller::moveViewportApplyScroll(Element* target) | |
| 134 { | |
| 135 if (!m_viewportApplyScroll) | |
| 136 return; | |
| 137 | |
| 138 if (m_effectiveRootScroller) | |
| 139 m_effectiveRootScroller->removeApplyScroll(); | |
| 140 | |
| 141 ScrollableArea* targetScroller = | |
| 142 target ? scrollableAreaFor(*target) : nullptr; | |
| 143 | |
| 144 if (targetScroller) { | |
| 145 // Use disable-native-scroll since the ViewportScrollCallback needs to | |
| 146 // apply scroll actions both before (TopControls) and after (overscroll) | |
| 147 // scrolling the element so it will apply scroll to the element itself. | |
| 148 target->setApplyScroll( | |
| 149 m_viewportApplyScroll, | |
| 150 "disable-native-scroll"); | |
| 151 } | |
| 152 | |
| 153 // Ideally, scroll customization would pass the current element to scroll to | |
| 154 // the apply scroll callback but this doesn't happen today so we set it | |
| 155 // through a back door here. | |
| 156 m_viewportApplyScroll->setScroller(targetScroller); | |
| 157 } | |
| 158 | |
| 159 Element* RootScroller::defaultEffectiveRootScroller() | |
| 160 { | |
| 161 DCHECK(m_document); | |
| 162 return m_document->documentElement(); | |
| 163 } | |
| 164 | |
| 165 } // namespace blink | |
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Chromium Code Reviews
Issue 2040693002:
Rename RootScroller class to RootScrollerController. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master