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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/TopDocumentRootScrollerController.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/page/ChromeClient.h" | |
| 12 #include "core/page/scrolling/OverscrollController.h" | |
| 13 #include "core/page/scrolling/ViewportScrollCallback.h" | |
| 14 #include "platform/scroll/ScrollableArea.h" | |
| 15 | |
| 16 namespace blink { | |
| 17 | |
| 18 // static | |
| 19 TopDocumentRootScrollerController* TopDocumentRootScrollerController::create( | |
| 20 Document& document) | |
| 21 { | |
| 22 return new TopDocumentRootScrollerController(document); | |
| 23 } | |
| 24 | |
| 25 TopDocumentRootScrollerController::TopDocumentRootScrollerController( | |
| 26 Document& document) | |
| 27 : RootScrollerController(document) | |
| 28 { | |
| 29 } | |
| 30 | |
| 31 DEFINE_TRACE(TopDocumentRootScrollerController) | |
| 32 { | |
| 33 visitor->trace(m_viewportApplyScroll); | |
| 34 visitor->trace(m_currentViewportApplyScrollHost); | |
| 35 RootScrollerController::trace(visitor); | |
| 36 } | |
| 37 | |
| 38 void TopDocumentRootScrollerController::updateEffectiveRootScroller() | |
| 39 { | |
| 40 RootScrollerController::updateEffectiveRootScroller(); | |
| 41 setViewportApplyScrollOnRootScroller(); | |
| 42 } | |
| 43 | |
| 44 void TopDocumentRootScrollerController::setViewportApplyScrollOnRootScroller() | |
| 45 { | |
| 46 if (!m_viewportApplyScroll || !effectiveRootScroller()) | |
| 47 return; | |
| 48 | |
| 49 ScrollableArea* targetScroller = | |
| 50 scrollableAreaFor(*effectiveRootScroller()); | |
| 51 | |
| 52 if (!targetScroller) | |
| 53 return; | |
| 54 | |
| 55 if (m_currentViewportApplyScrollHost) | |
| 56 m_currentViewportApplyScrollHost->removeApplyScroll(); | |
| 57 | |
| 58 // Use disable-native-scroll since the ViewportScrollCallback needs to | |
| 59 // apply scroll actions both before (TopControls) and after (overscroll) | |
| 60 // scrolling the element so it will apply scroll to the element itself. | |
| 61 effectiveRootScroller()->setApplyScroll( | |
| 62 m_viewportApplyScroll, "disable-native-scroll"); | |
| 63 | |
| 64 m_currentViewportApplyScrollHost = effectiveRootScroller(); | |
| 65 | |
| 66 // Ideally, scroll customization would pass the current element to scroll to | |
| 67 // the apply scroll callback but this doesn't happen today so we set it | |
| 68 // through a back door here. This is also needed by the | |
| 69 // ViewportScrollCallback to swap the target into the layout viewport | |
| 70 // in RootFrameViewport. | |
| 71 m_viewportApplyScroll->setScroller(targetScroller); | |
| 72 } | |
| 73 | |
| 74 void TopDocumentRootScrollerController::didUpdateCompositing() | |
| 75 { | |
| 76 FrameHost* frameHost = m_document->frameHost(); | |
| 77 | |
| 78 // Let the compositor-side counterpart know about this change. | |
| 79 if (frameHost) | |
| 80 frameHost->chromeClient().registerViewportLayers(); | |
| 81 } | |
| 82 | |
| 83 void TopDocumentRootScrollerController::didAttachDocument() | |
| 84 { | |
| 85 FrameHost* frameHost = m_document->frameHost(); | |
| 86 FrameView* frameView = m_document->view(); | |
| 87 | |
| 88 if (!frameHost || !frameView) | |
| 89 return; | |
| 90 | |
| 91 RootFrameViewport* rootFrameViewport = frameView->getRootFrameViewport(); | |
| 92 DCHECK(rootFrameViewport); | |
| 93 | |
| 94 m_viewportApplyScroll = ViewportScrollCallback::create( | |
| 95 &frameHost->topControls(), | |
| 96 &frameHost->overscrollController(), | |
| 97 *rootFrameViewport); | |
| 98 | |
| 99 updateEffectiveRootScroller(); | |
| 100 } | |
| 101 | |
| 102 bool TopDocumentRootScrollerController::isViewportScrollCallback( | |
| 103 const ScrollStateCallback* callback) const | |
| 104 { | |
| 105 if (!callback) | |
| 106 return false; | |
| 107 | |
| 108 return callback == m_viewportApplyScroll.get(); | |
| 109 } | |
| 110 | |
| 111 } // namespace blink | |
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Chromium Code Reviews
Issue 2293903002:
Revert of Split RootScrollerController into top-document and child-document classes (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@rootScrollerIFrames2