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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/page/scrolling/RootScrollerUtil.h" | 5 #include "core/page/scrolling/RootScrollerUtil.h" |
| 6 | 6 |
| 7 #include "core/dom/Document.h" | 7 #include "core/dom/Document.h" |
| 8 #include "core/dom/Element.h" | 8 #include "core/dom/Element.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" |
| (...skipping 18 matching lines...) Expand all Loading... |
| 29 } | 29 } |
| 30 | 30 |
| 31 if (!element.layoutObject() || !element.layoutObject()->isBox()) | 31 if (!element.layoutObject() || !element.layoutObject()->isBox()) |
| 32 return nullptr; | 32 return nullptr; |
| 33 | 33 |
| 34 return static_cast<PaintInvalidationCapableScrollableArea*>( | 34 return static_cast<PaintInvalidationCapableScrollableArea*>( |
| 35 toLayoutBoxModelObject(element.layoutObject())->getScrollableArea()); | 35 toLayoutBoxModelObject(element.layoutObject())->getScrollableArea()); |
| 36 } | 36 } |
| 37 | 37 |
| 38 PaintLayer* paintLayerForRootScroller(const Element* element) { | 38 PaintLayer* paintLayerForRootScroller(const Element* element) { |
| 39 if (!element || !element->layoutObject()) | 39 if (!element || !element->layoutObject() || !element->layoutObject()->isBox()) |
| 40 return nullptr; | 40 return nullptr; |
| 41 | 41 |
| 42 DCHECK(element->layoutObject()->isBox()); | |
| 43 LayoutBox* box = toLayoutBox(element->layoutObject()); | 42 LayoutBox* box = toLayoutBox(element->layoutObject()); |
| 44 | 43 |
| 45 // If the root scroller is the <html> element we do a bit of a fake out | 44 // If the root scroller is the <html> element we do a bit of a fake out |
| 46 // because while <html> has a PaintLayer, scrolling for it is handled by the | 45 // because while <html> has a PaintLayer, scrolling for it is handled by the |
| 47 // #document's PaintLayer (i.e. the PaintLayerCompositor's root layer). The | 46 // #document's PaintLayer (i.e. the PaintLayerCompositor's root layer). The |
| 48 // reason the root scroller is the <html> layer and not #document is because | 47 // reason the root scroller is the <html> layer and not #document is because |
| 49 // the latter is a Node but not an Element. | 48 // the latter is a Node but not an Element. |
| 50 if (element->isSameNode(element->document().documentElement())) { | 49 if (element->isSameNode(element->document().documentElement())) { |
| 51 if (!box->view()) | 50 if (!box->view()) |
| 52 return nullptr; | 51 return nullptr; |
| 53 return box->view()->layer(); | 52 return box->view()->layer(); |
| 54 } | 53 } |
| 55 | 54 |
| 56 return box->layer(); | 55 return box->layer(); |
| 57 } | 56 } |
| 58 | 57 |
| 59 } // namespace RootScrollerUtil | 58 } // namespace RootScrollerUtil |
| 60 | 59 |
| 61 } // namespace blink | 60 } // namespace blink |
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Chromium Code Reviews
Issue 2531343002:
Don't assume current root scroller is a LayoutBox. (Closed)
