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| 1 // Copyright 2015 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 "web/ResizeViewportAnchor.h" | |
| 6 | |
| 7 #include "core/frame/FrameView.h" | |
| 8 #include "core/frame/RootFrameViewport.h" | |
| 9 #include "core/frame/VisualViewport.h" | |
| 10 #include "core/page/Page.h" | |
| 11 #include "platform/geometry/DoubleRect.h" | |
| 12 #include "platform/geometry/FloatSize.h" | |
| 13 | |
| 14 namespace blink { | |
| 15 | |
| 16 void ResizeViewportAnchor::ResizeFrameView(IntSize size) { | |
| 17 FrameView* frame_view = RootFrameView(); | |
| 18 DCHECK(frame_view); | |
| 19 | |
| 20 ScrollableArea* root_viewport = frame_view->GetScrollableArea(); | |
| 21 ScrollOffset offset = root_viewport->GetScrollOffset(); | |
| 22 | |
| 23 frame_view->Resize(size); | |
| 24 drift_ += root_viewport->GetScrollOffset() - offset; | |
| 25 } | |
| 26 | |
| 27 void ResizeViewportAnchor::EndScope() { | |
| 28 if (--scope_count_ > 0) | |
| 29 return; | |
| 30 | |
| 31 FrameView* frame_view = RootFrameView(); | |
| 32 if (!frame_view) | |
| 33 return; | |
| 34 | |
| 35 ScrollOffset visual_viewport_in_document = | |
| 36 frame_view->GetScrollableArea()->GetScrollOffset() - drift_; | |
| 37 | |
| 38 // TODO(bokan): Don't use RootFrameViewport::setScrollPosition since it | |
| 39 // assumes we can just set a sub-pixel precision offset on the FrameView. | |
| 40 // While we "can" do this, the offset that will be shipped to CC will be the | |
| 41 // truncated number and this class is used to handle TopControl movement | |
| 42 // which needs the two threads to match exactly pixel-for-pixel. We can | |
| 43 // replace this with RFV::setScrollPosition once Blink is sub-pixel scroll | |
| 44 // offset aware. crbug.com/414283. | |
| 45 DCHECK(frame_view->GetRootFrameViewport()); | |
| 46 frame_view->GetRootFrameViewport()->RestoreToAnchor( | |
| 47 visual_viewport_in_document); | |
| 48 | |
| 49 drift_ = ScrollOffset(); | |
| 50 } | |
| 51 | |
| 52 FrameView* ResizeViewportAnchor::RootFrameView() { | |
| 53 if (Frame* frame = page_->MainFrame()) { | |
| 54 if (frame->IsLocalFrame()) | |
| 55 return ToLocalFrame(frame)->View(); | |
| 56 } | |
| 57 return nullptr; | |
| 58 } | |
| 59 | |
| 60 } // namespace blink | |
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Chromium Code Reviews
Issue 2837503002:
Move (Resize|Rotation)ViewportAnchor.* from web/ to core/frame/. (Closed)
