зеркало из https://github.com/mozilla/gecko-dev.git
119 строки
3.9 KiB
C++
119 строки
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* rendering object that is the root of the frame tree, which contains
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* the document's scrollbars and contains fixed-positioned elements
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*/
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#ifndef mozilla_ViewportFrame_h
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#define mozilla_ViewportFrame_h
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#include "mozilla/Attributes.h"
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#include "nsContainerFrame.h"
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class nsPresContext;
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namespace mozilla {
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class ServoRestyleState;
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/**
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* ViewportFrame is the parent of a single child - the doc root frame or a scroll frame
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* containing the doc root frame. ViewportFrame stores this child in its primary child
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* list.
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*/
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class ViewportFrame : public nsContainerFrame {
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public:
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS(ViewportFrame)
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explicit ViewportFrame(nsStyleContext* aContext)
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: ViewportFrame(aContext, kClassID)
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{}
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virtual ~ViewportFrame() { } // useful for debugging
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virtual void Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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#ifdef DEBUG
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virtual void AppendFrames(ChildListID aListID,
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nsFrameList& aFrameList) override;
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virtual void InsertFrames(ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList) override;
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virtual void RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame) override;
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#endif
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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void BuildDisplayListForTopLayer(nsDisplayListBuilder* aBuilder,
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nsDisplayList* aList);
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virtual nscoord GetMinISize(gfxContext *aRenderingContext) override;
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virtual nscoord GetPrefISize(gfxContext *aRenderingContext) override;
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virtual void Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;
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/**
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* Adjust aReflowInput to account for scrollbars and pres shell
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* GetScrollPositionClampingScrollPortSizeSet and
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* GetContentDocumentFixedPositionMargins adjustments.
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* @return the rect to use as containing block rect
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*/
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nsRect AdjustReflowInputAsContainingBlock(ReflowInput* aReflowInput) const;
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/**
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* Update our style (and recursively the styles of any anonymous boxes we
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* might own)
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*/
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void UpdateStyle(ServoRestyleState& aStyleSet);
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/**
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* Return our single anonymous box child.
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*/
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void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override;
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#endif
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protected:
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ViewportFrame(nsStyleContext* aContext, ClassID aID)
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: nsContainerFrame(aContext, aID)
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, mView(nullptr)
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{}
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/**
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* Calculate how much room is available for fixed frames. That means
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* determining if the viewport is scrollable and whether the vertical and/or
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* horizontal scrollbars are visible. Adjust the computed width/height and
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* available width for aReflowInput accordingly.
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* @return the current scroll position, or 0,0 if not scrollable
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*/
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nsPoint AdjustReflowInputForScrollbars(ReflowInput* aReflowInput) const;
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nsView* GetViewInternal() const override { return mView; }
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void SetViewInternal(nsView* aView) override { mView = aView; }
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private:
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virtual mozilla::layout::FrameChildListID GetAbsoluteListID() const override { return kFixedList; }
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nsView* mView;
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};
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} // namespace mozilla
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#endif // mozilla_ViewportFrame_h
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