108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 nsViewportFrame_h___
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#define nsViewportFrame_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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/**
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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_TARGET(ViewportFrame)
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS
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explicit ViewportFrame(nsStyleContext* aContext)
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: nsContainerFrame(aContext)
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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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virtual mozilla::WritingMode GetWritingMode() const override
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{
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nsIFrame* firstChild = mFrames.FirstChild();
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if (firstChild) {
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return firstChild->GetWritingMode();
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}
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return nsIFrame::GetWritingMode();
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}
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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(nsRenderingContext *aRenderingContext) override;
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virtual nscoord GetPrefISize(nsRenderingContext *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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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::viewportFrame
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*/
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virtual nsIAtom* GetType() const 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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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override;
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#endif
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private:
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virtual mozilla::layout::FrameChildListID GetAbsoluteListID() const override { return kFixedList; }
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protected:
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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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};
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#endif // nsViewportFrame_h___
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