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https://github.com/mozilla/gecko-dev.git
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ab931a1326
Note that nsMathMLContainerFrame and its subclasses are unchanged since they are not target of fullscreen (and thus no backdrop frame), and they have an assertion to ensure we really don't pass any unexpected list in. --HG-- extra : source : a1f7ff18a69cc116120de33f14ae62f576a4b55a
111 lines
3.8 KiB
C++
111 lines
3.8 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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typedef nsContainerFrame Super;
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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 nsRect& aDirtyRect,
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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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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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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 UpdateOverflow() override;
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/**
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* Adjust aReflowState 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 AdjustReflowStateAsContainingBlock(nsHTMLReflowState* aReflowState) 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 aReflowState 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 AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const;
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};
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#endif // nsViewportFrame_h___
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