зеркало из https://github.com/mozilla/gecko-dev.git
110 строки
3.9 KiB
C++
110 строки
3.9 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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* base class for rendering objects that can be split across lines,
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* columns, or pages
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*/
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#ifndef nsSplittableFrame_h___
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#define nsSplittableFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsFrame.h"
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// Derived class that allows splitting
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class nsSplittableFrame : public nsFrame
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{
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public:
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NS_DECL_FRAMEARENA_HELPERS
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virtual void Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
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virtual nsSplittableType GetSplittableType() const MOZ_OVERRIDE;
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virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
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/*
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* Frame continuations can be either fluid or not:
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* Fluid continuations ("in-flows") are the result of line breaking,
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* column breaking, or page breaking.
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* Other (non-fluid) continuations can be the result of BiDi frame splitting.
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* A "flow" is a chain of fluid continuations.
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*/
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// Get the previous/next continuation, regardless of its type (fluid or non-fluid).
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virtual nsIFrame* GetPrevContinuation() const MOZ_OVERRIDE;
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virtual nsIFrame* GetNextContinuation() const MOZ_OVERRIDE;
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// Set a previous/next non-fluid continuation.
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NS_IMETHOD SetPrevContinuation(nsIFrame*) MOZ_OVERRIDE;
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NS_IMETHOD SetNextContinuation(nsIFrame*) MOZ_OVERRIDE;
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// Get the first/last continuation for this frame.
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virtual nsIFrame* GetFirstContinuation() const MOZ_OVERRIDE;
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virtual nsIFrame* GetLastContinuation() const MOZ_OVERRIDE;
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#ifdef DEBUG
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// Can aFrame2 be reached from aFrame1 by following prev/next continuations?
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static bool IsInPrevContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2);
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static bool IsInNextContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2);
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#endif
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// Get the previous/next continuation, only if it is fluid (an "in-flow").
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nsIFrame* GetPrevInFlow() const;
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nsIFrame* GetNextInFlow() const;
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virtual nsIFrame* GetPrevInFlowVirtual() const MOZ_OVERRIDE { return GetPrevInFlow(); }
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virtual nsIFrame* GetNextInFlowVirtual() const MOZ_OVERRIDE { return GetNextInFlow(); }
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// Set a previous/next fluid continuation.
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NS_IMETHOD SetPrevInFlow(nsIFrame*) MOZ_OVERRIDE;
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NS_IMETHOD SetNextInFlow(nsIFrame*) MOZ_OVERRIDE;
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// Get the first/last frame in the current flow.
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virtual nsIFrame* GetFirstInFlow() const MOZ_OVERRIDE;
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virtual nsIFrame* GetLastInFlow() const MOZ_OVERRIDE;
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// Remove the frame from the flow. Connects the frame's prev-in-flow
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// and its next-in-flow. This should only be called in frame Destroy() methods.
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static void RemoveFromFlow(nsIFrame* aFrame);
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protected:
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nsSplittableFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
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/**
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* Determine the height consumed by our previous-in-flows.
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*
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* @note (bz) This makes laying out a splittable frame with N in-flows
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* O(N^2)! So, use this function with caution and minimize the number
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* of calls to this method.
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*/
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nscoord GetConsumedHeight() const;
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/**
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* Retrieve the effective computed height of this frame, which is the computed
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* height, minus the height consumed by any previous in-flows.
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*/
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nscoord GetEffectiveComputedHeight(const nsHTMLReflowState& aReflowState,
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nscoord aConsumed = NS_INTRINSICSIZE) const;
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/**
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* @see nsIFrame::GetSkipSides()
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* @see nsIFrame::ApplySkipSides()
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*/
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virtual int GetSkipSides(const nsHTMLReflowState* aReflowState = nullptr) const;
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#ifdef DEBUG
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virtual void DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, int32_t aIndent) MOZ_OVERRIDE;
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#endif
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nsIFrame* mPrevContinuation;
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nsIFrame* mNextContinuation;
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};
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#endif /* nsSplittableFrame_h___ */
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