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119 lines
4.4 KiB
C++
119 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "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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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow);
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virtual nsSplittableType GetSplittableType() const;
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virtual void DestroyFrom(nsIFrame* aDestructRoot);
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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;
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virtual nsIFrame* GetNextContinuation() const;
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// Set a previous/next non-fluid continuation.
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NS_IMETHOD SetPrevContinuation(nsIFrame*);
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NS_IMETHOD SetNextContinuation(nsIFrame*);
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// Get the first/last continuation for this frame.
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virtual nsIFrame* GetFirstContinuation() const;
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virtual nsIFrame* GetLastContinuation() const;
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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 { return GetPrevInFlow(); }
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virtual nsIFrame* GetNextInFlowVirtual() const { return GetNextInFlow(); }
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// Set a previous/next fluid continuation.
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NS_IMETHOD SetPrevInFlow(nsIFrame*);
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NS_IMETHOD SetNextInFlow(nsIFrame*);
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// Get the first/last frame in the current flow.
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virtual nsIFrame* GetFirstInFlow() const;
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virtual nsIFrame* GetLastInFlow() const;
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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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#ifdef DEBUG
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virtual void DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent);
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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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