mirror of
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256 lines
8.3 KiB
C++
256 lines
8.3 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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#include "nsSplittableFrame.h"
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#include "nsIContent.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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NS_IMPL_FRAMEARENA_HELPERS(nsSplittableFrame)
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NS_IMETHODIMP
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nsSplittableFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsresult rv = nsFrame::Init(aContent, aParent, aPrevInFlow);
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if (aPrevInFlow) {
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// Hook the frame into the flow
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SetPrevInFlow(aPrevInFlow);
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aPrevInFlow->SetNextInFlow(this);
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}
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return rv;
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}
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void
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nsSplittableFrame::DestroyFrom(nsIFrame* aDestructRoot)
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{
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// Disconnect from the flow list
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if (mPrevContinuation || mNextContinuation) {
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RemoveFromFlow(this);
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}
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// Let the base class destroy the frame
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nsFrame::DestroyFrom(aDestructRoot);
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}
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nsSplittableType
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nsSplittableFrame::GetSplittableType() const
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{
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return NS_FRAME_SPLITTABLE;
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}
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nsIFrame* nsSplittableFrame::GetPrevContinuation() const
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{
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return mPrevContinuation;
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}
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NS_METHOD nsSplittableFrame::SetPrevContinuation(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev continuation with incorrect type!");
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NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mPrevContinuation = aFrame;
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RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetNextContinuation() const
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{
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return mNextContinuation;
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}
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NS_METHOD nsSplittableFrame::SetNextContinuation(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a next continuation with incorrect type!");
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NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mNextContinuation = aFrame;
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if (aFrame)
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aFrame->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetFirstContinuation() const
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{
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nsSplittableFrame* firstContinuation = const_cast<nsSplittableFrame*>(this);
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while (firstContinuation->mPrevContinuation) {
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firstContinuation = static_cast<nsSplittableFrame*>(firstContinuation->mPrevContinuation);
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}
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NS_POSTCONDITION(firstContinuation, "illegal state in continuation chain.");
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return firstContinuation;
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}
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nsIFrame* nsSplittableFrame::GetLastContinuation() const
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{
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nsSplittableFrame* lastContinuation = const_cast<nsSplittableFrame*>(this);
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while (lastContinuation->mNextContinuation) {
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lastContinuation = static_cast<nsSplittableFrame*>(lastContinuation->mNextContinuation);
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}
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NS_POSTCONDITION(lastContinuation, "illegal state in continuation chain.");
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return lastContinuation;
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}
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#ifdef DEBUG
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bool nsSplittableFrame::IsInPrevContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
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{
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PRInt32 iterations = 0;
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while (aFrame1 && iterations < 10) {
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// Bail out after 10 iterations so we don't bog down debug builds too much
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if (aFrame1 == aFrame2)
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return true;
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aFrame1 = aFrame1->GetPrevContinuation();
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++iterations;
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}
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return false;
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}
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bool nsSplittableFrame::IsInNextContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
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{
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PRInt32 iterations = 0;
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while (aFrame1 && iterations < 10) {
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// Bail out after 10 iterations so we don't bog down debug builds too much
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if (aFrame1 == aFrame2)
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return true;
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aFrame1 = aFrame1->GetNextContinuation();
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++iterations;
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}
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return false;
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}
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#endif
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nsIFrame* nsSplittableFrame::GetPrevInFlow() const
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{
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return (GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? mPrevContinuation : nsnull;
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}
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NS_METHOD nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev in flow with incorrect type!");
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NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mPrevContinuation = aFrame;
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AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetNextInFlow() const
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{
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return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ?
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mNextContinuation : nsnull;
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}
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NS_METHOD nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
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{
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NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a next in flow with incorrect type!");
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NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
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mNextContinuation = aFrame;
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if (aFrame)
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aFrame->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
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return NS_OK;
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}
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nsIFrame* nsSplittableFrame::GetFirstInFlow() const
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{
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nsSplittableFrame* firstInFlow = const_cast<nsSplittableFrame*>(this);
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while (nsIFrame *prev = firstInFlow->GetPrevInFlow()) {
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firstInFlow = static_cast<nsSplittableFrame*>(prev);
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}
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NS_POSTCONDITION(firstInFlow, "illegal state in flow chain.");
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return firstInFlow;
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}
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nsIFrame* nsSplittableFrame::GetLastInFlow() const
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{
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nsSplittableFrame* lastInFlow = const_cast<nsSplittableFrame*>(this);
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while (nsIFrame* next = lastInFlow->GetNextInFlow()) {
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lastInFlow = static_cast<nsSplittableFrame*>(next);
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}
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NS_POSTCONDITION(lastInFlow, "illegal state in flow chain.");
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return lastInFlow;
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}
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// Remove this frame from the flow. Connects prev in flow and next in flow
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void
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nsSplittableFrame::RemoveFromFlow(nsIFrame* aFrame)
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{
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nsIFrame* prevContinuation = aFrame->GetPrevContinuation();
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nsIFrame* nextContinuation = aFrame->GetNextContinuation();
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// The new continuation is fluid only if the continuation on both sides
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// of the removed frame was fluid
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if (aFrame->GetPrevInFlow() && aFrame->GetNextInFlow()) {
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if (prevContinuation) {
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prevContinuation->SetNextInFlow(nextContinuation);
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}
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if (nextContinuation) {
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nextContinuation->SetPrevInFlow(prevContinuation);
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}
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} else {
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if (prevContinuation) {
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prevContinuation->SetNextContinuation(nextContinuation);
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}
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if (nextContinuation) {
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nextContinuation->SetPrevContinuation(prevContinuation);
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}
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}
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aFrame->SetPrevInFlow(nsnull);
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aFrame->SetNextInFlow(nsnull);
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}
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#ifdef DEBUG
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void
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nsSplittableFrame::DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent)
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{
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nsFrame::DumpBaseRegressionData(aPresContext, out, aIndent);
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if (nsnull != mNextContinuation) {
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IndentBy(out, aIndent);
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fprintf(out, "<next-continuation va=\"%ld\"/>\n", PRUptrdiff(mNextContinuation));
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}
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if (nsnull != mPrevContinuation) {
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IndentBy(out, aIndent);
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fprintf(out, "<prev-continuation va=\"%ld\"/>\n", PRUptrdiff(mPrevContinuation));
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}
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}
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#endif
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