gecko-dev/layout/generic/nsSplittableFrame.cpp

169 строки
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsSplittableFrame.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
NS_IMETHODIMP
nsSplittableFrame::Init(nsPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv;
rv = nsFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
if (aPrevInFlow) {
// Hook the frame into the flow
mPrevInFlow = aPrevInFlow;
aPrevInFlow->SetNextInFlow(this);
}
return rv;
}
NS_IMETHODIMP
nsSplittableFrame::Destroy(nsPresContext* aPresContext)
{
// Disconnect from the flow list
if (mPrevInFlow || mNextInFlow) {
RemoveFromFlow(this);
}
// Let the base class destroy the frame
return nsFrame::Destroy(aPresContext);
}
NS_IMETHODIMP
nsSplittableFrame::IsSplittable(nsSplittableType& aIsSplittable) const
{
aIsSplittable = NS_FRAME_SPLITTABLE;
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetPrevInFlow() const
{
return mPrevInFlow;
}
NS_METHOD nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
{
mPrevInFlow = aFrame;
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetNextInFlow() const
{
return mNextInFlow;
}
NS_METHOD nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
{
mNextInFlow = aFrame;
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetFirstInFlow() const
{
nsSplittableFrame* firstInFlow = (nsSplittableFrame*)this;
while (firstInFlow->mPrevInFlow) {
firstInFlow = (nsSplittableFrame*)firstInFlow->mPrevInFlow;
}
NS_POSTCONDITION(firstInFlow, "illegal state in flow chain.");
return firstInFlow;
}
nsIFrame* nsSplittableFrame::GetLastInFlow() const
{
nsSplittableFrame* lastInFlow = (nsSplittableFrame*)this;
while (lastInFlow->mNextInFlow) {
lastInFlow = (nsSplittableFrame*)lastInFlow->mNextInFlow;
}
NS_POSTCONDITION(lastInFlow, "illegal state in flow chain.");
return lastInFlow;
}
// Remove this frame from the flow. Connects prev in flow and next in flow
void
nsSplittableFrame::RemoveFromFlow(nsIFrame* aFrame)
{
nsIFrame* prevInFlow = aFrame->GetPrevInFlow();
nsIFrame* nextInFlow = aFrame->GetNextInFlow();
if (prevInFlow) {
prevInFlow->SetNextInFlow(nextInFlow);
}
if (nextInFlow) {
nextInFlow->SetPrevInFlow(prevInFlow);
}
aFrame->SetPrevInFlow(nsnull);
aFrame->SetNextInFlow(nsnull);
}
// Detach from previous frame in flow
void
nsSplittableFrame::BreakFromPrevFlow(nsIFrame* aFrame)
{
nsIFrame* prevInFlow = aFrame->GetPrevInFlow();
if (prevInFlow) {
prevInFlow->SetNextInFlow(nsnull);
aFrame->SetPrevInFlow(nsnull);
}
}
#ifdef DEBUG
void
nsSplittableFrame::DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent, PRBool aIncludeStyleData)
{
nsFrame::DumpBaseRegressionData(aPresContext, out, aIndent, aIncludeStyleData);
if (nsnull != mNextInFlow) {
IndentBy(out, aIndent);
fprintf(out, "<next-in-flow va=\"%ld\"/>\n", PRUptrdiff(mNextInFlow));
}
if (nsnull != mPrevInFlow) {
IndentBy(out, aIndent);
fprintf(out, "<prev-in-flow va=\"%ld\"/>\n", PRUptrdiff(mPrevInFlow));
}
}
#endif