gecko-dev/layout/generic/nsSplittableFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
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* Version 1.1 (the "License"); you may not use this file except in
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*
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* 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.
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* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either 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
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#include "nsSplittableFrame.h"
#include "nsIContent.h"
#include "nsIPresContext.h"
#include "nsIStyleContext.h"
#include "nsISizeOfHandler.h"
NS_IMETHODIMP
nsSplittableFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* 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::IsSplittable(nsSplittableType& aIsSplittable) const
{
aIsSplittable = NS_FRAME_SPLITTABLE;
return NS_OK;
}
NS_METHOD nsSplittableFrame::GetPrevInFlow(nsIFrame** aPrevInFlow) const
{
*aPrevInFlow = mPrevInFlow;
return NS_OK;
}
NS_METHOD nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
{
mPrevInFlow = aFrame;
return NS_OK;
}
NS_METHOD nsSplittableFrame::GetNextInFlow(nsIFrame** aNextInFlow) const
{
*aNextInFlow = mNextInFlow;
return NS_OK;
}
NS_METHOD nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
{
mNextInFlow = aFrame;
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetFirstInFlow() const
{
nsSplittableFrame* firstInFlow;
nsSplittableFrame* prevInFlow = (nsSplittableFrame*)this;
while (nsnull!=prevInFlow) {
firstInFlow = prevInFlow;
prevInFlow = (nsSplittableFrame*)firstInFlow->mPrevInFlow;
}
NS_POSTCONDITION(nsnull!=firstInFlow, "illegal state in flow chain.");
return firstInFlow;
}
nsIFrame* nsSplittableFrame::GetLastInFlow() const
{
nsSplittableFrame* lastInFlow;
nsSplittableFrame* nextInFlow = (nsSplittableFrame*)this;
while (nsnull!=nextInFlow) {
lastInFlow = nextInFlow;
nextInFlow = (nsSplittableFrame*)lastInFlow->mNextInFlow;
}
NS_POSTCONDITION(nsnull!=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;
nsIFrame* nextInFlow;
aFrame->GetPrevInFlow(&prevInFlow);
aFrame->GetNextInFlow(&nextInFlow);
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(&prevInFlow);
if (prevInFlow) {
prevInFlow->SetNextInFlow(nsnull);
aFrame->SetPrevInFlow(nsnull);
}
}
nsIFrame * nsSplittableFrame::GetPrevInFlow()
{
return mPrevInFlow;
}
nsIFrame * nsSplittableFrame::GetNextInFlow()
{
return mNextInFlow;
}
#ifdef DEBUG
void
nsSplittableFrame::DumpBaseRegressionData(nsIPresContext* 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));
}
}
NS_IMETHODIMP
nsSplittableFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
{
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = sizeof(*this);
return NS_OK;
}
#endif