pjs/layout/generic/nsFirstLetterFrame.cpp

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Исходник Обычный вид История

/* -*- 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
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*
* 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/
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*
* 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.
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*
* The Original Code is Mozilla Communicator client 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 ***** */
/* rendering object for CSS :first-letter pseudo-element */
#include "nsCOMPtr.h"
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#include "nsHTMLContainerFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsIContent.h"
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#include "nsLineLayout.h"
#include "nsHTMLAtoms.h"
#include "nsLayoutAtoms.h"
#include "nsAutoPtr.h"
#include "nsStyleSet.h"
#include "nsFrameManager.h"
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#define nsFirstLetterFrameSuper nsHTMLContainerFrame
class nsFirstLetterFrame : public nsFirstLetterFrameSuper {
public:
nsFirstLetterFrame(nsStyleContext* aContext) : nsHTMLContainerFrame(aContext) {}
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
nsIFrame* aPrevInFlow);
NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
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nsIFrame* aChildList);
#ifdef NS_DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
virtual nsIAtom* GetType() const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
NS_IMETHOD CanContinueTextRun(PRBool& aContinueTextRun) const;
NS_IMETHOD SetSelected(nsPresContext* aPresContext, nsIDOMRange *aRange,PRBool aSelected, nsSpread aSpread);
//override of nsFrame method
NS_IMETHOD GetChildFrameContainingOffset(PRInt32 inContentOffset,
PRBool inHint,
PRInt32* outFrameContentOffset,
nsIFrame **outChildFrame);
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protected:
virtual PRIntn GetSkipSides() const;
void DrainOverflowFrames(nsPresContext* aPresContext);
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};
nsIFrame*
NS_NewFirstLetterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
return new (aPresShell) nsFirstLetterFrame(aContext);
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}
#ifdef NS_DEBUG
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NS_IMETHODIMP
nsFirstLetterFrame::GetFrameName(nsAString& aResult) const
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{
return MakeFrameName(NS_LITERAL_STRING("Letter"), aResult);
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}
#endif
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nsIAtom*
nsFirstLetterFrame::GetType() const
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{
return nsLayoutAtoms::letterFrame;
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}
PRIntn
nsFirstLetterFrame::GetSkipSides() const
{
return 0;
}
NS_IMETHODIMP
nsFirstLetterFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsRefPtr<nsStyleContext> newSC;
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if (aPrevInFlow) {
// Get proper style context for ourselves. We're creating the frame
// that represents everything *except* the first letter, so just create
// a style context like we would for a text node.
nsStyleContext* parentStyleContext = mStyleContext->GetParent();
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if (parentStyleContext) {
newSC = mStyleContext->GetRuleNode()->GetPresContext()->StyleSet()->
ResolveStyleForNonElement(parentStyleContext);
if (newSC)
SetStyleContextWithoutNotification(newSC);
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}
}
return nsFirstLetterFrameSuper::Init(aContent, aParent, aPrevInFlow);
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}
NS_IMETHODIMP
nsFirstLetterFrame::SetInitialChildList(nsIAtom* aListName,
nsIFrame* aChildList)
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{
mFrames.SetFrames(aChildList);
nsFrameManager *frameManager = GetPresContext()->FrameManager();
for (nsIFrame* frame = aChildList; frame; frame = frame->GetNextSibling()) {
NS_ASSERTION(frame->GetParent() == this, "Unexpected parent");
frameManager->ReParentStyleContext(frame);
}
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return NS_OK;
}
NS_IMETHODIMP
nsFirstLetterFrame::SetSelected(nsPresContext* aPresContext, nsIDOMRange *aRange,PRBool aSelected, nsSpread aSpread)
{
if (aSelected && ParentDisablesSelection())
return NS_OK;
nsIFrame *child = GetFirstChild(nsnull);
while (child)
{
child->SetSelected(aPresContext, aRange, aSelected, aSpread);
// don't worry about result. there are more frames to come
child = child->GetNextSibling();
}
return NS_OK;
}
NS_IMETHODIMP
nsFirstLetterFrame::GetChildFrameContainingOffset(PRInt32 inContentOffset,
PRBool inHint,
PRInt32* outFrameContentOffset,
nsIFrame **outChildFrame)
{
nsIFrame *kid = mFrames.FirstChild();
if (kid)
{
return kid->GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
}
else
return nsFrame::GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
}
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NS_IMETHODIMP
nsFirstLetterFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aReflowStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame", aReflowState.reason);
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aReflowStatus);
nsresult rv = NS_OK;
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// Grab overflow list
DrainOverflowFrames(aPresContext);
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nsIFrame* kid = mFrames.FirstChild();
// Setup reflow state for our child
nsSize availSize(aReflowState.availableWidth, aReflowState.availableHeight);
const nsMargin& bp = aReflowState.mComputedBorderPadding;
nscoord lr = bp.left + bp.right;
nscoord tb = bp.top + bp.bottom;
if (NS_UNCONSTRAINEDSIZE != availSize.width) {
availSize.width -= lr;
}
if (NS_UNCONSTRAINEDSIZE != availSize.height) {
availSize.height -= tb;
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}
// Reflow the child
if (!aReflowState.mLineLayout) {
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// When there is no lineLayout provided, we provide our own. The
// only time that the first-letter-frame is not reflowing in a
// line context is when its floating.
nsHTMLReflowState rs(aPresContext, aReflowState, kid, availSize);
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nsLineLayout ll(aPresContext, nsnull, &aReflowState,
aMetrics.mComputeMEW);
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ll.BeginLineReflow(0, 0, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE,
PR_FALSE, PR_TRUE);
rs.mLineLayout = &ll;
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ll.SetFirstLetterStyleOK(PR_TRUE);
kid->WillReflow(aPresContext);
kid->Reflow(aPresContext, aMetrics, rs, aReflowStatus);
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ll.EndLineReflow();
}
else {
// Pretend we are a span and reflow the child frame
nsLineLayout* ll = aReflowState.mLineLayout;
PRBool pushedFrame;
ll->BeginSpan(this, &aReflowState, bp.left, availSize.width);
ll->ReflowFrame(kid, aReflowStatus, &aMetrics, pushedFrame);
nsSize size;
ll->EndSpan(this, size,
aMetrics.mComputeMEW ? &aMetrics.mMaxElementWidth : nsnull);
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}
// Place and size the child and update the output metrics
kid->SetRect(nsRect(bp.left, bp.top, aMetrics.width, aMetrics.height));
kid->DidReflow(aPresContext, nsnull, NS_FRAME_REFLOW_FINISHED);
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aMetrics.width += lr;
aMetrics.height += tb;
aMetrics.ascent += bp.top;
aMetrics.descent += bp.bottom;
if (aMetrics.mComputeMEW) {
aMetrics.mMaxElementWidth += lr;
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}
// Create a continuation or remove existing continuations based on
// the reflow completion status.
if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
nsIFrame* kidNextInFlow = kid->GetNextInFlow();
if (kidNextInFlow) {
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// Remove all of the childs next-in-flows
NS_STATIC_CAST(nsContainerFrame*, kidNextInFlow->GetParent())
->DeleteNextInFlowChild(aPresContext, kidNextInFlow);
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}
}
else {
// Create a continuation for the child frame if it doesn't already
// have one.
nsIFrame* nextInFlow;
rv = CreateNextInFlow(aPresContext, this, kid, nextInFlow);
if (NS_FAILED(rv)) {
return rv;
}
// And then push it to our overflow list
if (nextInFlow) {
kid->SetNextSibling(nsnull);
SetOverflowFrames(aPresContext, nextInFlow);
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}
else {
nsIFrame* nextSib = kid->GetNextSibling();
if (nextSib) {
kid->SetNextSibling(nsnull);
SetOverflowFrames(aPresContext, nextSib);
}
}
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}
NS_FRAME_SET_TRUNCATION(aReflowStatus, aReflowState, aMetrics);
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return rv;
}
NS_IMETHODIMP
nsFirstLetterFrame::CanContinueTextRun(PRBool& aContinueTextRun) const
{
// We can continue a text run through a first-letter frame.
aContinueTextRun = PR_TRUE;
return NS_OK;
}
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void
nsFirstLetterFrame::DrainOverflowFrames(nsPresContext* aPresContext)
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{
nsIFrame* overflowFrames;
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// Check for an overflow list with our prev-in-flow
nsFirstLetterFrame* prevInFlow = (nsFirstLetterFrame*)GetPrevInFlow();
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if (nsnull != prevInFlow) {
overflowFrames = prevInFlow->GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
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NS_ASSERTION(mFrames.IsEmpty(), "bad overflow list");
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
nsIFrame* f = overflowFrames;
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while (f) {
nsHTMLContainerFrame::ReparentFrameView(aPresContext, f, prevInFlow, this);
f = f->GetNextSibling();
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}
mFrames.InsertFrames(this, nsnull, overflowFrames);
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}
}
// It's also possible that we have an overflow list for ourselves
overflowFrames = GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
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NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
mFrames.AppendFrames(nsnull, overflowFrames);
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}
// Now repair our first frames style context (since we only reflow
// one frame there is no point in doing any other ones until they
// are reflowed)
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nsIFrame* kid = mFrames.FirstChild();
if (kid) {
nsRefPtr<nsStyleContext> sc;
nsIContent* kidContent = kid->GetContent();
if (kidContent) {
NS_ASSERTION(kidContent->IsContentOfType(nsIContent::eTEXT),
"should contain only text nodes");
sc = aPresContext->StyleSet()->ResolveStyleForNonElement(mStyleContext);
if (sc) {
kid->SetStyleContext(sc);
}
}
}
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}