gecko-dev/layout/generic/nsFirstLetterFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Communicator client code.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "nsCOMPtr.h"
#include "nsHTMLContainerFrame.h"
#include "nsIPresContext.h"
#include "nsIStyleContext.h"
#include "nsIReflowCommand.h"
#include "nsIContent.h"
#include "nsLineLayout.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLIIDs.h"
#include "nsLayoutAtoms.h"
#define nsFirstLetterFrameSuper nsHTMLContainerFrame
class nsFirstLetterFrame : public nsFirstLetterFrameSuper {
public:
nsFirstLetterFrame();
NS_IMETHOD Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow);
NS_IMETHOD SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList);
#ifdef NS_DEBUG
NS_IMETHOD GetFrameName(nsString& aResult) const;
#endif
NS_IMETHOD GetFrameType(nsIAtom** aType) const;
NS_IMETHOD Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
NS_IMETHOD CanContinueTextRun(PRBool& aContinueTextRun) const;
NS_IMETHOD SetSelected(nsIPresContext* aPresContext, nsIDOMRange *aRange,PRBool aSelected, nsSpread aSpread);
//override of nsFrame method
NS_IMETHOD GetChildFrameContainingOffset(PRInt32 inContentOffset,
PRBool inHint,
PRInt32* outFrameContentOffset,
nsIFrame **outChildFrame);
protected:
virtual PRIntn GetSkipSides() const;
void DrainOverflowFrames(nsIPresContext* aPresContext);
};
nsresult
NS_NewFirstLetterFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsFirstLetterFrame* it = new (aPresShell) nsFirstLetterFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsFirstLetterFrame::nsFirstLetterFrame()
{
}
#ifdef NS_DEBUG
NS_IMETHODIMP
nsFirstLetterFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("Letter", aResult);
}
#endif
NS_IMETHODIMP
nsFirstLetterFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::letterFrame;
NS_ADDREF(*aType);
return NS_OK;
}
PRIntn
nsFirstLetterFrame::GetSkipSides() const
{
return 0;
}
NS_IMETHODIMP
nsFirstLetterFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv;
nsIStyleContext* newSC = nsnull;
if (aPrevInFlow) {
// Get proper style context for ourselves
nsIStyleContext* parentStyleContext;
parentStyleContext = aContext->GetParent();
if (parentStyleContext) {
nsIAtom* atom = aPrevInFlow
? nsHTMLAtoms::mozLetterFrame
: nsHTMLAtoms::firstLetterPseudo;
rv = aPresContext->ResolvePseudoStyleContextFor(aContent, atom,
parentStyleContext,
PR_FALSE, &newSC);
NS_RELEASE(parentStyleContext);
if (NS_FAILED(rv)) {
return rv;
}
if (nsnull != newSC) {
if (newSC == aContext) {
NS_RELEASE(newSC);
}
else {
aContext = newSC;
}
}
}
}
rv = nsFirstLetterFrameSuper::Init(aPresContext, aContent, aParent,
aContext, aPrevInFlow);
NS_IF_RELEASE(newSC);
return rv;
}
NS_IMETHODIMP
nsFirstLetterFrame::SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
mFrames.SetFrames(aChildList);
if (aChildList) {
aPresContext->ReParentStyleContext(aChildList, mStyleContext);
}
return NS_OK;
}
NS_IMETHODIMP
nsFirstLetterFrame::SetSelected(nsIPresContext* aPresContext, nsIDOMRange *aRange,PRBool aSelected, nsSpread aSpread)
{
if (aSelected && ParentDisablesSelection())
return NS_OK;
nsIFrame *child;
nsresult result = FirstChild(aPresContext, nsnull, &child);
while (NS_SUCCEEDED(result) && child)
{
child->SetSelected(aPresContext,aRange, aSelected,aSpread);//dont worry about result. there are more frames to come
result = child->GetNextSibling(&child);
}
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);
}
NS_IMETHODIMP
nsFirstLetterFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aReflowStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame", aReflowState.reason);
nsresult rv = NS_OK;
// Grab overflow list
DrainOverflowFrames(aPresContext);
nsIFrame* kid = mFrames.FirstChild();
nsIFrame* nextRCFrame = nsnull;
if (aReflowState.reason == eReflowReason_Incremental) {
nsIFrame* target;
aReflowState.reflowCommand->GetTarget(target);
if (this != target) {
aReflowState.reflowCommand->GetNext(nextRCFrame);
}
}
// 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;
}
// Reflow the child
if (!aReflowState.mLineLayout) {
// 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);
nsLineLayout ll(aPresContext, nsnull, &aReflowState,
nsnull != aMetrics.maxElementSize);
ll.BeginLineReflow(0, 0, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE,
PR_FALSE, PR_TRUE);
rs.mLineLayout = ≪
ll.SetFirstLetterStyleOK(PR_TRUE);
kid->WillReflow(aPresContext);
kid->Reflow(aPresContext, aMetrics, rs, aReflowStatus);
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, &nextRCFrame, aReflowStatus, &aMetrics, pushedFrame);
nsSize size;
ll->EndSpan(this, size, aMetrics.maxElementSize);
}
// Place and size the child and update the output metrics
kid->MoveTo(aPresContext, bp.left, bp.top);
kid->SizeTo(aPresContext, aMetrics.width, aMetrics.height);
kid->DidReflow(aPresContext, NS_FRAME_REFLOW_FINISHED);
aMetrics.width += lr;
aMetrics.height += tb;
aMetrics.ascent += bp.top;
aMetrics.descent += bp.bottom;
if (aMetrics.maxElementSize) {
aMetrics.maxElementSize->width += lr;
aMetrics.maxElementSize->height += tb;
}
// Create a continuation or remove existing continuations based on
// the reflow completion status.
if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
nsIFrame* kidNextInFlow;
kid->GetNextInFlow(&kidNextInFlow);
if (nsnull != kidNextInFlow) {
// Remove all of the childs next-in-flows
DeleteChildsNextInFlow(aPresContext, kid);
}
}
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);
}
else {
nsIFrame* nextSib;
kid->GetNextSibling(&nextSib);
if (nextSib) {
kid->SetNextSibling(nsnull);
SetOverflowFrames(aPresContext, nextSib);
}
}
}
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;
}
void
nsFirstLetterFrame::DrainOverflowFrames(nsIPresContext* aPresContext)
{
nsIFrame* overflowFrames;
// Check for an overflow list with our prev-in-flow
nsFirstLetterFrame* prevInFlow = (nsFirstLetterFrame*)mPrevInFlow;
if (nsnull != prevInFlow) {
overflowFrames = prevInFlow->GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
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;
while (f) {
nsHTMLContainerFrame::ReparentFrameView(aPresContext, f, prevInFlow, this);
f->GetNextSibling(&f);
}
mFrames.InsertFrames(this, nsnull, overflowFrames);
}
}
// It's also possible that we have an overflow list for ourselves
overflowFrames = GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
mFrames.AppendFrames(nsnull, overflowFrames);
}
// 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)
nsIFrame* kid = mFrames.FirstChild();
if (kid) {
nsCOMPtr<nsIStyleContext> sc;
nsCOMPtr<nsIContent> kidContent;
kid->GetContent(getter_AddRefs(kidContent));
if (kidContent) {
aPresContext->ResolveStyleContextFor(kidContent, mStyleContext,
PR_FALSE, getter_AddRefs(sc));
if (sc) {
kid->SetStyleContext(aPresContext, sc);
}
}
}
}