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gecko-dev/layout/generic/nsInlineFrame.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 "nsInlineFrame.h"
#include "nsHTMLIIDs.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLParts.h"
#include "nsIStyleContext.h"
#include "nsIPresShell.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsLayoutAtoms.h"
#ifdef DEBUG
#undef NOISY_PUSHING
#endif
nsIID nsInlineFrame::kInlineFrameCID = NS_INLINE_FRAME_CID;
//////////////////////////////////////////////////////////////////////
// Basic nsInlineFrame methods
nsresult
NS_NewInlineFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsInlineFrame* it = new (aPresShell) nsInlineFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsInlineFrame::nsInlineFrame()
{
}
NS_IMETHODIMP
nsInlineFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (nsnull == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kInlineFrameCID)) {
nsInlineFrame* tmp = this;
*aInstancePtr = (void*) tmp;
return NS_OK;
}
return nsInlineFrameSuper::QueryInterface(aIID, aInstancePtr);
}
#ifdef DEBUG
NS_IMETHODIMP
nsInlineFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("Inline", aResult);
}
#endif
NS_IMETHODIMP
nsInlineFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::inlineFrame;
NS_ADDREF(*aType);
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
if (nsnull != aListName) {
return NS_ERROR_INVALID_ARG;
}
if (aFrameList) {
mFrames.AppendFrames(this, aFrameList);
// Ask the parent frame to reflow me.
ReflowDirtyChild(&aPresShell, nsnull);
}
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
if (nsnull != aListName) {
return NS_ERROR_INVALID_ARG;
}
if (aFrameList) {
// Insert frames after aPrevFrame
mFrames.InsertFrames(this, aPrevFrame, aFrameList);
// Ask the parent frame to reflow me.
ReflowDirtyChild(&aPresShell, nsnull);
}
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
if (nsnull != aListName) {
return NS_ERROR_INVALID_ARG;
}
if (aOldFrame) {
// Loop and destroy the frame and all of its continuations.
PRBool generateReflowCommand = PR_FALSE;
nsIFrame* oldFrameParent;
aOldFrame->GetParent(&oldFrameParent);
nsInlineFrame* parent = (nsInlineFrame*) oldFrameParent;
while (nsnull != aOldFrame) {
// If the frame being removed has zero size then don't bother
// generating a reflow command, otherwise make sure we do.
nsRect bbox;
aOldFrame->GetRect(bbox);
if (bbox.width || bbox.height) {
generateReflowCommand = PR_TRUE;
}
// When the parent is an inline frame we have a simple task - just
// remove the frame from its parents list and generate a reflow
// command.
nsIFrame* oldFrameNextInFlow;
aOldFrame->GetNextInFlow(&oldFrameNextInFlow);
nsSplittableType st;
aOldFrame->IsSplittable(st);
if (NS_FRAME_NOT_SPLITTABLE != st) {
nsSplittableFrame::RemoveFromFlow(aOldFrame);
}
parent->mFrames.DestroyFrame(aPresContext, aOldFrame);
aOldFrame = oldFrameNextInFlow;
if (nsnull != aOldFrame) {
aOldFrame->GetParent((nsIFrame**) &parent);
}
}
if (generateReflowCommand) {
// Ask the parent frame to reflow me.
ReflowDirtyChild(&aPresShell, nsnull);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::ReplaceFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
if (nsnull != aListName) {
return NS_ERROR_INVALID_ARG;
}
if (!aOldFrame || !aNewFrame) {
return NS_ERROR_INVALID_ARG;
}
// Replace the old frame with the new frame in the list, then remove the old frame
mFrames.ReplaceFrame(this, aOldFrame, aNewFrame);
aOldFrame->Destroy(aPresContext);
// Ask the parent frame to reflow me.
ReflowDirtyChild(&aPresShell, nsnull);
return NS_OK;
}
//////////////////////////////////////////////////////////////////////
// Reflow methods
NS_IMETHODIMP
nsInlineFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsInlineFrame", aReflowState.reason);
if (nsnull == aReflowState.mLineLayout) {
return NS_ERROR_INVALID_ARG;
}
PRBool lazilySetParentPointer = PR_FALSE;
// Check for an overflow list with our prev-in-flow
nsInlineFrame* prevInFlow = (nsInlineFrame*)mPrevInFlow;
if (nsnull != prevInFlow) {
nsIFrame* prevOverflowFrames = prevInFlow->GetOverflowFrames(aPresContext, PR_TRUE);
if (prevOverflowFrames) {
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
nsHTMLContainerFrame::ReparentFrameViewList(aPresContext, prevOverflowFrames,
prevInFlow, this);
if (aReflowState.reason == eReflowReason_Initial) {
// If it's the initial reflow, then our child list must be empty, so
// just set the child list rather than calling InsertFrame(). This avoids
// having to get the last child frame in the list.
// Note that we don't set the parent pointer for the new frames. Instead wait
// to do this until we actually reflow the frame. If the overflow list contains
// thousands of frames this is a big performance issue (see bug #5588)
NS_ASSERTION(mFrames.IsEmpty(), "child list is not empty for initial reflow");
mFrames.SetFrames(prevOverflowFrames);
lazilySetParentPointer = PR_TRUE;
} else {
// Insert the new frames at the beginning of the child list
// and set their parent pointer
mFrames.InsertFrames(this, nsnull, prevOverflowFrames);
}
}
}
// It's also possible that we have an overflow list for ourselves
#ifdef DEBUG
if (aReflowState.reason == eReflowReason_Initial) {
// If it's our initial reflow, then we should not have an overflow list.
// However, add an assertion in case we get reflowed more than once with
// the initial reflow reason
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_FALSE);
NS_ASSERTION(!overflowFrames, "overflow list is not empty for initial reflow");
}
#endif
if (aReflowState.reason != eReflowReason_Initial) {
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
// Because we lazily set the parent pointer of child frames we get from
// our prev-in-flow's overflow list, it's possible that we have not set
// the parent pointer for these frames. Check the first frame to see, and
// if we haven't set the parent pointer then set it now
nsIFrame* parent;
overflowFrames->GetParent(&parent);
mFrames.AppendFrames(parent == this ? nsnull : this, overflowFrames);
}
}
if (IsFrameTreeTooDeep(aReflowState, aMetrics)) {
#ifdef DEBUG_kipp
{
extern char* nsPresShell_ReflowStackPointerTop;
char marker;
char* newsp = (char*) ▮
printf("XXX: frame tree is too deep; approx stack size = %d\n",
nsPresShell_ReflowStackPointerTop - newsp);
}
#endif
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nsnull;
irs.mNextInFlow = (nsInlineFrame*) mNextInFlow;
irs.mNextRCFrame = nsnull;
irs.mSetParentPointer = lazilySetParentPointer;
if (eReflowReason_Incremental == aReflowState.reason) {
// Peel off the next frame in the path if this is an incremental
// reflow aimed at one of the children.
nsIFrame* target;
aReflowState.reflowCommand->GetTarget(target);
if (this != target) {
aReflowState.reflowCommand->GetNext(irs.mNextRCFrame);
}
}
nsresult rv;
if (mFrames.IsEmpty()) {
// Try to pull over one frame before starting so that we know
// whether we have an anonymous block or not.
PRBool complete;
(void) PullOneFrame(aPresContext, irs, &complete);
}
rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
// Note: the line layout code will properly compute our
// NS_FRAME_OUTSIDE_CHILDREN state for us.
return rv;
}
NS_IMETHODIMP
nsInlineFrame::CanContinueTextRun(PRBool& aContinueTextRun) const
{
// We can continue a text run through an inline frame
aContinueTextRun = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP
nsInlineFrame::ReflowDirtyChild(nsIPresShell* aPresShell, nsIFrame* aChild)
{
// The inline container frame does not handle the reflow
// request. It passes it up to its parent container.
// If you don't already have dirty children,
if (!(mState & NS_FRAME_HAS_DIRTY_CHILDREN)) {
if (mParent) {
// Record that you are dirty and have dirty children
mState |= NS_FRAME_IS_DIRTY;
mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
// Pass the reflow request up to the parent
mParent->ReflowDirtyChild(aPresShell, (nsIFrame*) this);
}
else {
NS_ASSERTION(0, "No parent to pass the reflow request up to.");
}
}
return NS_OK;
}
nsresult
nsInlineFrame::ReflowFrames(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
InlineReflowState& irs,
nsHTMLReflowMetrics& aMetrics,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
aStatus = NS_FRAME_COMPLETE;
nsLineLayout* lineLayout = aReflowState.mLineLayout;
nscoord leftEdge = 0;
if (nsnull == mPrevInFlow) {
leftEdge = aReflowState.mComputedBorderPadding.left;
}
nscoord availableWidth = aReflowState.availableWidth;
if (NS_UNCONSTRAINEDSIZE != availableWidth) {
// Subtract off left and right border+padding from availableWidth
availableWidth -= leftEdge;
availableWidth -= aReflowState.mComputedBorderPadding.right;
}
lineLayout->BeginSpan(this, &aReflowState, leftEdge, leftEdge + availableWidth);
// First reflow our current children
nsIFrame* frame = mFrames.FirstChild();
PRBool done = PR_FALSE;
while (nsnull != frame) {
PRBool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
// Check if we should lazily set the child frame's parent pointer
if (irs.mSetParentPointer) {
frame->SetParent(this);
// We also need to check if frame has a next-in-flow. It it does, then set
// its parent frame pointer, too. Otherwise, if we reflow frame and it's
// complete we'll fail when deleting its next-in-flow which is no longer
// needed. This scenario doesn't happen often, but it can happen
nsIFrame* nextInFlow;
frame->GetNextInFlow(&nextInFlow);
while (nextInFlow) {
// Since we only do lazy setting of parent pointers for the frame's
// initial reflow, this frame can't have a next-in-flow. That means
// the continuing child frame must be in our child list as well. If
// not, then something is wrong
NS_ASSERTION(mFrames.ContainsFrame(nextInFlow), "unexpected flow");
nextInFlow->SetParent(this);
nextInFlow->GetNextInFlow(&nextInFlow);
}
}
rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
if (NS_FAILED(rv)) {
done = PR_TRUE;
break;
}
if (NS_FRAME_COMPLETE != aStatus) {
if (!reflowingFirstLetter || NS_INLINE_IS_BREAK(aStatus)) {
done = PR_TRUE;
break;
}
}
irs.mPrevFrame = frame;
frame->GetNextSibling(&frame);
}
// Attempt to pull frames from our next-in-flow until we can't
if (!done && (nsnull != mNextInFlow)) {
while (!done) {
PRBool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
PRBool isComplete;
frame = PullOneFrame(aPresContext, irs, &isComplete);
#ifdef NOISY_PUSHING
printf("%p pulled up %p\n", this, frame);
#endif
if (nsnull == frame) {
if (!isComplete) {
aStatus = NS_FRAME_NOT_COMPLETE;
}
break;
}
rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
if (NS_FAILED(rv)) {
done = PR_TRUE;
break;
}
if (NS_FRAME_COMPLETE != aStatus) {
if (!reflowingFirstLetter || NS_INLINE_IS_BREAK(aStatus)) {
done = PR_TRUE;
break;
}
}
irs.mPrevFrame = frame;
}
}
#ifdef DEBUG
if (NS_FRAME_COMPLETE == aStatus) {
// We can't be complete AND have overflow frames!
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_FALSE);
NS_ASSERTION(!overflowFrames, "whoops");
}
#endif
// If after reflowing our children they take up no area then make
// sure that we don't either.
//
// Note: CSS demands that empty inline elements still affect the
// line-height calculations. However, continuations of an inline
// that are empty we force to empty so that things like collapsed
// whitespace in an inline element don't affect the line-height.
nsSize size;
lineLayout->EndSpan(this, size, aMetrics.maxElementSize);
if ((0 == size.height) && (0 == size.width) &&
((nsnull != mPrevInFlow) || (nsnull != mNextInFlow))) {
// This is a continuation of a previous inline. Therefore make
// sure we don't affect the line-height.
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
aMetrics.descent = 0;
if (nsnull != aMetrics.maxElementSize) {
aMetrics.maxElementSize->width = 0;
aMetrics.maxElementSize->height = 0;
}
}
else {
// Compute final width
aMetrics.width = size.width;
if (nsnull == mPrevInFlow) {
aMetrics.width += aReflowState.mComputedBorderPadding.left;
}
if (NS_FRAME_IS_COMPLETE(aStatus)) {
aMetrics.width += aReflowState.mComputedBorderPadding.right;
}
const nsStyleFont* font;
GetStyleData(eStyleStruct_Font, (const nsStyleStruct*&)font);
aReflowState.rendContext->SetFont(font->mFont);
nsCOMPtr<nsIFontMetrics> fm;
aReflowState.rendContext->GetFontMetrics(*getter_AddRefs(fm));
// Compute final height of the frame.
//
// Do things the standard css2 way -- though it's hard to find it
// in the css2 spec! It's actually found in the css1 spec section
// 4.4 (you will have to read between the lines to really see
// it).
//
// The height of our box is the sum of our font size plus the top
// and bottom border and padding. The height of children do not
// affect our height.
fm->GetMaxAscent(aMetrics.ascent);
fm->GetMaxDescent(aMetrics.descent);
fm->GetHeight(aMetrics.height);
aMetrics.ascent += aReflowState.mComputedBorderPadding.top;
aMetrics.descent += aReflowState.mComputedBorderPadding.bottom;
aMetrics.height += aReflowState.mComputedBorderPadding.top +
aReflowState.mComputedBorderPadding.bottom;
// Note: we normally use the actual font height for computing the
// line-height raw value from the style context. On systems where
// they disagree the actual font height is more appropriate. This
// little hack lets us override that behavior to allow for more
// precise layout in the face of imprecise fonts.
if (nsHTMLReflowState::UseComputedHeight()) {
aMetrics.height = font->mFont.size +
aReflowState.mComputedBorderPadding.top +
aReflowState.mComputedBorderPadding.bottom;
}
}
// For now our overflow area is zero. The real value will be
// computed during vertical alignment of the line we are on.
aMetrics.mOverflowArea.x = 0;
aMetrics.mOverflowArea.y = 0;
aMetrics.mOverflowArea.width = aMetrics.width;
aMetrics.mOverflowArea.height = aMetrics.height;
#ifdef NOISY_FINAL_SIZE
ListTag(stdout);
printf(": metrics=%d,%d ascent=%d descent=%d\n",
aMetrics.width, aMetrics.height, aMetrics.ascent, aMetrics.descent);
if (nsnull != aMetrics.maxElementSize) {
printf(" maxElementSize %d,%d\n",
aMetrics.maxElementSize->width, aMetrics.maxElementSize->height);
}
#endif
return rv;
}
nsresult
nsInlineFrame::ReflowInlineFrame(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
InlineReflowState& irs,
nsIFrame* aFrame,
nsReflowStatus& aStatus)
{
nsLineLayout* lineLayout = aReflowState.mLineLayout;
PRBool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
PRBool pushedFrame;
nsresult rv = lineLayout->ReflowFrame(aFrame, &irs.mNextRCFrame, aStatus,
nsnull, pushedFrame);
if (NS_FAILED(rv)) {
return rv;
}
if (NS_INLINE_IS_BREAK(aStatus)) {
if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) {
if (aFrame != mFrames.FirstChild()) {
// Change break-before status into break-after since we have
// already placed at least one child frame. This preserves the
// break-type so that it can be propogated upward.
aStatus = NS_FRAME_NOT_COMPLETE |
NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
(aStatus & NS_INLINE_BREAK_TYPE_MASK);
PushFrames(aPresContext, aFrame, irs.mPrevFrame);
}
else {
// Preserve reflow status when breaking-before our first child
// and propogate it upward without modification.
// Note: if we're lazily setting the frame pointer for our child
// frames, then we need to set it now. Don't return and leave the
// remaining child frames in our child list with the wrong parent
// frame pointer...
if (irs.mSetParentPointer) {
nsIFrame* f;
aFrame->GetNextSibling(&f);
while (f) {
f->SetParent(this);
f->GetNextSibling(&f);
}
}
}
}
else {
// Break-after
if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
nsIFrame* newFrame;
rv = CreateNextInFlow(aPresContext, this, aFrame, newFrame);
if (NS_FAILED(rv)) {
return rv;
}
}
nsIFrame* nextFrame;
aFrame->GetNextSibling(&nextFrame);
if (nsnull != nextFrame) {
aStatus |= NS_FRAME_NOT_COMPLETE;
PushFrames(aPresContext, nextFrame, aFrame);
}
else if (nsnull != mNextInFlow) {
// We must return an incomplete status if there are more child
// frames remaining in a next-in-flow that follows this frame.
nsInlineFrame* nextInFlow = (nsInlineFrame*) mNextInFlow;
while (nsnull != nextInFlow) {
if (nextInFlow->mFrames.NotEmpty()) {
aStatus |= NS_FRAME_NOT_COMPLETE;
break;
}
nextInFlow = (nsInlineFrame*) nextInFlow->mNextInFlow;
}
}
}
}
else if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
nsIFrame* newFrame;
rv = CreateNextInFlow(aPresContext, this, aFrame, newFrame);
if (NS_FAILED(rv)) {
return rv;
}
if (!reflowingFirstLetter) {
nsIFrame* nextFrame;
aFrame->GetNextSibling(&nextFrame);
if (nsnull != nextFrame) {
PushFrames(aPresContext, nextFrame, aFrame);
}
}
}
return rv;
}
nsIFrame*
nsInlineFrame::PullOneFrame(nsIPresContext* aPresContext,
InlineReflowState& irs,
PRBool* aIsComplete)
{
PRBool isComplete = PR_TRUE;
nsIFrame* frame = nsnull;
nsInlineFrame* nextInFlow = irs.mNextInFlow;
while (nsnull != nextInFlow) {
frame = mFrames.PullFrame(this, irs.mPrevFrame, nextInFlow->mFrames);
if (nsnull != frame) {
isComplete = PR_FALSE;
nsHTMLContainerFrame::ReparentFrameView(aPresContext, frame, nextInFlow, this);
break;
}
nextInFlow = (nsInlineFrame*) nextInFlow->mNextInFlow;
irs.mNextInFlow = nextInFlow;
}
*aIsComplete = isComplete;
return frame;
}
void
nsInlineFrame::PushFrames(nsIPresContext* aPresContext,
nsIFrame* aFromChild,
nsIFrame* aPrevSibling)
{
NS_PRECONDITION(nsnull != aFromChild, "null pointer");
NS_PRECONDITION(nsnull != aPrevSibling, "pushing first child");
#ifdef DEBUG
nsIFrame* prevNextSibling;
aPrevSibling->GetNextSibling(&prevNextSibling);
NS_PRECONDITION(prevNextSibling == aFromChild, "bad prev sibling");
#endif
#ifdef NOISY_PUSHING
printf("%p pushing aFromChild %p, disconnecting from prev sib %p\n",
this, aFromChild, aPrevSibling);
#endif
// Disconnect aFromChild from its previous sibling
aPrevSibling->SetNextSibling(nsnull);
// Add the frames to our overflow list (let our next in flow drain
// our overflow list when it is ready)
SetOverflowFrames(aPresContext, aFromChild);
}
//////////////////////////////////////////////////////////////////////
PRIntn
nsInlineFrame::GetSkipSides() const
{
PRIntn skip = 0;
if (nsnull != mPrevInFlow) {
nsInlineFrame* prev = (nsInlineFrame*) mPrevInFlow;
if (prev->mRect.height || prev->mRect.width) {
// Prev-in-flow is not empty therefore we don't render our left
// border edge.
skip |= 1 << NS_SIDE_LEFT;
}
else {
// If the prev-in-flow is empty, then go ahead and let our right
// edge border render.
}
}
if (nsnull != mNextInFlow) {
nsInlineFrame* next = (nsInlineFrame*) mNextInFlow;
if (next->mRect.height || next->mRect.width) {
// Next-in-flow is not empty therefore we don't render our right
// border edge.
skip |= 1 << NS_SIDE_RIGHT;
}
else {
// If the next-in-flow is empty, then go ahead and let our right
// edge border render.
}
}
return skip;
}
//////////////////////////////////////////////////////////////////////
// nsLineFrame implementation
static void
ReParentChildListStyle(nsIPresContext* aPresContext,
nsIStyleContext* aParentStyleContext,
nsFrameList& aFrameList)
{
nsIFrame* kid = aFrameList.FirstChild();
while (nsnull != kid) {
aPresContext->ReParentStyleContext(kid, aParentStyleContext);
kid->GetNextSibling(&kid);
}
}
nsresult
NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(nsnull != aNewFrame, "null ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsInlineFrame* it = new (aPresShell) nsFirstLineFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsFirstLineFrame::nsFirstLineFrame()
{
}
#ifdef DEBUG
NS_IMETHODIMP
nsFirstLineFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("Line", aResult);
}
#endif
NS_IMETHODIMP
nsFirstLineFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::lineFrame;
NS_ADDREF(*aType);
return NS_OK;
}
void
nsFirstLineFrame::StealFramesFrom(nsIFrame* aFrame)
{
nsIFrame* prevFrame = mFrames.GetPrevSiblingFor(aFrame);
if (prevFrame) {
prevFrame->SetNextSibling(nsnull);
}
else {
mFrames.SetFrames(nsnull);
}
}
nsIFrame*
nsFirstLineFrame::PullOneFrame(nsIPresContext* aPresContext, InlineReflowState& irs, PRBool* aIsComplete)
{
nsIFrame* frame = nsInlineFrame::PullOneFrame(aPresContext, irs, aIsComplete);
if (frame && !mPrevInFlow) {
// We are a first-line frame. Fixup the child frames
// style-context that we just pulled.
aPresContext->ReParentStyleContext(frame, mStyleContext);
}
return frame;
}
NS_IMETHODIMP
nsFirstLineFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
if (nsnull == aReflowState.mLineLayout) {
return NS_ERROR_INVALID_ARG;
}
// Check for an overflow list with our prev-in-flow
nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)mPrevInFlow;
if (nsnull != prevInFlow) {
nsIFrame* prevOverflowFrames = prevInFlow->GetOverflowFrames(aPresContext, PR_TRUE);
if (prevOverflowFrames) {
nsFrameList frames(prevOverflowFrames);
ReParentChildListStyle(aPresContext, mStyleContext, frames);
mFrames.InsertFrames(this, nsnull, prevOverflowFrames);
}
}
// It's also possible that we have an overflow list for ourselves
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
nsFrameList frames(overflowFrames);
ReParentChildListStyle(aPresContext, mStyleContext, frames);
mFrames.AppendFrames(nsnull, overflowFrames);
}
// Set our own reflow state (additional state above and beyond
// aReflowState)
InlineReflowState irs;
irs.mPrevFrame = nsnull;
irs.mNextInFlow = (nsInlineFrame*) mNextInFlow;
irs.mNextRCFrame = nsnull;
if (eReflowReason_Incremental == aReflowState.reason) {
// Peel off the next frame in the path if this is an incremental
// reflow aimed at one of the children.
nsIFrame* target;
aReflowState.reflowCommand->GetTarget(target);
if (this != target) {
aReflowState.reflowCommand->GetNext(irs.mNextRCFrame);
}
}
nsresult rv;
PRBool wasEmpty = mFrames.IsEmpty();
if (wasEmpty) {
// Try to pull over one frame before starting so that we know
// whether we have an anonymous block or not.
PRBool complete;
PullOneFrame(aPresContext, irs, &complete);
}
if (nsnull == mPrevInFlow) {
// XXX This is pretty sick, but what we do here is to pull-up, in
// advance, all of the next-in-flows children. We re-resolve their
// style while we are at at it so that when we reflow they have
// the right style.
//
// All of this is so that text-runs reflow properly.
irs.mPrevFrame = mFrames.LastChild();
for (;;) {
PRBool complete;
nsIFrame* frame = PullOneFrame(aPresContext, irs, &complete);
if (!frame) {
break;
}
irs.mPrevFrame = frame;
}
irs.mPrevFrame = nsnull;
}
else {
// XXX do this in the Init method instead
// For continuations, we need to check and see if our style
// context is right. If its the same as the first-in-flow, then
// we need to fix it up (that way :first-line style doesn't leak
// into this continuation since we aren't the first line).
nsFirstLineFrame* first = (nsFirstLineFrame*) GetFirstInFlow();
if (mStyleContext == first->mStyleContext) {
// Fixup our style context and our children. First get the
// proper parent context.
nsIFrame* parentFrame;
first->GetParent(&parentFrame);
nsIStyleContext* parentContext;
parentFrame->GetStyleContext(&parentContext);
if (parentContext) {
// Create a new style context that is a child of the parent
// style context thus removing the :first-line style. This way
// we behave as if an anonymous (unstyled) span was the child
// of the parent frame.
nsIStyleContext* newSC;
aPresContext->ResolvePseudoStyleContextFor(mContent,
nsHTMLAtoms::mozLineFrame,
parentContext,
PR_FALSE, &newSC);
if (newSC) {
// Switch to the new style context.
SetStyleContext(aPresContext, newSC);
// Re-resolve all children
ReParentChildListStyle(aPresContext, mStyleContext, mFrames);
NS_RELEASE(newSC);
}
NS_RELEASE(parentContext);
}
}
}
rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
// Note: the line layout code will properly compute our
// NS_FRAME_OUTSIDE_CHILDREN state for us.
return rv;
}
//////////////////////////////////////////////////////////////////////
nsresult
NS_NewPositionedInlineFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsPositionedInlineFrame* it = new (aPresShell) nsPositionedInlineFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
NS_IMETHODIMP
nsPositionedInlineFrame::Destroy(nsIPresContext* aPresContext)
{
mAbsoluteContainer.DestroyFrames(this, aPresContext);
return nsInlineFrame::Destroy(aPresContext);
}
NS_IMETHODIMP
nsPositionedInlineFrame::SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult rv;
if (nsLayoutAtoms::absoluteList == aListName) {
rv = mAbsoluteContainer.SetInitialChildList(this, aPresContext, aListName, aChildList);
} else {
rv = nsInlineFrame::SetInitialChildList(aPresContext, aListName, aChildList);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
nsresult rv;
if (nsLayoutAtoms::absoluteList == aListName) {
rv = mAbsoluteContainer.AppendFrames(this, aPresContext, aPresShell, aListName,
aFrameList);
} else {
rv = nsInlineFrame::AppendFrames(aPresContext, aPresShell, aListName,
aFrameList);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
nsresult rv;
if (nsLayoutAtoms::absoluteList == aListName) {
rv = mAbsoluteContainer.InsertFrames(this, aPresContext, aPresShell, aListName,
aPrevFrame, aFrameList);
} else {
rv = nsInlineFrame::InsertFrames(aPresContext, aPresShell, aListName, aPrevFrame,
aFrameList);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsresult rv;
if (nsLayoutAtoms::absoluteList == aListName) {
rv = mAbsoluteContainer.RemoveFrame(this, aPresContext, aPresShell, aListName, aOldFrame);
} else {
rv = nsInlineFrame::RemoveFrame(aPresContext, aPresShell, aListName, aOldFrame);
}
return rv;
}
NS_IMETHODIMP
nsPositionedInlineFrame::GetAdditionalChildListName(PRInt32 aIndex,
nsIAtom** aListName) const
{
NS_PRECONDITION(nsnull != aListName, "null OUT parameter pointer");
*aListName = nsnull;
if (0 == aIndex) {
*aListName = nsLayoutAtoms::absoluteList;
NS_ADDREF(*aListName);
}
return NS_OK;
}
NS_IMETHODIMP
nsPositionedInlineFrame::FirstChild(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame** aFirstChild) const
{
NS_PRECONDITION(nsnull != aFirstChild, "null OUT parameter pointer");
if (aListName == nsLayoutAtoms::absoluteList) {
return mAbsoluteContainer.FirstChild(this, aListName, aFirstChild);
}
return nsInlineFrame::FirstChild(aPresContext, aListName, aFirstChild);
}
NS_IMETHODIMP
nsPositionedInlineFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::positionedInlineFrame;
NS_ADDREF(*aType);
return NS_OK;
}
NS_IMETHODIMP
nsPositionedInlineFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
// See if it's an incremental reflow command
if (eReflowReason_Incremental == aReflowState.reason) {
// Give the absolute positioning code a chance to handle it
PRBool handled;
nsRect childBounds;
nscoord containingBlockWidth = -1;
nscoord containingBlockHeight = -1;
mAbsoluteContainer.IncrementalReflow(this, aPresContext, aReflowState,
containingBlockWidth, containingBlockHeight,
handled, childBounds);
// If the incremental reflow command was handled by the absolute positioning
// code, then we're all done
if (handled) {
// Just return our current size as our desired size
// XXX I don't know how to compute that without a reflow, so for the
// time being pretend a resize reflow occured
nsHTMLReflowState reflowState(aReflowState);
reflowState.reason = eReflowReason_Resize;
reflowState.reflowCommand = nsnull;
rv = nsInlineFrame::Reflow(aPresContext, aDesiredSize, reflowState, aStatus);
// XXX Although this seems like the correct thing to do the line layout
// code seems to reset the NS_FRAME_OUTSIDE_CHILDREN and so it is ignored
#if 0
// Factor the absolutely positioned child bounds into the overflow area
aDesiredSize.mOverflowArea.UnionRect(aDesiredSize.mOverflowArea, childBounds);
// Make sure the NS_FRAME_OUTSIDE_CHILDREN flag is set correctly
if ((aDesiredSize.mOverflowArea.x < 0) ||
(aDesiredSize.mOverflowArea.y < 0) ||
(aDesiredSize.mOverflowArea.XMost() > aDesiredSize.width) ||
(aDesiredSize.mOverflowArea.YMost() > aDesiredSize.height)) {
mState |= NS_FRAME_OUTSIDE_CHILDREN;
} else {
mState &= ~NS_FRAME_OUTSIDE_CHILDREN;
}
#endif
return rv;
}
}
// Let the inline frame do its reflow first
rv = nsInlineFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
// Let the absolutely positioned container reflow any absolutely positioned
// child frames that need to be reflowed
if (NS_SUCCEEDED(rv)) {
nscoord containingBlockWidth = -1;
nscoord containingBlockHeight = -1;
nsRect childBounds;
rv = mAbsoluteContainer.Reflow(this, aPresContext, aReflowState,
containingBlockWidth, containingBlockHeight,
childBounds);
// XXX Although this seems like the correct thing to do the line layout
// code seems to reset the NS_FRAME_OUTSIDE_CHILDREN and so it is ignored
#if 0
// Factor the absolutely positioned child bounds into the overflow area
aDesiredSize.mOverflowArea.UnionRect(aDesiredSize.mOverflowArea, childBounds);
// Make sure the NS_FRAME_OUTSIDE_CHILDREN flag is set correctly
if ((aDesiredSize.mOverflowArea.x < 0) ||
(aDesiredSize.mOverflowArea.y < 0) ||
(aDesiredSize.mOverflowArea.XMost() > aDesiredSize.width) ||
(aDesiredSize.mOverflowArea.YMost() > aDesiredSize.height)) {
mState |= NS_FRAME_OUTSIDE_CHILDREN;
} else {
mState &= ~NS_FRAME_OUTSIDE_CHILDREN;
}
#endif
}
return rv;
}
#ifdef DEBUG
NS_IMETHODIMP
nsPositionedInlineFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
{
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = sizeof(*this);
return NS_OK;
}
#endif
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