gecko/layout/generic/nsFirstLetterFrame.cpp
L. David Baron 33de67ec1b Bug 896138 patch 6: Move restyle management code from nsFrameManager to RestyleManager. r=heycam
This is the second of two big chunks of code moved into the new
RestyleManager class from another sources.

Note that the undisplayed map remains in nsFrameManager, although it
could perhaps have moved.
2013-07-20 12:14:25 -07:00

396 lines
14 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* rendering object for CSS :first-letter pseudo-element */
#include "nsCOMPtr.h"
#include "nsFirstLetterFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsIContent.h"
#include "nsLineLayout.h"
#include "nsGkAtoms.h"
#include "nsAutoPtr.h"
#include "nsStyleSet.h"
#include "nsFrameManager.h"
#include "RestyleManager.h"
#include "nsPlaceholderFrame.h"
#include "nsCSSFrameConstructor.h"
using namespace mozilla;
using namespace mozilla::layout;
nsIFrame*
NS_NewFirstLetterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsFirstLetterFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsFirstLetterFrame)
NS_QUERYFRAME_HEAD(nsFirstLetterFrame)
NS_QUERYFRAME_ENTRY(nsFirstLetterFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
#ifdef DEBUG
NS_IMETHODIMP
nsFirstLetterFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Letter"), aResult);
}
#endif
nsIAtom*
nsFirstLetterFrame::GetType() const
{
return nsGkAtoms::letterFrame;
}
void
nsFirstLetterFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
}
void
nsFirstLetterFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsRefPtr<nsStyleContext> newSC;
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();
if (parentStyleContext) {
newSC = PresContext()->StyleSet()->
ResolveStyleForNonElement(parentStyleContext);
if (newSC)
SetStyleContextWithoutNotification(newSC);
}
}
nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
NS_IMETHODIMP
nsFirstLetterFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
RestyleManager* restyleManager = PresContext()->RestyleManager();
for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
NS_ASSERTION(e.get()->GetParent() == this, "Unexpected parent");
restyleManager->ReparentStyleContext(e.get());
}
mFrames.SetFrames(aChildList);
return NS_OK;
}
NS_IMETHODIMP
nsFirstLetterFrame::GetChildFrameContainingOffset(int32_t inContentOffset,
bool inHint,
int32_t* outFrameContentOffset,
nsIFrame **outChildFrame)
{
nsIFrame *kid = mFrames.FirstChild();
if (kid)
{
return kid->GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
}
else
return nsFrame::GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
}
// Needed for non-floating first-letter frames and for the continuations
// following the first-letter that we also use nsFirstLetterFrame for.
/* virtual */ void
nsFirstLetterFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData)
{
DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH);
}
// Needed for non-floating first-letter frames and for the continuations
// following the first-letter that we also use nsFirstLetterFrame for.
/* virtual */ void
nsFirstLetterFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
nsIFrame::InlinePrefWidthData *aData)
{
DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH);
}
// Needed for floating first-letter frames.
/* virtual */ nscoord
nsFirstLetterFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
{
return nsLayoutUtils::MinWidthFromInline(this, aRenderingContext);
}
// Needed for floating first-letter frames.
/* virtual */ nscoord
nsFirstLetterFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
{
return nsLayoutUtils::PrefWidthFromInline(this, aRenderingContext);
}
/* virtual */ nsSize
nsFirstLetterFrame::ComputeSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
uint32_t aFlags)
{
if (GetPrevInFlow()) {
// We're wrapping the text *after* the first letter, so behave like an
// inline frame.
return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
return nsContainerFrame::ComputeSize(aRenderingContext,
aCBSize, aAvailableWidth, aMargin, aBorder, aPadding, aFlags);
}
NS_IMETHODIMP
nsFirstLetterFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aReflowStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aReflowStatus);
nsresult rv = NS_OK;
// Grab overflow list
DrainOverflowFrames(aPresContext);
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;
NS_ASSERTION(availSize.width != NS_UNCONSTRAINEDSIZE,
"should no longer use unconstrained widths");
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, nullptr, &aReflowState, nullptr);
// For unicode-bidi: plaintext, we need to get the direction of the line
// from the resolved paragraph level of the child, not the block frame,
// because the block frame could be split by hard line breaks into
// multiple paragraphs with different base direction
uint8_t direction;
nsIFrame* containerFrame = ll.LineContainerFrame();
if (containerFrame->StyleTextReset()->mUnicodeBidi &
NS_STYLE_UNICODE_BIDI_PLAINTEXT) {
FramePropertyTable *propTable = aPresContext->PropertyTable();
direction = NS_PTR_TO_INT32(propTable->Get(kid, BaseLevelProperty())) & 1;
} else {
direction = containerFrame->StyleVisibility()->mDirection;
}
ll.BeginLineReflow(bp.left, bp.top, availSize.width, NS_UNCONSTRAINEDSIZE,
false, true, direction);
rs.mLineLayout = &ll;
ll.SetInFirstLetter(true);
ll.SetFirstLetterStyleOK(true);
kid->WillReflow(aPresContext);
kid->Reflow(aPresContext, aMetrics, rs, aReflowStatus);
ll.EndLineReflow();
ll.SetInFirstLetter(false);
// In the floating first-letter case, we need to set this ourselves;
// nsLineLayout::BeginSpan will set it in the other case
mBaseline = aMetrics.ascent;
}
else {
// Pretend we are a span and reflow the child frame
nsLineLayout* ll = aReflowState.mLineLayout;
bool pushedFrame;
ll->SetInFirstLetter(
mStyleContext->GetPseudo() == nsCSSPseudoElements::firstLetter);
ll->BeginSpan(this, &aReflowState, bp.left, availSize.width, &mBaseline);
ll->ReflowFrame(kid, aReflowStatus, &aMetrics, pushedFrame);
ll->EndSpan(this);
ll->SetInFirstLetter(false);
}
// Place and size the child and update the output metrics
kid->SetRect(nsRect(bp.left, bp.top, aMetrics.width, aMetrics.height));
kid->FinishAndStoreOverflow(&aMetrics);
kid->DidReflow(aPresContext, nullptr, nsDidReflowStatus::FINISHED);
aMetrics.width += lr;
aMetrics.height += tb;
aMetrics.ascent += bp.top;
// Ensure that the overflow rect contains the child textframe's overflow rect.
// Note that if this is floating, the overline/underline drawable area is in
// the overflow rect of the child textframe.
aMetrics.UnionOverflowAreasWithDesiredBounds();
ConsiderChildOverflow(aMetrics.mOverflowAreas, kid);
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
// Create a continuation or remove existing continuations based on
// the reflow completion status.
if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
if (aReflowState.mLineLayout) {
aReflowState.mLineLayout->SetFirstLetterStyleOK(false);
}
nsIFrame* kidNextInFlow = kid->GetNextInFlow();
if (kidNextInFlow) {
// Remove all of the childs next-in-flows
static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
->DeleteNextInFlowChild(aPresContext, kidNextInFlow, true);
}
}
else {
// Create a continuation for the child frame if it doesn't already
// have one.
if (!IsFloating()) {
nsIFrame* nextInFlow;
rv = CreateNextInFlow(aPresContext, kid, nextInFlow);
if (NS_FAILED(rv)) {
return rv;
}
// And then push it to our overflow list
const nsFrameList& overflow = mFrames.RemoveFramesAfter(kid);
if (overflow.NotEmpty()) {
SetOverflowFrames(aPresContext, overflow);
}
} else if (!kid->GetNextInFlow()) {
// For floating first letter frames (if a continuation wasn't already
// created for us) we need to put the continuation with the rest of the
// text that the first letter frame was made out of.
nsIFrame* continuation;
rv = CreateContinuationForFloatingParent(aPresContext, kid,
&continuation, true);
}
}
}
FinishAndStoreOverflow(&aMetrics);
NS_FRAME_SET_TRUNCATION(aReflowStatus, aReflowState, aMetrics);
return rv;
}
/* virtual */ bool
nsFirstLetterFrame::CanContinueTextRun() const
{
// We can continue a text run through a first-letter frame.
return true;
}
nsresult
nsFirstLetterFrame::CreateContinuationForFloatingParent(nsPresContext* aPresContext,
nsIFrame* aChild,
nsIFrame** aContinuation,
bool aIsFluid)
{
NS_ASSERTION(IsFloating(),
"can only call this on floating first letter frames");
NS_PRECONDITION(aContinuation, "bad args");
*aContinuation = nullptr;
nsresult rv = NS_OK;
nsIPresShell* presShell = aPresContext->PresShell();
nsPlaceholderFrame* placeholderFrame =
presShell->FrameManager()->GetPlaceholderFrameFor(this);
nsIFrame* parent = placeholderFrame->GetParent();
nsIFrame* continuation = presShell->FrameConstructor()->
CreateContinuingFrame(aPresContext, aChild, parent, aIsFluid);
// The continuation will have gotten the first letter style from it's
// prev continuation, so we need to repair the style context so it
// doesn't have the first letter styling.
nsStyleContext* parentSC = this->StyleContext()->GetParent();
if (parentSC) {
nsRefPtr<nsStyleContext> newSC;
newSC = presShell->StyleSet()->ResolveStyleForNonElement(parentSC);
if (newSC) {
continuation->SetStyleContext(newSC);
}
}
//XXX Bidi may not be involved but we have to use the list name
// kNoReflowPrincipalList because this is just like creating a continuation
// except we have to insert it in a different place and we don't want a
// reflow command to try to be issued.
nsFrameList temp(continuation, continuation);
rv = parent->InsertFrames(kNoReflowPrincipalList, placeholderFrame, temp);
*aContinuation = continuation;
return rv;
}
void
nsFirstLetterFrame::DrainOverflowFrames(nsPresContext* aPresContext)
{
// Check for an overflow list with our prev-in-flow
nsFirstLetterFrame* prevInFlow = (nsFirstLetterFrame*)GetPrevInFlow();
if (prevInFlow) {
AutoFrameListPtr overflowFrames(aPresContext,
prevInFlow->StealOverflowFrames());
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.
nsContainerFrame::ReparentFrameViewList(aPresContext, *overflowFrames,
prevInFlow, this);
mFrames.InsertFrames(this, nullptr, *overflowFrames);
}
}
// It's also possible that we have an overflow list for ourselves
AutoFrameListPtr overflowFrames(aPresContext, StealOverflowFrames());
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
mFrames.AppendFrames(nullptr, *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) {
nsRefPtr<nsStyleContext> sc;
nsIContent* kidContent = kid->GetContent();
if (kidContent) {
NS_ASSERTION(kidContent->IsNodeOfType(nsINode::eTEXT),
"should contain only text nodes");
sc = aPresContext->StyleSet()->ResolveStyleForNonElement(mStyleContext);
if (sc) {
kid->SetStyleContext(sc);
}
}
}
}
nscoord
nsFirstLetterFrame::GetBaseline() const
{
return mBaseline;
}