403 lines
15 KiB
C++
403 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code is subject to the terms of the Mozilla Public License
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* version 2.0 (the "License"). You can obtain a copy of the License at
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* http://mozilla.org/MPL/2.0/. */
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/* rendering object for CSS "display: ruby" */
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#include "nsRubyFrame.h"
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#include "RubyUtils.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/WritingModes.h"
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#include "nsLineLayout.h"
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#include "nsPresContext.h"
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#include "nsRubyBaseContainerFrame.h"
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#include "nsRubyTextContainerFrame.h"
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#include "nsStyleContext.h"
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using namespace mozilla;
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//----------------------------------------------------------------------
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// Frame class boilerplate
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// =======================
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NS_QUERYFRAME_HEAD(nsRubyFrame)
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NS_QUERYFRAME_ENTRY(nsRubyFrame)
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NS_QUERYFRAME_TAIL_INHERITING(nsInlineFrame)
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NS_IMPL_FRAMEARENA_HELPERS(nsRubyFrame)
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nsContainerFrame*
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NS_NewRubyFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext)
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{
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return new (aPresShell) nsRubyFrame(aContext);
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}
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//----------------------------------------------------------------------
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// nsRubyFrame Method Implementations
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// ==================================
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nsIAtom*
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nsRubyFrame::GetType() const
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{
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return nsGkAtoms::rubyFrame;
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}
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/* virtual */ bool
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nsRubyFrame::IsFrameOfType(uint32_t aFlags) const
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{
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if (aFlags & eBidiInlineContainer) {
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return false;
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}
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return nsInlineFrame::IsFrameOfType(aFlags);
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}
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#ifdef DEBUG_FRAME_DUMP
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nsresult
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nsRubyFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("Ruby"), aResult);
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}
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#endif
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/* virtual */ void
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nsRubyFrame::AddInlineMinISize(nsRenderingContext *aRenderingContext,
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nsIFrame::InlineMinISizeData *aData)
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{
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for (nsIFrame* frame = this; frame; frame = frame->GetNextInFlow()) {
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for (RubySegmentEnumerator e(static_cast<nsRubyFrame*>(frame));
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!e.AtEnd(); e.Next()) {
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e.GetBaseContainer()->AddInlineMinISize(aRenderingContext, aData);
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}
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}
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}
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/* virtual */ void
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nsRubyFrame::AddInlinePrefISize(nsRenderingContext *aRenderingContext,
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nsIFrame::InlinePrefISizeData *aData)
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{
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for (nsIFrame* frame = this; frame; frame = frame->GetNextInFlow()) {
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for (RubySegmentEnumerator e(static_cast<nsRubyFrame*>(frame));
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!e.AtEnd(); e.Next()) {
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e.GetBaseContainer()->AddInlinePrefISize(aRenderingContext, aData);
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}
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}
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}
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static nsRubyBaseContainerFrame*
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FindRubyBaseContainerAncestor(nsIFrame* aFrame)
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{
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for (nsIFrame* ancestor = aFrame->GetParent();
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ancestor && ancestor->IsFrameOfType(nsIFrame::eLineParticipant);
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ancestor = ancestor->GetParent()) {
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if (ancestor->GetType() == nsGkAtoms::rubyBaseContainerFrame) {
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return static_cast<nsRubyBaseContainerFrame*>(ancestor);
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}
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}
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return nullptr;
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}
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/* virtual */ void
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nsRubyFrame::Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus)
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{
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MarkInReflow();
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DO_GLOBAL_REFLOW_COUNT("nsRubyFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
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if (!aReflowInput.mLineLayout) {
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NS_ASSERTION(aReflowInput.mLineLayout,
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"No line layout provided to RubyFrame reflow method.");
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aStatus = NS_FRAME_COMPLETE;
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return;
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}
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// Grab overflow frames from prev-in-flow and its own.
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MoveOverflowToChildList();
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// Clear leadings
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mLeadings.Reset();
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// Begin the span for the ruby frame
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WritingMode frameWM = aReflowInput.GetWritingMode();
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WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
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LogicalMargin borderPadding = aReflowInput.ComputedLogicalBorderPadding();
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nscoord startEdge = 0;
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const bool boxDecorationBreakClone =
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StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Clone;
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if (boxDecorationBreakClone || !GetPrevContinuation()) {
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startEdge = borderPadding.IStart(frameWM);
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}
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NS_ASSERTION(aReflowInput.AvailableISize() != NS_UNCONSTRAINEDSIZE,
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"should no longer use available widths");
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nscoord availableISize = aReflowInput.AvailableISize();
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availableISize -= startEdge + borderPadding.IEnd(frameWM);
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aReflowInput.mLineLayout->BeginSpan(this, &aReflowInput,
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startEdge, availableISize, &mBaseline);
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aStatus = NS_FRAME_COMPLETE;
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for (RubySegmentEnumerator e(this); !e.AtEnd(); e.Next()) {
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ReflowSegment(aPresContext, aReflowInput, e.GetBaseContainer(), aStatus);
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if (NS_INLINE_IS_BREAK(aStatus)) {
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// A break occurs when reflowing the segment.
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// Don't continue reflowing more segments.
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break;
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}
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}
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ContinuationTraversingState pullState(this);
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while (aStatus == NS_FRAME_COMPLETE) {
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nsRubyBaseContainerFrame* baseContainer =
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PullOneSegment(aReflowInput.mLineLayout, pullState);
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if (!baseContainer) {
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// No more continuations after, finish now.
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break;
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}
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ReflowSegment(aPresContext, aReflowInput, baseContainer, aStatus);
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}
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// We never handle overflow in ruby.
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MOZ_ASSERT(!NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus));
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aDesiredSize.ISize(lineWM) = aReflowInput.mLineLayout->EndSpan(this);
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if (boxDecorationBreakClone || !GetPrevContinuation()) {
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aDesiredSize.ISize(lineWM) += borderPadding.IStart(frameWM);
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}
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if (boxDecorationBreakClone || NS_FRAME_IS_COMPLETE(aStatus)) {
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aDesiredSize.ISize(lineWM) += borderPadding.IEnd(frameWM);
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}
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// Update descendant leadings of ancestor ruby base container.
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if (nsRubyBaseContainerFrame* rbc = FindRubyBaseContainerAncestor(this)) {
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rbc->UpdateDescendantLeadings(mLeadings);
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}
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nsLayoutUtils::SetBSizeFromFontMetrics(this, aDesiredSize,
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borderPadding, lineWM, frameWM);
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}
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void
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nsRubyFrame::ReflowSegment(nsPresContext* aPresContext,
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const ReflowInput& aReflowInput,
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nsRubyBaseContainerFrame* aBaseContainer,
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nsReflowStatus& aStatus)
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{
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WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
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LogicalSize availSize(lineWM, aReflowInput.AvailableISize(),
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aReflowInput.AvailableBSize());
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WritingMode rubyWM = GetWritingMode();
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NS_ASSERTION(!rubyWM.IsOrthogonalTo(lineWM),
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"Ruby frame writing-mode shouldn't be orthogonal to its line");
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AutoRubyTextContainerArray textContainers(aBaseContainer);
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const uint32_t rtcCount = textContainers.Length();
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ReflowOutput baseMetrics(aReflowInput);
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bool pushedFrame;
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aReflowInput.mLineLayout->ReflowFrame(aBaseContainer, aStatus,
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&baseMetrics, pushedFrame);
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if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) {
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if (aBaseContainer != mFrames.FirstChild()) {
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// Some segments may have been reflowed before, hence it is not
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// a break-before for the ruby container.
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aStatus = NS_INLINE_LINE_BREAK_AFTER(NS_FRAME_NOT_COMPLETE);
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PushChildren(aBaseContainer, aBaseContainer->GetPrevSibling());
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aReflowInput.mLineLayout->SetDirtyNextLine();
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}
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// This base container is not placed at all, we can skip all
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// text containers paired with it.
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return;
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}
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if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
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// It always promise that if the status is incomplete, there is a
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// break occurs. Break before has been processed above. However,
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// it is possible that break after happens with the frame reflow
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// completed. It happens if there is a force break at the end.
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MOZ_ASSERT(NS_INLINE_IS_BREAK_AFTER(aStatus));
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// Find the previous sibling which we will
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// insert new continuations after.
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nsIFrame* lastChild;
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if (rtcCount > 0) {
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lastChild = textContainers.LastElement();
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} else {
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lastChild = aBaseContainer;
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}
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// Create continuations for the base container
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nsIFrame* newBaseContainer = CreateNextInFlow(aBaseContainer);
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// newBaseContainer is null if there are existing next-in-flows.
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// We only need to move and push if there were not.
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if (newBaseContainer) {
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// Move the new frame after all the text containers
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mFrames.RemoveFrame(newBaseContainer);
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mFrames.InsertFrame(nullptr, lastChild, newBaseContainer);
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// Create continuations for text containers
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nsIFrame* newLastChild = newBaseContainer;
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for (uint32_t i = 0; i < rtcCount; i++) {
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nsIFrame* newTextContainer = CreateNextInFlow(textContainers[i]);
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MOZ_ASSERT(newTextContainer, "Next-in-flow of rtc should not exist "
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"if the corresponding rbc does not");
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mFrames.RemoveFrame(newTextContainer);
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mFrames.InsertFrame(nullptr, newLastChild, newTextContainer);
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newLastChild = newTextContainer;
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}
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}
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if (lastChild != mFrames.LastChild()) {
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// Always push the next frame after the last child in this segment.
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// It is possible that we pulled it back before our next-in-flow
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// drain our overflow.
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PushChildren(lastChild->GetNextSibling(), lastChild);
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aReflowInput.mLineLayout->SetDirtyNextLine();
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}
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} else {
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// If the ruby base container is reflowed completely, the line
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// layout will remove the next-in-flows of that frame. But the
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// line layout is not aware of the ruby text containers, hence
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// it is necessary to remove them here.
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for (uint32_t i = 0; i < rtcCount; i++) {
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nsIFrame* nextRTC = textContainers[i]->GetNextInFlow();
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if (nextRTC) {
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nextRTC->GetParent()->DeleteNextInFlowChild(nextRTC, true);
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}
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}
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}
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nscoord segmentISize = baseMetrics.ISize(lineWM);
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const nsSize dummyContainerSize;
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LogicalRect baseRect =
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aBaseContainer->GetLogicalRect(lineWM, dummyContainerSize);
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// We need to position our rtc frames on one side or the other of the
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// base container's rect, using a coordinate space that's relative to
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// the ruby frame. Right now, the base container's rect's block-axis
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// position is relative to the block container frame containing the
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// lines, so we use 0 instead. (i.e. we assume that the base container
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// is adjacent to the ruby frame's block-start edge.)
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// XXX We may need to add border/padding here. See bug 1055667.
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baseRect.BStart(lineWM) = 0;
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// The rect for offsets of text containers.
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LogicalRect offsetRect = baseRect;
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RubyBlockLeadings descLeadings = aBaseContainer->GetDescendantLeadings();
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offsetRect.BStart(lineWM) -= descLeadings.mStart;
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offsetRect.BSize(lineWM) += descLeadings.mStart + descLeadings.mEnd;
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for (uint32_t i = 0; i < rtcCount; i++) {
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nsRubyTextContainerFrame* textContainer = textContainers[i];
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WritingMode rtcWM = textContainer->GetWritingMode();
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nsReflowStatus textReflowStatus;
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ReflowOutput textMetrics(aReflowInput);
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ReflowInput textReflowInput(aPresContext, aReflowInput, textContainer,
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availSize.ConvertTo(rtcWM, lineWM));
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// FIXME We probably shouldn't be using the same nsLineLayout for
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// the text containers. But it should be fine now as we are
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// not actually using this line layout to reflow something,
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// but just read the writing mode from it.
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textReflowInput.mLineLayout = aReflowInput.mLineLayout;
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textContainer->Reflow(aPresContext, textMetrics,
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textReflowInput, textReflowStatus);
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// Ruby text containers always return NS_FRAME_COMPLETE even when
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// they have continuations, because the breaking has already been
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// handled when reflowing the base containers.
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NS_ASSERTION(textReflowStatus == NS_FRAME_COMPLETE,
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"Ruby text container must not break itself inside");
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// The metrics is initialized with reflow state of this ruby frame,
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// hence the writing-mode is tied to rubyWM instead of rtcWM.
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LogicalSize size = textMetrics.Size(rubyWM).ConvertTo(lineWM, rubyWM);
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textContainer->SetSize(lineWM, size);
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nscoord reservedISize = RubyUtils::GetReservedISize(textContainer);
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segmentISize = std::max(segmentISize, size.ISize(lineWM) + reservedISize);
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uint8_t rubyPosition = textContainer->StyleText()->mRubyPosition;
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MOZ_ASSERT(rubyPosition == NS_STYLE_RUBY_POSITION_OVER ||
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rubyPosition == NS_STYLE_RUBY_POSITION_UNDER);
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Maybe<LogicalSide> side;
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if (rubyPosition == NS_STYLE_RUBY_POSITION_OVER) {
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side.emplace(lineWM.LogicalSideForLineRelativeDir(eLineRelativeDirOver));
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} else if (rubyPosition == NS_STYLE_RUBY_POSITION_UNDER) {
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side.emplace(lineWM.LogicalSideForLineRelativeDir(eLineRelativeDirUnder));
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} else {
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// XXX inter-character support in bug 1055672
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MOZ_ASSERT_UNREACHABLE("Unsupported ruby-position");
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}
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LogicalPoint position(lineWM);
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if (side.isSome()) {
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if (side.value() == eLogicalSideBStart) {
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offsetRect.BStart(lineWM) -= size.BSize(lineWM);
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offsetRect.BSize(lineWM) += size.BSize(lineWM);
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position = offsetRect.Origin(lineWM);
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} else if (side.value() == eLogicalSideBEnd) {
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position = offsetRect.Origin(lineWM) +
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LogicalPoint(lineWM, 0, offsetRect.BSize(lineWM));
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offsetRect.BSize(lineWM) += size.BSize(lineWM);
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} else {
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MOZ_ASSERT_UNREACHABLE("???");
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}
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}
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// Using a dummy container-size here, so child positioning may not be
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// correct. We will fix it in nsLineLayout after the whole line is
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// reflowed.
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FinishReflowChild(textContainer, aPresContext, textMetrics,
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&textReflowInput, lineWM, position, dummyContainerSize, 0);
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}
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MOZ_ASSERT(baseRect.ISize(lineWM) == offsetRect.ISize(lineWM),
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"Annotations should only be placed on the block directions");
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nscoord deltaISize = segmentISize - baseMetrics.ISize(lineWM);
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if (deltaISize <= 0) {
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RubyUtils::ClearReservedISize(aBaseContainer);
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} else {
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RubyUtils::SetReservedISize(aBaseContainer, deltaISize);
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aReflowInput.mLineLayout->AdvanceICoord(deltaISize);
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}
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// Set block leadings of the base container
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nscoord startLeading = baseRect.BStart(lineWM) - offsetRect.BStart(lineWM);
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nscoord endLeading = offsetRect.BEnd(lineWM) - baseRect.BEnd(lineWM);
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// XXX When bug 765861 gets fixed, this warning should be upgraded.
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NS_WARNING_ASSERTION(startLeading >= 0 && endLeading >= 0,
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"Leadings should be non-negative (because adding "
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"ruby annotation can only increase the size)");
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mLeadings.Update(startLeading, endLeading);
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}
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nsRubyBaseContainerFrame*
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nsRubyFrame::PullOneSegment(const nsLineLayout* aLineLayout,
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ContinuationTraversingState& aState)
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{
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// Pull a ruby base container
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nsIFrame* baseFrame = GetNextInFlowChild(aState);
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if (!baseFrame) {
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return nullptr;
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}
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MOZ_ASSERT(baseFrame->GetType() == nsGkAtoms::rubyBaseContainerFrame);
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// Get the float containing block of the base frame before we pull it.
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nsBlockFrame* oldFloatCB =
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nsLayoutUtils::GetFloatContainingBlock(baseFrame);
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PullNextInFlowChild(aState);
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// Pull all ruby text containers following the base container
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nsIFrame* nextFrame;
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while ((nextFrame = GetNextInFlowChild(aState)) != nullptr &&
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nextFrame->GetType() == nsGkAtoms::rubyTextContainerFrame) {
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PullNextInFlowChild(aState);
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}
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if (nsBlockFrame* newFloatCB =
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nsLayoutUtils::GetAsBlock(aLineLayout->LineContainerFrame())) {
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if (oldFloatCB && oldFloatCB != newFloatCB) {
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newFloatCB->ReparentFloats(baseFrame, oldFloatCB, true);
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}
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}
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return static_cast<nsRubyBaseContainerFrame*>(baseFrame);
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}
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