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https://gitlab.winehq.org/wine/wine-gecko.git
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d4c7a65b4c
To account for spacing between bases or text boxes during reflow, the line layout which manages the bases updates its inline direction coordinate based on the preferred inline size for the corresponding text boxes. Next, the base is reflowed at the correct inline coordinate. Each paired text box is then also reflowed at the proper inline position determined by (1) the current position of its corresponding base and (2) its own preferred width. In computing intrinsic widths, accounting for spacing is less complicated. The minimum intrinsic width is the width of the widest ruby column, and the preferred intrinsic width is the sum of all the ruby column widths. Each ruby column width is the maximum width of its base box and text boxes. These individual widths are determined using GetPrefISize on the base and text boxes. Ruby base container frames store a list of pointers to the ruby text container frames in the segment they denote. This list of pointers is created in the ruby frame reflow method before calling the reflow method for the ruby base container. The list exists and is used only during reflow of the main ruby frame and is cleared before returning from reflow.
180 lines
6.3 KiB
C++
180 lines
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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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-text-container" */
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#include "nsRubyTextContainerFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "WritingModes.h"
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#include "mozilla/UniquePtr.h"
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//----------------------------------------------------------------------
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// Frame class boilerplate
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// =======================
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NS_QUERYFRAME_HEAD(nsRubyTextContainerFrame)
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NS_QUERYFRAME_ENTRY(nsRubyTextContainerFrame)
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NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame)
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NS_IMPL_FRAMEARENA_HELPERS(nsRubyTextContainerFrame)
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nsContainerFrame*
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NS_NewRubyTextContainerFrame(nsIPresShell* aPresShell,
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nsStyleContext* aContext)
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{
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return new (aPresShell) nsRubyTextContainerFrame(aContext);
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}
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//----------------------------------------------------------------------
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// nsRubyTextContainerFrame Method Implementations
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// ===============================================
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nsIAtom*
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nsRubyTextContainerFrame::GetType() const
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{
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return nsGkAtoms::rubyTextContainerFrame;
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}
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#ifdef DEBUG_FRAME_DUMP
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nsresult
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nsRubyTextContainerFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("RubyTextContainer"), aResult);
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}
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#endif
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void
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nsRubyTextContainerFrame::BeginRTCLineLayout(nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState)
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{
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// Construct block reflow state and line layout
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nscoord consumedBSize = GetConsumedBSize();
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ClearLineCursor();
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mISize = 0;
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nsBlockReflowState state(aReflowState, aPresContext, this, true, true,
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false, consumedBSize);
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NS_ASSERTION(!mLines.empty(),
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"There should be at least one line in the ruby text container");
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line_iterator firstLine = begin_lines();
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mLineLayout = mozilla::MakeUnique<nsLineLayout>(
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state.mPresContext,
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state.mReflowState.mFloatManager,
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&state.mReflowState, &firstLine);
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mLineLayout->Init(&state, state.mMinLineHeight, state.mLineNumber);
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mozilla::WritingMode lineWM = aReflowState.mLineLayout->GetWritingMode();
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mozilla::LogicalRect lineRect(state.mContentArea);
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nscoord iStart = lineRect.IStart(lineWM);
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nscoord availISize = lineRect.ISize(lineWM);
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nscoord availBSize = NS_UNCONSTRAINEDSIZE;
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mLineLayout->BeginLineReflow(iStart, state.mBCoord,
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availISize, availBSize,
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false,
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false,
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lineWM, state.mContainerWidth);
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}
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void
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nsRubyTextContainerFrame::ReflowRubyTextFrame(
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nsRubyTextFrame* rtFrame,
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nsIFrame* rbFrame,
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nscoord baseStart,
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nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState)
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{
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nsReflowStatus frameReflowStatus;
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nsHTMLReflowMetrics metrics(aReflowState, aDesiredSize.mFlags);
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mozilla::WritingMode lineWM = mLineLayout->GetWritingMode();
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mozilla::LogicalSize availSize(lineWM, aReflowState.AvailableWidth(),
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aReflowState.AvailableHeight());
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nsHTMLReflowState childReflowState(aPresContext, aReflowState, rtFrame, availSize);
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// Determine the inline coordinate for the text frame by centering over
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// the corresponding base frame
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int baseWidth;
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if (rbFrame) {
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baseWidth = rbFrame->ISize();
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// If this is the last ruby annotation, it gets paired with ALL remaining
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// ruby bases
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if (!rtFrame->GetNextSibling()) {
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rbFrame = rbFrame->GetNextSibling();
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while (rbFrame) {
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baseWidth += rbFrame->ISize();
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rbFrame = rbFrame->GetNextSibling();
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}
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}
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} else {
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baseWidth = 0;
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}
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int baseCenter = baseStart + baseWidth / 2;
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// FIXME: Find a way to avoid using GetPrefISize here, potentially by moving
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// the frame after it has reflowed.
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nscoord ICoord = baseCenter - rtFrame->GetPrefISize(aReflowState.rendContext) / 2;
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if (ICoord > mLineLayout->GetCurrentICoord()) {
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mLineLayout->AdvanceICoord(ICoord - mLineLayout->GetCurrentICoord());
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}
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bool pushedFrame;
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mLineLayout->ReflowFrame(rtFrame, frameReflowStatus,
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&metrics, pushedFrame);
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NS_ASSERTION(!pushedFrame, "Ruby line breaking is not yet implemented");
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mISize += metrics.ISize(lineWM);
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rtFrame->SetSize(nsSize(metrics.ISize(lineWM), metrics.BSize(lineWM)));
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FinishReflowChild(rtFrame, aPresContext, metrics, &childReflowState, 0, 0,
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NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_MOVE_VIEW);
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}
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/* virtual */ void
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nsRubyTextContainerFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("nsRubyTextContainerFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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// All rt children have already been reflowed. All we need to do is clean up
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// the line layout.
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aStatus = NS_FRAME_COMPLETE;
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mozilla::WritingMode lineWM = aReflowState.mLineLayout->GetWritingMode();
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mozilla::WritingMode frameWM = aReflowState.GetWritingMode();
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mozilla::LogicalMargin borderPadding =
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aReflowState.ComputedLogicalBorderPadding();
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aDesiredSize.ISize(lineWM) = mISize;
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nsLayoutUtils::SetBSizeFromFontMetrics(this, aDesiredSize, aReflowState,
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borderPadding, lineWM, frameWM);
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nscoord bsize = aDesiredSize.BSize(lineWM);
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if (!mLines.empty()) {
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// Okay to use BlockStartAscent because it has just been correctly set by
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// nsLayoutUtils::SetBSizeFromFontMetrics.
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mLines.begin()->SetLogicalAscent(aDesiredSize.BlockStartAscent());
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mLines.begin()->SetBounds(aReflowState.GetWritingMode(), 0, 0, mISize,
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bsize, mISize);
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}
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if (mLineLayout) {
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mLineLayout->EndLineReflow();
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mLineLayout = nullptr;
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}
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}
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