gecko-dev/layout/generic/nsRubyBaseContainerFrame.cpp

225 строки
8.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code is subject to the terms of the Mozilla Public License
* version 2.0 (the "License"). You can obtain a copy of the License at
* http://mozilla.org/MPL/2.0/. */
/* rendering object for CSS "display: ruby-base-container" */
#include "nsRubyBaseContainerFrame.h"
#include "nsLineLayout.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "WritingModes.h"
using namespace mozilla;
//----------------------------------------------------------------------
// Frame class boilerplate
// =======================
NS_QUERYFRAME_HEAD(nsRubyBaseContainerFrame)
NS_QUERYFRAME_ENTRY(nsRubyBaseContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
NS_IMPL_FRAMEARENA_HELPERS(nsRubyBaseContainerFrame)
nsContainerFrame*
NS_NewRubyBaseContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext)
{
return new (aPresShell) nsRubyBaseContainerFrame(aContext);
}
//----------------------------------------------------------------------
// nsRubyBaseContainerFrame Method Implementations
// ===============================================
nsIAtom*
nsRubyBaseContainerFrame::GetType() const
{
return nsGkAtoms::rubyBaseContainerFrame;
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsRubyBaseContainerFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("RubyBaseContainer"), aResult);
}
#endif
/* virtual */ bool
nsRubyBaseContainerFrame::IsFrameOfType(uint32_t aFlags) const
{
return nsContainerFrame::IsFrameOfType(aFlags &
~(nsIFrame::eLineParticipant));
}
void nsRubyBaseContainerFrame::AppendTextContainer(nsIFrame* aFrame)
{
nsRubyTextContainerFrame* rtcFrame = do_QueryFrame(aFrame);
if (rtcFrame) {
mTextContainers.AppendElement(rtcFrame);
}
}
void nsRubyBaseContainerFrame::ClearTextContainers() {
mTextContainers.Clear();
}
/* virtual */ bool
nsRubyBaseContainerFrame::CanContinueTextRun() const
{
return true;
}
/* virtual */ void
nsRubyBaseContainerFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsRubyBaseContainerFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
if (!aReflowState.mLineLayout) {
NS_ASSERTION(
aReflowState.mLineLayout,
"No line layout provided to RubyBaseContainerFrame reflow method.");
aStatus = NS_FRAME_COMPLETE;
return;
}
aStatus = NS_FRAME_COMPLETE;
nscoord isize = 0;
int baseNum = 0;
nscoord leftoverSpace = 0;
nscoord spaceApart = 0;
WritingMode lineWM = aReflowState.mLineLayout->GetWritingMode();
WritingMode frameWM = aReflowState.GetWritingMode();
LogicalMargin borderPadding =
aReflowState.ComputedLogicalBorderPadding();
nscoord baseStart = 0;
LogicalSize availSize(lineWM, aReflowState.AvailableWidth(),
aReflowState.AvailableHeight());
// Begin the line layout for each ruby text container in advance.
for (uint32_t i = 0; i < mTextContainers.Length(); i++) {
nsRubyTextContainerFrame* rtcFrame = mTextContainers.ElementAt(i);
nsHTMLReflowState rtcReflowState(aPresContext,
*aReflowState.parentReflowState,
rtcFrame, availSize);
rtcReflowState.mLineLayout = aReflowState.mLineLayout;
// FIXME: Avoid using/needing the rtcReflowState argument
rtcFrame->BeginRTCLineLayout(aPresContext, rtcReflowState);
}
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
nsIFrame* rbFrame = e.get();
if (rbFrame->GetType() != nsGkAtoms::rubyBaseFrame) {
NS_ASSERTION(false, "Unrecognized child type for ruby base container");
continue;
}
nsReflowStatus frameReflowStatus;
nsHTMLReflowMetrics metrics(aReflowState, aDesiredSize.mFlags);
// Determine if we need more spacing between bases in the inline direction
// depending on the inline size of the corresponding annotations
// FIXME: The use of GetPrefISize here and below is easier but not ideal. It
// would be better to use metrics from reflow.
nscoord prefWidth = rbFrame->GetPrefISize(aReflowState.rendContext);
nscoord textWidth = 0;
for (uint32_t i = 0; i < mTextContainers.Length(); i++) {
nsRubyTextFrame* rtFrame = do_QueryFrame(mTextContainers.ElementAt(i)->
PrincipalChildList().FrameAt(baseNum));
if (rtFrame) {
int newWidth = rtFrame->GetPrefISize(aReflowState.rendContext);
if (newWidth > textWidth) {
textWidth = newWidth;
}
}
}
if (textWidth > prefWidth) {
spaceApart = std::max((textWidth - prefWidth) / 2, spaceApart);
leftoverSpace = spaceApart;
} else {
spaceApart = leftoverSpace;
leftoverSpace = 0;
}
if (spaceApart > 0) {
aReflowState.mLineLayout->AdvanceICoord(spaceApart);
}
baseStart = aReflowState.mLineLayout->GetCurrentICoord();
bool pushedFrame;
aReflowState.mLineLayout->ReflowFrame(rbFrame, frameReflowStatus,
&metrics, pushedFrame);
NS_ASSERTION(!pushedFrame, "Ruby line breaking is not yet implemented");
isize += metrics.ISize(lineWM);
rbFrame->SetSize(LogicalSize(lineWM, metrics.ISize(lineWM),
metrics.BSize(lineWM)));
FinishReflowChild(rbFrame, aPresContext, metrics, &aReflowState, 0, 0,
NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_MOVE_VIEW);
// Now reflow the ruby text boxes that correspond to this ruby base box.
for (uint32_t i = 0; i < mTextContainers.Length(); i++) {
nsRubyTextFrame* rtFrame = do_QueryFrame(mTextContainers.ElementAt(i)->
PrincipalChildList().FrameAt(baseNum));
nsRubyTextContainerFrame* rtcFrame = mTextContainers.ElementAt(i);
if (rtFrame) {
nsHTMLReflowMetrics rtcMetrics(*aReflowState.parentReflowState,
aDesiredSize.mFlags);
nsHTMLReflowState rtcReflowState(aPresContext,
*aReflowState.parentReflowState,
rtcFrame, availSize);
rtcReflowState.mLineLayout = rtcFrame->GetLineLayout();
rtcFrame->ReflowRubyTextFrame(rtFrame, rbFrame, baseStart,
aPresContext, rtcMetrics,
rtcReflowState);
}
}
baseNum++;
}
// Reflow ruby annotations which do not have a corresponding ruby base box due
// to a ruby base shortage. According to the spec, an empty ruby base is
// assumed to exist for each of these annotations.
bool continueReflow = true;
while (continueReflow) {
continueReflow = false;
for (uint32_t i = 0; i < mTextContainers.Length(); i++) {
nsRubyTextFrame* rtFrame = do_QueryFrame(mTextContainers.ElementAt(i)->
PrincipalChildList().FrameAt(baseNum));
nsRubyTextContainerFrame* rtcFrame = mTextContainers.ElementAt(i);
if (rtFrame) {
continueReflow = true;
nsHTMLReflowMetrics rtcMetrics(*aReflowState.parentReflowState,
aDesiredSize.mFlags);
nsHTMLReflowState rtcReflowState(aPresContext,
*aReflowState.parentReflowState,
rtcFrame, availSize);
rtcReflowState.mLineLayout = rtcFrame->GetLineLayout();
rtcFrame->ReflowRubyTextFrame(rtFrame, nullptr, baseStart,
aPresContext, rtcMetrics,
rtcReflowState);
// Update the inline coord to make space for subsequent ruby annotations
// (since there is no corresponding base inline size to use).
baseStart += rtcMetrics.ISize(lineWM);
}
}
baseNum++;
}
aDesiredSize.ISize(lineWM) = isize;
nsLayoutUtils::SetBSizeFromFontMetrics(this, aDesiredSize, aReflowState,
borderPadding, lineWM, frameWM);
}