layout/generic/nsRubyTextFrame.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* rendering object for CSS "display: ruby-text" */
   8
   9 #include "nsRubyTextFrame.h"
  10
  11 #include "mozilla/ComputedStyle.h"
  12 #include "mozilla/PresShell.h"
  13 #include "mozilla/WritingModes.h"
  14 #include "nsLineLayout.h"
  15 #include "nsPresContext.h"
  16
  17 using namespace mozilla;
  18
  19 //----------------------------------------------------------------------
  20
  21 // Frame class boilerplate
  22 // =======================
  23
  24 NS_QUERYFRAME_HEAD(nsRubyTextFrame)
  25   NS_QUERYFRAME_ENTRY(nsRubyTextFrame)
  26 NS_QUERYFRAME_TAIL_INHERITING(nsRubyContentFrame)
  27
  28 NS_IMPL_FRAMEARENA_HELPERS(nsRubyTextFrame)
  29
  30 nsContainerFrame* NS_NewRubyTextFrame(PresShell* aPresShell,
  31                                       ComputedStyle* aStyle) {
  32   return new (aPresShell) nsRubyTextFrame(aStyle, aPresShell->GetPresContext());
  33 }
  34
  35 //----------------------------------------------------------------------
  36
  37 // nsRubyTextFrame Method Implementations
  38 // ======================================
  39
  40 /* virtual */
  41 bool nsRubyTextFrame::CanContinueTextRun() const { return false; }
  42
  43 #ifdef DEBUG_FRAME_DUMP
  44 nsresult nsRubyTextFrame::GetFrameName(nsAString& aResult) const {
  45   return MakeFrameName(u"RubyText"_ns, aResult);
  46 }
  47 #endif
  48
  49 /* virtual */
  50 void nsRubyTextFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
  51                                        const nsDisplayListSet& aLists) {
  52   if (IsCollapsed()) {
  53     return;
  54   }
  55
  56   nsRubyContentFrame::BuildDisplayList(aBuilder, aLists);
  57 }
  58
  59 /* virtual */
  60 void nsRubyTextFrame::Reflow(nsPresContext* aPresContext,
  61                              ReflowOutput& aDesiredSize,
  62                              const ReflowInput& aReflowInput,
  63                              nsReflowStatus& aStatus) {
  64   // Even if we want to hide this frame, we have to reflow it first.
  65   // If we leave it dirty, changes to its content will never be
  66   // propagated to the ancestors, then it won't be displayed even if
  67   // the content is no longer the same, until next reflow triggered by
  68   // some other change. In general, we always reflow all the frames we
  69   // created. There might be other problems if we don't do that.
  70   nsRubyContentFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
  71
  72   if (IsCollapsed()) {
  73     // Reset the ISize. The BSize is not changed so that it won't
  74     // affect vertical positioning in unexpected way.
  75     WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
  76     aDesiredSize.ISize(lineWM) = 0;
  77     aDesiredSize.SetOverflowAreasToDesiredBounds();
  78   }
  79 }