layout/generic/nsFirstLetterFrame.h

   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 #ifndef nsFirstLetterFrame_h__
   8 #define nsFirstLetterFrame_h__
   9
  10 /* rendering object for CSS :first-letter pseudo-element */
  11
  12 #include "nsContainerFrame.h"
  13
  14 class nsFirstLetterFrame : public nsContainerFrame {
  15  public:
  16   NS_DECL_QUERYFRAME
  17   NS_DECL_FRAMEARENA_HELPERS(nsFirstLetterFrame)
  18
  19   nsFirstLetterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
  20                      ClassID aClassID)
  21       : nsContainerFrame(aStyle, aPresContext, aClassID) {}
  22
  23   nsFirstLetterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  24       : nsContainerFrame(aStyle, aPresContext, kClassID) {}
  25
  26   void BuildDisplayList(nsDisplayListBuilder* aBuilder,
  27                         const nsDisplayListSet& aLists) final;
  28
  29   void Init(nsIContent* aContent, nsContainerFrame* aParent,
  30             nsIFrame* aPrevInFlow) final;
  31   void SetInitialChildList(ChildListID aListID, nsFrameList&& aChildList) final;
  32 #ifdef DEBUG_FRAME_DUMP
  33   nsresult GetFrameName(nsAString& aResult) const final;
  34 #endif
  35
  36   bool IsFloating() const { return HasAnyStateBits(NS_FRAME_OUT_OF_FLOW); }
  37
  38   nscoord GetMinISize(gfxContext* aRenderingContext) final;
  39   nscoord GetPrefISize(gfxContext* aRenderingContext) final;
  40   void AddInlineMinISize(gfxContext* aRenderingContext,
  41                          InlineMinISizeData* aData) final;
  42   void AddInlinePrefISize(gfxContext* aRenderingContext,
  43                           InlinePrefISizeData* aData) final;
  44
  45   SizeComputationResult ComputeSize(
  46       gfxContext* aRenderingContext, mozilla::WritingMode aWM,
  47       const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
  48       const mozilla::LogicalSize& aMargin,
  49       const mozilla::LogicalSize& aBorderPadding,
  50       const mozilla::StyleSizeOverrides& aSizeOverrides,
  51       mozilla::ComputeSizeFlags aFlags) final;
  52
  53   void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
  54               const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;
  55
  56   bool CanContinueTextRun() const final;
  57   Maybe<nscoord> GetNaturalBaselineBOffset(mozilla::WritingMode aWM,
  58                                            BaselineSharingGroup aBaselineGroup,
  59                                            BaselineExportContext) const final;
  60   LogicalSides GetLogicalSkipSides() const final;
  61
  62   // final of nsFrame method
  63   nsresult GetChildFrameContainingOffset(int32_t inContentOffset, bool inHint,
  64                                          int32_t* outFrameContentOffset,
  65                                          nsIFrame** outChildFrame) final;
  66
  67   nscoord GetFirstLetterBaseline() const { return mBaseline; }
  68
  69   // For floating first letter frames, create a continuation for aChild and
  70   // place it in the correct place. aContinuation is an outparam for the
  71   // continuation that is created. aIsFluid determines if the continuation is
  72   // fluid or not.
  73   void CreateContinuationForFloatingParent(nsIFrame* aChild,
  74                                            nsIFrame** aContinuation,
  75                                            bool aIsFluid);
  76
  77   // Whether to use tight glyph bounds for a floating first-letter frame,
  78   // or "loose" bounds based on font metrics rather than individual glyphs.
  79   bool UseTightBounds() const;
  80
  81  protected:
  82   nscoord mBaseline;
  83
  84   void DrainOverflowFrames(nsPresContext* aPresContext);
  85 };
  86
  87 class nsFloatingFirstLetterFrame : public nsFirstLetterFrame {
  88  public:
  89   NS_DECL_QUERYFRAME
  90   NS_DECL_FRAMEARENA_HELPERS(nsFloatingFirstLetterFrame)
  91
  92   nsFloatingFirstLetterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  93       : nsFirstLetterFrame(aStyle, aPresContext, kClassID) {}
  94 };
  95
  96 #endif /* nsFirstLetterFrame_h__ */