nsFirstLetterFrame.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsFirstLetterFrame_h__

#define nsFirstLetterFrame_h__

/* rendering object for CSS :first-letter pseudo-element */

#include "nsContainerFrame.h"

class nsFirstLetterFrame : public nsContainerFrame {

 public:

  NS_DECL_QUERYFRAME

  NS_DECL_FRAMEARENA_HELPERS(nsFirstLetterFrame)

  nsFirstLetterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,

                     ClassID aClassID)

      : nsContainerFrame(aStyle, aPresContext, aClassID) {}

  nsFirstLetterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)

      : nsContainerFrame(aStyle, aPresContext, kClassID) {}

  void BuildDisplayList(nsDisplayListBuilder* aBuilder,

                        const nsDisplayListSet& aLists) final;

  void Init(nsIContent* aContent, nsContainerFrame* aParent,

            nsIFrame* aPrevInFlow) final;

  void SetInitialChildList(ChildListID aListID, nsFrameList&& aChildList) final;

#ifdef DEBUG_FRAME_DUMP

  nsresult GetFrameName(nsAString& aResult) const final;

#endif

  bool IsFloating() const { return HasAnyStateBits(NS_FRAME_OUT_OF_FLOW); }

  nscoord IntrinsicISize(const mozilla::IntrinsicSizeInput& aInput,

                         mozilla::IntrinsicISizeType aType) final;

  void AddInlineMinISize(const mozilla::IntrinsicSizeInput& aInput,

                         InlineMinISizeData* aData) final;

  void AddInlinePrefISize(const mozilla::IntrinsicSizeInput& aInput,

                          InlinePrefISizeData* aData) final;

  SizeComputationResult ComputeSize(

      gfxContext* aRenderingContext, mozilla::WritingMode aWM,

      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,

      const mozilla::LogicalSize& aMargin,

      const mozilla::LogicalSize& aBorderPadding,

      const mozilla::StyleSizeOverrides& aSizeOverrides,

      mozilla::ComputeSizeFlags aFlags) final;

  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,

              const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;

  bool CanContinueTextRun() const final;

  Maybe<nscoord> GetNaturalBaselineBOffset(mozilla::WritingMode aWM,

                                           BaselineSharingGroup aBaselineGroup,

                                           BaselineExportContext) const final;

  LogicalSides GetLogicalSkipSides() const final;

  // final of nsFrame method

  nsresult GetChildFrameContainingOffset(int32_t inContentOffset, bool inHint,

                                         int32_t* outFrameContentOffset,

                                         nsIFrame** outChildFrame) final;

  nscoord GetFirstLetterBaseline() const { return mBaseline; }

  // For floating first letter frames, create a continuation for aChild and

  // place it in the correct place. aContinuation is an outparam for the

  // continuation that is created. aIsFluid determines if the continuation is

  // fluid or not.

  void CreateContinuationForFloatingParent(nsIFrame* aChild,

                                           nsIFrame** aContinuation,

                                           bool aIsFluid);

  // Create a new continuation for the first-letter frame (to hold text that

  // is not part of the first-letter range), and move any frames after aFrame

  // to it; if there are none, create a new text continuation there instead.

  // Returns the first text frame of the new continuation.

  nsTextFrame* CreateContinuationForFramesAfter(nsTextFrame* aFrame);

  // Whether to use tight glyph bounds for a floating first-letter frame,

  // or "loose" bounds based on font metrics rather than individual glyphs.

  bool UseTightBounds() const;

 protected:

  nscoord mBaseline;

  void DrainOverflowFrames(nsPresContext* aPresContext);

};

class nsFloatingFirstLetterFrame : public nsFirstLetterFrame {

 public:

  NS_DECL_QUERYFRAME

  NS_DECL_FRAMEARENA_HELPERS(nsFloatingFirstLetterFrame)

  nsFloatingFirstLetterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)

      : nsFirstLetterFrame(aStyle, aPresContext, kClassID) {}

};

#endif /* nsFirstLetterFrame_h__ */