gecko-dev/layout/generic/nsInlineFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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/. */
/* rendering object for CSS display:inline objects */
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#ifndef nsInlineFrame_h___
#define nsInlineFrame_h___
#include "nsContainerFrame.h"
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#include "nsLineLayout.h"
/** In Bidi left (or right) margin/padding/border should be applied to left
* (or right) most frame (or a continuation frame).
* This state value shows if this frame is left (or right) most continuation
* or not.
*/
#define NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET NS_FRAME_STATE_BIT(21)
#define NS_INLINE_FRAME_BIDI_VISUAL_IS_LEFT_MOST NS_FRAME_STATE_BIT(22)
#define NS_INLINE_FRAME_BIDI_VISUAL_IS_RIGHT_MOST NS_FRAME_STATE_BIT(23)
/**
* Inline frame class.
*
* This class manages a list of child frames that are inline frames. Working with
* nsLineLayout, the class will reflow and place inline frames on a line.
*/
class nsInlineFrame : public nsContainerFrame
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{
public:
NS_DECL_QUERYFRAME_TARGET(nsInlineFrame)
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
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friend nsIFrame* NS_NewInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
/** sets defaults for inline-specific style.
* @see nsIFrame::Init
*/
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
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// nsIFrame overrides
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
#ifdef ACCESSIBILITY
virtual already_AddRefed<Accessible> CreateAccessible();
#endif
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
virtual nsIAtom* GetType() const;
virtual bool IsFrameOfType(PRUint32 aFlags) const
{
return nsContainerFrame::IsFrameOfType(aFlags &
~(nsIFrame::eBidiInlineContainer | nsIFrame::eLineParticipant));
}
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virtual bool IsEmpty();
virtual bool IsSelfEmpty();
virtual void DestroyFrom(nsIFrame* aDestructRoot);
virtual bool PeekOffsetCharacter(bool aForward, PRInt32* aOffset,
bool aRespectClusters = true);
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// nsIHTMLReflow overrides
virtual void AddInlineMinWidth(nsRenderingContext *aRenderingContext,
InlineMinWidthData *aData);
virtual void AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
InlinePrefWidthData *aData);
virtual nsSize ComputeSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRUint32 aFlags) MOZ_OVERRIDE;
virtual nsRect ComputeTightBounds(gfxContext* aContext) const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual bool CanContinueTextRun() const;
virtual void PullOverflowsFromPrevInFlow();
virtual nscoord GetBaseline() const;
/**
* Return true if the frame is leftmost frame or continuation.
*/
bool IsLeftMost() const {
// If the frame's bidi visual state is set, return is-leftmost state
// else return true if it's the first continuation.
return (GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET)
? !!(GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_IS_LEFT_MOST)
: (!GetPrevInFlow());
}
/**
* Return true if the frame is rightmost frame or continuation.
*/
bool IsRightMost() const {
// If the frame's bidi visual state is set, return is-rightmost state
// else return true if it's the last continuation.
return (GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET)
? !!(GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_IS_RIGHT_MOST)
: (!GetNextInFlow());
}
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protected:
// Additional reflow state used during our reflow methods
struct InlineReflowState {
nsIFrame* mPrevFrame;
nsInlineFrame* mNextInFlow;
nsIFrame* mLineContainer;
nsLineLayout* mLineLayout;
bool mSetParentPointer; // when reflowing child frame first set its
// parent frame pointer
InlineReflowState() {
mPrevFrame = nullptr;
mNextInFlow = nullptr;
mLineContainer = nullptr;
mLineLayout = nullptr;
mSetParentPointer = false;
}
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};
nsInlineFrame(nsStyleContext* aContext) : nsContainerFrame(aContext) {}
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virtual PRIntn GetSkipSides() const;
nsresult ReflowFrames(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
InlineReflowState& rs,
nsHTMLReflowMetrics& aMetrics,
nsReflowStatus& aStatus);
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nsresult ReflowInlineFrame(nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
InlineReflowState& rs,
nsIFrame* aFrame,
nsReflowStatus& aStatus);
/**
* Reparent floats whose placeholders are inline descendants of aFrame from
* whatever block they're currently parented by to aOurBlock.
* @param aReparentSiblings if this is true, we follow aFrame's
* GetNextSibling chain reparenting them all
*/
void ReparentFloatsForInlineChild(nsIFrame* aOurBlock, nsIFrame* aFrame,
bool aReparentSiblings);
virtual nsIFrame* PullOneFrame(nsPresContext* aPresContext,
InlineReflowState& rs,
bool* aIsComplete);
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virtual void PushFrames(nsPresContext* aPresContext,
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nsIFrame* aFromChild,
nsIFrame* aPrevSibling,
InlineReflowState& aState);
nscoord mBaseline;
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};
//----------------------------------------------------------------------
/**
* Variation on inline-frame used to manage lines for line layout in
* special situations (:first-line style in particular).
*/
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class nsFirstLineFrame : public nsInlineFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
friend nsIFrame* NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
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#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
virtual nsIAtom* GetType() const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual void PullOverflowsFromPrevInFlow();
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protected:
nsFirstLineFrame(nsStyleContext* aContext) : nsInlineFrame(aContext) {}
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virtual nsIFrame* PullOneFrame(nsPresContext* aPresContext,
InlineReflowState& rs,
bool* aIsComplete);
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};
#endif /* nsInlineFrame_h___ */