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Diffstat (limited to 'layout/generic/nsInlineFrame.h')
| -rw-r--r-- | layout/generic/nsInlineFrame.h | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/layout/generic/nsInlineFrame.h b/layout/generic/nsInlineFrame.h new file mode 100644 index 000000000..00f89065c --- /dev/null +++ b/layout/generic/nsInlineFrame.h @@ -0,0 +1,230 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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 */ + +#ifndef nsInlineFrame_h___ +#define nsInlineFrame_h___ + +#include "mozilla/Attributes.h" +#include "nsContainerFrame.h" + +class nsLineLayout; + +/** + * 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 +{ +public: + NS_DECL_QUERYFRAME_TARGET(nsInlineFrame) + NS_DECL_QUERYFRAME + NS_DECL_FRAMEARENA_HELPERS + + friend nsInlineFrame* NS_NewInlineFrame(nsIPresShell* aPresShell, + nsStyleContext* aContext); + + // nsIFrame overrides + virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder, + const nsRect& aDirtyRect, + const nsDisplayListSet& aLists) override; + +#ifdef ACCESSIBILITY + virtual mozilla::a11y::AccType AccessibleType() override; +#endif + +#ifdef DEBUG_FRAME_DUMP + virtual nsresult GetFrameName(nsAString& aResult) const override; +#endif + virtual nsIAtom* GetType() const override; + + virtual bool IsFrameOfType(uint32_t aFlags) const override + { + if (aFlags & eSupportsCSSTransforms) { + return false; + } + return nsContainerFrame::IsFrameOfType(aFlags & + ~(nsIFrame::eBidiInlineContainer | nsIFrame::eLineParticipant)); + } + + virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) override; + virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) override; + + virtual bool IsEmpty() override; + virtual bool IsSelfEmpty() override; + + virtual FrameSearchResult PeekOffsetCharacter(bool aForward, int32_t* aOffset, + bool aRespectClusters = true) override; + + virtual void DestroyFrom(nsIFrame* aDestructRoot) override; + virtual nsresult StealFrame(nsIFrame* aChild) override; + + // nsIHTMLReflow overrides + virtual void AddInlineMinISize(nsRenderingContext *aRenderingContext, + InlineMinISizeData *aData) override; + virtual void AddInlinePrefISize(nsRenderingContext *aRenderingContext, + InlinePrefISizeData *aData) override; + virtual mozilla::LogicalSize + ComputeSize(nsRenderingContext *aRenderingContext, + mozilla::WritingMode aWritingMode, + const mozilla::LogicalSize& aCBSize, + nscoord aAvailableISize, + const mozilla::LogicalSize& aMargin, + const mozilla::LogicalSize& aBorder, + const mozilla::LogicalSize& aPadding, + ComputeSizeFlags aFlags) override; + virtual nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override; + virtual void Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) override; + + virtual nsresult AttributeChanged(int32_t aNameSpaceID, + nsIAtom* aAttribute, + int32_t aModType) override; + + virtual bool CanContinueTextRun() const override; + + virtual void PullOverflowsFromPrevInFlow() override; + virtual nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const override; + virtual bool DrainSelfOverflowList() override; + + /** + * Return true if the frame is first visual frame or first continuation + */ + bool IsFirst() const { + // If the frame's bidi visual state is set, return is-first 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_FIRST) + : (!GetPrevInFlow()); + } + + /** + * Return true if the frame is last visual frame or last continuation. + */ + bool IsLast() const { + // If the frame's bidi visual state is set, return is-last 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_LAST) + : (!GetNextInFlow()); + } + +protected: + // Additional reflow state used during our reflow methods + struct InlineReflowInput { + nsIFrame* mPrevFrame; + nsInlineFrame* mNextInFlow; + nsIFrame* mLineContainer; + nsLineLayout* mLineLayout; + bool mSetParentPointer; // when reflowing child frame first set its + // parent frame pointer + + InlineReflowInput() { + mPrevFrame = nullptr; + mNextInFlow = nullptr; + mLineContainer = nullptr; + mLineLayout = nullptr; + mSetParentPointer = false; + } + }; + + explicit nsInlineFrame(nsStyleContext* aContext) : nsContainerFrame(aContext) {} + + virtual LogicalSides GetLogicalSkipSides(const ReflowInput* aReflowInput = nullptr) const override; + + void ReflowFrames(nsPresContext* aPresContext, + const ReflowInput& aReflowInput, + InlineReflowInput& rs, + ReflowOutput& aMetrics, + nsReflowStatus& aStatus); + + void ReflowInlineFrame(nsPresContext* aPresContext, + const ReflowInput& aReflowInput, + InlineReflowInput& 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, + InlineReflowInput& rs, + bool* aIsComplete); + + virtual void PushFrames(nsPresContext* aPresContext, + nsIFrame* aFromChild, + nsIFrame* aPrevSibling, + InlineReflowInput& aState); + +private: + // Helper method for DrainSelfOverflowList() to deal with lazy parenting + // (which we only do for nsInlineFrame, not nsFirstLineFrame). + enum DrainFlags { + eDontReparentFrames = 1, // skip reparenting the overflow list frames + eInFirstLine = 2, // the request is for an inline descendant of a nsFirstLineFrame + eForDestroy = 4, // the request is from DestroyFrom; in this case we do the + // minimal work required since the frame is about to be + // destroyed (just fixup parent pointers) + }; + /** + * Move any frames on our overflow list to the end of our principal list. + * @param aFlags one or more of the above DrainFlags + * @param aLineContainer the nearest line container ancestor + * @return true if there were any overflow frames + */ + bool DrainSelfOverflowListInternal(DrainFlags aFlags, + nsIFrame* aLineContainer); +protected: + nscoord mBaseline; +}; + +//---------------------------------------------------------------------- + +/** + * Variation on inline-frame used to manage lines for line layout in + * special situations (:first-line style in particular). + */ +class nsFirstLineFrame final : public nsInlineFrame { +public: + NS_DECL_FRAMEARENA_HELPERS + + friend nsFirstLineFrame* NS_NewFirstLineFrame(nsIPresShell* aPresShell, + nsStyleContext* aContext); + +#ifdef DEBUG_FRAME_DUMP + virtual nsresult GetFrameName(nsAString& aResult) const override; +#endif + virtual nsIAtom* GetType() const override; + virtual void Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) override; + + virtual void Init(nsIContent* aContent, + nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) override; + virtual void PullOverflowsFromPrevInFlow() override; + virtual bool DrainSelfOverflowList() override; + +protected: + explicit nsFirstLineFrame(nsStyleContext* aContext) : nsInlineFrame(aContext) {} + + virtual nsIFrame* PullOneFrame(nsPresContext* aPresContext, + InlineReflowInput& rs, + bool* aIsComplete) override; +}; + +#endif /* nsInlineFrame_h___ */ |