зеркало из https://github.com/mozilla/gecko-dev.git
505 строки
22 KiB
C++
505 строки
22 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsMathMLContainerFrame_h___
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#define nsMathMLContainerFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsContainerFrame.h"
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#include "nsBlockFrame.h"
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#include "nsInlineFrame.h"
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#include "nsMathMLOperators.h"
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#include "nsMathMLFrame.h"
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#include "mozilla/Likely.h"
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namespace mozilla {
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class PresShell;
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} // namespace mozilla
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/*
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* Base class for MathML container frames. It acts like an inferred
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* mrow. By default, this frame uses its Reflow() method to lay its
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* children horizontally and ensure that their baselines are aligned.
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* The Reflow() method relies upon Place() to position children.
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* By overloading Place() in derived classes, it is therefore possible
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* to position children in various customized ways.
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*/
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// Options for the preferred size at which to stretch our stretchy children
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#define STRETCH_CONSIDER_ACTUAL_SIZE 0x00000001 // just use our current size
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#define STRETCH_CONSIDER_EMBELLISHMENTS \
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0x00000002 // size calculations include embellishments
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class nsMathMLContainerFrame : public nsContainerFrame, public nsMathMLFrame {
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friend class nsMathMLmfencedFrame;
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public:
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nsMathMLContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
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ClassID aID)
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: nsContainerFrame(aStyle, aPresContext, aID),
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mIntrinsicWidth(NS_INTRINSIC_ISIZE_UNKNOWN),
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mBlockStartAscent(0) {}
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NS_DECL_QUERYFRAME_TARGET(nsMathMLContainerFrame)
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NS_DECL_QUERYFRAME
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NS_DECL_ABSTRACT_FRAME(nsMathMLContainerFrame)
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// --------------------------------------------------------------------------
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// Overloaded nsMathMLFrame methods -- see documentation in nsIMathMLFrame.h
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NS_IMETHOD
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Stretch(DrawTarget* aDrawTarget, nsStretchDirection aStretchDirection,
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nsBoundingMetrics& aContainerSize,
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ReflowOutput& aDesiredStretchSize) override;
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NS_IMETHOD
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UpdatePresentationDataFromChildAt(int32_t aFirstIndex, int32_t aLastIndex,
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uint32_t aFlagsValues,
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uint32_t aFlagsToUpdate) override {
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PropagatePresentationDataFromChildAt(this, aFirstIndex, aLastIndex,
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aFlagsValues, aFlagsToUpdate);
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return NS_OK;
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}
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// --------------------------------------------------------------------------
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// Overloaded nsContainerFrame methods -- see documentation in nsIFrame.h
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virtual bool IsFrameOfType(uint32_t aFlags) const override {
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if (aFlags & (eLineParticipant | eSupportsContainLayoutAndPaint)) {
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return false;
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}
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return nsContainerFrame::IsFrameOfType(aFlags & ~eMathML);
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}
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virtual void AppendFrames(ChildListID aListID,
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nsFrameList& aFrameList) override;
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virtual void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
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const nsLineList::iterator* aPrevFrameLine,
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nsFrameList& aFrameList) override;
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virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;
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/**
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* Both GetMinISize and GetPrefISize use the intrinsic width metrics
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* returned by GetIntrinsicMetrics, including ink overflow.
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*/
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virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
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virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
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/**
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* Return the intrinsic horizontal metrics of the frame's content area.
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*/
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virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
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ReflowOutput& aDesiredSize);
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virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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virtual void DidReflow(nsPresContext* aPresContext,
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const ReflowInput* aReflowInput) override
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{
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mPresentationData.flags &= ~NS_MATHML_STRETCH_DONE;
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return nsContainerFrame::DidReflow(aPresContext, aReflowInput);
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}
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;
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virtual void MarkIntrinsicISizesDirty() override;
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// Notification when an attribute is changed. The MathML module uses the
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// following paradigm:
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//
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// 1. If the MathML frame class doesn't have any cached automatic data that
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// depends on the attribute: we just reflow (e.g., this happens with
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// <msub>, <msup>, <mmultiscripts>, etc). This is the default behavior
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// implemented by this base class.
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//
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// 2. If the MathML frame class has cached automatic data that depends on
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// the attribute:
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// 2a. If the automatic data to update resides only within the descendants,
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// we just re-layout them using ReLayoutChildren(this);
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// (e.g., this happens with <ms>).
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// 2b. If the automatic data to update affects us in some way, we ask our
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// parent to re-layout its children using ReLayoutChildren(mParent);
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// Therefore, there is an overhead here in that our siblings are
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// re-laid too (e.g., this happens with <munder>, <mover>,
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// <munderover>).
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virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType) override;
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// helper function to apply mirroring to a horizontal coordinate, if needed.
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nscoord MirrorIfRTL(nscoord aParentWidth, nscoord aChildWidth,
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nscoord aChildLeading) {
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return StyleVisibility()->mDirection == mozilla::StyleDirection::Rtl
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? aParentWidth - aChildWidth - aChildLeading
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: aChildLeading;
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}
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// --------------------------------------------------------------------------
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// Additional methods
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protected:
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/* Place :
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* This method is used to measure or position child frames and other
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* elements. It may be called any number of times with aPlaceOrigin
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* false to measure, and the final call of the Reflow process before
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* returning from Reflow() or Stretch() will have aPlaceOrigin true
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* to position the elements.
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*
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* IMPORTANT: This method uses GetReflowAndBoundingMetricsFor() which must
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* have been set up with SaveReflowAndBoundingMetricsFor().
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*
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* The Place() method will use this information to compute the desired size
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* of the frame.
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*
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* @param aPlaceOrigin [in]
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* If aPlaceOrigin is false, compute your desired size using the
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* information from GetReflowAndBoundingMetricsFor. However, child
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* frames or other elements should not be repositioned.
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*
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* If aPlaceOrigin is true, reflow is finished. You should position
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* all your children, and return your desired size. You should now
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* use FinishReflowChild() on your children to complete post-reflow
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* operations.
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*
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* @param aDesiredSize [out] parameter where you should return your desired
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* size and your ascent/descent info. Compute your desired size using
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* the information from GetReflowAndBoundingMetricsFor, and include
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* any space you want for border/padding in the desired size you
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* return.
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*/
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virtual nsresult Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,
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ReflowOutput& aDesiredSize);
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// MeasureForWidth:
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//
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// A method used by nsMathMLContainerFrame::GetIntrinsicISize to get the
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// width that a particular Place method desires. For most frames, this will
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// just call the object's Place method. However <msqrt> and <menclose> use
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// nsMathMLContainerFrame::GetIntrinsicISize to measure the child frames as
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// if in an <mrow>, and so their frames implement MeasureForWidth to use
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// nsMathMLContainerFrame::Place.
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virtual nsresult MeasureForWidth(DrawTarget* aDrawTarget,
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ReflowOutput& aDesiredSize);
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// helper to re-sync the automatic data in our children and notify our parent
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// to reflow us when changes (e.g., append/insert/remove) happen in our child
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// list
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virtual nsresult ChildListChanged(int32_t aModType);
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// helper to get the preferred size that a container frame should use to fire
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// the stretch on its stretchy child frames.
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void GetPreferredStretchSize(DrawTarget* aDrawTarget, uint32_t aOptions,
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nsStretchDirection aStretchDirection,
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nsBoundingMetrics& aPreferredStretchSize);
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// helper used by mstyle, mphantom, mpadded and mrow in their implementation
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// of TransmitAutomaticData() to determine whether they are space-like.
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nsresult TransmitAutomaticDataForMrowLikeElement();
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public:
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// error handlers to provide a visual feedback to the user when an error
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// (typically invalid markup) was encountered during reflow.
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nsresult ReflowError(DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize);
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/*
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* Helper to call ReportErrorToConsole for parse errors involving
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* attribute/value pairs.
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* @param aAttribute The attribute for which the parse error occured.
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* @param aValue The value for which the parse error occured.
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*/
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nsresult ReportParseError(const char16_t* aAttribute, const char16_t* aValue);
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/*
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* Helper to call ReportErrorToConsole when certain tags
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* have more than the expected amount of children.
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*/
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nsresult ReportChildCountError();
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/*
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* Helper to call ReportErrorToConsole when certain tags have
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* invalid child tags
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* @param aChildTag The tag which is forbidden in this context
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*/
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nsresult ReportInvalidChildError(nsAtom* aChildTag);
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/*
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* Helper to call ReportToConsole when an error occurs.
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* @param aParams see nsContentUtils::ReportToConsole
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*/
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nsresult ReportErrorToConsole(
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const char* aErrorMsgId,
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const nsTArray<nsString>& aParams = nsTArray<nsString>());
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// helper method to reflow a child frame. We are inline frames, and we don't
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// know our positions until reflow is finished. That's why we ask the
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// base method not to worry about our position.
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void ReflowChild(nsIFrame* aKidFrame, nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus);
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protected:
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// helper to add the inter-spacing when <math> is the immediate parent.
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// Since we don't (yet) handle the root <math> element ourselves, we need to
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// take special care of the inter-frame spacing on elements for which <math>
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// is the direct xml parent. This function will be repeatedly called from
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// left to right on the childframes of <math>, and by so doing it will
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// emulate the spacing that would have been done by a <mrow> container.
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// e.g., it fixes <math> <mi>f</mi> <mo>q</mo> <mi>f</mi> <mo>I</mo> </math>
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virtual nscoord FixInterFrameSpacing(ReflowOutput& aDesiredSize);
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// helper method to complete the post-reflow hook and ensure that embellished
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// operators don't terminate their Reflow without receiving a Stretch command.
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virtual nsresult FinalizeReflow(DrawTarget* aDrawTarget,
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ReflowOutput& aDesiredSize);
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// Record metrics of a child frame for recovery through the following method
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static void SaveReflowAndBoundingMetricsFor(
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nsIFrame* aFrame, const ReflowOutput& aReflowOutput,
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const nsBoundingMetrics& aBoundingMetrics);
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// helper method to facilitate getting the reflow and bounding metrics of a
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// child frame. The argument aMathMLFrameType, when non null, will return
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// the 'type' of the frame, which is used to determine the inter-frame
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// spacing.
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// IMPORTANT: This function is only meant to be called in Place() methods as
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// the information is available only when set up with the above method
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// during Reflow/Stretch() and GetPrefISize().
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static void GetReflowAndBoundingMetricsFor(
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nsIFrame* aFrame, ReflowOutput& aReflowOutput,
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nsBoundingMetrics& aBoundingMetrics,
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eMathMLFrameType* aMathMLFrameType = nullptr);
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// helper method to clear metrics saved with
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// SaveReflowAndBoundingMetricsFor() from all child frames.
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void ClearSavedChildMetrics();
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// helper to let the update of presentation data pass through
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// a subtree that may contain non-MathML container frames
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static void PropagatePresentationDataFor(nsIFrame* aFrame,
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uint32_t aFlagsValues,
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uint32_t aFlagsToUpdate);
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public:
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static void PropagatePresentationDataFromChildAt(nsIFrame* aParentFrame,
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int32_t aFirstChildIndex,
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int32_t aLastChildIndex,
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uint32_t aFlagsValues,
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uint32_t aFlagsToUpdate);
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// Sets flags on aFrame and all descendant frames
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static void PropagateFrameFlagFor(nsIFrame* aFrame, nsFrameState aFlags);
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// helper to let the rebuild of automatic data (presentation data
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// and embellishement data) walk through a subtree that may contain
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// non-MathML container frames. Note that this method re-builds the
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// automatic data in the children -- not in aParentFrame itself (except
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// for those particular operations that the parent frame may do in its
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// TransmitAutomaticData()). The reason it works this way is because
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// a container frame knows what it wants for its children, whereas children
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// have no clue who their parent is. For example, it is <mfrac> who knows
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// that its children have to be in scriptsizes, and has to transmit this
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// information to them. Hence, when changes occur in a child frame, the child
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// has to request the re-build from its parent. Unfortunately, the extra cost
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// for this is that it will re-sync in the siblings of the child as well.
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static void RebuildAutomaticDataForChildren(nsIFrame* aParentFrame);
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// helper to blow away the automatic data cached in a frame's subtree and
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// re-layout its subtree to reflect changes that may have happen. In the
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// event where aParentFrame isn't a MathML frame, it will first walk up to
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// the ancestor that is a MathML frame, and re-layout from there -- this is
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// to guarantee that automatic data will be rebuilt properly. Note that this
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// method re-builds the automatic data in the children -- not in the parent
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// frame itself (except for those particular operations that the parent frame
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// may do do its TransmitAutomaticData()). @see
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// RebuildAutomaticDataForChildren
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//
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// aBits are the bits to pass to FrameNeedsReflow() when we call it.
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static nsresult ReLayoutChildren(nsIFrame* aParentFrame);
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protected:
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// Helper method which positions child frames as an <mrow> on given baseline
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// y = aBaseline starting from x = aOffsetX, calling FinishReflowChild()
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// on the frames.
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void PositionRowChildFrames(nscoord aOffsetX, nscoord aBaseline);
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// A variant on FinishAndStoreOverflow() that uses the union of child
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// overflows, the frame bounds, and mBoundingMetrics to set and store the
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// overflow.
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void GatherAndStoreOverflow(ReflowOutput* aMetrics);
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/**
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* Call DidReflow() if the NS_FRAME_IN_REFLOW frame bit is set on aFirst and
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* all its next siblings up to, but not including, aStop.
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* aStop == nullptr meaning all next siblings with the bit set.
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* The method does nothing if aFirst == nullptr.
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*/
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static void DidReflowChildren(nsIFrame* aFirst, nsIFrame* aStop = nullptr);
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/**
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* Recompute mIntrinsicWidth if it's not already up to date.
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*/
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void UpdateIntrinsicWidth(gfxContext* aRenderingContext);
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nscoord mIntrinsicWidth;
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nscoord mBlockStartAscent;
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private:
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class RowChildFrameIterator;
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friend class RowChildFrameIterator;
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};
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// --------------------------------------------------------------------------
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// Currently, to benefit from line-breaking inside the <math> element, <math> is
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// simply mapping to nsBlockFrame or nsInlineFrame.
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// A separate implemention needs to provide:
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// 1) line-breaking
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// 2) proper inter-frame spacing
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// 3) firing of Stretch() (in which case FinalizeReflow() would have to be
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// cleaned)
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// Issues: If/when mathml becomes a pluggable component, the separation will be
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// needed.
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class nsMathMLmathBlockFrame final : public nsBlockFrame {
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public:
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmathBlockFrame)
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friend nsContainerFrame* NS_NewMathMLmathBlockFrame(
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mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
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// beware, mFrames is not set by nsBlockFrame
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// cannot use mFrames{.FirstChild()|.etc} since the block code doesn't set
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// mFrames
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virtual void SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList) override {
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MOZ_ASSERT(aListID == kPrincipalList || aListID == kBackdropList,
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"unexpected frame list");
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nsBlockFrame::SetInitialChildList(aListID, aChildList);
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if (aListID == kPrincipalList) {
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// re-resolve our subtree to set any mathml-expected data
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nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
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}
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}
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virtual void AppendFrames(ChildListID aListID,
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nsFrameList& aFrameList) override {
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NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
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"unexpected frame list");
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nsBlockFrame::AppendFrames(aListID, aFrameList);
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if (MOZ_LIKELY(aListID == kPrincipalList))
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nsMathMLContainerFrame::ReLayoutChildren(this);
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}
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virtual void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
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const nsLineList::iterator* aPrevFrameLine,
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nsFrameList& aFrameList) override {
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NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
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"unexpected frame list");
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nsBlockFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine, aFrameList);
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if (MOZ_LIKELY(aListID == kPrincipalList))
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nsMathMLContainerFrame::ReLayoutChildren(this);
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}
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virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override {
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NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
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"unexpected frame list");
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nsBlockFrame::RemoveFrame(aListID, aOldFrame);
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if (MOZ_LIKELY(aListID == kPrincipalList))
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nsMathMLContainerFrame::ReLayoutChildren(this);
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}
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virtual bool IsFrameOfType(uint32_t aFlags) const override {
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return nsBlockFrame::IsFrameOfType(aFlags & ~nsIFrame::eMathML);
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}
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// See nsIMathMLFrame.h
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bool IsMrowLike() {
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return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
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}
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protected:
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explicit nsMathMLmathBlockFrame(ComputedStyle* aStyle,
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nsPresContext* aPresContext)
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: nsBlockFrame(aStyle, aPresContext, kClassID) {
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// We should always have a float manager. Not that things can really try
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// to float out of us anyway, but we need one for line layout.
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// Bug 1301881: Do we still need to set NS_BLOCK_FLOAT_MGR?
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// AddStateBits(NS_BLOCK_FLOAT_MGR);
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}
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virtual ~nsMathMLmathBlockFrame() {}
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};
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// --------------
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class nsMathMLmathInlineFrame final : public nsInlineFrame,
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public nsMathMLFrame {
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public:
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmathInlineFrame)
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friend nsContainerFrame* NS_NewMathMLmathInlineFrame(
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mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
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virtual void SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList) override {
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NS_ASSERTION(aListID == kPrincipalList, "unexpected frame list");
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|
nsInlineFrame::SetInitialChildList(aListID, aChildList);
|
|
// re-resolve our subtree to set any mathml-expected data
|
|
nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
|
|
}
|
|
|
|
virtual void AppendFrames(ChildListID aListID,
|
|
nsFrameList& aFrameList) override {
|
|
NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
|
|
"unexpected frame list");
|
|
nsInlineFrame::AppendFrames(aListID, aFrameList);
|
|
if (MOZ_LIKELY(aListID == kPrincipalList))
|
|
nsMathMLContainerFrame::ReLayoutChildren(this);
|
|
}
|
|
|
|
virtual void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
|
|
const nsLineList::iterator* aPrevFrameLine,
|
|
nsFrameList& aFrameList) override {
|
|
NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
|
|
"unexpected frame list");
|
|
nsInlineFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
|
|
aFrameList);
|
|
if (MOZ_LIKELY(aListID == kPrincipalList))
|
|
nsMathMLContainerFrame::ReLayoutChildren(this);
|
|
}
|
|
|
|
virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override {
|
|
NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList,
|
|
"unexpected frame list");
|
|
nsInlineFrame::RemoveFrame(aListID, aOldFrame);
|
|
if (MOZ_LIKELY(aListID == kPrincipalList))
|
|
nsMathMLContainerFrame::ReLayoutChildren(this);
|
|
}
|
|
|
|
virtual bool IsFrameOfType(uint32_t aFlags) const override {
|
|
return nsInlineFrame::IsFrameOfType(aFlags & ~nsIFrame::eMathML);
|
|
}
|
|
|
|
bool IsMrowLike() override {
|
|
return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
|
|
}
|
|
|
|
protected:
|
|
explicit nsMathMLmathInlineFrame(ComputedStyle* aStyle,
|
|
nsPresContext* aPresContext)
|
|
: nsInlineFrame(aStyle, aPresContext, kClassID) {}
|
|
|
|
virtual ~nsMathMLmathInlineFrame() {}
|
|
};
|
|
|
|
#endif /* nsMathMLContainerFrame_h___ */
|