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26a6db6fb1
This patch changes the signature to `GetMinISize()`, `GetPrefISize()`, `IntrinsicISize` by adding a helper struct as a preparation. Then we can just add more data such as a percentage basis to the struct without altering the signature in the future. When passing `IntrinsicSizeInput` struct down to another helper method, we generally just pass the original one if the method is computing the intrinsic size of our own or our anonymous children. If the method is computing our children's intrinsic contribution, we'll need to create a brand new `IntrinsicSizeInput` for our children. Differential Revision: https://phabricator.services.mozilla.com/D219521
524 lines
23 KiB
C++
524 lines
23 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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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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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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void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
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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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void RemoveFrame(DestroyContext&, ChildListID aListID,
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nsIFrame* aOldFrame) override;
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nscoord IntrinsicISize(const mozilla::IntrinsicSizeInput& aInput,
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mozilla::IntrinsicISizeType aType) 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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void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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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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void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) override;
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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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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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enum class PlaceFlag : uint8_t {
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// If MeasureOnly is set, compute your desired size using the information
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// from GetReflowAndBoundingMetricsFor. However, child frames or other
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// elements should not be repositioned.
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// If MeasureOnly is not set, reflow is finished. You should position all
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// your children, and return your desired size. You should now use
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// FinishReflowChild() on your children to complete post-reflow operations.
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MeasureOnly,
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// If IntrinsicSize is set, the function is actually used to determine
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// intrinsic size (and consequently MeasureOnly is expected to be set too).
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// - It will use nsMathMLChar::GetMaxWidth instead of nsMathMLChar::Stretch.
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// - It will use IntrinsicISizeOffsets() for padding/border/margin instead
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// of GetUsedBorder/Padding/Margin().
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// - etc
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IntrinsicSize,
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// If IgnoreBorderPadding is set, the function will complete without
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// adding the border/padding around the math layout. This can be used for
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// elements like <msqrt> that first layout their children as an <mrow>,
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// place some radical symbol on top of them and finally add its
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// padding/border around that radical symbol.
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IgnoreBorderPadding,
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};
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using PlaceFlags = mozilla::EnumSet<PlaceFlag>;
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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 MeasureOnly
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* true, and the final call of the Reflow process before
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* returning from Reflow() or Stretch() will have MeasureOnly false
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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 aFlags [in] Flags to indicate the way the Place method should
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* behave. See document for PlaceFlag above.
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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, const PlaceFlags& aFlags,
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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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/*
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* Helper to render the frame as a default mrow-like container when an error
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* (typically invalid markup) was encountered during reflow. Parameters are
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* the same as Place().
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*/
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nsresult PlaceAsMrow(DrawTarget* aDrawTarget, const PlaceFlags& aFlags,
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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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nsMargin GetBorderPaddingForPlace(const PlaceFlags& aFlags);
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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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static nsMargin GetMarginForPlace(const PlaceFlags& aFlags, nsIFrame* aChild);
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static void InflateReflowAndBoundingMetrics(
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const nsMargin& aBorderPadding, ReflowOutput& aReflowOutput,
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nsBoundingMetrics& aBoundingMetrics);
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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 mIntrinsicISize if it's not already up to date.
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*/
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void UpdateIntrinsicISize(gfxContext* aRenderingContext);
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nscoord mIntrinsicISize = NS_INTRINSIC_ISIZE_UNKNOWN;
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nscoord mBlockStartAscent = 0;
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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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void SetInitialChildList(ChildListID aListID,
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nsFrameList&& aChildList) override {
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MOZ_ASSERT(aListID == mozilla::FrameChildListID::Principal ||
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aListID == mozilla::FrameChildListID::Backdrop,
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"unexpected frame list");
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nsBlockFrame::SetInitialChildList(aListID, std::move(aChildList));
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if (aListID == mozilla::FrameChildListID::Principal) {
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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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void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override {
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NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
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aListID == mozilla::FrameChildListID::NoReflowPrincipal,
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"unexpected frame list");
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nsBlockFrame::AppendFrames(aListID, std::move(aFrameList));
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if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) {
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nsMathMLContainerFrame::ReLayoutChildren(this);
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}
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}
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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 == mozilla::FrameChildListID::Principal ||
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aListID == mozilla::FrameChildListID::NoReflowPrincipal,
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"unexpected frame list");
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nsBlockFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
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std::move(aFrameList));
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if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) {
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nsMathMLContainerFrame::ReLayoutChildren(this);
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}
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}
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void RemoveFrame(DestroyContext& aContext, ChildListID aListID,
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nsIFrame* aOldFrame) override {
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NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
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aListID == mozilla::FrameChildListID::NoReflowPrincipal,
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"unexpected frame list");
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nsBlockFrame::RemoveFrame(aContext, aListID, aOldFrame);
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if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) {
|
|
nsMathMLContainerFrame::ReLayoutChildren(this);
|
|
}
|
|
}
|
|
|
|
// See nsIMathMLFrame.h
|
|
bool IsMrowLike() {
|
|
return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
|
|
}
|
|
|
|
protected:
|
|
explicit nsMathMLmathBlockFrame(ComputedStyle* aStyle,
|
|
nsPresContext* aPresContext)
|
|
: nsBlockFrame(aStyle, aPresContext, kClassID) {}
|
|
virtual ~nsMathMLmathBlockFrame() = default;
|
|
};
|
|
|
|
// --------------
|
|
|
|
class nsMathMLmathInlineFrame final : public nsInlineFrame,
|
|
public nsMathMLFrame {
|
|
public:
|
|
NS_DECL_QUERYFRAME
|
|
NS_DECL_FRAMEARENA_HELPERS(nsMathMLmathInlineFrame)
|
|
|
|
friend nsContainerFrame* NS_NewMathMLmathInlineFrame(
|
|
mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
|
|
|
|
void SetInitialChildList(ChildListID aListID,
|
|
nsFrameList&& aChildList) override {
|
|
NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal,
|
|
"unexpected frame list");
|
|
nsInlineFrame::SetInitialChildList(aListID, std::move(aChildList));
|
|
// re-resolve our subtree to set any mathml-expected data
|
|
nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
|
|
}
|
|
|
|
void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override {
|
|
NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
|
|
aListID == mozilla::FrameChildListID::NoReflowPrincipal,
|
|
"unexpected frame list");
|
|
nsInlineFrame::AppendFrames(aListID, std::move(aFrameList));
|
|
if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) {
|
|
nsMathMLContainerFrame::ReLayoutChildren(this);
|
|
}
|
|
}
|
|
|
|
void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
|
|
const nsLineList::iterator* aPrevFrameLine,
|
|
nsFrameList&& aFrameList) override {
|
|
NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
|
|
aListID == mozilla::FrameChildListID::NoReflowPrincipal,
|
|
"unexpected frame list");
|
|
nsInlineFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
|
|
std::move(aFrameList));
|
|
if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) {
|
|
nsMathMLContainerFrame::ReLayoutChildren(this);
|
|
}
|
|
}
|
|
|
|
void RemoveFrame(DestroyContext& aContext, ChildListID aListID,
|
|
nsIFrame* aOldFrame) override {
|
|
NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
|
|
aListID == mozilla::FrameChildListID::NoReflowPrincipal,
|
|
"unexpected frame list");
|
|
nsInlineFrame::RemoveFrame(aContext, aListID, aOldFrame);
|
|
if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) {
|
|
nsMathMLContainerFrame::ReLayoutChildren(this);
|
|
}
|
|
}
|
|
|
|
bool IsMrowLike() override {
|
|
return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
|
|
}
|
|
|
|
protected:
|
|
explicit nsMathMLmathInlineFrame(ComputedStyle* aStyle,
|
|
nsPresContext* aPresContext)
|
|
: nsInlineFrame(aStyle, aPresContext, kClassID) {}
|
|
|
|
virtual ~nsMathMLmathInlineFrame() = default;
|
|
};
|
|
|
|
#endif /* nsMathMLContainerFrame_h___ */
|