mirror of
https://github.com/HeyPuter/firefox.git
synced 2026-11-13 20:14:57 -10:00
Frédéric Wang
8a08b8f2c0
MathML classes has a few Place*() methods used for layout and intrinsic size calculation. These methods have a parameter "aPlaceOrigin" indicating whether the children and other painted objects should have their final positions set, or if the method is only called for measuring. This parameter is typically set to false when doing intrinsic size calculation or when performing some non-final measurement for operator stretching. For intrinsic size calculation, it is generally enough to perform placement with aPlaceOrigin=false and ignoring the vertical metrics. Some Place*() methods also have a parameter "aWidthOnly" for special handling. For example, msqrt stretches a radical symbol vertically to match the height of the content but when doing intrinsic size calculation this is approximated to nsMathMLChar::GetMaxWidth() instead. When we implement border/padding/margin we should also be able to choose between using IntrinsicISizeOffsets() or GetUsed*() methods. Finally, some Place*() methods initially call a place routing of a parent class before further tweaking the layout. For example, msqrt uses mrow layout on children and adds some radical symbol on top of them. When we implement border/padding, we should make sure we don't add the border/padding before the final result. In order to handle all these placement behaviors, a new EnumSet is introduced. This commit does not change behavior. Handling of padding, border and margin will be handled in follow-up patches. Differential Revision: https://phabricator.services.mozilla.com/D216669
101 lines
3.2 KiB
C++
101 lines
3.2 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 nsMathMLmoFrame_h___
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#define nsMathMLmoFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsMathMLTokenFrame.h"
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#include "nsMathMLChar.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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// <mo> -- operator, fence, or separator
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//
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class nsMathMLmoFrame final : public nsMathMLTokenFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmoFrame)
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friend nsIFrame* NS_NewMathMLmoFrame(mozilla::PresShell* aPresShell,
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ComputedStyle* aStyle);
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eMathMLFrameType GetMathMLFrameType() override;
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void DidSetComputedStyle(ComputedStyle* aOldStyle) override;
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void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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NS_IMETHOD
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InheritAutomaticData(nsIFrame* aParent) override;
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NS_IMETHOD
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TransmitAutomaticData() override;
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void SetInitialChildList(ChildListID aListID,
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nsFrameList&& aChildList) override;
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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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nsresult Place(DrawTarget* aDrawTarget, const PlaceFlags& aFlags,
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ReflowOutput& aDesiredSize) override;
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virtual void MarkIntrinsicISizesDirty() override;
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virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
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ReflowOutput& aDesiredSize) override;
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virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType) override;
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// This method is called by the parent frame to ask <mo>
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// to stretch itself.
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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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virtual nsresult ChildListChanged(int32_t aModType) override {
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ProcessTextData();
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return nsMathMLContainerFrame::ChildListChanged(aModType);
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}
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protected:
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explicit nsMathMLmoFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
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: nsMathMLTokenFrame(aStyle, aPresContext, kClassID),
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mFlags(0),
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mMinSize(0),
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mMaxSize(0) {}
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virtual ~nsMathMLmoFrame();
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nsMathMLChar
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mMathMLChar; // Here is the MathMLChar that will deal with the operator.
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nsOperatorFlags mFlags;
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float mMinSize;
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float mMaxSize;
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bool UseMathMLChar();
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// overload the base method so that we can setup our nsMathMLChar
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void ProcessTextData();
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// helper to get our 'form' and lookup in the Operator Dictionary to fetch
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// our default data that may come from there, and to complete the setup
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// using attributes that we may have
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void ProcessOperatorData();
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// helper to double check thar our char should be rendered as a selected char
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bool IsFrameInSelection(nsIFrame* aFrame);
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};
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#endif /* nsMathMLmoFrame_h___ */
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