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b099eab802
All classes deriving from nsIFrame that did not have any subclasses themselves (at the time of writing this patch) have been marked with `final`. Some other Layout classes have also been made final, but this was opportunistic while working on nsIFrame subclasses, and is definitely not exhaustive, further patches welcome; refer to bug 1332680. Advantages of marking a class final include: - Allowing the compiler to devirtualize some method calls (i.e., calling virtual functions directly instead of going through the vtable), - Indicating that the class is not currently subclassed, - Preventing subclassing without being aware that this would remove the finalization benefits of the parent class. `final` does not signify that these classes should *never* be subclassed, this is left for developers to decide. Differential Revision: https://phabricator.services.mozilla.com/D5020 --HG-- extra : moz-landing-system : lando
110 lines
3.3 KiB
C++
110 lines
3.3 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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//
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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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{
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmoFrame)
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friend nsIFrame* NS_NewMathMLmoFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle);
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virtual eMathMLFrameType GetMathMLFrameType() override;
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virtual void
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SetAdditionalComputedStyle(int32_t aIndex,
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ComputedStyle* aComputedStyle) override;
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virtual ComputedStyle*
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GetAdditionalComputedStyle(int32_t aIndex) const override;
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virtual 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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virtual void
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SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList) override;
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virtual void
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Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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virtual nsresult
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Place(DrawTarget* aDrawTarget,
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bool aPlaceOrigin,
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ReflowOutput& aDesiredSize) override;
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virtual void MarkIntrinsicISizesDirty() override;
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virtual void
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GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
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ReflowOutput& aDesiredSize) override;
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virtual nsresult
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AttributeChanged(int32_t aNameSpaceID,
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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,
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nsStretchDirection aStretchDirection,
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nsBoundingMetrics& aContainerSize,
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ReflowOutput& aDesiredStretchSize) override;
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virtual nsresult
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ChildListChanged(int32_t aModType) override
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{
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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) :
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nsMathMLTokenFrame(aStyle, kClassID), mFlags(0), mMinSize(0), mMaxSize(0) {}
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virtual ~nsMathMLmoFrame();
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nsMathMLChar 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
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ProcessOperatorData();
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// helper to double check thar our char should be rendered as a selected char
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bool
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IsFrameInSelection(nsIFrame* aFrame);
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};
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#endif /* nsMathMLmoFrame_h___ */
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