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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
109 lines
2.9 KiB
C++
109 lines
2.9 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 nsMathMLmpaddedFrame_h___
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#define nsMathMLmpaddedFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsMathMLContainerFrame.h"
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//
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// <mpadded> -- adjust space around content
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//
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class nsMathMLmpaddedFrame final : public nsMathMLContainerFrame
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{
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmpaddedFrame)
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friend nsIFrame* NS_NewMathMLmpaddedFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle);
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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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return TransmitAutomaticDataForMrowLikeElement();
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}
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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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bool
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IsMrowLike() override {
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return mFrames.FirstChild() != mFrames.LastChild() ||
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!mFrames.FirstChild();
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}
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protected:
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explicit nsMathMLmpaddedFrame(ComputedStyle* aStyle)
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: nsMathMLContainerFrame(aStyle, kClassID)
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, mWidthSign(0)
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, mHeightSign(0)
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, mDepthSign(0)
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, mLeadingSpaceSign(0)
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, mVerticalOffsetSign(0)
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, mWidthPseudoUnit(0)
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, mHeightPseudoUnit(0)
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, mDepthPseudoUnit(0)
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, mLeadingSpacePseudoUnit(0)
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, mVerticalOffsetPseudoUnit(0)
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{}
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virtual ~nsMathMLmpaddedFrame();
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virtual nsresult
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MeasureForWidth(DrawTarget* aDrawTarget,
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ReflowOutput& aDesiredSize) override;
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private:
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nsCSSValue mWidth;
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nsCSSValue mHeight;
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nsCSSValue mDepth;
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nsCSSValue mLeadingSpace;
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nsCSSValue mVerticalOffset;
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int32_t mWidthSign;
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int32_t mHeightSign;
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int32_t mDepthSign;
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int32_t mLeadingSpaceSign;
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int32_t mVerticalOffsetSign;
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int32_t mWidthPseudoUnit;
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int32_t mHeightPseudoUnit;
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int32_t mDepthPseudoUnit;
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int32_t mLeadingSpacePseudoUnit;
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int32_t mVerticalOffsetPseudoUnit;
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// helpers to process the attributes
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void
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ProcessAttributes();
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static bool
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ParseAttribute(nsString& aString,
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int32_t& aSign,
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nsCSSValue& aCSSValue,
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int32_t& aPseudoUnit);
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void
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UpdateValue(int32_t aSign,
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int32_t aPseudoUnit,
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const nsCSSValue& aCSSValue,
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const ReflowOutput& aDesiredSize,
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nscoord& aValueToUpdate,
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float aFontSizeInflation) const;
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};
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#endif /* nsMathMLmpaddedFrame_h___ */
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