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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
71 lines
2.0 KiB
C++
71 lines
2.0 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 nsMathMLmsqrtFrame_h___
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#define nsMathMLmsqrtFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsMathMLmencloseFrame.h"
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//
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// <msqrt> -- form a radical
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//
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/*
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The MathML REC describes:
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The <msqrt> element is used to display square roots.
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The syntax for <msqrt> is:
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<msqrt> base </msqrt>
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Attributes of <msqrt> and <mroot>:
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None (except the attributes allowed for all MathML elements, listed in Section
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2.3.4).
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The <mroot> element increments scriptlevel by 2, and sets displaystyle to
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"false", within index, but leaves both attributes unchanged within base. The
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<msqrt> element leaves both attributes unchanged within all its arguments.
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These attributes are inherited by every element from its rendering environment,
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but can be set explicitly only on <mstyle>. (See Section 3.3.4.)
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*/
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class nsMathMLmsqrtFrame final : public nsMathMLmencloseFrame
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{
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmsqrtFrame)
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friend nsIFrame* NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell,
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ComputedStyle* aStyle);
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virtual void
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Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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NS_IMETHOD
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InheritAutomaticData(nsIFrame* aParent) 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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virtual bool
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IsMrowLike() override
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{
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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 nsMathMLmsqrtFrame(ComputedStyle* aStyle);
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virtual ~nsMathMLmsqrtFrame();
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};
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#endif /* nsMathMLmsqrtFrame_h___ */
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