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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
58 lines
1.6 KiB
C++
58 lines
1.6 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 nsMathMLmspaceFrame_h___
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#define nsMathMLmspaceFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsMathMLContainerFrame.h"
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//
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// <mspace> -- space
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//
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class nsMathMLmspaceFrame final : public nsMathMLContainerFrame
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{
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
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friend nsIFrame* NS_NewMathMLmspaceFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle);
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NS_IMETHOD
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TransmitAutomaticData() override {
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// The REC defines the following elements to be space-like:
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// * an mtext, mspace, maligngroup, or malignmark element;
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mPresentationData.flags |= NS_MATHML_SPACE_LIKE;
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return NS_OK;
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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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protected:
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explicit nsMathMLmspaceFrame(ComputedStyle* aStyle) :
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nsMathMLContainerFrame(aStyle, kClassID), mWidth(0), mHeight(0), mDepth(0) {}
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virtual ~nsMathMLmspaceFrame();
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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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nscoord mWidth;
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nscoord mHeight;
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nscoord mDepth;
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// helper method to initialize our member data
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void
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ProcessAttributes(nsPresContext* aPresContext);
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};
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#endif /* nsMathMLmspaceFrame_h___ */
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