зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
2.8 KiB
C++
91 строка
2.8 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 nsMathMLmunderoverFrame_h___
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#define nsMathMLmunderoverFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsIReflowCallback.h"
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#include "nsMathMLContainerFrame.h"
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//
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// <munderover> -- attach an underscript-overscript pair to a base
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//
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class nsMathMLmunderoverFrame final
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: public nsMathMLContainerFrame
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, public nsIReflowCallback
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{
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsMathMLmunderoverFrame)
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friend nsIFrame* NS_NewMathMLmunderoverFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle);
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nsresult Place(DrawTarget* aDrawTarget,
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bool aPlaceOrigin,
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ReflowOutput& aDesiredSize) override;
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NS_IMETHOD InheritAutomaticData(nsIFrame* aParent) override;
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NS_IMETHOD TransmitAutomaticData() override;
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NS_IMETHOD UpdatePresentationData(uint32_t aFlagsValues,
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uint32_t aFlagsToUpdate) override;
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void DestroyFrom(nsIFrame* aRoot, PostDestroyData& aPostDestroyData) override;
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nsresult AttributeChanged(int32_t aNameSpaceID,
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nsAtom* aAttribute,
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int32_t aModType) override;
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uint8_t ScriptIncrement(nsIFrame* aFrame) override;
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// nsIReflowCallback.
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bool ReflowFinished() override;
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void ReflowCallbackCanceled() override;
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protected:
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explicit nsMathMLmunderoverFrame(ComputedStyle* aStyle)
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: nsMathMLContainerFrame(aStyle, kClassID)
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, mIncrementUnder(false)
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, mIncrementOver(false)
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{}
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virtual ~nsMathMLmunderoverFrame();
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private:
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// Helper to set the "increment script level" flag on the element belonging
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// to a child frame given by aChildIndex.
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//
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// When this flag is set, the style system will increment the scriptlevel for
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// the child element. This is needed for situations where the style system
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// cannot itself determine the scriptlevel (mfrac, munder, mover, munderover).
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//
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// This should be called during reflow.
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//
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// We set the flag and if it changed, we request appropriate restyling and
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// also queue a post-reflow callback to ensure that restyle and reflow happens
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// immediately after the current reflow.
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void SetIncrementScriptLevel(uint32_t aChildIndex, bool aIncrement);
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void SetPendingPostReflowIncrementScriptLevel();
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bool mIncrementUnder;
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bool mIncrementOver;
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struct SetIncrementScriptLevelCommand
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{
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uint32_t mChildIndex;
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bool mDoIncrement;
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};
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nsTArray<SetIncrementScriptLevelCommand>
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mPostReflowIncrementScriptLevelCommands;
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};
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#endif /* nsMathMLmunderoverFrame_h___ */
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