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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef nsMathMLmunderoverFrame_h___
       7             : #define nsMathMLmunderoverFrame_h___
       8             : 
       9             : #include "mozilla/Attributes.h"
      10             : #include "nsIReflowCallback.h"
      11             : #include "nsMathMLContainerFrame.h"
      12             : 
      13             : //
      14             : // <munderover> -- attach an underscript-overscript pair to a base
      15             : //
      16             : 
      17             : class nsMathMLmunderoverFrame final
      18             :   : public nsMathMLContainerFrame
      19             :   , public nsIReflowCallback
      20             : {
      21             : 
      22             : public:
      23           0 :   NS_DECL_FRAMEARENA_HELPERS(nsMathMLmunderoverFrame)
      24             : 
      25             :   friend nsIFrame* NS_NewMathMLmunderoverFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
      26             : 
      27             :   nsresult Place(DrawTarget* aDrawTarget,
      28             :                  bool aPlaceOrigin,
      29             :                  ReflowOutput& aDesiredSize) override;
      30             : 
      31             :   NS_IMETHOD InheritAutomaticData(nsIFrame* aParent) override;
      32             : 
      33             :   NS_IMETHOD TransmitAutomaticData() override;
      34             : 
      35             :   NS_IMETHOD UpdatePresentationData(uint32_t aFlagsValues,
      36             :                                     uint32_t aFlagsToUpdate) override;
      37             : 
      38             :   void DestroyFrom(nsIFrame* aRoot) override;
      39             : 
      40             :   nsresult AttributeChanged(int32_t aNameSpaceID,
      41             :                             nsIAtom* aAttribute,
      42             :                             int32_t aModType) override;
      43             : 
      44             :   uint8_t ScriptIncrement(nsIFrame* aFrame) override;
      45             : 
      46             :   // nsIReflowCallback.
      47             :   bool ReflowFinished() override;
      48             :   void ReflowCallbackCanceled() override;
      49             : 
      50             : protected:
      51           0 :   explicit nsMathMLmunderoverFrame(nsStyleContext* aContext)
      52           0 :     : nsMathMLContainerFrame(aContext, kClassID)
      53             :     , mIncrementUnder(false)
      54           0 :     , mIncrementOver(false)
      55           0 :   {}
      56             : 
      57             :   virtual ~nsMathMLmunderoverFrame();
      58             : 
      59             : private:
      60             :   // Helper to set the "increment script level" flag on the element belonging
      61             :   // to a child frame given by aChildIndex.
      62             :   //
      63             :   // When this flag is set, the style system will increment the scriptlevel for
      64             :   // the child element. This is needed for situations where the style system
      65             :   // cannot itself determine the scriptlevel (mfrac, munder, mover, munderover).
      66             :   //
      67             :   // This should be called during reflow.
      68             :   //
      69             :   // We set the flag and if it changed, we request appropriate restyling and
      70             :   // also queue a post-reflow callback to ensure that restyle and reflow happens
      71             :   // immediately after the current reflow.
      72             :   void SetIncrementScriptLevel(uint32_t aChildIndex, bool aIncrement);
      73             :   void SetPendingPostReflowIncrementScriptLevel();
      74             : 
      75             :   bool mIncrementUnder;
      76             :   bool mIncrementOver;
      77             : 
      78             :   struct SetIncrementScriptLevelCommand
      79             :   {
      80             :     uint32_t mChildIndex;
      81             :     bool mDoIncrement;
      82             :   };
      83             : 
      84             :   nsTArray<SetIncrementScriptLevelCommand>
      85             :     mPostReflowIncrementScriptLevelCommands;
      86             : };
      87             : 
      88             : 
      89             : #endif /* nsMathMLmunderoverFrame_h___ */