152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
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/* @doc INTERNAL
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*
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* @module _DFREEZE.H Classes handle freezing the display |
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*
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* This module declares class used by logic to handle freezing the display
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*
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* History: <nl>
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* 2/8/96 ricksa Created
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*
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* Copyright (c) 1995-1997, Microsoft Corporation. All rights reserved.
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*/
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#ifndef _DFREEZE_H
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#define _DFREEZE_H
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/*
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* CAccumDisplayChanges
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*
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* @class This class is used to accumulate of all update to the display so
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* so that at a later time the display can ask to be updated to
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* reflect all the previous updates.
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*/
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class CAccumDisplayChanges
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{
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//@access Public Methods
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public:
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CAccumDisplayChanges(); //@cmember Constructor
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~CAccumDisplayChanges(); //@cmember Destructor
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void AddRef(); //@cmember Add a reference
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LONG Release(); //@cmember Release a reference
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void UpdateRecalcRegion( //@cmember Update the region
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LONG cp, // for recalc
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LONG cchDel,
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LONG cchNew);
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void GetUpdateRegion( //@cmember Get the update
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LONG *pcpStart, // region
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LONG *pcchNew,
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LONG *pcchDel,
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BOOL *pfUpdateCaret = NULL,
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BOOL *pfScrollIntoView = NULL,
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BOOL *pfRedisplayOnThaw = NULL);
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void SaveUpdateCaret( //@cmember Save update
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BOOL fScrollIntoView); // caret state
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void SetNeedRedisplayOnThaw(BOOL fNeedRedisplay)
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{
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_fNeedRedisplay = fNeedRedisplay;
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}
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//@access Private Data
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private:
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LONG _cRefs; //@cmember Reference count
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LONG _cpMin; //@cmember Min cp of change w.r.t.
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// original text array
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LONG _cpMax; //@cmember Max cp of change w.r.t.
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// original text array
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LONG _delta; //@cmember net # of chars changed
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BOOL _fUpdateCaret:1; //@cmember Whether update
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// caret required
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BOOL _fScrollIntoView:1; //@cmember first parm to
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BOOL _fNeedRedisplay:1; //@cmember redisplay entire control on thaw
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};
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/*
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* CAccumDisplayChanges::CAccumDisplayChanges()
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*
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* @mfunc
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* Initialize object for accumulating display changes
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*/
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inline CAccumDisplayChanges::CAccumDisplayChanges()
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: _cRefs(1), _cpMin(CP_INFINITE), _fUpdateCaret(FALSE)
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{
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// Header does all the work
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}
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/*
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* CAccumDisplayChanges::~CAccumDisplayChanges()
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*
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* @mfunc
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* Free object
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*
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* @devnote:
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* This only serves a purpose in debug mode
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*
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*/
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inline CAccumDisplayChanges::~CAccumDisplayChanges()
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{
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// Nothing to clean up
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}
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/*
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* CAccumDisplayChanges::~CAccumDisplayChanges()
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*
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* @mfunc
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* Add another reference to this object
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*/
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inline void CAccumDisplayChanges::AddRef()
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{
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++_cRefs;
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}
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/*
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* CAccumDisplayChanges::Release()
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*
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* @mfunc
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* Release a reference to this object
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*
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* @rdesc
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* 0 - no more references
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* ~0 - there are still outstanding references
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*
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* @devnote:
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* If 0 is returned the information should be retrieved from
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* this object and passed on to the display so that it can
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* update itself.
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*
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*/
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inline LONG CAccumDisplayChanges::Release()
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{
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// When the reference count is 0, it is time to update the display.
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return --_cRefs;
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}
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/*
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* CAccumDisplayChanges::SaveUpdateCaret()
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*
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* @mfunc
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* Save parameters for update caret
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*/
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inline void CAccumDisplayChanges::SaveUpdateCaret(
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BOOL fScrollIntoView) //@parm First parm for UpdateCaret
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{
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_fUpdateCaret = TRUE;
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if (!_fScrollIntoView)
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_fScrollIntoView = fScrollIntoView;
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}
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#endif // _DFREEZE_H
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