375 lines
11 KiB
C
375 lines
11 KiB
C
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/*
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* _M_UNDO.H
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*
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* Purpose:
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* declares multi-level undo interfaces and classes
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*
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* Author:
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* alexgo 3/25/95
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*
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* Copyright (c) 1995-1998, Microsoft Corporation. All rights reserved.
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*/
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#ifndef __M_UNDO_H__
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#define __M_UNDO_H__
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#include "_callmgr.h"
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// Forward declaration to get around dependency cycle
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class CTxtEdit;
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class IUndoBuilder;
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/*
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* MergeDataTypes
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*
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* @enum Tags indicating the different data types that can be
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* sent in IAntiEvent::MergeData
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*/
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enum MergeDataTypes
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{
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MD_SIMPLE_REPLACERANGE = 1, //@emem a simple replace range;
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//usually just typing or backspace
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MD_SELECTIONRANGE = 2 //@emem the selection location
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};
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/*
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* SimpleReplaceRange
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*
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* @stuct SimpleReplaceRange | has the data from a replace range operation
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* *except* for any deleted characters. If we don't have to save
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* the deleted characters, we don't.
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*/
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struct SimpleReplaceRange
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{
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LONG cpMin; //@field cpMin of new text
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LONG cpMax; //@field cpMax of new text
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LONG cchDel; //@field number of characters deleted
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};
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/*
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* SELAEFLAGS
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*
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* @enum Flags to control how the selection range info should be treated
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*/
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enum SELAE
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{
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SELAE_MERGE = 1,
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SELAE_FORCEREPLACE = 2
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};
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/*
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* SelRange
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*
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* @struct SelRange | has the data for a selection's location _and_ the
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* information needed to generate an undo action for the selection
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* placement
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*
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* @comm -1 may be used to NO-OP any field
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*/
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struct SelRange
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{
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LONG cp; //@field Active end
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LONG cch; //@field Signed extension
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LONG cpNext; //@field cp for the inverse of this action
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LONG cchNext; //@field Extension for the inverse of this action
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SELAE flags; //@field Controls how this info is interpreted
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};
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/*
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* IAntiEvent
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*
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* Purpose:
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* AntiEvents undo 'normal' events, like typing a character
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*/
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class IAntiEvent
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{
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public:
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virtual void Destroy( void ) = 0;
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// It should be noted that CTxtEdit * here is really just a general
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// closure, i.e. it could be expressed by void *. However, since
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// this interface is currently just used internally, I've opted
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// to use the extra type-checking. alexgo
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virtual HRESULT Undo( CTxtEdit *ped, IUndoBuilder *publdr ) = 0;
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// This method will let us merge in arbitrary data for things like
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// group typing
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virtual HRESULT MergeData( DWORD dwDataType, void *pdata) = 0;
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// This method is called when anti-event is committed to undo stack.
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// Allows us to handle re-entrancy better for OLE objects.
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virtual void OnCommit(CTxtEdit *ped) = 0;
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// These two methods allow AntiEvents to be chained together in
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// a linked list
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virtual void SetNext( IAntiEvent *pNext ) = 0;
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virtual IAntiEvent *GetNext( void ) = 0;
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protected:
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~IAntiEvent() {;}
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};
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/*
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* IUndoMgr
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*
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* Purpose:
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* interface for managing "stacks" of anti-events
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*/
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class IUndoMgr
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{
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public:
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virtual void Destroy( void ) = 0;
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virtual DWORD SetUndoLimit( DWORD dwLim ) = 0;
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virtual DWORD GetUndoLimit( ) = 0;
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virtual HRESULT PushAntiEvent( UNDONAMEID idName, IAntiEvent *pae ) = 0;
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virtual HRESULT PopAndExecuteAntiEvent( void* pAE) = 0;
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virtual UNDONAMEID GetNameIDFromAE( void *pAE) = 0;
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virtual IAntiEvent *GetMergeAntiEvent( void ) = 0;
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virtual void* GetTopAECookie( void ) = 0;
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virtual void ClearAll() = 0;
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virtual BOOL CanUndo() = 0;
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virtual void StartGroupTyping() = 0;
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virtual void StopGroupTyping() = 0;
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protected:
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~IUndoMgr() {;}
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};
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/*
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* USFlags
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*
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* @enum
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* flags affecting the behaviour of Undo stacks
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*/
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enum USFlags
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{
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US_UNDO = 1, //@emem regular undo stack
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US_REDO = 2 //@emem Undo stack is for REDO functionality
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};
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/*
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* CUndoStack
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*
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* @class
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* manages a stack of anti-events. These anti-events are kept in
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* a resizable ring buffer. exports the IUndoMgr interface
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*/
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class CUndoStack : public IUndoMgr
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{
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//@access Public Methods
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public:
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virtual void Destroy( void ); //@cmember Destroy
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virtual DWORD SetUndoLimit( DWORD dwLim ); //@cmember Set item limit
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virtual DWORD GetUndoLimit();
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virtual HRESULT PushAntiEvent(UNDONAMEID idName, IAntiEvent *pae); //@cmember
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// add an AE to the stack
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virtual HRESULT PopAndExecuteAntiEvent( void *pAE); //@cmember
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// execute the most recent anti
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// event or up to dwDoToCookie
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virtual UNDONAMEID GetNameIDFromAE( void *pAE);//@cmember Get
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//name of the given AE
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virtual IAntiEvent *GetMergeAntiEvent( void ); //@cmember get the most
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//recent AE of the merge state
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virtual void* GetTopAECookie( void ); //@cmember get a cookie for the
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//top AE
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virtual void ClearAll(); //@cmember delete all AEs
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virtual BOOL CanUndo(); //@cmember something to undo?
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virtual void StartGroupTyping(); //@cmember starts group typing
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virtual void StopGroupTyping(); //@cmember stops group typing
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// Public methods; not part of IUndoMgr
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HRESULT EnableSingleLevelMode(); //@cmember RE1.0 undo mode
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void DisableSingleLevelMode(); //@cmember back to RE2.0 mode
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//@cmember are we in 1.0 mode?
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BOOL GetSingleLevelMode() { return _fSingleLevelMode; }
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CUndoStack( CTxtEdit *ped, DWORD & rdwLim, USFlags flags );
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private:
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~CUndoStack();
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struct UndoAction
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{
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IAntiEvent * pae;
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UNDONAMEID id;
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};
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void Next( void ); //@cmember advances by 1
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void Prev( void ); //@cmember advances by -1
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DWORD GetPrev( void ); //@cmember get previous index
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//@cmember TRUE iff cookie
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// ae in in ae list
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BOOL IsCookieInList( IAntiEvent *pae, IAntiEvent *paeCookie);
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//@cmember transfer this object to
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// a new stack
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void TransferToNewBuffer(UndoAction *prgnew, DWORD dwLimNew);
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UndoAction *_prgActions; //@cmember The list of AEs
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DWORD _dwLim; //@cmember the undo limit
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DWORD _index; //@cmember current index
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CTxtEdit * _ped; //@cmember Big Papa
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unsigned long _fGroupTyping : 1; //@cmember Group Typing flag
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unsigned long _fMerge : 1; //@cmember Merge flag
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unsigned long _fRedo : 1; //@cmember Stack is the redo
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// stack.
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unsigned long _fSingleLevelMode :1; //@cmember Indicates if single
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// level undo mode is on. Valid
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// only for the undo stack
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// but not the redo stack
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};
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/*
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* IUndoBuilder
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*
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* Purpose:
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* provides a closure for collecting a sequence of anti-events (such
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* as all of the anti-events involved in doing an intra-edit drag-move
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* operation.
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*/
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class IUndoBuilder
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{
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public:
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// Names anti-event collection
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virtual void SetNameID( UNDONAMEID idName ) = 0;
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// Adds a new anti-event to the collection
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virtual HRESULT AddAntiEvent( IAntiEvent *pae ) = 0;
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// Gets top most anti-event in this undo context. This method
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// is useful for grouped typing (merging anti-events)
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virtual IAntiEvent *GetTopAntiEvent( ) = 0;
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// Commits anti-event collection
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virtual HRESULT Done( void ) = 0;
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// Get rid of any anti-events that have been collected.
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virtual void Discard( void ) = 0;
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// Notify that a group-typing session should start (forwarded
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// to the undo manager)
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virtual void StartGroupTyping() = 0;
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// Notify that a group-typing session should stop (forwarded
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// to the undo manager)
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virtual void StopGroupTyping() = 0;
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};
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/*
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* UBFlags
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*
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* @enum
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* flags affecting the behaviour of Undo builders
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*/
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enum UBFlags
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{
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UB_AUTOCOMMIT = 1, //@emem call IUndoBuilder::Done before delete
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UB_REDO = 2, //@emem Undo builder is for REDO functionality
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UB_DONTFLUSHREDO = 4 //@emem don't flush redo stack when adding
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// anti-events to the undo stack
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};
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/*
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* CGenUndoBuilder
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*
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* @class
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* A general purpose undo builder. It can be easily allocated and freed
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* on the stack and simply puts new anti-events at the beginning of an
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* anti-event linked list. NO attempt is made to optimize or reorder
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* anti-events.
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*/
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class CGenUndoBuilder : public IUndoBuilder, public IReEntrantComponent
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{
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//@access Public methods
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public:
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virtual void SetNameID( UNDONAMEID idName ); //@cmember set the name
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virtual HRESULT AddAntiEvent(IAntiEvent *pae); //@cmember add an AE
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virtual IAntiEvent *GetTopAntiEvent( ); //@cmember get top AE
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virtual HRESULT Done( void ); //@cmember Commit AEs
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virtual void Discard( void ); //@cmember Discard AEs
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virtual void StartGroupTyping(void); //@cmember start GT
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virtual void StopGroupTyping(void); //@cmember stop GT
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CGenUndoBuilder(CTxtEdit *ped, DWORD flags, //@cmember Constructor
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IUndoBuilder **ppubldr = NULL);
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~CGenUndoBuilder( ); //@cmember Destructor
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// IReEntrantComponent methods
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virtual void OnEnterContext() {;} //@cmember reentered notify
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//@access Private methods
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private:
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IUndoBuilder * _publdrPrev; //@cmember Ptr to undobldr
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// higher in stack
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IUndoMgr * _pundo; //@cmember Ptr to undo mgr
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CTxtEdit * _ped; //@cmember Ptr to edit contxt
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UNDONAMEID _idName; //@cmember current name
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IAntiEvent * _pfirstae; //@cmember AE list
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UINT _fAutoCommit:1; //@cmember AutoCommit on?
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UINT _fStartGroupTyping:1; //@cmember GroupTyping on?
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UINT _fRedo:1; //@cmember UB destination is
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// the redo stack
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UINT _fDontFlushRedo:1; //@cmember Don't flush redo
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// stack; i.e. we are
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// invoking a redo action
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UINT _fInactive:1; //@cmember TRUE if undo enabled
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};
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/*
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* CUndoStackGuard
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*
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* @class
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* A stack based class which helps manage re-entrancy for the undo stack.
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*/
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class CUndoStackGuard : public IReEntrantComponent
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{
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//@access Public Methods
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public:
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virtual void OnEnterContext(); //@cmember reentered notify
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CUndoStackGuard(CTxtEdit *ped); //@cmember Constructor
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~CUndoStackGuard(); //@cmember Destructor
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//@cmember Execute the undo
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// actions in <p pae>
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HRESULT SafeUndo(IAntiEvent *pae, IUndoBuilder *publdr);
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BOOL WasReEntered() { return _fReEntered; } //@cmember return the
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// re-entered flag
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//@access Private Data
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private:
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CTxtEdit * _ped; //@cmember Edit context
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volatile IAntiEvent * _paeNext; //@cmember Loop index for
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// the ae's
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volatile HRESULT _hr; //@cmember Cached hr
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IUndoBuilder * _publdr; //@cmember Undo/redo
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// context
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BOOL _fReEntered; //@cmember Have we been
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// been re-entered?
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};
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// Helper Functions.
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// Loop through a chain of anti-events and destroy them
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void DestroyAEList(IAntiEvent *pae);
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// Loop through a chain of anti-events and call OnCommit
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void CommitAEList(IAntiEvent *pae, CTxtEdit *ped);
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// Handles merging and/or creation of selection anti-event info
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HRESULT HandleSelectionAEInfo(CTxtEdit *ped, IUndoBuilder *publdr,
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LONG cp, LONG cch, LONG cpNext, LONG cchNext, SELAE flags);
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#endif // !__M_UNDO_H__
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