227 lines
7.1 KiB
C
227 lines
7.1 KiB
C
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/*
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* @doc INTERNAL
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*
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* @module _RUNPTR.H -- Text run and run pointer class defintion |
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*
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* Original Author: <nl>
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* Christian Fortini
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*
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* History: <nl>
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* 6/25/95 alexgo Commenting and Cleanup
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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 _RUNPTR_H
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#define _RUNPTR_H
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#include "_array.h"
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#include "_doc.h"
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typedef CArray<CTxtRun> CRunArray;
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/*
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* CRunPtrBase
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*
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* @class Base run pointer functionality. Keeps a position within an array
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* of text runs.
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*
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* @devnote Run pointers go through three different possible states :
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*
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* NULL: there is no data and no array (frequently a startup condition) <nl>
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* <mf CRunPtrBase::SetRunArray> will transition from this state to
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* the Empty state. It is typically up to the derived class to
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* define when that method should be called. IsValid() fails. <nl>
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*
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* <md CRunPtrBase::_pRuns> == NULL <nl>
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* <md CRunPtrBase::_iRun> == 0 <nl>
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* <md CRunPtrBase::_ich> == 0 <nl>
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*
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* Empty: an array class exists, but there is no data (can happen if all
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* of the elements in the array are deleted). IsValid() fails.<nl>
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* <md CRunPtrBase::_pRuns> != NULL <nl>
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* <md CRunPtrBase::_iRun> == 0 <nl>
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* <md CRunPtrBase::_ich> <gt>= 0 <nl>
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* <md CRunPtrBase::_pRuns-<gt>Count()> == 0 <nl>
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*
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* Normal: the array class exists and has data; IsValid() succeeds and
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* <md CRunPtrBase::_pRuns-<gt>Elem[] is defined <nl>
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* <md CRunPtrBase::_pRuns> != NULL <nl>
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* <md CRunPtrBase::_iRun> >= 0 <nl>
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* <md CRunPtrBase::_ich> >= 0 <nl>
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* <md _pRuns>-<gt>Count() > 0 <nl>
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*
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* Note that in order to support the empty and normal states, the actual
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* array element at <md CRunPtrBase::_iRun> must be explicitly fetched in
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* any method that may need it.
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*
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* Currently, there is no way to transition to the NULL state from any of
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* the other states. If we needed to, we could support that by explicitly
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* fetching the array from the document on demand.
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*
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* Note that only <md CRunPtrBase::_iRun> is kept. We could also keep
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* a pointer to the actual run (i.e. _pRun). Earlier versions of this
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* engine did in fact do this. I've opted to not do this for several
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* reasons: <nl>
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* 1. If IsValid(), _pRun is *always* available by calling Elem(_iRun).
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* Therefore, there is nominally no need to keep both _iRun and _pRun.<nl>
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* 2. Run pointers are typically used to either just move around
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* and then fetch data or move and fetch data every time (like during
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* a measuring loop). In the former case, there is no need to always
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* bind _pRun; you can just do it on demand. In the latter case, the
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* two models are equivalent.
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*/
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class CRunPtrBase
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{
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friend class CDisplayML;
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friend class CDisplaySL;
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//@access Public methods
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public:
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#ifdef DEBUG
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BOOL Invariant() const; //@cmember Invariant tests
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void ValidatePtr(void *pRun) const; //@cmember Validate <p pRun>
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LONG CalcTextLength() const; //@cmember Get total cch in runs
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#define VALIDATE_PTR(pRun) ValidatePtr(pRun)
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#else
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#define VALIDATE_PTR(pRun)
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#endif // DEBUG
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CRunPtrBase(CRunArray *pRuns); //@cmember Constructor
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CRunPtrBase(CRunPtrBase& rp); //@cmember Constructor
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// Run Control
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void SetRunArray(CRunArray *pRuns) //@cmember Set run array for this
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{ // run ptr
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_pRuns = pRuns;
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}
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BOOL SetRun(LONG iRun, LONG ich); //@cmember Set this runptr to run
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// <p iRun> & char offset <p ich>
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BOOL NextRun(); //@cmember Advance to next run
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BOOL PrevRun(); //@cmember Go back to prev run
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BOOL ChgRun(LONG cRun) //@cmember Move <p cRun> runs
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{ // returning TRUE if successful
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return SetRun(_iRun + cRun, 0);
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}
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//@cmember Count <p cRun> runs
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LONG CountRuns(LONG &cRun, // returning cch counted and
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LONG cchMax, // updating <p cRun>
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LONG cp,
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LONG cchText) const;
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//@cmember Find run range limits
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void FindRun (LONG *pcpMin,
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LONG *pcpMost, LONG cpMin, LONG cch, LONG cchText) const;
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CTxtRun * GetRun(LONG cRun) const; //@cmember Retrieve run element at
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// offset <p cRun> from this run
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LONG Count() const //@cmember Get count of runs
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{
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return _pRuns->Count();
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}
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BOOL SameRuns(CRunPtrBase *prp) //@cmember Return TRUE iff same runs
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{
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return _pRuns == prp->_pRuns;
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}
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BOOL SameRun(CRunPtrBase *prp)
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{
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return SameRuns(prp) && _iRun == prp->_iRun;
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}
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// Character position control
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LONG BindToCp(LONG cp); //@cmember Set cp for this run ptr = <p cp>
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LONG CalculateCp() const;//@cmember Add _cch's up to _iRun, _ich
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LONG AdvanceCp(LONG cch);//@cmember Advance cp by <p cch> chars
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void AdjustBackward(); //@cmember If on the edge of two runs,
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// adjust to end of left (previous) run
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void AdjustForward(); //@cmember If at the edge of two runs,
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// adjust to start of right (next) run
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LONG GetIch() const //@cmember Return <md CRunPtrBase::_ich>
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{Assert(IsValid()); return _ich;}
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LONG GetCchLeft() const; //@cmember Return GetRun(0)->_cch - GetIch()
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BOOL IsValid() const; //@cmember Return FALSE if run ptr is in
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// empty or NULL states. TRUE otherwise
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void SetToNull(); //@cmember Clears data from run pointer
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//@access Protected Data
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protected:
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CRunArray * _pRuns; //@cmember Pointer to CTxtRun array
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LONG _iRun; //@cmember Index of current run in array
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LONG _ich; //@cmember Char offset inside current run
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};
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/*
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* CRunPtr (template)
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*
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* @class a template over CRunPtrBase allowing for type-safe versions of
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* run pointers
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*
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* @tcarg class | CElem | run array class to be used
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*
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* @base public | CRunPtrBase
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*/
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template <class CElem>
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class CRunPtr : public CRunPtrBase
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{
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public:
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CRunPtr (void) //@cmember Constructor
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: CRunPtrBase (0) {}
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CRunPtr (CRunArray *pRuns) //@cmember Constructor
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: CRunPtrBase (pRuns) {}
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CRunPtr (CRunPtrBase& rp) //@cmember Constructor
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: CRunPtrBase (rp) {}
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// Array management
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CElem * Add (LONG cRun, LONG *pielIns) //@cmember Add <p cRun>
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{ // elements at end of array
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return (CElem *)_pRuns->Add(cRun, pielIns);
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}
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CElem * Insert (LONG cRun) //@cmember Insert <p cRun>
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{ // elements at current pos
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return (CElem *)_pRuns->Insert(_iRun, cRun);
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}
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void Remove (LONG cRun) //@cmember Remove <p cRun>
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{ // elements at current pos
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_pRuns->Remove (_iRun, cRun);
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}
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//@cmember Replace <p cRun> elements
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// at current position with those
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// from <p parRun>
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BOOL Replace (LONG cRun, CArrayBase *parRun)
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{
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return _pRuns->Replace(_iRun, cRun, parRun);
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}
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CElem * Elem(LONG iRun) const //@cmember Get ptr to run <p iRun>
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{
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return (CElem *)_pRuns->Elem(iRun);
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}
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CElem * GetRun(LONG cRun) const //@cmember Get ptr <p cRun> runs
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{ // away from current run
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return Elem(_iRun + cRun);
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}
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void IncPtr(CElem *&pRun) const //@cmember Increment ptr <p pRun>
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{
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VALIDATE_PTR(pRun); // Allow invalid ptr after ++ for
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pRun++; // for loops
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}
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CElem * GetPtr(CElem *pRun, LONG cRun) const//@cmember Get ptr <p cRun>
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{ // runs away from ptr <p pRun>
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VALIDATE_PTR(pRun + cRun);
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return pRun + cRun;
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}
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};
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#endif
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