haiku-beta6/src/kits/interface/BTextView/UndoBuffer.h

//------------------------------------------------------------------------------
//	Copyright (c) 2003-2004, Haiku, Inc.
//
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//	Software is furnished to do so, subject to the following conditions:
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//	The above copyright notice and this permission notice shall be included in
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//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//	DEALINGS IN THE SOFTWARE.
//
//	File Name:		UndoBuffer.h
//	Author:			Stefano Ceccherini ([email protected])
//	Description:	_BUndoBuffer_ and its subclasses 
//					handle different types of Undo operations.
//------------------------------------------------------------------------------
#ifndef __UNDOBUFFER_H
#define __UNDOBUFFER_H

#include <TextView.h>


class BClipboard;

class _BUndoBuffer_ {
public:
	_BUndoBuffer_(BTextView *, undo_state);
	virtual ~_BUndoBuffer_();

	void Undo(BClipboard *);
	undo_state State(bool *);

protected:
	virtual void UndoSelf(BClipboard *);
	virtual void RedoSelf(BClipboard *);
	
	BTextView *fTextView;
	int32 fStart;
	int32 fEnd;

	char *fTextData;
	int32 fTextLength;
	text_run_array *fRunArray;
	int32 fRunArrayLength;
	
	bool fRedo;

private:
	undo_state fState;
};


//  ******** _BCutUndoBuffer_ *******
class _BCutUndoBuffer_ : public _BUndoBuffer_ {
public:
	_BCutUndoBuffer_(BTextView *textView);
	~_BCutUndoBuffer_();

protected:
	virtual void RedoSelf(BClipboard *);
};


//  ******** _BPasteUndoBuffer_ *******
class _BPasteUndoBuffer_ : public _BUndoBuffer_ {
public:
	_BPasteUndoBuffer_(BTextView *, const char *, int32, text_run_array *, int32);
	~_BPasteUndoBuffer_();

protected:
	virtual void UndoSelf(BClipboard *);
	virtual void RedoSelf(BClipboard *);

private:
	char *fPasteText;
	int32 fPasteTextLength;
	text_run_array *fPasteRunArray;
	int32 fPasteRunArrayLength;
};


//  ******** _BClearUndoBuffer_ *******
class _BClearUndoBuffer_ : public _BUndoBuffer_ {
public:
	_BClearUndoBuffer_(BTextView *textView);
	~_BClearUndoBuffer_();

protected:
	virtual void RedoSelf(BClipboard *);
};


//  ******** _BDropUndoBuffer_ ********
class _BDropUndoBuffer_ : public _BUndoBuffer_ {
public:
	_BDropUndoBuffer_(BTextView *, char const *, int32, text_run_array *, int32, int32, bool);
	~_BDropUndoBuffer_();

protected:
	virtual void UndoSelf(BClipboard *);
	virtual void RedoSelf(BClipboard *);

private:
	char *fDropText;
	int32 fDropTextLength;
	text_run_array *fDropRunArray;
	int32 fDropRunArrayLength;
	
	int32 fDropLocation;
	bool fInternalDrop;
};


//  ******** _BTypingUndoBuffer_ ********
class _BTypingUndoBuffer_ : public _BUndoBuffer_ {
public:
	_BTypingUndoBuffer_(BTextView *);
	~_BTypingUndoBuffer_();

	void InputCharacter(int32);
	void BackwardErase();
	void ForwardErase();

protected:
	virtual void RedoSelf(BClipboard *);
	virtual void UndoSelf(BClipboard *);

private:
	void Reset();
	
	char *fTypedText;
	int32 fTypedStart;
	int32 fTypedEnd;
	int32 fUndone;
};

#endif //__UNDOBUFFER_H