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/*
* Copyright (C) 2015-2016 Winfried Simon
*
* This software may be used under the terms of the GNU Lesser General
* Public License version 2.1 as published by the Free Software Foundation
* and appearing in the file license.txt included in the packaging of this file.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "commands.h"
#include <QUndoCommand>
// Helper class to store single byte commands
class CharCommand : public QUndoCommand
{
public:
enum CCmd {insert, removeAt, overwrite};
CharCommand(Chunks * chunks, CCmd cmd, qint64 charPos, char newChar,
QUndoCommand *parent=0);
void undo();
void redo();
bool mergeWith(const QUndoCommand *command);
int id() const { return 1234; }
private:
Chunks * _chunks;
qint64 _charPos;
bool _wasChanged;
char _newChar;
char _oldChar;
CCmd _cmd;
};
CharCommand::CharCommand(Chunks * chunks, CCmd cmd, qint64 charPos, char newChar, QUndoCommand *parent)
: QUndoCommand(parent)
, _chunks(chunks)
, _charPos(charPos)
, _wasChanged(false)
, _newChar(newChar)
, _oldChar('\0')
, _cmd(cmd)
{
}
bool CharCommand::mergeWith(const QUndoCommand *command)
{
const CharCommand *nextCommand = static_cast<const CharCommand *>(command);
bool result = false;
if (_cmd != CharCommand::removeAt)
{
if (nextCommand->_cmd == overwrite)
if (nextCommand->_charPos == _charPos)
{
_newChar = nextCommand->_newChar;
result = true;
}
}
return result;
}
void CharCommand::undo()
{
switch (_cmd)
{
case insert:
_chunks->removeAt(_charPos);
break;
case overwrite:
_chunks->overwrite(_charPos, _oldChar);
_chunks->setDataChanged(_charPos, _wasChanged);
break;
case removeAt:
_chunks->insert(_charPos, _oldChar);
_chunks->setDataChanged(_charPos, _wasChanged);
break;
}
}
void CharCommand::redo()
{
switch (_cmd)
{
case insert:
_chunks->insert(_charPos, _newChar);
break;
case overwrite:
_oldChar = (*_chunks)[_charPos];
_wasChanged = _chunks->dataChanged(_charPos);
_chunks->overwrite(_charPos, _newChar);
break;
case removeAt:
_oldChar = (*_chunks)[_charPos];
_wasChanged = _chunks->dataChanged(_charPos);
_chunks->removeAt(_charPos);
break;
}
}
UndoStack::UndoStack(Chunks * chunks, QObject * parent)
: QUndoStack(parent)
{
_chunks = chunks;
_parent = parent;
this->setUndoLimit(1000);
}
void UndoStack::insert(qint64 pos, char c)
{
if ((pos >= 0) && (pos <= _chunks->size()))
{
QUndoCommand *cc = new CharCommand(_chunks, CharCommand::insert, pos, c);
this->push(cc);
}
}
void UndoStack::insert(qint64 pos, const QByteArray &ba)
{
if ((pos >= 0) && (pos <= _chunks->size()))
{
QString txt = QString(tr("Inserting %1 bytes")).arg(ba.size());
beginMacro(txt);
for (int idx=0; idx < ba.size(); idx++)
{
QUndoCommand *cc = new CharCommand(_chunks, CharCommand::insert, pos + idx, ba.at(idx));
this->push(cc);
}
endMacro();
}
}
void UndoStack::removeAt(qint64 pos, qint64 len)
{
if ((pos >= 0) && (pos < _chunks->size()))
{
if (len==1)
{
QUndoCommand *cc = new CharCommand(_chunks, CharCommand::removeAt, pos, char(0));
this->push(cc);
}
else
{
QString txt = QString(tr("Delete %1 chars")).arg(len);
beginMacro(txt);
for (qint64 cnt=0; cnt<len; cnt++)
{
QUndoCommand *cc = new CharCommand(_chunks, CharCommand::removeAt, pos, char(0));
push(cc);
}
endMacro();
}
}
}
void UndoStack::overwrite(qint64 pos, char c)
{
if ((pos >= 0) && (pos < _chunks->size()))
{
QUndoCommand *cc = new CharCommand(_chunks, CharCommand::overwrite, pos, c);
this->push(cc);
}
}
void UndoStack::overwrite(qint64 pos, int len, const QByteArray &ba)
{
if ((pos >= 0) && (pos < _chunks->size()))
{
QString txt = QString(tr("Overwrite %1 chars")).arg(len);
beginMacro(txt);
removeAt(pos, len);
insert(pos, ba);
endMacro();
}
}
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