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/* This file is part of the KDE project
* Copyright (C) 2007 Thomas Zander <zander@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef ABSTRACTTEXTCOMMMAND_H
#define ABSTRACTTEXTCOMMMAND_H
#include <QUndoCommand>
class TextTool;
/**
* Base class for all commands that work together with the textTool.
* Due to the fact that QTextDocument has its own undo queue we need to do some trickery
* to integrate that into the apps.
* If your command in some way changes the document, it will create unwanted undo commands in the undoStack
* unless you inherit from this class and simply implement your undo and redo like this:
@code
void MyCommand::redo() {
TextCommandBase::redo();
UndoRedoFinalizer finalizer(m_tool);
// rest code
}
void MyCommand::undo() {
TextCommandBase::undo();
UndoRedoFinalizer finalizer(m_tool);
// rest code
}
@endcode
* @see TextTool::addCommand()
*/
class TextCommandBase : public QUndoCommand
{
public:
/// constructor
TextCommandBase(QUndoCommand *parent) : QUndoCommand(parent), m_tool(0) {}
virtual ~TextCommandBase() {}
/// method called by the tool.
void setTool(TextTool *tool) {
m_tool = tool;
}
// reimplemented from QUndoCommand
virtual void redo();
// reimplemented from QUndoCommand
virtual void undo();
/// Sets the m_allowAddUndoCommand of the associated tool
void setAllow(bool set);
protected:
class UndoRedoFinalizer
{
public:
UndoRedoFinalizer(TextCommandBase* parent) : m_parent(parent) {}
~UndoRedoFinalizer();
private:
TextCommandBase* m_parent;
};
TextTool *m_tool;
};
#endif
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