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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file 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.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
#include "commands.h"
#include "diagramitem.h"
//! [0]
MoveCommand::MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,
QUndoCommand *parent)
: QUndoCommand(parent)
{
myDiagramItem = diagramItem;
newPos = diagramItem->pos();
myOldPos = oldPos;
}
//! [0]
//! [1]
bool MoveCommand::mergeWith(const QUndoCommand *command)
{
const MoveCommand *moveCommand = static_cast<const MoveCommand *>(command);
DiagramItem *item = moveCommand->myDiagramItem;
if (myDiagramItem != item)
return false;
newPos = item->pos();
setText(QObject::tr("Move %1")
.arg(createCommandString(myDiagramItem, newPos)));
return true;
}
//! [1]
//! [2]
void MoveCommand::undo()
{
myDiagramItem->setPos(myOldPos);
myDiagramItem->scene()->update();
setText(QObject::tr("Move %1")
.arg(createCommandString(myDiagramItem, newPos)));
}
//! [2]
//! [3]
void MoveCommand::redo()
{
myDiagramItem->setPos(newPos);
setText(QObject::tr("Move %1")
.arg(createCommandString(myDiagramItem, newPos)));
}
//! [3]
//! [4]
DeleteCommand::DeleteCommand(QGraphicsScene *scene, QUndoCommand *parent)
: QUndoCommand(parent)
{
myGraphicsScene = scene;
QList<QGraphicsItem *> list = myGraphicsScene->selectedItems();
list.first()->setSelected(false);
myDiagramItem = static_cast<DiagramItem *>(list.first());
setText(QObject::tr("Delete %1")
.arg(createCommandString(myDiagramItem, myDiagramItem->pos())));
}
//! [4]
//! [5]
void DeleteCommand::undo()
{
myGraphicsScene->addItem(myDiagramItem);
myGraphicsScene->update();
}
//! [5]
//! [6]
void DeleteCommand::redo()
{
myGraphicsScene->removeItem(myDiagramItem);
}
//! [6]
//! [7]
AddCommand::AddCommand(DiagramItem::DiagramType addType,
QGraphicsScene *scene, QUndoCommand *parent)
: QUndoCommand(parent)
{
static int itemCount = 0;
myGraphicsScene = scene;
myDiagramItem = new DiagramItem(addType);
initialPosition = QPointF((itemCount * 15) % int(scene->width()),
(itemCount * 15) % int(scene->height()));
scene->update();
++itemCount;
setText(QObject::tr("Add %1")
.arg(createCommandString(myDiagramItem, initialPosition)));
}
//! [7]
//! [8]
void AddCommand::undo()
{
myGraphicsScene->removeItem(myDiagramItem);
myGraphicsScene->update();
}
//! [8]
//! [9]
void AddCommand::redo()
{
myGraphicsScene->addItem(myDiagramItem);
myDiagramItem->setPos(initialPosition);
myGraphicsScene->clearSelection();
myGraphicsScene->update();
}
//! [9]
QString createCommandString(DiagramItem *item, const QPointF &pos)
{
return QObject::tr("%1 at (%2, %3)")
.arg(item->diagramType() == DiagramItem::Box ? "Box" : "Triangle")
.arg(pos.x()).arg(pos.y());
}
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