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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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());
+}