/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the examples of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui>+
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+
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#include "commands.h"+
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#include "diagramitem.h"+
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+
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//! [0]+
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MoveCommand::MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,+
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                 QUndoCommand *parent)+
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    : QUndoCommand(parent)+
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{+
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    myDiagramItem = diagramItem;+
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    newPos = diagramItem->pos();+
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    myOldPos = oldPos;+
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}+
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//! [0]+
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+
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//! [1]+
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bool MoveCommand::mergeWith(const QUndoCommand *command)+
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{+
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    const MoveCommand *moveCommand = static_cast<const MoveCommand *>(command);+
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    DiagramItem *item = moveCommand->myDiagramItem;+
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+
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    if (myDiagramItem != item)+
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    return false;+
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+
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    newPos = item->pos();+
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    setText(QObject::tr("Move %1")+
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        .arg(createCommandString(myDiagramItem, newPos)));+
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+
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    return true;+
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}+
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//! [1]+
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+
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//! [2]+
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void MoveCommand::undo()+
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{+
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    myDiagramItem->setPos(myOldPos);+
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    myDiagramItem->scene()->update();+
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    setText(QObject::tr("Move %1")+
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        .arg(createCommandString(myDiagramItem, newPos)));+
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}+
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//! [2]+
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+
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//! [3]+
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void MoveCommand::redo()+
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{+
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    myDiagramItem->setPos(newPos);+
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    setText(QObject::tr("Move %1")+
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        .arg(createCommandString(myDiagramItem, newPos)));+
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}+
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//! [3]+
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+
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//! [4]+
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DeleteCommand::DeleteCommand(QGraphicsScene *scene, QUndoCommand *parent)+
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    : QUndoCommand(parent)+
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{+
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    myGraphicsScene = scene;+
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    QList<QGraphicsItem *> list = myGraphicsScene->selectedItems();+
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    list.first()->setSelected(false);+
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    myDiagramItem = static_cast<DiagramItem *>(list.first());+
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    setText(QObject::tr("Delete %1")+
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        .arg(createCommandString(myDiagramItem, myDiagramItem->pos())));+
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}+
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//! [4]+
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+
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//! [5]+
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void DeleteCommand::undo()+
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{+
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    myGraphicsScene->addItem(myDiagramItem);+
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    myGraphicsScene->update();+
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}+
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//! [5]+
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+
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//! [6]+
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void DeleteCommand::redo()+
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{+
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    myGraphicsScene->removeItem(myDiagramItem);+
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}+
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//! [6]+
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+
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//! [7]+
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AddCommand::AddCommand(DiagramItem::DiagramType addType,+
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                       QGraphicsScene *scene, QUndoCommand *parent)+
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    : QUndoCommand(parent)+
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{+
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    static int itemCount = 0;+
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+
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    myGraphicsScene = scene;+
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    myDiagramItem = new DiagramItem(addType);+
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    initialPosition = QPointF((itemCount * 15) % int(scene->width()),+
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                              (itemCount * 15) % int(scene->height()));+
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    scene->update();+
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    ++itemCount;+
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    setText(QObject::tr("Add %1")+
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        .arg(createCommandString(myDiagramItem, initialPosition)));+
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}+
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//! [7]+
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+
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//! [8]+
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void AddCommand::undo()+
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{+
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    myGraphicsScene->removeItem(myDiagramItem);+
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    myGraphicsScene->update();+
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}+
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//! [8]+
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+
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//! [9]+
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void AddCommand::redo()+
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{+
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    myGraphicsScene->addItem(myDiagramItem);+
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    myDiagramItem->setPos(initialPosition);+
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    myGraphicsScene->clearSelection();+
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    myGraphicsScene->update();+
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}+
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//! [9]+
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+
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QString createCommandString(DiagramItem *item, const QPointF &pos)+
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{+
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    return QObject::tr("%1 at (%2, %3)")+
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        .arg(item->diagramType() == DiagramItem::Box ? "Box" : "Triangle")+
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        .arg(pos.x()).arg(pos.y());+
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}+
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