2011-04-27 10:05:43 +00:00
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/****************************************************************************
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**
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2016-01-22 12:24:00 +00:00
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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2011-04-27 10:05:43 +00:00
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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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** $QT_BEGIN_LICENSE:BSD$
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2016-01-22 12:24:00 +00:00
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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2011-04-27 10:05:43 +00:00
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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2015-02-13 11:15:33 +00:00
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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2012-09-19 12:28:29 +00:00
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**
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2011-04-27 10:05:43 +00:00
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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2012-01-24 06:17:24 +00:00
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**
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2011-04-27 10:05:43 +00:00
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "commands.h"
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#include "diagramitem.h"
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2019-09-06 18:27:33 +00:00
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#include <QGraphicsScene>
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2011-04-27 10:05:43 +00:00
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//! [0]
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MoveCommand::MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,
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2019-09-06 18:27:33 +00:00
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QUndoCommand *parent)
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: QUndoCommand(parent), myDiagramItem(diagramItem)
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, myOldPos(oldPos), newPos(diagramItem->pos())
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2011-04-27 10:05:43 +00:00
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{
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}
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//! [0]
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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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if (myDiagramItem != item)
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2019-09-06 18:27:33 +00:00
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return false;
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2011-04-27 10:05:43 +00:00
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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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return true;
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}
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//! [1]
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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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//! [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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//! [4]
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DeleteCommand::DeleteCommand(QGraphicsScene *scene, QUndoCommand *parent)
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2019-09-06 18:27:33 +00:00
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: QUndoCommand(parent), myGraphicsScene(scene)
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2011-04-27 10:05:43 +00:00
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{
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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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//! [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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//! [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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//! [7]
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AddCommand::AddCommand(DiagramItem::DiagramType addType,
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QGraphicsScene *scene, QUndoCommand *parent)
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2019-09-06 18:27:33 +00:00
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: QUndoCommand(parent), myGraphicsScene(scene)
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2011-04-27 10:05:43 +00:00
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{
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static int itemCount = 0;
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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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AddCommand::~AddCommand()
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{
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if (!myDiagramItem->scene())
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delete myDiagramItem;
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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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//! [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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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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