2011-04-27 10:05:43 +00:00
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/****************************************************************************
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**
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2015-01-28 08:44:43 +00:00
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://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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** You may use this file under the terms of the BSD license as follows:
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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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2011-05-07 20:57:49 +00:00
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#include <QtWidgets>
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2011-04-27 10:05:43 +00:00
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#include "diagramscene.h"
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#include "diagramitem.h"
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DiagramScene::DiagramScene(QObject *parent)
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: QGraphicsScene(parent)
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{
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movingItem = 0;
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}
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void DiagramScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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QPointF mousePos(event->buttonDownScenePos(Qt::LeftButton).x(),
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event->buttonDownScenePos(Qt::LeftButton).y());
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2012-06-08 15:08:52 +00:00
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const QList<QGraphicsItem *> itemList = items(mousePos);
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movingItem = itemList.isEmpty() ? 0 : itemList.first();
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2011-04-27 10:05:43 +00:00
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if (movingItem != 0 && event->button() == Qt::LeftButton) {
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oldPos = movingItem->pos();
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}
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2013-03-14 23:42:15 +00:00
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clearSelection();
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2011-04-27 10:05:43 +00:00
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QGraphicsScene::mousePressEvent(event);
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}
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void DiagramScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
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{
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if (movingItem != 0 && event->button() == Qt::LeftButton) {
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if (oldPos != movingItem->pos())
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emit itemMoved(qgraphicsitem_cast<DiagramItem *>(movingItem),
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oldPos);
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movingItem = 0;
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}
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QGraphicsScene::mouseReleaseEvent(event);
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}
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