143 lines
4.4 KiB
C++
143 lines
4.4 KiB
C++
/****************************************************************************
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**
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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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**
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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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** * 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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**
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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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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtGui>
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#include "coloritem.h"
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//! [0]
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ColorItem::ColorItem()
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: color(qrand() % 256, qrand() % 256, qrand() % 256)
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{
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setToolTip(QString("QColor(%1, %2, %3)\n%4")
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.arg(color.red()).arg(color.green()).arg(color.blue())
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.arg("Click and drag this color onto the robot!"));
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setCursor(Qt::OpenHandCursor);
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setAcceptedMouseButtons(Qt::LeftButton);
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}
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//! [0]
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//! [1]
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QRectF ColorItem::boundingRect() const
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{
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return QRectF(-15.5, -15.5, 34, 34);
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}
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//! [1]
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//! [2]
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void ColorItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(option);
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Q_UNUSED(widget);
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painter->setPen(Qt::NoPen);
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painter->setBrush(Qt::darkGray);
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painter->drawEllipse(-12, -12, 30, 30);
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painter->setPen(QPen(Qt::black, 1));
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painter->setBrush(QBrush(color));
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painter->drawEllipse(-15, -15, 30, 30);
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}
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//! [2]
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//! [3]
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void ColorItem::mousePressEvent(QGraphicsSceneMouseEvent *)
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{
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setCursor(Qt::ClosedHandCursor);
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}
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//! [3]
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//! [5]
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void ColorItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton))
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.length() < QApplication::startDragDistance()) {
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return;
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}
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QDrag *drag = new QDrag(event->widget());
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QMimeData *mime = new QMimeData;
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drag->setMimeData(mime);
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//! [5]
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//! [6]
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static int n = 0;
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if (n++ > 2 && (qrand() % 3) == 0) {
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QImage image(":/images/head.png");
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mime->setImageData(image);
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drag->setPixmap(QPixmap::fromImage(image).scaled(30, 40));
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drag->setHotSpot(QPoint(15, 30));
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//! [6]
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//! [7]
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} else {
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mime->setColorData(color);
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mime->setText(QString("#%1%2%3")
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.arg(color.red(), 2, 16, QLatin1Char('0'))
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.arg(color.green(), 2, 16, QLatin1Char('0'))
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.arg(color.blue(), 2, 16, QLatin1Char('0')));
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QPixmap pixmap(34, 34);
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pixmap.fill(Qt::white);
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QPainter painter(&pixmap);
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painter.translate(15, 15);
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painter.setRenderHint(QPainter::Antialiasing);
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paint(&painter, 0, 0);
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painter.end();
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pixmap.setMask(pixmap.createHeuristicMask());
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drag->setPixmap(pixmap);
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drag->setHotSpot(QPoint(15, 20));
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}
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//! [7]
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//! [8]
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drag->exec();
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setCursor(Qt::OpenHandCursor);
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}
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//! [8]
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//! [4]
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void ColorItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *)
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{
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setCursor(Qt::OpenHandCursor);
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}
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//! [4]
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