coloritem.cpp Example File
graphicsview/dragdroprobot/coloritem.cpp
/****************************************************************************
**
** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <QtGui>
#include "coloritem.h"
ColorItem::ColorItem()
: color(rand() % 256, rand() % 256, rand() % 256)
{
setToolTip(QString("QColor(%1, %2, %3)\n%4")
.arg(color.red()).arg(color.green()).arg(color.blue())
.arg("Click and drag this color onto the robot!"));
setCursor(Qt::OpenHandCursor);
}
QRectF ColorItem::boundingRect() const
{
return QRectF(-15.5, -15.5, 34, 34);
}
void ColorItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option);
Q_UNUSED(widget);
painter->setPen(Qt::NoPen);
painter->setBrush(Qt::darkGray);
painter->drawEllipse(-12, -12, 30, 30);
painter->setPen(QPen(Qt::black, 1));
painter->setBrush(QBrush(color));
painter->drawEllipse(-15, -15, 30, 30);
}
void ColorItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
if (event->button() != Qt::LeftButton) {
event->ignore();
return;
}
QDrag *drag = new QDrag(event->widget());
QMimeData *mime = new QMimeData;
drag->setMimeData(mime);
static int n = 0;
if (n++ > 2 && (rand() % 3) == 0) {
QImage image(":/images/head.png");
mime->setImageData(image);
drag->setPixmap(QPixmap::fromImage(image).scaled(30, 40));
drag->setHotSpot(QPoint(30, 40));
} else {
mime->setColorData(color);
mime->setText(QString("#%1%2%3")
.arg(color.red(), 2, 16, QLatin1Char('0'))
.arg(color.green(), 2, 16, QLatin1Char('0'))
.arg(color.blue(), 2, 16, QLatin1Char('0')));
QPixmap pixmap(34, 34);
pixmap.fill(Qt::transparent);
QPainter painter(&pixmap);
painter.translate(15, 15);
painter.setRenderHint(QPainter::Antialiasing);
paint(&painter, 0, 0);
painter.end();
drag->setPixmap(pixmap);
drag->setHotSpot(QPoint(15, 20));
}
drag->start();
}