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Diffstat (limited to 'examples/graphicsview/dragdroprobot/coloritem.cpp')
-rw-r--r-- | examples/graphicsview/dragdroprobot/coloritem.cpp | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/examples/graphicsview/dragdroprobot/coloritem.cpp b/examples/graphicsview/dragdroprobot/coloritem.cpp new file mode 100644 index 0000000000..81e8f5607b --- /dev/null +++ b/examples/graphicsview/dragdroprobot/coloritem.cpp @@ -0,0 +1,142 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor +** the names of its contributors may be used to endorse or promote +** products derived from this software without specific prior written +** permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui> + +#include "coloritem.h" + +//! [0] +ColorItem::ColorItem() + : color(qrand() % 256, qrand() % 256, qrand() % 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); + setAcceptedMouseButtons(Qt::LeftButton); +} +//! [0] + +//! [1] +QRectF ColorItem::boundingRect() const +{ + return QRectF(-15.5, -15.5, 34, 34); +} +//! [1] + +//! [2] +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); +} +//! [2] + +//! [3] +void ColorItem::mousePressEvent(QGraphicsSceneMouseEvent *) +{ + setCursor(Qt::ClosedHandCursor); +} +//! [3] + +//! [5] +void ColorItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event) +{ + if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton)) + .length() < QApplication::startDragDistance()) { + return; + } + + QDrag *drag = new QDrag(event->widget()); + QMimeData *mime = new QMimeData; + drag->setMimeData(mime); +//! [5] + +//! [6] + static int n = 0; + if (n++ > 2 && (qrand() % 3) == 0) { + QImage image(":/images/head.png"); + mime->setImageData(image); + + drag->setPixmap(QPixmap::fromImage(image).scaled(30, 40)); + drag->setHotSpot(QPoint(15, 30)); +//! [6] +//! [7] + } 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::white); + + QPainter painter(&pixmap); + painter.translate(15, 15); + painter.setRenderHint(QPainter::Antialiasing); + paint(&painter, 0, 0); + painter.end(); + + pixmap.setMask(pixmap.createHeuristicMask()); + + drag->setPixmap(pixmap); + drag->setHotSpot(QPoint(15, 20)); + } +//! [7] + +//! [8] + drag->exec(); + setCursor(Qt::OpenHandCursor); +} +//! [8] + +//! [4] +void ColorItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *) +{ + setCursor(Qt::OpenHandCursor); +} +//! [4] |