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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "coloritem.h" |
| |
| #include <QApplication> |
| #include <QBitmap> |
| #include <QCursor> |
| #include <QDrag> |
| #include <QGraphicsSceneMouseEvent> |
| #include <QMimeData> |
| #include <QPainter> |
| #include <QRandomGenerator> |
| #include <QWidget> |
| |
| //! [0] |
| ColorItem::ColorItem() |
| : color(QRandomGenerator::global()->bounded(256), QRandomGenerator::global()->bounded(256), QRandomGenerator::global()->bounded(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 && QRandomGenerator::global()->bounded(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, nullptr, nullptr); |
| 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] |