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roundrectitem.cpp Example File
graphicsview/padnavigator/roundrectitem.cpp

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 ** This file is part of the example classes of the Qt Toolkit.
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 #include "roundrectitem.h"

 #include <QtGui/QtGui>

 RoundRectItem::RoundRectItem(const QRectF &rect, const QBrush &brush, QWidget *embeddedWidget)
     : QGraphicsRectItem(rect),
       brush(brush),
       timeLine(75),
       lastVal(0),
       opa(1),
       proxyWidget(0)
 {
     connect(&timeLine, SIGNAL(valueChanged(qreal)),
             this, SLOT(updateValue(qreal)));

     if (embeddedWidget) {
         proxyWidget = new QGraphicsProxyWidget(this);
         proxyWidget->setFocusPolicy(Qt::StrongFocus);
         proxyWidget->setWidget(embeddedWidget);
         proxyWidget->setGeometry(boundingRect().adjusted(25, 25, -25, -25));
     }
 }

 void RoundRectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
 {
     QTransform x = painter->worldTransform();

     QLineF unit = x.map(QLineF(0, 0, 1, 1));
     if (unit.p1().x() > unit.p2().x() || unit.p1().y() > unit.p2().y()) {
         if (proxyWidget && proxyWidget->isVisible()) {
             proxyWidget->hide();
             proxyWidget->setGeometry(rect());
         }
         return;
     }

     if (proxyWidget && !proxyWidget->isVisible()) {
         proxyWidget->show();
         proxyWidget->setFocus();
     }
     if (proxyWidget && proxyWidget->pos() != QPoint())
         proxyWidget->setGeometry(boundingRect().adjusted(25, 25, -25, -25));

     painter->setOpacity(opacity());
     painter->setPen(Qt::NoPen);
     painter->setBrush(QColor(0, 0, 0, 64));
     painter->drawRoundRect(rect().translated(2, 2));

     if (!proxyWidget) {
         QLinearGradient gradient(rect().topLeft(), rect().bottomRight());
         const QColor col = brush.color();
         gradient.setColorAt(0, col);
         gradient.setColorAt(1, col.dark(int(200 + lastVal * 50)));
         painter->setBrush(gradient);
     } else {
         painter->setBrush(brush);
     }

     painter->setPen(QPen(Qt::black, 1));
     painter->drawRoundRect(rect());
     if (!pix.isNull()) {
         painter->scale(1.95, 1.95);
         painter->drawPixmap(-pix.width() / 2, -pix.height() / 2, pix);;
     }
 }

 QRectF RoundRectItem::boundingRect() const
 {
     qreal penW = 0.5;
     qreal shadowW = 2.0;
     return rect().adjusted(-penW, -penW, penW + shadowW, penW + shadowW);
 }

 void RoundRectItem::setPixmap(const QPixmap &pixmap)
 {
     pix = pixmap;
     if (scene() && isVisible())
         update();
 }

 qreal RoundRectItem::opacity() const
 {
     RoundRectItem *parent = parentItem() ? (RoundRectItem *)parentItem() : 0;
     return opa + (parent ? parent->opacity() : 0);
 }

 void RoundRectItem::setOpacity(qreal opacity)
 {
     opa = opacity;
     update();
 }

 void RoundRectItem::keyPressEvent(QKeyEvent *event)
 {
     if (event->isAutoRepeat() || event->key() != Qt::Key_Return
         || (timeLine.state() == QTimeLine::Running && timeLine.direction() == QTimeLine::Forward)) {
         QGraphicsRectItem::keyPressEvent(event);
         return;
     }

     timeLine.stop();
     timeLine.setDirection(QTimeLine::Forward);
     timeLine.start();
     emit activated();
 }

 void RoundRectItem::keyReleaseEvent(QKeyEvent *event)
 {
     if (event->key() != Qt::Key_Return) {
         QGraphicsRectItem::keyReleaseEvent(event);
         return;
     }
     timeLine.stop();
     timeLine.setDirection(QTimeLine::Backward);
     timeLine.start();
 }

 void RoundRectItem::updateValue(qreal value)
 {
     lastVal = value;
     if (!proxyWidget)
         setTransform(QTransform().scale(1 - value / 10.0, 1 - value / 10.0));
 }


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Qt 4.4.3