Qt 4.4: roundrectitem.cpp Example File (graphicsview/padnavigator/roundrectitem.cpp)

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

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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));
     }