qt 圆形按钮

场景：QT怎么实现圆形按钮

QT如何实现圆形按钮?
请看这张图片: http://hi.****.net/attachment/201006/28/2702037_1277732191x7A4.png
是方形的一张图,但里面的蓝色区域是圆形的........

我想把我的程序中的按钮的icon设成这张图片,以实现windows自带的播放器Media player里的播放按钮那样的效果.......请教各位大侠怎样实现?

------解决方案--------------------

C/C++ code


 class Button : public QGraphicsWidget
 {
     Q_OBJECT
 public:
     Button(const QPixmap &pixmap, QGraphicsItem *parent = 0)
         : QGraphicsWidget(parent), _pix(pixmap)
     {
         setAcceptHoverEvents(true);
         setCacheMode(DeviceCoordinateCache);
     }

     QRectF boundingRect() const
     {
         return QRectF(-65, -65, 130, 130);
     }

     QPainterPath shape() const
     {
         QPainterPath path;
         path.addEllipse(boundingRect());
         return path;
     }

     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
     {
         bool down = option->state & QStyle::State_Sunken;
         QRectF r = boundingRect();
         QLinearGradient grad(r.topLeft(), r.bottomRight());
         grad.setColorAt(down ? 1 : 0, option->state & QStyle::State_MouseOver ? Qt::white : Qt::lightGray);
         grad.setColorAt(down ? 0 : 1, Qt::darkGray);
         painter->setPen(Qt::darkGray);
         painter->setBrush(grad);
         painter->drawEllipse(r);
         QLinearGradient grad2(r.topLeft(), r.bottomRight());
         grad.setColorAt(down ? 1 : 0, Qt::darkGray);
         grad.setColorAt(down ? 0 : 1, Qt::lightGray);
         painter->setPen(Qt::NoPen);
         painter->setBrush(grad);
         if (down)
             painter->translate(2, 2);
         painter->drawEllipse(r.adjusted(5, 5, -5, -5));
         painter->drawPixmap(-_pix.width()/2, -_pix.height()/2, _pix);
     }

 signals:
     void pressed();

 protected:
     void mousePressEvent(QGraphicsSceneMouseEvent *)
     {
         emit pressed();
         update();
     }

     void mouseReleaseEvent(QGraphicsSceneMouseEvent *)
     {
         update();
     }

 private:
     QPixmap _pix;
 };

------解决方案--------------------

C/C++ code


QPushButton *playButton = new QPushButton;
playButton->setIcon(QIcon(...));

------解决方案--------------------
一种方式像2楼一样， 另一种方式采用遮罩也行`··

C/C++ code


...
QPixmap pixmap;
QPushButton* pushButton = new QPushButton;

pushButton->setIcon(pixmap);
pushButton->setMask(pixMap.createHeuristicMask());
...

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