layoutitem.cpp Example File

graphicsview/basicgraphicslayouts/layoutitem.cpp
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#include "layoutitem.h" #include <QGradient> #include <QGraphicsLinearLayout> #include <QPainter> LayoutItem::LayoutItem(QGraphicsItem *parent/* = 0*/) : QGraphicsLayoutItem(), QGraphicsItem(parent) { m_pix = new QPixmap(QLatin1String(":/images/block.png")); setGraphicsItem(this); } LayoutItem::~LayoutItem() { delete m_pix; } void LayoutItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget /*= 0*/) { Q_UNUSED(widget); Q_UNUSED(option); QRectF frame(QPointF(0,0), geometry().size()); qreal w = m_pix->width(); qreal h = m_pix->height(); QGradientStops stops; // paint a background rect (with gradient) QLinearGradient gradient(frame.topLeft(), frame.topLeft() + QPointF(200,200)); stops << QGradientStop(0.0, QColor(60, 60, 60)); stops << QGradientStop(frame.height() / 2 / frame.height(), QColor(102, 176, 54)); //stops << QGradientStop(((frame.height() + h)/2 )/frame.height(), QColor(157, 195, 55)); stops << QGradientStop(1.0, QColor(215, 215, 215)); gradient.setStops(stops); painter->setBrush(QBrush(gradient)); painter->drawRoundedRect(frame, 10.0, 10.0); // paint a rect around the pixmap (with gradient) QPointF pixpos = frame.center() - (QPointF(w, h) / 2); QRectF innerFrame(pixpos, QSizeF(w, h)); innerFrame.adjust(-4, -4, 4, 4); gradient.setStart(innerFrame.topLeft()); gradient.setFinalStop(innerFrame.bottomRight()); stops.clear(); stops << QGradientStop(0.0, QColor(215, 255, 200)); stops << QGradientStop(0.5, QColor(102, 176, 54)); stops << QGradientStop(1.0, QColor(0, 0, 0)); gradient.setStops(stops); painter->setBrush(QBrush(gradient)); painter->drawRoundedRect(innerFrame, 10.0, 10.0); painter->drawPixmap(pixpos, *m_pix); } QRectF LayoutItem::boundingRect() const { return QRectF(QPointF(0,0), geometry().size()); } void LayoutItem::setGeometry(const QRectF &geom) { prepareGeometryChange(); QGraphicsLayoutItem::setGeometry(geom); setPos(geom.topLeft()); } QSizeF LayoutItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const { switch (which) { case Qt::MinimumSize: case Qt::PreferredSize: // Do not allow a size smaller than the pixmap with two frames around it. return m_pix->size() + QSize(12, 12); case Qt::MaximumSize: return QSizeF(1000,1000); default: break; } return constraint; }