roundrectitem.cpp Example File
graphicsview/padnavigator/roundrectitem.cpp
#include "roundrectitem.h"
#include <QtGui/QtGui>
RoundRectItem::RoundRectItem(const QRectF &rect, const QColor &color, QWidget *embeddedWidget)
: QGraphicsRectItem(rect),
col(color),
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());
gradient.setColorAt(0, col);
gradient.setColorAt(1, col.dark(int(200 + lastVal * 50)));
painter->setBrush(gradient);
} else {
painter->setBrush(col);
}
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));
}