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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <QtGui>
#include "valgrind/callgrind.h"
class ItemMover : public QObject
{
Q_OBJECT
public:
ItemMover(QGraphicsItem *item)
: _item(item)
{
startTimer(0);
}
protected:
void timerEvent(QTimerEvent *event)
{
_item->moveBy(-1, 0);
}
private:
QGraphicsItem *_item;
};
class ClipItem : public QGraphicsRectItem
{
public:
ClipItem(qreal x, qreal y, qreal w, qreal h, const QPen &pen, const QBrush &brush)
: QGraphicsRectItem(x, y, w, h)
{
setPen(pen);
setBrush(brush);
}
QPainterPath shape() const
{
QPainterPath path;
path.addRect(rect());
return path;
}
};
class CountView : public QGraphicsView
{
protected:
void paintEvent(QPaintEvent *event)
{
static int n = 0;
if (n)
CALLGRIND_START_INSTRUMENTATION
QGraphicsView::paintEvent(event);
if (n)
CALLGRIND_STOP_INSTRUMENTATION
if (++n == 500)
qApp->quit();
}
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QGraphicsScene scene;
scene.setItemIndexMethod(QGraphicsScene::NoIndex);
ClipItem *clipItem = new ClipItem(0, 0, 100, 100, QPen(), QBrush(Qt::blue));
clipItem->setFlag(QGraphicsItem::ItemClipsChildrenToShape);
clipItem->setData(0, "clipItem");
scene.addItem(clipItem);
QGraphicsRectItem *scrollItem = scene.addRect(0, 0, 10, 10, QPen(Qt::NoPen), QBrush(Qt::NoBrush));
scrollItem->setParentItem(clipItem);
scrollItem->setFlag(QGraphicsItem::ItemIsMovable);
scrollItem->setData(0, "scrollItem");
for (int y = 0; y < 25; ++y) {
for (int x = 0; x < 25; ++x) {
ClipItem *rect = new ClipItem(0, 0, 90, 20, QPen(Qt::NoPen), QBrush(Qt::green));
rect->setParentItem(scrollItem);
rect->setPos(x * 95, y * 25);
rect->setData(0, qPrintable(QString("rect %1 %2").arg(x).arg(y)));
rect->setFlag(QGraphicsItem::ItemClipsChildrenToShape);
QGraphicsEllipseItem *ellipse = new QGraphicsEllipseItem(-5, -5, 10, 10);
ellipse->setPen(QPen(Qt::NoPen));
ellipse->setBrush(QBrush(Qt::yellow));
ellipse->setParentItem(rect);
ellipse->setData(0, qPrintable(QString("ellipse %1 %2").arg(x).arg(y)));
}
}
scrollItem->setRect(scrollItem->childrenBoundingRect());
#if 0
ItemMover mover(scrollItem);
#endif
CountView view;
view.setScene(&scene);
view.setSceneRect(-25, -25, 150, 150);
view.resize(300, 300);
view.show();
return app.exec();
}
#include "main.moc"
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