graphicsview.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QtPrintSupport/qtprintsupportglobal.h>
 
#include <QtPrintSupport/qabstractprintdialog.h>
 
#if QT_CONFIG(printdialog)
 
#include <QStandardItem>
#include <QtCore/qmimedata.h>
#include <QtGui/qdrag.h>
#include <QtOpenGLWidgets/qopenglwidget.h>
#include <QtPrintSupport/qprintdialog.h>
#include <QtPrintSupport/qprinter.h>
#include <QtWidgets/QGraphicsSceneMouseEvent>
#include <QtWidgets/qdialog.h>
#include <QtWidgets/qgraphicsview.h>
 
void graphicsview_snippet_main()
{
    //! [0]
    QGraphicsScene scene;
    QGraphicsRectItem *rect = scene.addRect(QRectF(0, 0, 100, 100));
 
    QGraphicsItem *item = scene.itemAt(50, 50, QTransform());
    //! [0]
    Q_UNUSED(rect);
    Q_UNUSED(item);
}
 
void myPopulateScene(QGraphicsScene *)
{
    // Intentionally left empty
}
 
void snippetThatUsesMyPopulateScene()
{
    //! [1]
    QGraphicsScene scene;
    myPopulateScene(&scene);
    QGraphicsView view(&scene);
    view.show();
    //! [1]
}
 
class CustomItem : public QStandardItem
{
public:
    using QStandardItem::QStandardItem;
 
    int type() const override { return UserType; }
    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    QStandardItem *clone() const override { return new CustomItem; }
};
 
 
void printScene()
{
    //! [3]
    QGraphicsScene scene;
    QPrinter printer;
    scene.addRect(QRectF(0, 0, 100, 200), QPen(Qt::black), QBrush(Qt::green));
 
    if (QPrintDialog(&printer).exec() == QDialog::Accepted) {
        QPainter painter(&printer);
        painter.setRenderHint(QPainter::Antialiasing);
        scene.render(&painter);
    }
    //! [3]
}
 
void pixmapScene()
{
    //! [4]
    QGraphicsScene scene;
    scene.addRect(QRectF(0, 0, 100, 200), QPen(Qt::black), QBrush(Qt::green));
 
    QPixmap pixmap;
    QPainter painter(&pixmap);
    painter.setRenderHint(QPainter::Antialiasing);
    scene.render(&painter);
    painter.end();
 
    pixmap.save("scene.png");
    //! [4]
}
 
//! [5]
void CustomItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    QMimeData *data = new QMimeData;
    QDrag *drag = new QDrag(event->widget());
    drag->setMimeData(data);
    drag->exec();
}
//! [5]
 
void viewScene()
{
    QGraphicsScene scene;
    //! [6]
    QGraphicsView view(&scene);
    QOpenGLWidget *gl = new QOpenGLWidget();
    QSurfaceFormat format;
    format.setSamples(4);
    gl->setFormat(format);
    view.setViewport(gl);
    //! [6]
}
 
#endif // QT_CONFIG(printdialog)