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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QApplication>
#include <QCommandLineParser>
#include <QQuickWidget>
#include <QQuickItem>
#include <QQmlError>
#include <QMdiArea>
#include <QLCDNumber>
#include <QFileDialog>
#include <QStatusBar>
#include <QMainWindow>
#include <QMenuBar>
#include <QPushButton>
class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow();
private slots:
void quickWidgetStatusChanged(QQuickWidget::Status);
void sceneGraphError(QQuickWindow::SceneGraphError error, const QString &message);
void grabFramebuffer();
void renderToPixmap();
void grabToImage();
void createQuickWidgetsInTabs(QMdiArea *mdiArea);
private:
QQuickWidget *m_quickWidget;
};
static bool optMultipleSample = false;
MainWindow::MainWindow()
: m_quickWidget(new QQuickWidget)
{
QSurfaceFormat format;
if (optMultipleSample)
format.setSamples(4);
m_quickWidget->setFormat(format);
QMdiArea *centralWidget = new QMdiArea;
QLCDNumber *lcd = new QLCDNumber;
lcd->display(1337);
lcd->setMinimumSize(250,100);
centralWidget->addSubWindow(lcd);
QUrl source("qrc:quickwidget/rotatingsquare.qml");
connect(m_quickWidget, &QQuickWidget::statusChanged,
this, &MainWindow::quickWidgetStatusChanged);
connect(m_quickWidget, &QQuickWidget::sceneGraphError,
this, &MainWindow::sceneGraphError);
m_quickWidget->resize(300,300);
m_quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView );
m_quickWidget->setSource(source);
centralWidget->addSubWindow(m_quickWidget);
setCentralWidget(centralWidget);
QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
auto grabAction = fileMenu->addAction(tr("Grab framebuffer"), this, &MainWindow::grabFramebuffer);
auto renderAction = fileMenu->addAction(tr("Render to pixmap"), this, &MainWindow::renderToPixmap);
auto grabToImageAction = fileMenu->addAction(tr("Grab via grabToImage"), this, &MainWindow::grabToImage);
fileMenu->addAction(tr("Quit"), qApp, &QCoreApplication::quit);
QMenu *windowMenu = menuBar()->addMenu(tr("&Window"));
windowMenu->addAction(tr("Add tab widget"), this,
[this, centralWidget] { createQuickWidgetsInTabs(centralWidget); });
connect(m_quickWidget, &QObject::destroyed, this,
[this, grabAction, renderAction, grabToImageAction] {
m_quickWidget = nullptr;
grabAction->setEnabled(false);
renderAction->setEnabled(false);
grabToImageAction->setEnabled(false);
});
}
void MainWindow::createQuickWidgetsInTabs(QMdiArea *mdiArea)
{
// A QQuickWidget should work like any other widget when it comes to being
// in layouts, in tab widgets, MDI areas, etc. It can also be freely
// reparented and made top-level.
QTabWidget *tabWidget = new QTabWidget;
const QSize size(400, 400);
const QString msgToTopLevel = QLatin1String("Break out to top-level window");
const QString msgFromTopLevel = QLatin1String("Move back under tab widget");
static const int N = 4;
static const QColor colorTab[N] = { Qt::green, Qt::blue, Qt::yellow, Qt::magenta };
for (int i = 0; i < N; ++i) {
QQuickWidget *widget = new QQuickWidget;
widget->resize(size);
widget->setResizeMode(QQuickWidget::SizeRootObjectToView);
QObject::connect(widget, &QQuickWidget::statusChanged, widget, [widget, i] {
if (widget->status() == QQuickWidget::Ready) {
if (QQuickItem *rootItem = widget->rootObject()) {
rootItem->setProperty("rectColor", colorTab[i]);
}
}
});
widget->setSource(QUrl("qrc:quickwidget/rotatingsquare.qml"));
widget->setWindowTitle(QString::asprintf("Tab %d", i + 1));
QPushButton *btn = new QPushButton(msgToTopLevel, widget);
connect(btn, &QPushButton::clicked, widget, [=] {
if (widget->parent()) {
widget->setAttribute(Qt::WA_DeleteOnClose, true);
widget->setParent(nullptr);
connect(this, &QObject::destroyed, widget, &QWidget::close);
widget->show();
btn->setText(msgFromTopLevel);
} else {
widget->setAttribute(Qt::WA_DeleteOnClose, false);
disconnect(this, &QObject::destroyed, widget, &QWidget::close);
tabWidget->addTab(widget, widget->windowTitle());
btn->setText(msgToTopLevel);
}
});
tabWidget->addTab(widget, QString::asprintf("Tab %d", i + 1));
}
mdiArea->addSubWindow(tabWidget);
tabWidget->show();
}
void MainWindow::quickWidgetStatusChanged(QQuickWidget::Status status)
{
if (status == QQuickWidget::Error) {
QStringList errors;
Q_ASSERT(m_quickWidget);
const auto widgetErrors = m_quickWidget->errors();
for (const QQmlError &error : widgetErrors)
errors.append(error.toString());
statusBar()->showMessage(errors.join(QStringLiteral(", ")));
}
}
void MainWindow::sceneGraphError(QQuickWindow::SceneGraphError, const QString &message)
{
statusBar()->showMessage(message);
}
template<class T> void saveToFile(QWidget *parent, T *saveable)
{
QFileDialog fd(parent);
fd.setAcceptMode(QFileDialog::AcceptSave);
fd.setDefaultSuffix("png");
fd.selectFile("test.png");
if (fd.exec() == QDialog::Accepted)
saveable->save(fd.selectedFiles().first());
}
void MainWindow::grabFramebuffer()
{
Q_ASSERT(m_quickWidget);
QImage image = m_quickWidget->grabFramebuffer();
saveToFile(this, &image);
}
void MainWindow::renderToPixmap()
{
Q_ASSERT(m_quickWidget);
QPixmap pixmap(m_quickWidget->size());
m_quickWidget->render(&pixmap);
saveToFile(this, &pixmap);
}
void MainWindow::grabToImage()
{
QFileDialog fd(this);
fd.setAcceptMode(QFileDialog::AcceptSave);
fd.setDefaultSuffix("png");
fd.selectFile("test_grabToImage.png");
if (fd.exec() == QDialog::Accepted) {
Q_ASSERT(m_quickWidget);
QMetaObject::invokeMethod(m_quickWidget->rootObject(), "performLayerBasedGrab",
Q_ARG(QVariant, fd.selectedFiles().first()));
}
}
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QCoreApplication::setApplicationName("Qt QQuickWidget Example");
QCoreApplication::setOrganizationName("QtProject");
QCoreApplication::setApplicationVersion(QT_VERSION_STR);
QCommandLineParser parser;
parser.setApplicationDescription(QCoreApplication::applicationName());
parser.addHelpOption();
parser.addVersionOption();
QCommandLineOption multipleSampleOption("multisample", "Multisampling");
parser.addOption(multipleSampleOption);
parser.process(app);
optMultipleSample = parser.isSet(multipleSampleOption);
MainWindow *mainWindow = new MainWindow;
mainWindow->setAttribute(Qt::WA_DeleteOnClose, true);
mainWindow->show();
return app.exec();
}
#include "main.moc"
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