Revision control
++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QApplication>
++ #include <QVBoxLayout>
++ #include <QHBoxLayout>
++ #include <QSlider>
++ #include <QTextEdit>
++ #include <QPushButton>
++ #include <QLabel>
++ #include <QCheckBox>
++ #include <QFileDialog>
++ #include <QFontInfo>
++ #include <QMouseEvent>
++ #include <QDrag>
++ #include <QMimeData>
++ #include "examplewidget.h"
++
++ int main(int argc, char **argv)
++ {
++ QApplication app(argc, argv);
++
++ QVBoxLayout *layout = new QVBoxLayout;
++
++ ExampleRhiWidget *rhiWidget = new ExampleRhiWidget;
++ QLabel *overlayLabel = new QLabel(rhiWidget);
++ overlayLabel->setText(QObject::tr("This is a\nsemi-transparent\n overlay widget\n"
++ "placed on top of\nthe QRhiWidget."));
++ overlayLabel->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
++ overlayLabel->setAutoFillBackground(true);
++ QPalette semiTransparent(QColor(255, 0, 0, 64));
++ semiTransparent.setBrush(QPalette::Text, Qt::white);
++ semiTransparent.setBrush(QPalette::WindowText, Qt::white);
++ overlayLabel->setPalette(semiTransparent);
++ QFont f = overlayLabel->font();
++ f.setPixelSize(QFontInfo(f).pixelSize() * 2);
++ f.setWeight(QFont::Bold);
++ overlayLabel->setFont(f);
++ overlayLabel->resize(320, 320);
++ overlayLabel->hide();
++ QObject::connect(rhiWidget, &ExampleRhiWidget::resized, rhiWidget, [rhiWidget, overlayLabel] {
++ const int w = overlayLabel->width();
++ const int h = overlayLabel->height();
++ overlayLabel->setGeometry(rhiWidget->width() / 2 - w / 2, rhiWidget->height() / 2 - h / 2, w, h);
++ });
++
++ QTextEdit *edit = new QTextEdit(QObject::tr("QRhiWidget!<br><br>"
++ "The cube is textured with QPainter-generated content.<br><br>"
++ "Regular, non-native widgets on top work just fine."));
++ QObject::connect(edit, &QTextEdit::textChanged, edit, [edit, rhiWidget] {
++ rhiWidget->setCubeTextureText(edit->toPlainText());
++ });
++ edit->setMaximumHeight(100);
++ layout->addWidget(edit);
++
++ QSlider *slider = new QSlider(Qt::Horizontal);
++ slider->setMinimum(0);
++ slider->setMaximum(360);
++ QObject::connect(slider, &QSlider::valueChanged, slider, [slider, rhiWidget] {
++ rhiWidget->setCubeRotation(slider->value());
++ });
++
++ QHBoxLayout *sliderLayout = new QHBoxLayout;
++ sliderLayout->addWidget(new QLabel(QObject::tr("Cube rotation")));
++ sliderLayout->addWidget(slider);
++ layout->addLayout(sliderLayout);
++
++ QHBoxLayout *btnLayout = new QHBoxLayout;
++
++ QLabel *apiLabel = new QLabel;
++ btnLayout->addWidget(apiLabel);
++ QObject::connect(rhiWidget, &ExampleRhiWidget::rhiChanged, rhiWidget, [apiLabel](const QString &apiName) {
++ apiLabel->setText(QObject::tr("Using QRhi on ") + apiName);
++ });
++
++ QPushButton *btnMakeWindow = new QPushButton(QObject::tr("Make top-level window"));
++ QObject::connect(btnMakeWindow, &QPushButton::clicked, btnMakeWindow, [rhiWidget, btnMakeWindow, layout] {
++ if (rhiWidget->parentWidget()) {
++ rhiWidget->setParent(nullptr);
++ rhiWidget->setAttribute(Qt::WA_DeleteOnClose, true);
++ rhiWidget->show();
++ btnMakeWindow->setText(QObject::tr("Make child widget"));
++ } else {
++ rhiWidget->setAttribute(Qt::WA_DeleteOnClose, false);
++ layout->addWidget(rhiWidget);
++ btnMakeWindow->setText(QObject::tr("Make top-level window"));
++ }
++ });
++ btnLayout->addWidget(btnMakeWindow);
++
++ QPushButton *btn = new QPushButton(QObject::tr("Grab to image"));
++ QObject::connect(btn, &QPushButton::clicked, btn, [rhiWidget] {
++ QImage image = rhiWidget->grabFramebuffer();
++ qDebug() << "Got image" << image;
++ if (!image.isNull()) {
++ QFileDialog fd(rhiWidget->parentWidget());
++ fd.setAcceptMode(QFileDialog::AcceptSave);
++ fd.setDefaultSuffix("png");
++ fd.selectFile("test.png");
++ if (fd.exec() == QDialog::Accepted)
++ image.save(fd.selectedFiles().first());
++ }
++ });
++ btnLayout->addWidget(btn);
++
++ QCheckBox *cbMsaa = new QCheckBox(QObject::tr("Use 4x MSAA"));
++ QObject::connect(cbMsaa, &QCheckBox::checkStateChanged, cbMsaa, [cbMsaa, rhiWidget] {
++ if (cbMsaa->isChecked())
++ rhiWidget->setSampleCount(4);
++ else
++ rhiWidget->setSampleCount(1);
++ });
++ btnLayout->addWidget(cbMsaa);
++
++ QCheckBox *cbOvberlay = new QCheckBox(QObject::tr("Show overlay widget"));
++ QObject::connect(cbOvberlay, &QCheckBox::checkStateChanged, cbOvberlay, [cbOvberlay, overlayLabel] {
++ if (cbOvberlay->isChecked())
++ overlayLabel->setVisible(true);
++ else
++ overlayLabel->setVisible(false);
++ });
++ btnLayout->addWidget(cbOvberlay);
++
++ QCheckBox *cbFlip = new QCheckBox(QObject::tr("Flip"));
++ QObject::connect(cbFlip, &QCheckBox::checkStateChanged, cbOvberlay, [cbFlip, rhiWidget] {
++ rhiWidget->setMirrorVertically(cbFlip->isChecked());
++ });
++ btnLayout->addWidget(cbFlip);
++
++ QCheckBox *cbFixedSize = new QCheckBox(QObject::tr("Use fixed color buffer size"));
++ btnLayout->addWidget(cbFixedSize);
++ QSlider *fixedSizeSlider = new QSlider(Qt::Horizontal);
++ fixedSizeSlider->setMinimum(16);
++ fixedSizeSlider->setMaximum(512);
++ btnLayout->addWidget(fixedSizeSlider);
++
++ QObject::connect(cbFixedSize, &QCheckBox::checkStateChanged, cbFixedSize, [cbFixedSize, fixedSizeSlider, rhiWidget] {
++ if (cbFixedSize->isChecked())
++ rhiWidget->setFixedColorBufferSize(QSize(fixedSizeSlider->value(), fixedSizeSlider->value()));
++ else
++ rhiWidget->setFixedColorBufferSize(QSize());
++ });
++ QObject::connect(fixedSizeSlider, &QSlider::valueChanged, fixedSizeSlider, [fixedSizeSlider, cbFixedSize, rhiWidget] {
++ if (cbFixedSize->isChecked())
++ rhiWidget->setFixedColorBufferSize(QSize(fixedSizeSlider->value(), fixedSizeSlider->value()));
++ });
++
++ // Exit when the detached window is closed; there is not much we can do
++ // with the controls in the main window then.
++ QObject::connect(rhiWidget, &QObject::destroyed, rhiWidget, [rhiWidget] {
++ if (!rhiWidget->parentWidget())
++ qGuiApp->quit();
++ });
++
++ layout->addLayout(btnLayout);
++ layout->addWidget(rhiWidget);
++
++ rhiWidget->setCubeTextureText(edit->toPlainText());
++
++ QWidget w;
++ w.setLayout(layout);
++ w.resize(1280, 720);
++ w.show();
++
++ return app.exec();
++ }