screenshot.cpp Example File

desktop/screenshot/screenshot.cpp
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#include <QtWidgets> #include "screenshot.h" Screenshot::Screenshot() : screenshotLabel(new QLabel(this)) { screenshotLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); screenshotLabel->setAlignment(Qt::AlignCenter); const QRect screenGeometry = QApplication::desktop()->screenGeometry(this); screenshotLabel->setMinimumSize(screenGeometry.width() / 8, screenGeometry.height() / 8); QVBoxLayout *mainLayout = new QVBoxLayout(this); mainLayout->addWidget(screenshotLabel); QGroupBox *optionsGroupBox = new QGroupBox(tr("Options"), this); delaySpinBox = new QSpinBox(optionsGroupBox); delaySpinBox->setSuffix(tr(" s")); delaySpinBox->setMaximum(60); connect(delaySpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &Screenshot::updateCheckBox); hideThisWindowCheckBox = new QCheckBox(tr("Hide This Window"), optionsGroupBox); QGridLayout *optionsGroupBoxLayout = new QGridLayout(optionsGroupBox); optionsGroupBoxLayout->addWidget(new QLabel(tr("Screenshot Delay:"), this), 0, 0); optionsGroupBoxLayout->addWidget(delaySpinBox, 0, 1); optionsGroupBoxLayout->addWidget(hideThisWindowCheckBox, 1, 0, 1, 2); mainLayout->addWidget(optionsGroupBox); QHBoxLayout *buttonsLayout = new QHBoxLayout; newScreenshotButton = new QPushButton(tr("New Screenshot"), this); connect(newScreenshotButton, &QPushButton::clicked, this, &Screenshot::newScreenshot); buttonsLayout->addWidget(newScreenshotButton); QPushButton *saveScreenshotButton = new QPushButton(tr("Save Screenshot"), this); connect(saveScreenshotButton, &QPushButton::clicked, this, &Screenshot::saveScreenshot); buttonsLayout->addWidget(saveScreenshotButton); QPushButton *quitScreenshotButton = new QPushButton(tr("Quit"), this); quitScreenshotButton->setShortcut(Qt::CTRL + Qt::Key_Q); connect(quitScreenshotButton, &QPushButton::clicked, this, &QWidget::close); buttonsLayout->addWidget(quitScreenshotButton); buttonsLayout->addStretch(); mainLayout->addLayout(buttonsLayout); shootScreen(); delaySpinBox->setValue(5); setWindowTitle(tr("Screenshot")); resize(300, 200); } void Screenshot::resizeEvent(QResizeEvent * /* event */) { QSize scaledSize = originalPixmap.size(); scaledSize.scale(screenshotLabel->size(), Qt::KeepAspectRatio); if (!screenshotLabel->pixmap() || scaledSize != screenshotLabel->pixmap()->size()) updateScreenshotLabel(); } void Screenshot::newScreenshot() { if (hideThisWindowCheckBox->isChecked()) hide(); newScreenshotButton->setDisabled(true); QTimer::singleShot(delaySpinBox->value() * 1000, this, &Screenshot::shootScreen); } void Screenshot::saveScreenshot() { const QString format = "png"; QString initialPath = QStandardPaths::writableLocation(QStandardPaths::PicturesLocation); if (initialPath.isEmpty()) initialPath = QDir::currentPath(); initialPath += tr("/untitled.") + format; QFileDialog fileDialog(this, tr("Save As"), initialPath); fileDialog.setAcceptMode(QFileDialog::AcceptSave); fileDialog.setFileMode(QFileDialog::AnyFile); fileDialog.setDirectory(initialPath); QStringList mimeTypes; foreach (const QByteArray &bf, QImageWriter::supportedMimeTypes()) mimeTypes.append(QLatin1String(bf)); fileDialog.setMimeTypeFilters(mimeTypes); fileDialog.selectMimeTypeFilter("image/" + format); fileDialog.setDefaultSuffix(format); if (fileDialog.exec() != QDialog::Accepted) return; const QString fileName = fileDialog.selectedFiles().first(); if (!originalPixmap.save(fileName)) { QMessageBox::warning(this, tr("Save Error"), tr("The image could not be saved to \"%1\".") .arg(QDir::toNativeSeparators(fileName))); } } void Screenshot::shootScreen() { QScreen *screen = QGuiApplication::primaryScreen(); if (const QWindow *window = windowHandle()) screen = window->screen(); if (!screen) return; if (delaySpinBox->value() != 0) QApplication::beep(); originalPixmap = screen->grabWindow(0); updateScreenshotLabel(); newScreenshotButton->setDisabled(false); if (hideThisWindowCheckBox->isChecked()) show(); } void Screenshot::updateCheckBox() { if (delaySpinBox->value() == 0) { hideThisWindowCheckBox->setDisabled(true); hideThisWindowCheckBox->setChecked(false); } else { hideThisWindowCheckBox->setDisabled(false); } } void Screenshot::updateScreenshotLabel() { screenshotLabel->setPixmap(originalPixmap.scaled(screenshotLabel->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation)); }