Qt 4.0: screenshot.cpp Example File (widgets/screenshot/screenshot.cpp)

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# screenshot.cpp Example File
widgets/screenshot/screenshot.cpp

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        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
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        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        ****************************************************************************/

        #include <QtGui>

        #include "screenshot.h"

        Screenshot::Screenshot()
        {
            screenshotLabel = new QLabel;
            screenshotLabel->setSizePolicy(QSizePolicy::Expanding,
                                           QSizePolicy::Expanding);
            screenshotLabel->setAlignment(Qt::AlignCenter);
            screenshotLabel->setMinimumSize(240, 160);

            createOptionsGroupBox();
            createButtonsLayout();

            mainLayout = new QVBoxLayout;
            mainLayout->addWidget(screenshotLabel);
            mainLayout->addWidget(optionsGroupBox);
            mainLayout->addLayout(buttonsLayout);
            setLayout(mainLayout);

            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, SLOT(shootScreen()));
        }

        void Screenshot::saveScreenshot()
        {
            QString format = "png";
            QString initialPath = QDir::currentPath() + tr("/untitled.") + format;

            QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
                                       initialPath,
                                       tr("%1 Files (*.%2);;All Files (*)")
                                       .arg(format.toUpper())
                                       .arg(format));
            if (!fileName.isEmpty())
                originalPixmap.save(fileName, format.toAscii());
        }

        void Screenshot::shootScreen()
        {
            if (delaySpinBox->value() != 0)
                qApp->beep();
            originalPixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
            updateScreenshotLabel();

            newScreenshotButton->setDisabled(false);
            if (hideThisWindowCheckBox->isChecked())
                show();
        }

        void Screenshot::updateCheckBox()
        {
            if (delaySpinBox->value() == 0)
                hideThisWindowCheckBox->setDisabled(true);
            else
                hideThisWindowCheckBox->setDisabled(false);
        }

        void Screenshot::createOptionsGroupBox()
        {
            optionsGroupBox = new QGroupBox(tr("Options"));

            delaySpinBox = new QSpinBox;
            delaySpinBox->setSuffix(tr(" s"));
            delaySpinBox->setMaximum(60);
            connect(delaySpinBox, SIGNAL(valueChanged(int)), this, SLOT(updateCheckBox()));

            delaySpinBoxLabel = new QLabel(tr("Screenshot Delay:"));

            hideThisWindowCheckBox = new QCheckBox(tr("Hide This Window"));

            optionsGroupBoxLayout = new QGridLayout;
            optionsGroupBoxLayout->addWidget(delaySpinBoxLabel, 0, 0);
            optionsGroupBoxLayout->addWidget(delaySpinBox, 0, 1);
            optionsGroupBoxLayout->addWidget(hideThisWindowCheckBox, 1, 0, 1, 2);
            optionsGroupBox->setLayout(optionsGroupBoxLayout);
        }

        void Screenshot::createButtonsLayout()
        {
            newScreenshotButton = createButton(tr("New Screenshot"),
                                               this, SLOT(newScreenshot()));

            saveScreenshotButton = createButton(tr("Save Screenshot"),
                                                this, SLOT(saveScreenshot()));

            quitScreenshotButton = createButton(tr("Quit"), this, SLOT(close()));

            buttonsLayout = new QHBoxLayout;
            buttonsLayout->addStretch();
            buttonsLayout->addWidget(newScreenshotButton);
            buttonsLayout->addWidget(saveScreenshotButton);
            buttonsLayout->addWidget(quitScreenshotButton);
        }

        QPushButton *Screenshot::createButton(const QString &text, QWidget *receiver,
                                              const char *member)
        {
            QPushButton *button = new QPushButton(text);
            button->connect(button, SIGNAL(clicked()), receiver, member);
            return button;
        }

        void Screenshot::updateScreenshotLabel()
        {
            screenshotLabel->setPixmap(originalPixmap.scaled(screenshotLabel->size(),
                                                             Qt::KeepAspectRatio,
                                                             Qt::SmoothTransformation));
        }