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** This file is part of the examples of the Qt Toolkit.

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#include <QtGui>

#include "screenshot.h"

//! [0]

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);

}

//! [0]

//! [1]

void Screenshot::resizeEvent(QResizeEvent * /* event */)

{

    QSize scaledSize = originalPixmap.size();

    scaledSize.scale(screenshotLabel->size(), Qt::KeepAspectRatio);

    if (!screenshotLabel->pixmap()

            || scaledSize != screenshotLabel->pixmap()->size())

        updateScreenshotLabel();

}

//! [1]

//! [2]

void Screenshot::newScreenshot()

{

    if (hideThisWindowCheckBox->isChecked())

        hide();

    newScreenshotButton->setDisabled(true);

    QTimer::singleShot(delaySpinBox->value() * 1000, this, SLOT(shootScreen()));

}

//! [2]

//! [3]

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());

}

//! [3]

//! [4]

void Screenshot::shootScreen()

{

    if (delaySpinBox->value() != 0)

        qApp->beep();

//! [4]

    originalPixmap = QPixmap(); // clear image for low memory situations

                                // on embedded devices.

//! [5]

    originalPixmap = QPixmap::grabWindow(QApplication::desktop()->winId());

    updateScreenshotLabel();

    newScreenshotButton->setDisabled(false);

    if (hideThisWindowCheckBox->isChecked())

        show();

}

//! [5]

//! [6]

void Screenshot::updateCheckBox()

{

    if (delaySpinBox->value() == 0) {

        hideThisWindowCheckBox->setDisabled(true);

        hideThisWindowCheckBox->setChecked(false);

    }

    else

        hideThisWindowCheckBox->setDisabled(false);

}

//! [6]

//! [7]

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);

}

//! [7]

//! [8]

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);

}

//! [8]

//! [9]

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;

}

//! [9]

//! [10]

void Screenshot::updateScreenshotLabel()

{

    screenshotLabel->setPixmap(originalPixmap.scaled(screenshotLabel->size(),

                                                     Qt::KeepAspectRatio,

                                                     Qt::SmoothTransformation));

}

//! [10]