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# Code for Screenshot Example

    /****************************************************************************
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     **  (C) 1992-2008 Trolltech ASA. All rights reserved.
     **
     ** This file is part of Qt Jambi.
     **
     ** ** 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
    ** General Public Licensing requirements will be met:
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    ** review the following information:
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     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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    package com.trolltech.examples;

    import com.trolltech.qt.core.*;
    import com.trolltech.qt.core.Qt.*;
    import com.trolltech.qt.gui.*;
    import com.trolltech.qt.gui.QSizePolicy.Policy;

    @QtJambiExample(name = "Screenshot")
    public class Screenshot extends QWidget {

        public static void main(String args[]) {
            QApplication.initialize(args);
            Screenshot screenshot = new Screenshot(null);
            screenshot.show();
            QApplication.exec();
        }

        volatile QPixmap originalPixmap;

        QLabel screenshotLabel;
        QGroupBox optionsGroupBox;
        QSpinBox delaySpinBox;
        QLabel delaySpinBoxLabel;
        QCheckBox hideThisWindowCheckBox;
        QPushButton newScreenshotButton;
        QPushButton saveScreenshotButton;
        QPushButton quitScreenshotButton;

        QVBoxLayout mainLayout;
        QGridLayout optionsGroupBoxLayout;
        QHBoxLayout buttonsLayout;

        public Screenshot(QWidget parent) {
            super(parent);
            screenshotLabel = new QLabel();
            screenshotLabel.setSizePolicy(Policy.Expanding, Policy.Expanding);
            screenshotLabel.setAlignment(AlignmentFlag.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);

            setWindowIcon(new QIcon("classpath:com/trolltech/images/qt-logo.png"));
            setWindowTitle(tr("Screenshot"));
            resize(300, 200);
        }

        @Override
        public void resizeEvent(QResizeEvent event) {
            QSize scaledSize = originalPixmap.size();
            scaledSize.scale(screenshotLabel.size(),
                             AspectRatioMode.KeepAspectRatio);
            if (screenshotLabel.pixmap() != null
                || scaledSize != screenshotLabel.pixmap().size())
                    updateScreenshotLabel();
        }

        void newScreenshot() {
            if (hideThisWindowCheckBox.isChecked())
                hide();
            newScreenshotButton.setDisabled(true);

            QTimer.singleShot(delaySpinBox.value() * 1000,
                              this, "shootScreen()");
        }

        void saveScreenshot() {
            String format = "png";
            String initialPath = QDir.currentPath() + tr("/untitled.") + format;
            String filter = String.format(tr("%1$s Files (*.%2$s);;All Files (*)"),
                                          format.toUpperCase(), format);
            String fileName;
            fileName = QFileDialog.getSaveFileName(this, tr("Save As"), initialPath,
                                                   new QFileDialog.Filter(filter));

            if (!fileName.equals(""))
                originalPixmap.save(fileName, format);
        }

        void shootScreen() {
            if (delaySpinBox.value() != 0)
                QApplication.beep();

            originalPixmap = null;

            originalPixmap = QPixmap.grabWindow(
                    QApplication.desktop().winId());
            updateScreenshotLabel();

            newScreenshotButton.setDisabled(false);
            if (hideThisWindowCheckBox.isChecked())
                show();
        }

        void updateCheckBox() {
            if (delaySpinBox.value() == 0)
                hideThisWindowCheckBox.setDisabled(true);
            else
                hideThisWindowCheckBox.setDisabled(false);
        }

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

            delaySpinBox = new QSpinBox();
            delaySpinBox.setSuffix(tr(" s"));
            delaySpinBox.setMaximum(60);
            delaySpinBox.valueChanged.connect(this, "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 createButtonsLayout() {
            newScreenshotButton = createButton(tr("New Screenshot"), this,
                                               "newScreenshot()");

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

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

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

        QPushButton createButton(final String text, QWidget receiver,
                                 String member) {
            QPushButton button = new QPushButton(text);
            button.clicked.connect(receiver, member);
            return button;
        }

        void updateScreenshotLabel() {
            screenshotLabel.setPixmap(originalPixmap.scaled(screenshotLabel.size(),
                                      AspectRatioMode.KeepAspectRatio,
                                      TransformationMode.SmoothTransformation));
        }
    }