1 files changed, 364 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/widgets/imageviewer/imageviewer.cpp b/tests/manual/examples/widgets/widgets/imageviewer/imageviewer.cpp
new file mode 100644
index 0000000000..72a93dbf1b
--- /dev/null
+++ b/tests/manual/examples/widgets/widgets/imageviewer/imageviewer.cpp
@@ -0,0 +1,364 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "imageviewer.h"
+
+#include <QApplication>
+#include <QClipboard>
+#include <QColorSpace>
+#include <QDir>
+#include <QFileDialog>
+#include <QImageReader>
+#include <QImageWriter>
+#include <QLabel>
+#include <QMenuBar>
+#include <QMessageBox>
+#include <QMimeData>
+#include <QPainter>
+#include <QScreen>
+#include <QScrollArea>
+#include <QScrollBar>
+#include <QStandardPaths>
+#include <QStatusBar>
+
+#if defined(QT_PRINTSUPPORT_LIB)
+#  include <QtPrintSupport/qtprintsupportglobal.h>
+
+#  if QT_CONFIG(printdialog)
+#    include <QPrintDialog>
+#  endif
+#endif
+
+//! [0]
+ImageViewer::ImageViewer(QWidget *parent)
+   : QMainWindow(parent), imageLabel(new QLabel)
+   , scrollArea(new QScrollArea)
+{
+    imageLabel->setBackgroundRole(QPalette::Base);
+    imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
+    imageLabel->setScaledContents(true);
+
+    scrollArea->setBackgroundRole(QPalette::Dark);
+    scrollArea->setWidget(imageLabel);
+    scrollArea->setVisible(false);
+    setCentralWidget(scrollArea);
+
+    createActions();
+
+    resize(QGuiApplication::primaryScreen()->availableSize() * 3 / 5);
+}
+
+//! [0]
+//! [2]
+
+bool ImageViewer::loadFile(const QString &fileName)
+{
+    QImageReader reader(fileName);
+    reader.setAutoTransform(true);
+    const QImage newImage = reader.read();
+    if (newImage.isNull()) {
+        QMessageBox::information(this, QGuiApplication::applicationDisplayName(),
+                                 tr("Cannot load %1: %2")
+                                 .arg(QDir::toNativeSeparators(fileName), reader.errorString()));
+        return false;
+    }
+//! [2]
+
+    setImage(newImage);
+
+    setWindowFilePath(fileName);
+
+    const QString description = image.colorSpace().isValid()
+        ? image.colorSpace().description() : tr("unknown");
+    const QString message = tr("Opened \"%1\", %2x%3, Depth: %4 (%5)")
+        .arg(QDir::toNativeSeparators(fileName)).arg(image.width()).arg(image.height())
+        .arg(image.depth()).arg(description);
+    statusBar()->showMessage(message);
+    return true;
+}
+
+void ImageViewer::setImage(const QImage &newImage)
+{
+    if (newImage.colorSpace().isValid())
+        image = newImage.convertedToColorSpace(QColorSpace::SRgb);
+    else
+        image = newImage;
+    imageLabel->setPixmap(QPixmap::fromImage(image, Qt::NoFormatConversion));
+//! [4]
+    scaleFactor = 1.0;
+
+    scrollArea->setVisible(true);
+    printAct->setEnabled(true);
+    fitToWindowAct->setEnabled(true);
+    updateActions();
+
+    if (!fitToWindowAct->isChecked())
+        imageLabel->adjustSize();
+}
+
+//! [4]
+
+bool ImageViewer::saveFile(const QString &fileName)
+{
+    QImageWriter writer(fileName);
+
+    if (!writer.write(image)) {
+        QMessageBox::information(this, QGuiApplication::applicationDisplayName(),
+                                 tr("Cannot write %1: %2")
+                                 .arg(QDir::toNativeSeparators(fileName), writer.errorString()));
+        return false;
+    }
+    const QString message = tr("Wrote \"%1\"").arg(QDir::toNativeSeparators(fileName));
+    statusBar()->showMessage(message);
+    return true;
+}
+
+//! [1]
+
+static void initializeImageFileDialog(QFileDialog &dialog, QFileDialog::AcceptMode acceptMode)
+{
+    static bool firstDialog = true;
+
+    if (firstDialog) {
+        firstDialog = false;
+        const QStringList picturesLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
+        dialog.setDirectory(picturesLocations.isEmpty() ? QDir::currentPath() : picturesLocations.last());
+    }
+
+    QStringList mimeTypeFilters;
+    const QByteArrayList supportedMimeTypes = acceptMode == QFileDialog::AcceptOpen
+        ? QImageReader::supportedMimeTypes() : QImageWriter::supportedMimeTypes();
+    for (const QByteArray &mimeTypeName : supportedMimeTypes)
+        mimeTypeFilters.append(mimeTypeName);
+    mimeTypeFilters.sort();
+    dialog.setMimeTypeFilters(mimeTypeFilters);
+    dialog.selectMimeTypeFilter("image/jpeg");
+    dialog.setAcceptMode(acceptMode);
+    if (acceptMode == QFileDialog::AcceptSave)
+        dialog.setDefaultSuffix("jpg");
+}
+
+void ImageViewer::open()
+{
+    QFileDialog dialog(this, tr("Open File"));
+    initializeImageFileDialog(dialog, QFileDialog::AcceptOpen);
+
+    while (dialog.exec() == QDialog::Accepted && !loadFile(dialog.selectedFiles().constFirst())) {}
+}
+//! [1]
+
+void ImageViewer::saveAs()
+{
+    QFileDialog dialog(this, tr("Save File As"));
+    initializeImageFileDialog(dialog, QFileDialog::AcceptSave);
+
+    while (dialog.exec() == QDialog::Accepted && !saveFile(dialog.selectedFiles().constFirst())) {}
+}
+
+//! [5]
+void ImageViewer::print()
+//! [5] //! [6]
+{
+    Q_ASSERT(!imageLabel->pixmap().isNull());
+#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
+//! [6] //! [7]
+    QPrintDialog dialog(&printer, this);
+//! [7] //! [8]
+    if (dialog.exec()) {
+        QPainter painter(&printer);
+        QPixmap pixmap = imageLabel->pixmap();
+        QRect rect = painter.viewport();
+        QSize size = pixmap.size();
+        size.scale(rect.size(), Qt::KeepAspectRatio);
+        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
+        painter.setWindow(pixmap.rect());
+        painter.drawPixmap(0, 0, pixmap);
+    }
+#endif
+}
+//! [8]
+
+void ImageViewer::copy()
+{
+#ifndef QT_NO_CLIPBOARD
+    QGuiApplication::clipboard()->setImage(image);
+#endif // !QT_NO_CLIPBOARD
+}
+
+#ifndef QT_NO_CLIPBOARD
+static QImage clipboardImage()
+{
+    if (const QMimeData *mimeData = QGuiApplication::clipboard()->mimeData()) {
+        if (mimeData->hasImage()) {
+            const QImage image = qvariant_cast<QImage>(mimeData->imageData());
+            if (!image.isNull())
+                return image;
+        }
+    }
+    return QImage();
+}
+#endif // !QT_NO_CLIPBOARD
+
+void ImageViewer::paste()
+{
+#ifndef QT_NO_CLIPBOARD
+    const QImage newImage = clipboardImage();
+    if (newImage.isNull()) {
+        statusBar()->showMessage(tr("No image in clipboard"));
+    } else {
+        setImage(newImage);
+        setWindowFilePath(QString());
+        const QString message = tr("Obtained image from clipboard, %1x%2, Depth: %3")
+            .arg(newImage.width()).arg(newImage.height()).arg(newImage.depth());
+        statusBar()->showMessage(message);
+    }
+#endif // !QT_NO_CLIPBOARD
+}
+
+//! [9]
+void ImageViewer::zoomIn()
+//! [9] //! [10]
+{
+    scaleImage(1.25);
+}
+
+void ImageViewer::zoomOut()
+{
+    scaleImage(0.8);
+}
+
+//! [10] //! [11]
+void ImageViewer::normalSize()
+//! [11] //! [12]
+{
+    imageLabel->adjustSize();
+    scaleFactor = 1.0;
+}
+//! [12]
+
+//! [13]
+void ImageViewer::fitToWindow()
+//! [13] //! [14]
+{
+    bool fitToWindow = fitToWindowAct->isChecked();
+    scrollArea->setWidgetResizable(fitToWindow);
+    if (!fitToWindow)
+        normalSize();
+    updateActions();
+}
+//! [14]
+
+
+//! [15]
+void ImageViewer::about()
+//! [15] //! [16]
+{
+    QMessageBox::about(this, tr("About Image Viewer"),
+            tr("<p>The <b>Image Viewer</b> example shows how to combine QLabel "
+               "and QScrollArea to display an image. QLabel is typically used "
+               "for displaying a text, but it can also display an image. "
+               "QScrollArea provides a scrolling view around another widget. "
+               "If the child widget exceeds the size of the frame, QScrollArea "
+               "automatically provides scroll bars. </p><p>The example "
+               "demonstrates how QLabel's ability to scale its contents "
+               "(QLabel::scaledContents), and QScrollArea's ability to "
+               "automatically resize its contents "
+               "(QScrollArea::widgetResizable), can be used to implement "
+               "zooming and scaling features. </p><p>In addition the example "
+               "shows how to use QPainter to print an image.</p>"));
+}
+//! [16]
+
+//! [17]
+void ImageViewer::createActions()
+//! [17] //! [18]
+{
+    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
+
+    QAction *openAct = fileMenu->addAction(tr("&Open..."), this, &ImageViewer::open);
+    openAct->setShortcut(QKeySequence::Open);
+
+    saveAsAct = fileMenu->addAction(tr("&Save As..."), this, &ImageViewer::saveAs);
+    saveAsAct->setEnabled(false);
+
+    printAct = fileMenu->addAction(tr("&Print..."), this, &ImageViewer::print);
+    printAct->setShortcut(QKeySequence::Print);
+    printAct->setEnabled(false);
+
+    fileMenu->addSeparator();
+
+    QAction *exitAct = fileMenu->addAction(tr("E&xit"), this, &QWidget::close);
+    exitAct->setShortcut(tr("Ctrl+Q"));
+
+    QMenu *editMenu = menuBar()->addMenu(tr("&Edit"));
+
+    copyAct = editMenu->addAction(tr("&Copy"), this, &ImageViewer::copy);
+    copyAct->setShortcut(QKeySequence::Copy);
+    copyAct->setEnabled(false);
+
+    QAction *pasteAct = editMenu->addAction(tr("&Paste"), this, &ImageViewer::paste);
+    pasteAct->setShortcut(QKeySequence::Paste);
+
+    QMenu *viewMenu = menuBar()->addMenu(tr("&View"));
+
+    zoomInAct = viewMenu->addAction(tr("Zoom &In (25%)"), this, &ImageViewer::zoomIn);
+    zoomInAct->setShortcut(QKeySequence::ZoomIn);
+    zoomInAct->setEnabled(false);
+
+    zoomOutAct = viewMenu->addAction(tr("Zoom &Out (25%)"), this, &ImageViewer::zoomOut);
+    zoomOutAct->setShortcut(QKeySequence::ZoomOut);
+    zoomOutAct->setEnabled(false);
+
+    normalSizeAct = viewMenu->addAction(tr("&Normal Size"), this, &ImageViewer::normalSize);
+    normalSizeAct->setShortcut(tr("Ctrl+S"));
+    normalSizeAct->setEnabled(false);
+
+    viewMenu->addSeparator();
+
+    fitToWindowAct = viewMenu->addAction(tr("&Fit to Window"), this, &ImageViewer::fitToWindow);
+    fitToWindowAct->setEnabled(false);
+    fitToWindowAct->setCheckable(true);
+    fitToWindowAct->setShortcut(tr("Ctrl+F"));
+
+    QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
+
+    helpMenu->addAction(tr("&About"), this, &ImageViewer::about);
+    helpMenu->addAction(tr("About &Qt"), this, &QApplication::aboutQt);
+}
+//! [18]
+
+//! [21]
+void ImageViewer::updateActions()
+//! [21] //! [22]
+{
+    saveAsAct->setEnabled(!image.isNull());
+    copyAct->setEnabled(!image.isNull());
+    zoomInAct->setEnabled(!fitToWindowAct->isChecked());
+    zoomOutAct->setEnabled(!fitToWindowAct->isChecked());
+    normalSizeAct->setEnabled(!fitToWindowAct->isChecked());
+}
+//! [22]
+
+//! [23]
+void ImageViewer::scaleImage(double factor)
+//! [23] //! [24]
+{
+    scaleFactor *= factor;
+    imageLabel->resize(scaleFactor * imageLabel->pixmap().size());
+
+    adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
+    adjustScrollBar(scrollArea->verticalScrollBar(), factor);
+
+    zoomInAct->setEnabled(scaleFactor < 3.0);
+    zoomOutAct->setEnabled(scaleFactor > 0.333);
+}
+//! [24]
+
+//! [25]
+void ImageViewer::adjustScrollBar(QScrollBar *scrollBar, double factor)
+//! [25] //! [26]
+{
+    scrollBar->setValue(int(factor * scrollBar->value()
+                            + ((factor - 1) * scrollBar->pageStep()/2)));
+}
+//! [26]