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Diffstat (limited to 'examples/widgets/widgets/imageviewer/imageviewer.cpp')
| -rw-r--r-- | examples/widgets/widgets/imageviewer/imageviewer.cpp | 410 |
1 files changed, 0 insertions, 410 deletions
diff --git a/examples/widgets/widgets/imageviewer/imageviewer.cpp b/examples/widgets/widgets/imageviewer/imageviewer.cpp deleted file mode 100644 index 6a1072afef..0000000000 --- a/examples/widgets/widgets/imageviewer/imageviewer.cpp +++ /dev/null @@ -1,410 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the examples of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** BSD License Usage -** Alternatively, you may use this file under the terms of the BSD license -** as follows: -** -** "Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions are -** met: -** * Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** * Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** * Neither the name of The Qt Company Ltd nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#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) -{ - image = newImage; - if (image.colorSpace().isValid()) - image.convertToColorSpace(QColorSpace::SRgb); - imageLabel->setPixmap(QPixmap::fromImage(image)); -//! [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(Qt::ReturnByValue).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(Qt::ReturnByValue); - 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(Qt::ReturnByValue).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] |