f82b504ef4
- Fix the save as file dialog being in "Open" mode by setting acceptMode - Fix clazy warnings about detaching QList by using constFirst() - Fix clazy warning about passing a context to slot connection Change-Id: I0c800e9829e118fcec477322aa2a13660e3b51d2 Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io> (cherry picked from commit fe1ef3ebcbfe017bdb01e16480a5c38cad6e39b9) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
408 lines
13 KiB
C++
408 lines
13 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "imageviewer.h"
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#include <QApplication>
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#include <QClipboard>
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#include <QColorSpace>
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#include <QDir>
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#include <QFileDialog>
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#include <QImageReader>
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#include <QImageWriter>
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#include <QLabel>
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#include <QMenuBar>
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#include <QMessageBox>
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#include <QMimeData>
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#include <QPainter>
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#include <QScreen>
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#include <QScrollArea>
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#include <QScrollBar>
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#include <QStandardPaths>
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#include <QStatusBar>
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#if defined(QT_PRINTSUPPORT_LIB)
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# include <QtPrintSupport/qtprintsupportglobal.h>
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# if QT_CONFIG(printdialog)
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# include <QPrintDialog>
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# endif
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#endif
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//! [0]
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ImageViewer::ImageViewer(QWidget *parent)
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: QMainWindow(parent), imageLabel(new QLabel)
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, scrollArea(new QScrollArea)
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{
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imageLabel->setBackgroundRole(QPalette::Base);
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imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
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imageLabel->setScaledContents(true);
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scrollArea->setBackgroundRole(QPalette::Dark);
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scrollArea->setWidget(imageLabel);
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scrollArea->setVisible(false);
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setCentralWidget(scrollArea);
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createActions();
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resize(QGuiApplication::primaryScreen()->availableSize() * 3 / 5);
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}
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//! [0]
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//! [2]
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bool ImageViewer::loadFile(const QString &fileName)
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{
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QImageReader reader(fileName);
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reader.setAutoTransform(true);
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const QImage newImage = reader.read();
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if (newImage.isNull()) {
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QMessageBox::information(this, QGuiApplication::applicationDisplayName(),
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tr("Cannot load %1: %2")
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.arg(QDir::toNativeSeparators(fileName), reader.errorString()));
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return false;
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}
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//! [2]
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setImage(newImage);
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setWindowFilePath(fileName);
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const QString message = tr("Opened \"%1\", %2x%3, Depth: %4")
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.arg(QDir::toNativeSeparators(fileName)).arg(image.width()).arg(image.height()).arg(image.depth());
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statusBar()->showMessage(message);
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return true;
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}
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void ImageViewer::setImage(const QImage &newImage)
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{
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image = newImage;
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if (image.colorSpace().isValid())
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image.convertToColorSpace(QColorSpace::SRgb);
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imageLabel->setPixmap(QPixmap::fromImage(image));
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//! [4]
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scaleFactor = 1.0;
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scrollArea->setVisible(true);
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printAct->setEnabled(true);
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fitToWindowAct->setEnabled(true);
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updateActions();
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if (!fitToWindowAct->isChecked())
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imageLabel->adjustSize();
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}
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//! [4]
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bool ImageViewer::saveFile(const QString &fileName)
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{
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QImageWriter writer(fileName);
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if (!writer.write(image)) {
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QMessageBox::information(this, QGuiApplication::applicationDisplayName(),
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tr("Cannot write %1: %2")
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.arg(QDir::toNativeSeparators(fileName)), writer.errorString());
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return false;
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}
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const QString message = tr("Wrote \"%1\"").arg(QDir::toNativeSeparators(fileName));
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statusBar()->showMessage(message);
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return true;
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}
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//! [1]
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static void initializeImageFileDialog(QFileDialog &dialog, QFileDialog::AcceptMode acceptMode)
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{
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static bool firstDialog = true;
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if (firstDialog) {
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firstDialog = false;
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const QStringList picturesLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
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dialog.setDirectory(picturesLocations.isEmpty() ? QDir::currentPath() : picturesLocations.last());
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}
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QStringList mimeTypeFilters;
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const QByteArrayList supportedMimeTypes = acceptMode == QFileDialog::AcceptOpen
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? QImageReader::supportedMimeTypes() : QImageWriter::supportedMimeTypes();
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for (const QByteArray &mimeTypeName : supportedMimeTypes)
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mimeTypeFilters.append(mimeTypeName);
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mimeTypeFilters.sort();
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dialog.setMimeTypeFilters(mimeTypeFilters);
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dialog.selectMimeTypeFilter("image/jpeg");
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dialog.setAcceptMode(acceptMode);
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if (acceptMode == QFileDialog::AcceptSave)
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dialog.setDefaultSuffix("jpg");
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}
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void ImageViewer::open()
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{
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QFileDialog dialog(this, tr("Open File"));
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initializeImageFileDialog(dialog, QFileDialog::AcceptOpen);
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while (dialog.exec() == QDialog::Accepted && !loadFile(dialog.selectedFiles().constFirst())) {}
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}
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//! [1]
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void ImageViewer::saveAs()
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{
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QFileDialog dialog(this, tr("Save File As"));
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initializeImageFileDialog(dialog, QFileDialog::AcceptSave);
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while (dialog.exec() == QDialog::Accepted && !saveFile(dialog.selectedFiles().constFirst())) {}
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}
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//! [5]
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void ImageViewer::print()
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//! [5] //! [6]
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{
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Q_ASSERT(!imageLabel->pixmap(Qt::ReturnByValue).isNull());
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#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
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//! [6] //! [7]
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QPrintDialog dialog(&printer, this);
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//! [7] //! [8]
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if (dialog.exec()) {
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QPainter painter(&printer);
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QPixmap pixmap = imageLabel->pixmap(Qt::ReturnByValue);
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QRect rect = painter.viewport();
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QSize size = pixmap.size();
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size.scale(rect.size(), Qt::KeepAspectRatio);
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painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
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painter.setWindow(pixmap.rect());
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painter.drawPixmap(0, 0, pixmap);
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}
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#endif
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}
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//! [8]
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void ImageViewer::copy()
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{
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#ifndef QT_NO_CLIPBOARD
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QGuiApplication::clipboard()->setImage(image);
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#endif // !QT_NO_CLIPBOARD
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}
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#ifndef QT_NO_CLIPBOARD
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static QImage clipboardImage()
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{
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if (const QMimeData *mimeData = QGuiApplication::clipboard()->mimeData()) {
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if (mimeData->hasImage()) {
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const QImage image = qvariant_cast<QImage>(mimeData->imageData());
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if (!image.isNull())
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return image;
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}
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}
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return QImage();
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}
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#endif // !QT_NO_CLIPBOARD
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void ImageViewer::paste()
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{
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#ifndef QT_NO_CLIPBOARD
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const QImage newImage = clipboardImage();
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if (newImage.isNull()) {
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statusBar()->showMessage(tr("No image in clipboard"));
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} else {
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setImage(newImage);
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setWindowFilePath(QString());
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const QString message = tr("Obtained image from clipboard, %1x%2, Depth: %3")
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.arg(newImage.width()).arg(newImage.height()).arg(newImage.depth());
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statusBar()->showMessage(message);
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}
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#endif // !QT_NO_CLIPBOARD
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}
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//! [9]
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void ImageViewer::zoomIn()
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//! [9] //! [10]
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{
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scaleImage(1.25);
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}
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void ImageViewer::zoomOut()
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{
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scaleImage(0.8);
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}
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//! [10] //! [11]
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void ImageViewer::normalSize()
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//! [11] //! [12]
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{
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imageLabel->adjustSize();
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scaleFactor = 1.0;
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}
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//! [12]
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//! [13]
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void ImageViewer::fitToWindow()
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//! [13] //! [14]
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{
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bool fitToWindow = fitToWindowAct->isChecked();
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scrollArea->setWidgetResizable(fitToWindow);
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if (!fitToWindow)
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normalSize();
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updateActions();
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}
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//! [14]
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//! [15]
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void ImageViewer::about()
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//! [15] //! [16]
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{
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QMessageBox::about(this, tr("About Image Viewer"),
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tr("<p>The <b>Image Viewer</b> example shows how to combine QLabel "
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"and QScrollArea to display an image. QLabel is typically used "
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"for displaying a text, but it can also display an image. "
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"QScrollArea provides a scrolling view around another widget. "
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"If the child widget exceeds the size of the frame, QScrollArea "
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"automatically provides scroll bars. </p><p>The example "
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"demonstrates how QLabel's ability to scale its contents "
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"(QLabel::scaledContents), and QScrollArea's ability to "
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"automatically resize its contents "
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"(QScrollArea::widgetResizable), can be used to implement "
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"zooming and scaling features. </p><p>In addition the example "
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"shows how to use QPainter to print an image.</p>"));
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}
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//! [16]
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//! [17]
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void ImageViewer::createActions()
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//! [17] //! [18]
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{
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QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
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QAction *openAct = fileMenu->addAction(tr("&Open..."), this, &ImageViewer::open);
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openAct->setShortcut(QKeySequence::Open);
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saveAsAct = fileMenu->addAction(tr("&Save As..."), this, &ImageViewer::saveAs);
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saveAsAct->setEnabled(false);
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printAct = fileMenu->addAction(tr("&Print..."), this, &ImageViewer::print);
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printAct->setShortcut(QKeySequence::Print);
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printAct->setEnabled(false);
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fileMenu->addSeparator();
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QAction *exitAct = fileMenu->addAction(tr("E&xit"), this, &QWidget::close);
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exitAct->setShortcut(tr("Ctrl+Q"));
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QMenu *editMenu = menuBar()->addMenu(tr("&Edit"));
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copyAct = editMenu->addAction(tr("&Copy"), this, &ImageViewer::copy);
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copyAct->setShortcut(QKeySequence::Copy);
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copyAct->setEnabled(false);
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QAction *pasteAct = editMenu->addAction(tr("&Paste"), this, &ImageViewer::paste);
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pasteAct->setShortcut(QKeySequence::Paste);
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QMenu *viewMenu = menuBar()->addMenu(tr("&View"));
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zoomInAct = viewMenu->addAction(tr("Zoom &In (25%)"), this, &ImageViewer::zoomIn);
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zoomInAct->setShortcut(QKeySequence::ZoomIn);
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zoomInAct->setEnabled(false);
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zoomOutAct = viewMenu->addAction(tr("Zoom &Out (25%)"), this, &ImageViewer::zoomOut);
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zoomOutAct->setShortcut(QKeySequence::ZoomOut);
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zoomOutAct->setEnabled(false);
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normalSizeAct = viewMenu->addAction(tr("&Normal Size"), this, &ImageViewer::normalSize);
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normalSizeAct->setShortcut(tr("Ctrl+S"));
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normalSizeAct->setEnabled(false);
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viewMenu->addSeparator();
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fitToWindowAct = viewMenu->addAction(tr("&Fit to Window"), this, &ImageViewer::fitToWindow);
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fitToWindowAct->setEnabled(false);
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fitToWindowAct->setCheckable(true);
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fitToWindowAct->setShortcut(tr("Ctrl+F"));
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QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
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helpMenu->addAction(tr("&About"), this, &ImageViewer::about);
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helpMenu->addAction(tr("About &Qt"), this, &QApplication::aboutQt);
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}
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//! [18]
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//! [21]
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void ImageViewer::updateActions()
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//! [21] //! [22]
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{
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saveAsAct->setEnabled(!image.isNull());
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copyAct->setEnabled(!image.isNull());
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zoomInAct->setEnabled(!fitToWindowAct->isChecked());
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zoomOutAct->setEnabled(!fitToWindowAct->isChecked());
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normalSizeAct->setEnabled(!fitToWindowAct->isChecked());
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}
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//! [22]
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//! [23]
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void ImageViewer::scaleImage(double factor)
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//! [23] //! [24]
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{
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scaleFactor *= factor;
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imageLabel->resize(scaleFactor * imageLabel->pixmap(Qt::ReturnByValue).size());
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adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
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adjustScrollBar(scrollArea->verticalScrollBar(), factor);
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zoomInAct->setEnabled(scaleFactor < 3.0);
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zoomOutAct->setEnabled(scaleFactor > 0.333);
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}
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//! [24]
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//! [25]
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void ImageViewer::adjustScrollBar(QScrollBar *scrollBar, double factor)
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//! [25] //! [26]
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{
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scrollBar->setValue(int(factor * scrollBar->value()
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+ ((factor - 1) * scrollBar->pageStep()/2)));
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}
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//! [26]
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