diff options
Diffstat (limited to 'examples/widgets/gestures/imagegestures/imagewidget.cpp')
| -rw-r--r-- | examples/widgets/gestures/imagegestures/imagewidget.cpp | 89 |
1 files changed, 30 insertions, 59 deletions
diff --git a/examples/widgets/gestures/imagegestures/imagewidget.cpp b/examples/widgets/gestures/imagegestures/imagewidget.cpp index 072ec2b216..189281cc11 100644 --- a/examples/widgets/gestures/imagegestures/imagewidget.cpp +++ b/examples/widgets/gestures/imagegestures/imagewidget.cpp @@ -1,52 +1,5 @@ -/**************************************************************************** -** -** 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." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause #include "imagewidget.h" @@ -88,6 +41,12 @@ void ImageWidget::paintEvent(QPaintEvent*) { QPainter p(this); + if (files.isEmpty() && !path.isEmpty()) { + p.drawText(rect(), Qt::AlignCenter|Qt::TextWordWrap, + tr("No supported image formats found")); + return; + } + const qreal iw = currentImage.width(); const qreal ih = currentImage.height(); const qreal wh = height(); @@ -191,20 +150,32 @@ void ImageWidget::resizeEvent(QResizeEvent*) update(); } -void ImageWidget::openDirectory(const QString &path) +void ImageWidget::openDirectory(const QString &url) { - this->path = path; + path = url; QDir dir(path); - const QStringList nameFilters{"*.jpg", "*.png"}; - files = dir.entryList(nameFilters, QDir::Files|QDir::Readable, QDir::Name); + + QStringList nameFilters; + const QList<QByteArray> supportedFormats = QImageReader::supportedImageFormats(); + for (const QByteArray &format : supportedFormats) + nameFilters.append(QLatin1String("*.") + QString::fromLatin1(format)); + files = dir.entryInfoList(nameFilters, QDir::Files|QDir::Readable, QDir::Name); position = 0; goToImage(0); update(); } -QImage ImageWidget::loadImage(const QString &fileName) const +/* + With Android's content scheme paths, it might not be possible to simply + append a file name to the chosen directory path to be able to open the image, + because usually paths are returned by an Android file provider and handling those + paths manually is not guaranteed to work. For that reason, it's better to keep + around QFileInfo objects and use absoluteFilePath(). +*/ +QImage ImageWidget::loadImage(const QFileInfo &fileInfo) const { + const QString fileName = fileInfo.absoluteFilePath(); QImageReader reader(fileName); reader.setAutoTransform(true); qCDebug(lcExample) << "loading" << QDir::toNativeSeparators(fileName) << position << '/' << files.size(); @@ -234,7 +205,7 @@ void ImageWidget::goNextImage() prevImage = currentImage; currentImage = nextImage; if (position+1 < files.size()) - nextImage = loadImage(path + QLatin1Char('/') + files.at(position+1)); + nextImage = loadImage(files.at(position + 1)); else nextImage = QImage(); } @@ -251,7 +222,7 @@ void ImageWidget::goPrevImage() nextImage = currentImage; currentImage = prevImage; if (position > 0) - prevImage = loadImage(path + QLatin1Char('/') + files.at(position-1)); + prevImage = loadImage(files.at(position - 1)); else prevImage = QImage(); } @@ -281,12 +252,12 @@ void ImageWidget::goToImage(int index) position = index; if (index > 0) - prevImage = loadImage(path + QLatin1Char('/') + files.at(position-1)); + prevImage = loadImage(files.at(position - 1)); else prevImage = QImage(); - currentImage = loadImage(path + QLatin1Char('/') + files.at(position)); + currentImage = loadImage(files.at(position)); if (position+1 < files.size()) - nextImage = loadImage(path + QLatin1Char('/') + files.at(position+1)); + nextImage = loadImage(files.at(position + 1)); else nextImage = QImage(); update(); |