f6a5e3d1e8
amends 677825f0ba.
Change-Id: I8bc3ade3a1602b9a2c0bdc837f4b19c67b2e0dba
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
142 lines
4.9 KiB
C++
142 lines
4.9 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
|
|
** Contact: http://www.qt-project.org/legal
|
|
**
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** 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 Digia Plc and its Subsidiary(-ies) 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 "imagescaling.h"
|
|
#include "math.h"
|
|
|
|
const int imageSize = 100;
|
|
|
|
QImage scale(const QString &imageFileName)
|
|
{
|
|
QImage image(imageFileName);
|
|
return image.scaled(QSize(imageSize, imageSize), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
|
|
}
|
|
|
|
Images::Images(QWidget *parent)
|
|
: QWidget(parent)
|
|
{
|
|
setWindowTitle(tr("Image loading and scaling example"));
|
|
resize(800, 600);
|
|
|
|
imageScaling = new QFutureWatcher<QImage>(this);
|
|
connect(imageScaling, SIGNAL(resultReadyAt(int)), SLOT(showImage(int)));
|
|
connect(imageScaling, SIGNAL(finished()), SLOT(finished()));
|
|
|
|
openButton = new QPushButton(tr("Open Images"));
|
|
connect(openButton, SIGNAL(clicked()), SLOT(open()));
|
|
|
|
cancelButton = new QPushButton(tr("Cancel"));
|
|
cancelButton->setEnabled(false);
|
|
connect(cancelButton, SIGNAL(clicked()), imageScaling, SLOT(cancel()));
|
|
|
|
pauseButton = new QPushButton(tr("Pause/Resume"));
|
|
pauseButton->setEnabled(false);
|
|
connect(pauseButton, SIGNAL(clicked()), imageScaling, SLOT(togglePaused()));
|
|
|
|
QHBoxLayout *buttonLayout = new QHBoxLayout();
|
|
buttonLayout->addWidget(openButton);
|
|
buttonLayout->addWidget(cancelButton);
|
|
buttonLayout->addWidget(pauseButton);
|
|
buttonLayout->addStretch();
|
|
|
|
imagesLayout = new QGridLayout();
|
|
|
|
mainLayout = new QVBoxLayout();
|
|
mainLayout->addLayout(buttonLayout);
|
|
mainLayout->addLayout(imagesLayout);
|
|
mainLayout->addStretch();
|
|
setLayout(mainLayout);
|
|
}
|
|
|
|
Images::~Images()
|
|
{
|
|
imageScaling->cancel();
|
|
imageScaling->waitForFinished();
|
|
}
|
|
|
|
void Images::open()
|
|
{
|
|
// Cancel and wait if we are already loading images.
|
|
if (imageScaling->isRunning()) {
|
|
imageScaling->cancel();
|
|
imageScaling->waitForFinished();
|
|
}
|
|
|
|
// Show a file open dialog at QStandardPaths::PicturesLocation.
|
|
QStringList files = QFileDialog::getOpenFileNames(this, tr("Select Images"),
|
|
QStandardPaths::writableLocation(QStandardPaths::PicturesLocation),
|
|
"*.jpg *.png");
|
|
|
|
if (files.count() == 0)
|
|
return;
|
|
|
|
// Do a simple layout.
|
|
qDeleteAll(labels);
|
|
labels.clear();
|
|
|
|
int dim = sqrt(qreal(files.count())) + 1;
|
|
for (int i = 0; i < dim; ++i) {
|
|
for (int j = 0; j < dim; ++j) {
|
|
QLabel *imageLabel = new QLabel;
|
|
imageLabel->setFixedSize(imageSize,imageSize);
|
|
imagesLayout->addWidget(imageLabel,i,j);
|
|
labels.append(imageLabel);
|
|
}
|
|
}
|
|
|
|
// Use mapped to run the thread safe scale function on the files.
|
|
imageScaling->setFuture(QtConcurrent::mapped(files, scale));
|
|
|
|
openButton->setEnabled(false);
|
|
cancelButton->setEnabled(true);
|
|
pauseButton->setEnabled(true);
|
|
}
|
|
|
|
void Images::showImage(int num)
|
|
{
|
|
labels[num]->setPixmap(QPixmap::fromImage(imageScaling->resultAt(num)));
|
|
}
|
|
|
|
void Images::finished()
|
|
{
|
|
openButton->setEnabled(true);
|
|
cancelButton->setEnabled(false);
|
|
pauseButton->setEnabled(false);
|
|
}
|