source: trunk/examples/qtconcurrent/imagescaling/imagescaling.cpp@ 561

Last change on this file since 561 was 561, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.1 sources.
File size: 4.9 KB
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1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the examples of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
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40****************************************************************************/
41#include "imagescaling.h"
42#include "math.h"
43
44#ifndef QT_NO_CONCURRENT
45
46const int imageSize = 100;
47
48QImage scale(const QString &imageFileName)
49{
50 QImage image(imageFileName);
51 return image.scaled(QSize(imageSize, imageSize), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
52}
53
54Images::Images(QWidget *parent)
55: QWidget(parent)
56{
57 setWindowTitle(tr("Image loading and scaling example"));
58 resize(800, 600);
59
60 imageScaling = new QFutureWatcher<QImage>(this);
61 connect(imageScaling, SIGNAL(resultReadyAt(int)), SLOT(showImage(int)));
62 connect(imageScaling, SIGNAL(finished()), SLOT(finished()));
63
64 openButton = new QPushButton(tr("Open Images"));
65 connect(openButton, SIGNAL(clicked()), SLOT(open()));
66
67 cancelButton = new QPushButton(tr("Cancel"));
68 cancelButton->setEnabled(false);
69 connect(cancelButton, SIGNAL(clicked()), imageScaling, SLOT(cancel()));
70
71 pauseButton = new QPushButton(tr("Pause/Resume"));
72 pauseButton->setEnabled(false);
73 connect(pauseButton, SIGNAL(clicked()), imageScaling, SLOT(togglePaused()));
74
75 QHBoxLayout *buttonLayout = new QHBoxLayout();
76 buttonLayout->addWidget(openButton);
77 buttonLayout->addWidget(cancelButton);
78 buttonLayout->addWidget(pauseButton);
79 buttonLayout->addStretch();
80
81 imagesLayout = new QGridLayout();
82
83 mainLayout = new QVBoxLayout();
84 mainLayout->addLayout(buttonLayout);
85 mainLayout->addLayout(imagesLayout);
86 mainLayout->addStretch();
87 setLayout(mainLayout);
88}
89