1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** All rights reserved.
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5 | ** Contact: Nokia Corporation ([email protected])
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6 | **
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7 | ** This file is part of the examples of the Qt Toolkit.
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8 | **
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9 | ** $QT_BEGIN_LICENSE:BSD$
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10 | ** You may use this file under the terms of the BSD license as follows:
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11 | **
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12 | ** "Redistribution and use in source and binary forms, with or without
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13 | ** modification, are permitted provided that the following conditions are
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14 | ** met:
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15 | ** * Redistributions of source code must retain the above copyright
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16 | ** notice, this list of conditions and the following disclaimer.
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17 | ** * Redistributions in binary form must reproduce the above copyright
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18 | ** notice, this list of conditions and the following disclaimer in
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19 | ** the documentation and/or other materials provided with the
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20 | ** distribution.
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21 | ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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22 | ** the names of its contributors may be used to endorse or promote
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23 | ** products derived from this software without specific prior written
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24 | ** permission.
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25 | **
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26 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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27 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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28 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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29 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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30 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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31 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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32 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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33 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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34 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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35 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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36 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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37 | ** $QT_END_LICENSE$
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38 | **
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39 | ****************************************************************************/
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40 | #include "imagescaling.h"
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41 | #include "math.h"
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42 |
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43 | #ifndef QT_NO_CONCURRENT
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44 |
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45 | const int imageSize = 100;
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46 |
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47 | QImage scale(const QString &imageFileName)
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48 | {
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49 | QImage image(imageFileName);
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50 | return image.scaled(QSize(imageSize, imageSize), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
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51 | }
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52 |
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53 | Images::Images(QWidget *parent)
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54 | : QWidget(parent)
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55 | {
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56 | setWindowTitle(tr("Image loading and scaling example"));
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57 | resize(800, 600);
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58 |
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59 | imageScaling = new QFutureWatcher<QImage>(this);
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60 | connect(imageScaling, SIGNAL(resultReadyAt(int)), SLOT(showImage(int)));
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61 | connect(imageScaling, SIGNAL(finished()), SLOT(finished()));
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62 |
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63 | openButton = new QPushButton(tr("Open Images"));
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64 | connect(openButton, SIGNAL(clicked()), SLOT(open()));
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65 |
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66 | cancelButton = new QPushButton(tr("Cancel"));
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67 | cancelButton->setEnabled(false);
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68 | connect(cancelButton, SIGNAL(clicked()), imageScaling, SLOT(cancel()));
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69 |
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70 | pauseButton = new QPushButton(tr("Pause/Resume"));
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71 | pauseButton->setEnabled(false);
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72 | connect(pauseButton, SIGNAL(clicked()), imageScaling, SLOT(togglePaused()));
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73 |
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74 | QHBoxLayout *buttonLayout = new QHBoxLayout();
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75 | buttonLayout->addWidget(openButton);
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76 | buttonLayout->addWidget(cancelButton);
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77 | buttonLayout->addWidget(pauseButton);
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78 | buttonLayout->addStretch();
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79 |
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80 | imagesLayout = new QGridLayout();
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81 |
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82 | mainLayout = new QVBoxLayout();
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83 | mainLayout->addLayout(buttonLayout);
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84 | mainLayout->addLayout(imagesLayout);
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85 | mainLayout->addStretch();
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86 | setLayout(mainLayout);
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87 | }
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88 |
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89 | Images::~Images()
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90 | {
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91 | imageScaling->cancel();
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92 | imageScaling->waitForFinished();
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93 | }
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94 |
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95 | void Images::open()
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96 | {
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97 | // Cancel and wait if we are already loading images.
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98 | if (imageScaling->isRunning()) {
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99 | imageScaling->cancel();
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100 | imageScaling->waitForFinished();
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101 | }
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102 |
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103 | // Show a file open dialog at QDesktopServices::PicturesLocation.
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104 | QStringList files = QFileDialog::getOpenFileNames(this, tr("Select Images"),
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105 | QDesktopServices::storageLocation(QDesktopServices::PicturesLocation),
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106 | "*.jpg *.png");
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107 |
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108 | if (files.count() == 0)
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109 | return;
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110 |
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111 | // Do a simple layout.
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112 | qDeleteAll(labels);
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113 | labels.clear();
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114 |
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115 | int dim = sqrt(qreal(files.count())) + 1;
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116 | for (int i = 0; i < dim; ++i) {
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117 | for (int j = 0; j < dim; ++j) {
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118 | QLabel *imageLabel = new QLabel;
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119 | imageLabel->setFixedSize(imageSize,imageSize);
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120 | imagesLayout->addWidget(imageLabel,i,j);
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121 | labels.append(imageLabel);
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122 | }
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123 | }
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124 |
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125 | // Use mapped to run the thread safe scale function on the files.
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126 | imageScaling->setFuture(QtConcurrent::mapped(files, scale));
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127 |
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128 | openButton->setEnabled(false);
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129 | cancelButton->setEnabled(true);
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130 | pauseButton->setEnabled(true);
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131 | }
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132 |
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133 | void Images::showImage(int num)
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134 | {
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135 | labels[num]->setPixmap(QPixmap::fromImage(imageScaling->resultAt(num)));
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136 | }
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137 |
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138 | void Images::finished()
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139 | {
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140 | openButton->setEnabled(true);
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141 | cancelButton->setEnabled(false);
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142 | pauseButton->setEnabled(false);
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143 | }
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144 |
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145 | #endif // QT_NO_CONCURRENT
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146 |
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