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 |
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41 | #include <QtGui>
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42 |
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43 | #include "imagemodel.h"
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44 | #include "mainwindow.h"
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45 | #include "pixeldelegate.h"
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46 |
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47 | //! [0]
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48 | MainWindow::MainWindow()
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49 | {
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50 | //! [0]
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51 | currentPath = QDir::homePath();
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52 | model = new ImageModel(this);
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53 |
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54 | QWidget *centralWidget = new QWidget;
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55 |
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56 | //! [1]
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57 | view = new QTableView;
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58 | view->setShowGrid(false);
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59 | view->horizontalHeader()->hide();
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60 | view->verticalHeader()->hide();
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61 | view->horizontalHeader()->setMinimumSectionSize(1);
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62 | view->verticalHeader()->setMinimumSectionSize(1);
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63 | view->setModel(model);
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64 | //! [1]
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65 |
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66 | //! [2]
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67 | PixelDelegate *delegate = new PixelDelegate(this);
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68 | view->setItemDelegate(delegate);
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69 | //! [2]
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70 |
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71 | //! [3]
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72 | QLabel *pixelSizeLabel = new QLabel(tr("Pixel size:"));
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73 | QSpinBox *pixelSizeSpinBox = new QSpinBox;
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74 | pixelSizeSpinBox->setMinimum(4);
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75 | pixelSizeSpinBox->setMaximum(32);
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76 | pixelSizeSpinBox->setValue(12);
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77 | //! [3]
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78 |
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79 | QMenu *fileMenu = new QMenu(tr("&File"), this);
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80 | QAction *openAction = fileMenu->addAction(tr("&Open..."));
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81 | openAction->setShortcuts(QKeySequence::Open);
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82 |
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83 | printAction = fileMenu->addAction(tr("&Print..."));
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84 | printAction->setEnabled(false);
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85 | printAction->setShortcut(QKeySequence::Print);
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86 |
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87 | QAction *quitAction = fileMenu->addAction(tr("E&xit"));
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88 | quitAction->setShortcuts(QKeySequence::Quit);
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89 |
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90 | QMenu *helpMenu = new QMenu(tr("&Help"), this);
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91 | QAction *aboutAction = helpMenu->addAction(tr("&About"));
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92 |
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93 | menuBar()->addMenu(fileMenu);
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94 | menuBar()->addSeparator();
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95 | menuBar()->addMenu(helpMenu);
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96 |
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97 | connect(openAction, SIGNAL(triggered()), this, SLOT(chooseImage()));
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98 | connect(printAction, SIGNAL(triggered()), this, SLOT(printImage()));
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99 | connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
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100 | connect(aboutAction, SIGNAL(triggered()), this, SLOT(showAboutBox()));
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101 | //! [4]
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102 | connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
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103 | delegate, SLOT(setPixelSize(int)));
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104 | connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
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105 | this, SLOT(updateView()));
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106 | //! [4]
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107 |
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108 | QHBoxLayout *controlsLayout = new QHBoxLayout;
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109 | controlsLayout->addWidget(pixelSizeLabel);
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110 | controlsLayout->addWidget(pixelSizeSpinBox);
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111 | controlsLayout->addStretch(1);
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112 |
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113 | QVBoxLayout *mainLayout = new QVBoxLayout;
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114 | mainLayout->addWidget(view);
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115 | mainLayout->addLayout(controlsLayout);
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116 | centralWidget->setLayout(mainLayout);
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117 |
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118 | setCentralWidget(centralWidget);
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119 |
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120 | setWindowTitle(tr("Pixelator"));
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121 | resize(640, 480);
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122 | //! [5]
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123 | }
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124 | //! [5]
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125 |
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126 | void MainWindow::chooseImage()
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127 | {
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128 | QString fileName = QFileDialog::getOpenFileName(this,
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129 | tr("Choose an image"), currentPath, "*");
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130 |
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131 | if (!fileName.isEmpty())
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132 | openImage(fileName);
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133 | }
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134 |
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135 | void MainWindow::openImage(const QString &fileName)
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136 | {
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137 | QImage image;
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138 |
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139 | if (image.load(fileName)) {
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140 | model->setImage(image);
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141 | if (!fileName.startsWith(":/")) {
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142 | currentPath = fileName;
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143 | setWindowTitle(tr("%1 - Pixelator").arg(currentPath));
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144 | }
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145 |
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146 | printAction->setEnabled(true);
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147 | updateView();
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148 | }
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149 | }
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150 |
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151 | void MainWindow::printImage()
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152 | {
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153 | #ifndef QT_NO_PRINTER
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154 | if (model->rowCount(QModelIndex())*model->columnCount(QModelIndex())
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155 | > 90000) {
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156 | QMessageBox::StandardButton answer;
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157 | answer = QMessageBox::question(this, tr("Large Image Size"),
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158 | tr("The printed image may be very large. Are you sure that "
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159 | "you want to print it?"),
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160 | QMessageBox::Yes | QMessageBox::No);
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161 | if (answer == QMessageBox::No)
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162 | return;
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163 | }
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164 |
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165 | QPrinter printer(QPrinter::HighResolution);
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166 |
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167 | QPrintDialog *dlg = new QPrintDialog(&printer, this);
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168 | dlg->setWindowTitle(tr("Print Image"));
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169 |
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170 | if (dlg->exec() != QDialog::Accepted)
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171 | return;
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172 |
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173 | QPainter painter;
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174 | painter.begin(&printer);
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175 |
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176 | int rows = model->rowCount(QModelIndex());
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177 | int columns = model->columnCount(QModelIndex());
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178 | int sourceWidth = (columns+1) * ItemSize;
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179 | int sourceHeight = (rows+1) * ItemSize;
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180 |
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181 | painter.save();
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182 |
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183 | double xscale = printer.pageRect().width()/double(sourceWidth);
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184 | double yscale = printer.pageRect().height()/double(sourceHeight);
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185 | double scale = qMin(xscale, yscale);
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186 |
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187 | painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,
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188 | printer.paperRect().y() + printer.pageRect().height()/2);
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189 | painter.scale(scale, scale);
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190 | painter.translate(-sourceWidth/2, -sourceHeight/2);
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191 |
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192 | QStyleOptionViewItem option;
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193 | QModelIndex parent = QModelIndex();
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194 |
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195 | QProgressDialog progress(tr("Printing..."), tr("Cancel"), 0, rows, this);
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196 | progress.setWindowModality(Qt::ApplicationModal);
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197 | float y = ItemSize/2;
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198 |
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199 | for (int row = 0; row < rows; ++row) {
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200 | progress.setValue(row);
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201 | qApp->processEvents();
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202 | if (progress.wasCanceled())
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203 | break;
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204 |
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205 | float x = ItemSize/2;
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206 |
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207 | for (int column = 0; column < columns; ++column) {
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208 | option.rect = QRect(int(x), int(y), ItemSize, ItemSize);
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209 | view->itemDelegate()->paint(&painter, option,
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210 | model->index(row, column, parent));
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211 | x = x + ItemSize;
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212 | }
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213 | y = y + ItemSize;
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214 | }
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215 | progress.setValue(rows);
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216 |
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217 | painter.restore();
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218 | painter.end();
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219 |
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220 | if (progress.wasCanceled()) {
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221 | QMessageBox::information(this, tr("Printing canceled"),
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222 | tr("The printing process was canceled."), QMessageBox::Cancel);
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223 | }
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224 | #else
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225 | QMessageBox::information(this, tr("Printing canceled"),
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226 | tr("Printing is not supported on this Qt build"), QMessageBox::Cancel);
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227 | #endif
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228 | }
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229 |
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230 | void MainWindow::showAboutBox()
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231 | {
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232 | QMessageBox::about(this, tr("About the Pixelator example"),
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233 | tr("This example demonstrates how a standard view and a custom\n"
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234 | "delegate can be used to produce a specialized representation\n"
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235 | "of data in a simple custom model."));
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236 | }
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237 |
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238 | //! [6]
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239 | void MainWindow::updateView()
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240 | {
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241 | view->resizeColumnsToContents();
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242 | view->resizeRowsToContents();
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243 | }
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244 | //! [6]
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