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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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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 "mainwindow.h" |
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44 #include "scribblearea.h" |
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45 |
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46 //! [0] |
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47 MainWindow::MainWindow() |
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48 { |
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49 scribbleArea = new ScribbleArea; |
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50 setCentralWidget(scribbleArea); |
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51 |
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52 createActions(); |
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53 createMenus(); |
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54 |
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55 setWindowTitle(tr("Finger Paint")); |
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56 resize(500, 500); |
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57 } |
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58 //! [0] |
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59 |
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60 //! [1] |
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61 void MainWindow::closeEvent(QCloseEvent *event) |
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62 //! [1] //! [2] |
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63 { |
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64 if (maybeSave()) { |
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65 event->accept(); |
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66 } else { |
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67 event->ignore(); |
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68 } |
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69 } |
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70 //! [2] |
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71 |
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72 //! [3] |
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73 void MainWindow::open() |
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74 //! [3] //! [4] |
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75 { |
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76 if (maybeSave()) { |
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77 QString fileName = QFileDialog::getOpenFileName(this, |
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78 tr("Open File"), QDir::currentPath()); |
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79 if (!fileName.isEmpty()) |
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80 scribbleArea->openImage(fileName); |
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81 } |
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82 } |
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83 //! [4] |
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84 |
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85 //! [5] |
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86 void MainWindow::save() |
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87 //! [5] //! [6] |
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88 { |
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89 QAction *action = qobject_cast<QAction *>(sender()); |
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90 QByteArray fileFormat = action->data().toByteArray(); |
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91 saveFile(fileFormat); |
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92 } |
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93 //! [6] |
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94 |
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95 //! [11] |
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96 void MainWindow::about() |
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97 //! [11] //! [12] |
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98 { |
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99 QMessageBox::about(this, tr("About Scribble"), |
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100 tr("<p>The <b>Scribble</b> example shows how to use QMainWindow as the " |
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101 "base widget for an application, and how to reimplement some of " |
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102 "QWidget's event handlers to receive the events generated for " |
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103 "the application's widgets:</p><p> We reimplement the mouse event " |
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104 "handlers to facilitate drawing, the paint event handler to " |
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105 "update the application and the resize event handler to optimize " |
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106 "the application's appearance. In addition we reimplement the " |
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107 "close event handler to intercept the close events before " |
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108 "terminating the application.</p><p> The example also demonstrates " |
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109 "how to use QPainter to draw an image in real time, as well as " |
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110 "to repaint widgets.</p>")); |
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111 } |
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112 //! [12] |
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113 |
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114 //! [13] |
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115 void MainWindow::createActions() |
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116 //! [13] //! [14] |
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117 { |
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118 openAct = new QAction(tr("&Open..."), this); |
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119 openAct->setShortcut(tr("Ctrl+O")); |
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120 connect(openAct, SIGNAL(triggered()), this, SLOT(open())); |
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121 |
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122 foreach (QByteArray format, QImageWriter::supportedImageFormats()) { |
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123 QString text = tr("%1...").arg(QString(format).toUpper()); |
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124 |
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125 QAction *action = new QAction(text, this); |
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126 action->setData(format); |
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127 connect(action, SIGNAL(triggered()), this, SLOT(save())); |
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128 saveAsActs.append(action); |
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129 } |
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130 |
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131 printAct = new QAction(tr("&Print..."), this); |
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132 connect(printAct, SIGNAL(triggered()), scribbleArea, SLOT(print())); |
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133 |
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134 exitAct = new QAction(tr("E&xit"), this); |
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135 exitAct->setShortcut(tr("Ctrl+Q")); |
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136 connect(exitAct, SIGNAL(triggered()), this, SLOT(close())); |
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137 |
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138 clearScreenAct = new QAction(tr("&Clear Screen"), this); |
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139 clearScreenAct->setShortcut(tr("Ctrl+L")); |
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140 connect(clearScreenAct, SIGNAL(triggered()), |
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141 scribbleArea, SLOT(clearImage())); |
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142 |
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143 aboutAct = new QAction(tr("&About"), this); |
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144 connect(aboutAct, SIGNAL(triggered()), this, SLOT(about())); |
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145 |
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146 aboutQtAct = new QAction(tr("About &Qt"), this); |
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147 connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt())); |
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148 } |
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149 //! [14] |
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150 |
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151 //! [15] |
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152 void MainWindow::createMenus() |
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153 //! [15] //! [16] |
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154 { |
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155 saveAsMenu = new QMenu(tr("&Save As"), this); |
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156 foreach (QAction *action, saveAsActs) |
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157 saveAsMenu->addAction(action); |
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158 |
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159 fileMenu = new QMenu(tr("&File"), this); |
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160 fileMenu->addAction(openAct); |
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161 fileMenu->addMenu(saveAsMenu); |
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162 fileMenu->addAction(printAct); |
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163 fileMenu->addSeparator(); |
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164 fileMenu->addAction(exitAct); |
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165 |
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166 optionMenu = new QMenu(tr("&Options"), this); |
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167 optionMenu->addAction(clearScreenAct); |
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168 |
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169 helpMenu = new QMenu(tr("&Help"), this); |
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170 helpMenu->addAction(aboutAct); |
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171 helpMenu->addAction(aboutQtAct); |
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172 |
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173 menuBar()->addMenu(fileMenu); |
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174 menuBar()->addMenu(optionMenu); |
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175 menuBar()->addMenu(helpMenu); |
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176 } |
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177 //! [16] |
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178 |
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179 //! [17] |
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180 bool MainWindow::maybeSave() |
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181 //! [17] //! [18] |
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182 { |
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183 if (scribbleArea->isModified()) { |
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184 QMessageBox::StandardButton ret; |
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185 ret = QMessageBox::warning(this, tr("Scribble"), |
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186 tr("The image has been modified.\n" |
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187 "Do you want to save your changes?"), |
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188 QMessageBox::Save | QMessageBox::Discard |
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189 | QMessageBox::Cancel); |
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190 if (ret == QMessageBox::Save) { |
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191 return saveFile("png"); |
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192 } else if (ret == QMessageBox::Cancel) { |
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193 return false; |
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194 } |
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195 } |
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196 return true; |
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197 } |
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198 //! [18] |
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199 |
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200 //! [19] |
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201 bool MainWindow::saveFile(const QByteArray &fileFormat) |
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202 //! [19] //! [20] |
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203 { |
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204 QString initialPath = QDir::currentPath() + "/untitled." + fileFormat; |
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205 |
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206 QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), |
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207 initialPath, |
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208 tr("%1 Files (*.%2);;All Files (*)") |
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209 .arg(QString(fileFormat.toUpper())) |
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210 .arg(QString(fileFormat))); |
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211 if (fileName.isEmpty()) { |
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212 return false; |
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213 } else { |
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214 return scribbleArea->saveImage(fileName, fileFormat); |
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215 } |
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216 } |
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217 //! [20] |