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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 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 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include <QtGui> |
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43 |
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44 #include "mainwindow.h" |
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45 #include "scribblearea.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 scribbleArea = new ScribbleArea; |
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51 setCentralWidget(scribbleArea); |
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52 |
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53 createActions(); |
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54 createMenus(); |
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55 |
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56 setWindowTitle(tr("Finger Paint")); |
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57 resize(500, 500); |
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58 } |
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59 //! [0] |
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60 |
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61 //! [1] |
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62 void MainWindow::closeEvent(QCloseEvent *event) |
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63 //! [1] //! [2] |
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64 { |
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65 if (maybeSave()) { |
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66 event->accept(); |
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67 } else { |
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68 event->ignore(); |
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69 } |
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70 } |
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71 //! [2] |
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72 |
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73 //! [3] |
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74 void MainWindow::open() |
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75 //! [3] //! [4] |
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76 { |
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77 if (maybeSave()) { |
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78 QString fileName = QFileDialog::getOpenFileName(this, |
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79 tr("Open File"), QDir::currentPath()); |
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80 if (!fileName.isEmpty()) |
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81 scribbleArea->openImage(fileName); |
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82 } |
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83 } |
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84 //! [4] |
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85 |
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86 //! [5] |
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87 void MainWindow::save() |
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88 //! [5] //! [6] |
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89 { |
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90 QAction *action = qobject_cast<QAction *>(sender()); |
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91 QByteArray fileFormat = action->data().toByteArray(); |
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92 saveFile(fileFormat); |
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93 } |
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94 //! [6] |
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95 |
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96 //! [11] |
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97 void MainWindow::about() |
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98 //! [11] //! [12] |
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99 { |
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100 QMessageBox::about(this, tr("About Scribble"), |
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101 tr("<p>The <b>Scribble</b> example shows how to use QMainWindow as the " |
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102 "base widget for an application, and how to reimplement some of " |
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103 "QWidget's event handlers to receive the events generated for " |
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104 "the application's widgets:</p><p> We reimplement the mouse event " |
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105 "handlers to facilitate drawing, the paint event handler to " |
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106 "update the application and the resize event handler to optimize " |
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107 "the application's appearance. In addition we reimplement the " |
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108 "close event handler to intercept the close events before " |
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109 "terminating the application.</p><p> The example also demonstrates " |
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110 "how to use QPainter to draw an image in real time, as well as " |
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111 "to repaint widgets.</p>")); |
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112 } |
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113 //! [12] |
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114 |
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115 //! [13] |
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116 void MainWindow::createActions() |
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117 //! [13] //! [14] |
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118 { |
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119 openAct = new QAction(tr("&Open..."), this); |
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120 openAct->setShortcut(tr("Ctrl+O")); |
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121 connect(openAct, SIGNAL(triggered()), this, SLOT(open())); |
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122 |
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123 foreach (QByteArray format, QImageWriter::supportedImageFormats()) { |
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124 QString text = tr("%1...").arg(QString(format).toUpper()); |
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125 |
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126 QAction *action = new QAction(text, this); |
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127 action->setData(format); |
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128 connect(action, SIGNAL(triggered()), this, SLOT(save())); |
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129 saveAsActs.append(action); |
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130 } |
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131 |
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132 printAct = new QAction(tr("&Print..."), this); |
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133 connect(printAct, SIGNAL(triggered()), scribbleArea, SLOT(print())); |
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134 |
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135 exitAct = new QAction(tr("E&xit"), this); |
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136 exitAct->setShortcut(tr("Ctrl+Q")); |
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137 connect(exitAct, SIGNAL(triggered()), this, SLOT(close())); |
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138 |
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139 clearScreenAct = new QAction(tr("&Clear Screen"), this); |
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140 clearScreenAct->setShortcut(tr("Ctrl+L")); |
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141 connect(clearScreenAct, SIGNAL(triggered()), |
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142 scribbleArea, SLOT(clearImage())); |
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143 |
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144 aboutAct = new QAction(tr("&About"), this); |
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145 connect(aboutAct, SIGNAL(triggered()), this, SLOT(about())); |
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146 |
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147 aboutQtAct = new QAction(tr("About &Qt"), this); |
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148 connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt())); |
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149 } |
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150 //! [14] |
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151 |
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152 //! [15] |
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153 void MainWindow::createMenus() |
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154 //! [15] //! [16] |
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155 { |
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156 saveAsMenu = new QMenu(tr("&Save As"), this); |
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157 foreach (QAction *action, saveAsActs) |
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158 saveAsMenu->addAction(action); |
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159 |
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160 fileMenu = new QMenu(tr("&File"), this); |
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161 fileMenu->addAction(openAct); |
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162 fileMenu->addMenu(saveAsMenu); |
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163 fileMenu->addAction(printAct); |
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164 fileMenu->addSeparator(); |
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165 fileMenu->addAction(exitAct); |
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166 |
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167 optionMenu = new QMenu(tr("&Options"), this); |
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168 optionMenu->addAction(clearScreenAct); |
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169 |
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170 helpMenu = new QMenu(tr("&Help"), this); |
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171 helpMenu->addAction(aboutAct); |
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172 helpMenu->addAction(aboutQtAct); |
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173 |
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174 menuBar()->addMenu(fileMenu); |
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175 menuBar()->addMenu(optionMenu); |
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176 menuBar()->addMenu(helpMenu); |
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177 } |
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178 //! [16] |
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179 |
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180 //! [17] |
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181 bool MainWindow::maybeSave() |
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182 //! [17] //! [18] |
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183 { |
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184 if (scribbleArea->isModified()) { |
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185 QMessageBox::StandardButton ret; |
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186 ret = QMessageBox::warning(this, tr("Scribble"), |
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187 tr("The image has been modified.\n" |
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188 "Do you want to save your changes?"), |
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189 QMessageBox::Save | QMessageBox::Discard |
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190 | QMessageBox::Cancel); |
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191 if (ret == QMessageBox::Save) { |
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192 return saveFile("png"); |
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193 } else if (ret == QMessageBox::Cancel) { |
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194 return false; |
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195 } |
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196 } |
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197 return true; |
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198 } |
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199 //! [18] |
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200 |
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201 //! [19] |
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202 bool MainWindow::saveFile(const QByteArray &fileFormat) |
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203 //! [19] //! [20] |
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204 { |
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205 QString initialPath = QDir::currentPath() + "/untitled." + fileFormat; |
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206 |
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207 QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), |
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208 initialPath, |
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209 tr("%1 Files (*.%2);;All Files (*)") |
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210 .arg(QString(fileFormat.toUpper())) |
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211 .arg(QString(fileFormat))); |
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212 if (fileName.isEmpty()) { |
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213 return false; |
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214 } else { |
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215 return scribbleArea->saveImage(fileName, fileFormat); |
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216 } |
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217 } |
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218 //! [20] |