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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 documentation 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 //! [0] |
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43 QT -= gui |
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44 //! [0] |
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45 |
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46 |
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47 //! [1] |
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48 QT += network opengl sql qt3support |
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49 //! [1] |
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50 |
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51 |
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52 //! [2] |
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53 CONFIG += uic3 |
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54 //! [2] |
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55 |
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56 |
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57 //! [3] |
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58 #include <QClassName> |
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59 //! [3] |
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60 |
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61 |
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62 //! [4] |
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63 #include <QString> |
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64 #include <QApplication> |
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65 #include <QSqlTableModel> |
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66 //! [4] |
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67 |
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68 |
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69 //! [5] |
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70 #include <qclassname.h> |
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71 //! [5] |
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72 |
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73 |
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74 //! [6] |
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75 #include <QtCore> |
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76 //! [6] |
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77 |
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78 |
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79 //! [7] |
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80 using namespace Qt; |
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81 //! [7] |
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82 |
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83 |
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84 //! [8] |
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85 QLabel *label1 = new QLabel("Hello", this); |
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86 QLabel *label2 = new QLabel(this, "Hello"); |
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87 //! [8] |
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88 |
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89 |
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90 //! [9] |
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91 MyWidget::MyWidget(QWidget *parent, const char *name) |
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92 : QWidget(parent, name) |
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93 { |
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94 ... |
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95 } |
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96 //! [9] |
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97 |
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98 |
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99 //! [10] |
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100 // DEPRECATED |
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101 if (obj->inherits("QPushButton")) { |
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102 QPushButton *pushButton = (QPushButton *)obj; |
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103 ... |
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104 } |
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105 //! [10] |
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106 |
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107 |
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108 //! [11] |
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109 QPushButton *pushButton = qobject_cast<QPushButton *>(obj); |
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110 if (pushButton) { |
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111 ... |
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112 } |
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113 //! [11] |
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114 |
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115 |
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116 //! [12] |
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117 QLabel *label = new QLabel; |
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118 QPointer<QLabel> safeLabel = label; |
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119 safeLabel->setText("Hello world!"); |
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120 delete label; |
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121 // safeLabel is now 0, whereas label is a dangling pointer |
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122 //! [12] |
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123 |
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124 |
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125 //! [13] |
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126 QT += qt3support |
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127 //! [13] |
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128 |
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129 |
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130 //! [14] |
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131 DEFINES += QT3_SUPPORT |
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132 //! [14] |
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133 |
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134 |
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135 //! [15] |
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136 DEFINES += QT3_SUPPORT_WARNINGS |
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137 //! [15] |
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138 |
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139 |
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140 //! [16] |
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141 DEFINES += QT3_SUPPORT |
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142 //! [16] |