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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 Qt3Support module 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 "q3signal.h" |
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43 #include "qmetaobject.h" |
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44 #include "qpointer.h" |
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45 #include "q3cstring.h" |
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46 |
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47 QT_BEGIN_NAMESPACE |
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48 |
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49 /*! |
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50 \class Q3Signal |
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51 \brief The Q3Signal class can be used to send signals for classes |
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52 that don't inherit QObject. |
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53 |
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54 \compat |
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55 |
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56 If you want to send signals from a class that does not inherit |
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57 QObject, you can create an internal Q3Signal object to emit the |
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58 signal. You must also provide a function that connects the signal |
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59 to an outside object slot. This is how we used to implement |
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60 signals in Qt 3's QMenuData class, which was not a QObject. In Qt |
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61 4, menus contain actions, which are QObjects. |
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62 |
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63 In general, we recommend inheriting QObject instead. QObject |
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64 provides much more functionality. |
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65 |
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66 You can set a single QVariant parameter for the signal with |
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67 setValue(). |
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68 |
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69 Note that QObject is a \e private base class of Q3Signal, i.e. you |
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70 cannot call any QObject member functions from a Q3Signal object. |
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71 |
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72 Example: |
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73 \snippet doc/src/snippets/code/src_qt3support_tools_q3signal.cpp 0 |
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74 */ |
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75 |
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76 /*! |
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77 Constructs a signal object called \a name, with the parent object |
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78 \a parent. These arguments are passed directly to QObject. |
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79 */ |
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80 |
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81 Q3Signal::Q3Signal(QObject *parent, const char *name) |
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82 : QObject(parent, name) |
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83 { |
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84 #ifndef QT_NO_VARIANT |
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85 val = 0; |
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86 #endif |
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87 } |
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88 |
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89 /*! |
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90 Destroys the signal. All connections are removed, as is the case |
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91 with all QObjects. |
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92 */ |
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93 Q3Signal::~Q3Signal() |
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94 { |
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95 } |
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96 #ifndef QT_NO_VARIANT |
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97 // Returns true if it matches ".+(.*int.*" |
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98 static inline bool intSignature(const char *member) |
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99 { |
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100 Q3CString s(member); |
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101 int p = s.find('('); |
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102 return p > 0 && p < s.findRev("int"); |
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103 } |
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104 #endif |
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105 /*! |
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106 Connects the signal to \a member in object \a receiver. |
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107 Returns true if the connection is successful. |
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108 |
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109 \sa disconnect(), QObject::connect() |
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110 */ |
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111 |
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112 bool Q3Signal::connect(const QObject *receiver, const char *member) |
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113 { |
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114 #ifndef QT_NO_VARIANT |
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115 if (intSignature(member)) |
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116 #endif |
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117 return QObject::connect((QObject *)this, SIGNAL(intSignal(int)), receiver, member); |
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118 #ifndef QT_NO_VARIANT |
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119 return QObject::connect((QObject *)this, SIGNAL(signal(QVariant)), |
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120 receiver, member); |
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121 #endif |
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122 } |
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123 |
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124 /*! |
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125 Disonnects the signal from \a member in object \a receiver. |
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126 Returns true if the connection existed and the disconnect |
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127 was successful. |
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128 |
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129 \sa connect(), QObject::disconnect() |
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130 */ |
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131 |
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132 bool Q3Signal::disconnect(const QObject *receiver, const char *member) |
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133 { |
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134 if (!member) |
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135 return QObject::disconnect((QObject *)this, 0, receiver, member); |
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136 #ifndef QT_NO_VARIANT |
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137 if (intSignature(member)) |
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138 #endif |
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139 return QObject::disconnect((QObject *)this, SIGNAL(intSignal(int)), receiver, member); |
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140 #ifndef QT_NO_VARIANT |
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141 return QObject::disconnect((QObject *)this, SIGNAL(signal(QVariant)), |
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142 receiver, member); |
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143 #endif |
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144 } |
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145 |
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146 |
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147 /*! |
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148 \fn bool Q3Signal::isBlocked() const |
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149 \obsolete |
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150 Returns true if the signal is blocked, or false if it is not blocked. |
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151 |
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152 The signal is not blocked by default. |
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153 |
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154 \sa block(), QObject::signalsBlocked() |
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155 */ |
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156 |
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157 /*! |
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158 \fn void Q3Signal::block(bool b) |
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159 \obsolete |
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160 Blocks the signal if \a b is true, or unblocks the signal if \a b is false. |
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161 |
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162 An activated signal disappears into hyperspace if it is blocked. |
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163 |
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164 \sa isBlocked(), activate(), QObject::blockSignals() |
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165 */ |
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166 |
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167 |
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168 /*! |
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169 \fn void Q3Signal::activate() |
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170 |
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171 Emits the signal. If the platform supports QVariant and a |
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172 parameter has been set with setValue(), this value is passed in |
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173 the signal. |
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174 */ |
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175 void Q3Signal::activate() |
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176 { |
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177 #ifndef QT_NO_VARIANT |
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178 /* Create this Q3GuardedPtr on this, if we get destroyed after the intSignal (but before the variant signal) |
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179 we cannot just emit the signal (because val has been destroyed already) */ |
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180 QPointer<Q3Signal> me = this; |
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181 if(me) |
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182 emit intSignal(val.toInt()); |
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183 if(me) |
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184 emit signal(val); |
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185 #else |
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186 emit intSignal(0); |
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187 #endif |
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188 } |
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189 |
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190 #ifndef QT_NO_VARIANT |
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191 /*! |
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192 Sets the signal's parameter to \a value |
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193 */ |
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194 void Q3Signal::setValue(const QVariant &value) |
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195 { |
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196 val = value; |
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197 } |
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198 |
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199 /*! |
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200 Returns the signal's parameter |
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201 */ |
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202 QVariant Q3Signal::value() const |
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203 { |
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204 return val; |
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205 } |
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206 /*! \fn void Q3Signal::signal(const QVariant &) |
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207 \internal |
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208 */ |
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209 /*! \fn void Q3Signal::intSignal(int) |
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210 \internal |
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211 */ |
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212 |
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213 /*! \obsolete */ |
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214 void Q3Signal::setParameter(int value) |
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215 { |
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216 val = value; |
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217 } |
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218 |
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219 /*! \obsolete */ |
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220 int Q3Signal::parameter() const |
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221 { |
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222 return val.toInt(); |
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223 } |
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224 #endif //QT_NO_VARIANT |
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225 |
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226 QT_END_NAMESPACE |