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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 QtCore 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 #ifndef QDECLARATIVEGUARD_P_H |
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43 #define QDECLARATIVEGUARD_P_H |
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44 |
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45 // |
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46 // W A R N I N G |
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47 // ------------- |
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48 // |
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49 // This file is not part of the Qt API. It exists for the convenience |
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50 // of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header |
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51 // file may change from version to version without notice, or even be removed. |
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52 // |
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53 // We mean it. |
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54 // |
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55 |
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56 #include <QtCore/qglobal.h> |
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57 #include <QtCore/qvariant.h> |
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58 |
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59 QT_BEGIN_NAMESPACE |
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60 |
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61 class QObject; |
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62 template<class T> |
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63 class QDeclarativeGuard |
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64 { |
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65 QObject *o; |
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66 QDeclarativeGuard<QObject> *next; |
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67 QDeclarativeGuard<QObject> **prev; |
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68 friend class QDeclarativeData; |
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69 public: |
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70 inline QDeclarativeGuard(); |
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71 inline QDeclarativeGuard(T *); |
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72 inline QDeclarativeGuard(const QDeclarativeGuard<T> &); |
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73 inline virtual ~QDeclarativeGuard(); |
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74 |
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75 inline QDeclarativeGuard<T> &operator=(const QDeclarativeGuard<T> &o); |
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76 inline QDeclarativeGuard<T> &operator=(T *); |
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77 |
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78 inline bool isNull() const |
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79 { return !o; } |
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80 |
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81 inline T* operator->() const |
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82 { return static_cast<T*>(const_cast<QObject*>(o)); } |
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83 inline T& operator*() const |
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84 { return *static_cast<T*>(const_cast<QObject*>(o)); } |
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85 inline operator T*() const |
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86 { return static_cast<T*>(const_cast<QObject*>(o)); } |
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87 inline T* data() const |
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88 { return static_cast<T*>(const_cast<QObject*>(o)); } |
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89 |
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90 protected: |
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91 virtual void objectDestroyed(T *) {} |
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92 |
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93 private: |
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94 inline void addGuard(); |
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95 inline void remGuard(); |
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96 }; |
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97 |
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98 QT_END_NAMESPACE |
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99 |
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100 Q_DECLARE_METATYPE(QDeclarativeGuard<QObject>) |
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101 |
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102 #include "private/qdeclarativedata_p.h" |
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103 |
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104 QT_BEGIN_NAMESPACE |
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105 |
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106 template<class T> |
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107 QDeclarativeGuard<T>::QDeclarativeGuard() |
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108 : o(0), next(0), prev(0) |
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109 { |
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110 } |
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111 |
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112 template<class T> |
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113 QDeclarativeGuard<T>::QDeclarativeGuard(T *g) |
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114 : o(g), next(0), prev(0) |
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115 { |
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116 if (o) addGuard(); |
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117 } |
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118 |
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119 template<class T> |
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120 QDeclarativeGuard<T>::QDeclarativeGuard(const QDeclarativeGuard<T> &g) |
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121 : o(g.o), next(0), prev(0) |
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122 { |
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123 if (o) addGuard(); |
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124 } |
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125 |
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126 template<class T> |
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127 QDeclarativeGuard<T>::~QDeclarativeGuard() |
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128 { |
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129 if (prev) remGuard(); |
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130 o = 0; |
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131 } |
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132 |
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133 template<class T> |
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134 QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(const QDeclarativeGuard<T> &g) |
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135 { |
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136 if (g.o != o) { |
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137 if (prev) remGuard(); |
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138 o = g.o; |
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139 if (o) addGuard(); |
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140 } |
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141 return *this; |
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142 } |
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143 |
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144 template<class T> |
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145 QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(T *g) |
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146 { |
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147 if (g != o) { |
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148 if (prev) remGuard(); |
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149 o = g; |
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150 if (o) addGuard(); |
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151 } |
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152 return *this; |
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153 } |
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154 |
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155 QT_END_NAMESPACE |
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156 |
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157 #endif // QDECLARATIVEGUARD_P_H |