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qobjectcleanuphandler.cpp

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1 /**************************************************************************** -

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4 ** Contact: https://www.qt.io/licensing/ -

5 ** -

6 ** This file is part of the QtCore module of the Qt Toolkit. -

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8 ** $QT_BEGIN_LICENSE:LGPL$ -

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38 ****************************************************************************/ -

39 -

40 #include "qobjectcleanuphandler.h" -

41 -

42 QT_BEGIN_NAMESPACE -

43 -

44 /*! -

45 \class QObjectCleanupHandler -

46 \inmodule QtCore -

47 \brief The QObjectCleanupHandler class watches the lifetime of multiple QObjects. -

48 -

49 \ingroup objectmodel -

50 -

51 A QObjectCleanupHandler is useful whenever you need to know when a -

52 number of \l{QObject}s that are owned by someone else have been -

53 deleted. This is important, for example, when referencing memory -

54 in an application that has been allocated in a shared library. -

55 -

56 To keep track of some \l{QObject}s, create a -

57 QObjectCleanupHandler, and add() the objects you are interested -

58 in. If you are no longer interested in tracking a particular -

59 object, use remove() to remove it from the cleanup handler. If an -

60 object being tracked by the cleanup handler gets deleted by -

61 someone else it will automatically be removed from the cleanup -

62 handler. You can delete all the objects in the cleanup handler -

63 with clear(), or by destroying the cleanup handler. isEmpty() -

64 returns \c true if the QObjectCleanupHandler has no objects to keep -

65 track of. -

66 -

67 \sa QPointer -

68 */ -

69 -

70 /*! -

71 Constructs an empty QObjectCleanupHandler. -

72 */ -

73 QObjectCleanupHandler::QObjectCleanupHandler() -

74 { -

75 } -

76 -

77 /*! -

78 Destroys the cleanup handler. All objects in this cleanup handler -

79 will be deleted. -

80 -

81 \sa clear() -

82 */ -

83 QObjectCleanupHandler::~QObjectCleanupHandler() -

84 { -

85 clear(); -

}

never executed: end of block

87 -

88 /*! -

89 Adds \a object to this cleanup handler and returns the pointer to -

90 the object. -

91 -

92 \sa remove() -

93 */ -

94 QObject *QObjectCleanupHandler::add(QObject* object) -

95 { -

if (!object)

!object	Description
TRUE	never evaluated
FALSE	never evaluated

return 0;

never executed: return 0;

98 -

99 connect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*))); -

100 cleanupObjects.insert(0, object); -

101

return object;

never executed: return object;

102 } -

103 -

104 /*! -

105 Removes the \a object from this cleanup handler. The object will -

106 not be destroyed. -

107 -

108 \sa add() -

109 */ -

110 void QObjectCleanupHandler::remove(QObject *object) -

111 { -

112 int index; -

113

if ((index = cleanupObjects.indexOf(object)) != -1) {

(index = clean...object)) != -1	Description
TRUE	never evaluated
FALSE	never evaluated

114 cleanupObjects.removeAt(index); -

115 disconnect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*))); -

116

}

never executed: end of block

117

}

never executed: end of block

118 -

119 /*! -

120 Returns \c true if this cleanup handler is empty or if all objects in -

121 this cleanup handler have been destroyed; otherwise return false. -

122 -

123 \sa add(), remove(), clear() -

124 */ -

125 bool QObjectCleanupHandler::isEmpty() const -

126 { -

127

return cleanupObjects.isEmpty();

never executed: return cleanupObjects.isEmpty();

128 } -

129 -

130 /*! -

131 Deletes all objects in this cleanup handler. The cleanup handler -

132 becomes empty. -

133 -

134 \sa isEmpty() -

135 */ -

136 void QObjectCleanupHandler::clear() -

137 { -

138

while (!cleanupObjects.isEmpty())

!cleanupObjects.isEmpty()	Description
TRUE	never evaluated
FALSE	never evaluated

139

delete cleanupObjects.takeFirst();

never executed: delete cleanupObjects.takeFirst();

140

}

never executed: end of block

141 -

142 void QObjectCleanupHandler::objectDestroyed(QObject *object) -

143 { -

144 remove(object); -

145

}

never executed: end of block

146 -

147 QT_END_NAMESPACE -

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