C++ 如何在扩展QTreeWidgetItem而不是QTreeWidget上调用插槽？

我的类位于TaskGenJob.h，其中TaskGenModel继承自QObject：-

TaskGenJob.h 在我的TaskGenJob.cpp文件中，我尝试将QTreeWidgetItem的信号连接到updateValue，如下所示

但我得到以下错误：-

/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:204:17: note:   no known conversion for argument 1 from 'QTreeWidgetItem*' to 'const QObject*'
/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:217:17: note: static bool QObject::connect(const QObject*, const QMetaMethod&, const QObject*, const QMetaMethod&, Qt::ConnectionType)
     static bool connect(const QObject *sender, const QMetaMethod &signal,
                 ^
/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:217:17: note:   no known conversion for argument 1 from 'QTreeWidgetItem*' to 'const QObject*'
/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:337:13: note: bool QObject::connect(const QObject*, const char*, const char*, Qt::ConnectionType) const
 inline bool QObject::connect(const QObject *asender, const char *asignal,

错误是因为QTreeWidgetItem不从QObject继承，并且没有SIGNALitemExpandedQTreeWidgetItem*。 在应用程序的GUI中，我有1个QTreeWideget和数千个QTreeWideGetItem子项。我可以找到这些孩子的指针。要求是我必须仅在扩展QTreeWidgetItem子级时调用插槽updateValue。

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如何实现这一点？

正如错误所说，QTreeWidgetItem不是Q对象的子类，也没有任何信号。QTreeWidget具有这些功能，因此请尝试连接它，方法与您在代码段中所做的相同

QTreeWidget:：itemExpanded信号在其任何项展开时发出，而展开的是它的参数中的哪一项

/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:204:17: note:   no known conversion for argument 1 from 'QTreeWidgetItem*' to 'const QObject*'
/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:217:17: note: static bool QObject::connect(const QObject*, const QMetaMethod&, const QObject*, const QMetaMethod&, Qt::ConnectionType)
     static bool connect(const QObject *sender, const QMetaMethod &signal,
                 ^
/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:217:17: note:   no known conversion for argument 1 from 'QTreeWidgetItem*' to 'const QObject*'
/opt/qt_4.8.6/include/linux60_64/gcc48/QtCore/qobject.h:337:13: note: bool QObject::connect(const QObject*, const char*, const char*, Qt::ConnectionType) const
 inline bool QObject::connect(const QObject *asender, const char *asignal,