PyQt（Python+Qt）学习随笔：QTreeWidget的topLevelItemCount属性

QTreeWidget的topLevelItemCount属性是一个只读属性，用于保存树型部件中顶层项的个数，可以通过topLevelItemCount（）方法获取属性值，缺省值为0。

当树型部件中顶层项的数目变化时，topLevelItemCount自动跟随变化。

案例：

 def initTopItems(self):
       cdriver = QtWidgets.QTreeWidgetItem(1,2,["c:\","NTFS","10G"])
       ddriver = QtWidgets.QTreeWidgetItem(["d:\","NTFS","20G"])
       edriver = QtWidgets.QTreeWidgetItem(["e:\","NTFS","30G"])
       print("1.self.treeWidget.topcount=", self.treeWidget.topLevelItemCount())
       self.treeWidget.addTopLevelItem(cdriver)
       print( "2.self.treeWidget.topcount=",self.treeWidget.topLevelItemCount())
       self.treeWidget.addTopLevelItem(ddriver)
       print("3.self.treeWidget.topcount=", self.treeWidget.topLevelItemCount())
       self.treeWidget.addTopLevelItem(edriver)
       print("4.self.treeWidget.topcount=", self.treeWidget.topLevelItemCount())

案例输出：

1.self.treeWidget.topcount= 0
2.self.treeWidget.topcount= 1
3.self.treeWidget.topcount= 2
4.self.treeWidget.topcount= 3

PyQt（Python+Qt）学习随笔：QTreeWidget的topLevelItemCount属性

案例：

案例输出：

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