QTreeWidgetItem 点击可编辑修改

enum Qt::ItemFlag

flags Qt::ItemFlags

This enum describes the properties of an item:

Constant	Value	Description
Qt::NoItemFlags	0	It does not have any properties set.
Qt::ItemIsSelectable	1	It can be selected.
Qt::ItemIsEditable	2	It can be edited.
Qt::ItemIsDragEnabled	4	It can be dragged.
Qt::ItemIsDropEnabled	8	It can be used as a drop target.
Qt::ItemIsUserCheckable	16	It can be checked or unchecked by the user.
Qt::ItemIsEnabled	32	The user can interact with the item.
Qt::ItemIsTristate	64	The item is checkable with three separate states.

Note that checkable items need to be given both a suitable set of flags and an initial state, indicating whether the item is checked or not. This is handled automatically for model/view components, but needs to be explicitly set for instances of QListWidgetItem,QTableWidgetItem,
and QTreeWidgetItem.

The ItemFlags type is a typedef for QFlags<ItemFlag>. It stores an OR combination of ItemFlag values.

注意最后一句，ItemFlags存储的是几个ItemFlag的逻辑或的结果。

所以设置某个Item可编辑时，可以item->setFlags(Qt::ItemIsEditable |Qt::ItemIsEnabled);