TVM_DELETEITEM - deletes children or updates .cchildren of parent

[Bern Ertl]

The MSDN docs are not very clear on what happens when deleting a node that isn't the root. Does this delete all children and/or update the .cchildren count of the parent node?

[Michael Mattias]

TVM_DELETEITEM deletes the node and all its children.

There is no such thing as a 'cChildren' variable. When you request a child count in TVITEM using TVM_GETITEM, you will get the current child count.

MCM

[Bern Ertl]

Thanks Michael. It was my understanding that the TVITEM.cChildren value for a node could be manipulated to force the display of the + button even when no children had been inserted into the TreeView, so I wasn't sure if the TreeView control was really updating/maintaining this or if it was on the user to maintain it.

[Michael Mattias]

You may need to force a redraw after deleting the last child of a particular node to get the display to show 'current condition' but that's hardly front-page news.

[Bern Ertl]

Good thing there are discussion forums where people who don't read the news can ask questions from those who do.