Question : How to disable a item in the treectrl?

Hi,
I wanna disable a item in the treectrl. But after a search in MSDN, I can't find any answer. The treectrl item state contains no flag for disabling. So how can I do?

Any comment is greatly appreciated.

Lite

Answer : How to disable a item in the treectrl?

The tree control by default does not provide the functionality to disable an item. However, you can achieve that by some customizations.

To make an item non-selectable, you can use the TVN_SELCHANGING and TVN_SELCHANGED notifications.

The first one informs you about a selection change to happen (and you can cancel it), the other one informs you that a selection change just happened.

When designing the behavior, you should make sure that keyboard usage will still be possible. The easiest approach - canceling all selection changes that go to an item that is disabled - will for sure break keyboard usage.

If you also want to change the appearance of the disabled item(s), you should explore the CustomDraw notifications of the tree control

I hope this gives you some point to start, if you need more information just ask.