如何在Java中使用三态复选框/ TreeItem？

Question

Env: Java SE 6

I am working on an Eclipse RCP application. How do I create TreeItems with tri-state checkbox. Like the Eclipse IDE update package interface. I use SWT TreeItem class now, which only provides API, setChecked(bool), for true/false states.

Answer 1

The filled in check box is known as 'grayed'.

With CheckboxTreeViewer use the setGrayed , setGrayChecked , setGrayedElements methods to set grayed items.

With TreeItem use the setGrayed method.

It is up to you to code the logic for determining when a node should be grayed.