Expanding tree nodes

Question

I am new to eclipse RCP, well as a matter of fact to java also. Have a very basic question. I have a JFace TreeViewer. I want to expand a particular node in that. The catch is I only have the name of the node. and no information apart from that. I tried using treeItem, compared its string with that of the node name that I have, thus I got the node. I tried expanding it in the contentprovider of the tree. But i am not getting the desired output. When I check it in the log i get that it is expanded but it doesnt show in the viewer. I am performing this in display.asyncExec method in the contentprovider.

I hope the question is clear.

Answer 1

JFace viewers were created so that developers wouldn't have to mess around with SWT widgets and could use higher level API instead. When using JFace's viewer/content provider/label provider you should be in control of what nodes are in your tree (thus when you say you only know the name, I assume you are using SWT Tree directly). You can read about JFace viewers from Eclipse help.

To expand a tree node use expandToLevel(Object elementOrTreePath, int level) method of TreeViewer (the level is relative to the node that is expanded, not the root of the tree).