CheckboxTreeViewer on checked Children node get Parent node value

Question

I am using JFace CheckboxTreeViewer and adding on ICheckStateListener to get checked elemets,

My CheckboxTreeViewer structure is as follows,

P1
 ----Child1
 ----Child2
 ----Child3
 ----Child4
P2
 ----Child6
 ----Child7
 ----Child8
 ----Child9

My Requirement is that when I am checked a Children node to get its Related parent node

for example

when I checked Child8 then get Parent Node p2 when I checked Child2 then get Parent Node p1

how to achieve this?

Answer 1

You get the element that has changed from the CheckStateChangedEvent passed to the listener by calling the getElement method:

public void checkStateChanged(CheckStateChangedEvent event) {

  Object changed = event.getElement();

This is the object that your tree content provider provided. So you can get its parent by asking the content provider:

  ITreeContentProvider provider = (ITreeContentProvider)viewer.getContentProvider();

  Object parent = provider.getParent(changed);

where viewer is the CheckboxTreeViewer.