单击该行时，设置CheckboxTreeViewer的复选框

Question

I'm looking for a generic approach to check the checkbox of CheckBoxTreeViewer, when the row / the item is selected. I've found a similar question regarding the CheckBoxTableViewer, which answer helped me, but it doesn't apply to the CheckBoxTreeViewer. I assume, I have to use the ISelectionChangedListener.

Answer 1

You can add an ISelectionChangedListener and receive the selected object from the SelectionChangedEvent. Then you can set the checked state for this object like this:

viewer.addSelectionChangedListener(new ISelectionChangedListener() {
        @Override
        public void selectionChanged(SelectionChangedEvent event) {
            Object selection = ((StructuredSelection)event.getSelection()).getFirstElement();
            viewer.setChecked(selection, true);
        }
    });

Answer 2

I solved the problem with the grayed state by calling the CheckStateListener, which is responsible to maintain the checked and grayed state of the elements.

public void selectionChanged(final SelectionChangedEvent event) {
    Object selection = ((StructuredSelection) event.getSelection()).getFirstElement();
    if (selection != null) {
        boolean state = !checkboxTreeViewer.getChecked(selection);
        checkboxTreeViewer.setChecked(selection, state);
        checkboxTreeViewer.setSelection(StructuredSelection.EMPTY);
        checkStateListener.checkStateChanged(new CheckStateChangedEvent((ICheckable) event.getSource(), selection,
            state));
    }

}