Geek asks and answers

How to fire setData event programmatically on SWT tree in VIRTUAL mode

Is it possible to fire the setData event programmatically on the SWT tree in VIRTUAL mode?

+3
source share
3 answers

The method notifyListenersin Widget does this.

tree.notifyListeners(SWT.SetData, <EventData>)

However, you must create and pass the correct event.

+1
source

I would just like to complement the Fabian Zeindl answer that worked for me if this additional information is useful to someone.

SWT.VIRTUAL TreeItem . TreeViewer, TreeItem, viewer.setSelection().
, TreeItem.

:

final Tree treeViewerTree = treeViewer.getTree();
// we now assume that the indexOfElementToSelect value is set to a correct value (which is a lower value than treeViewerTree.getItemCount()!!)
TreeItem treeItem = treeViewerTree.getItem(indexOfElementToSelect);
final boolean isVirtualTree = (treeViewerTree.getStyle() & SWT.VIRTUAL) != 0;
if(isVirtualTree) {
    // trigger SWT.SetData event programmatically on SWT tree in VIRTUAL mode which loads the item explicitly
    Event virtualTreeEvent = new Event();
    virtualTreeEvent.index = indexOfElementToSelect;
    virtualTreeEvent.item = treeItem;
    // triggering SWT.SetData programmatically
    treeViewerTree.notifyListeners(SWT.SetData, virtualTreeEvent);
}

treeViewer.setSelection(new StructuredSelection(........), true);
+1

Sam Zheng, two years on the road, I certainly hope you find your answer, but here it is for other truth seekers:

Use methods for Tree.clear(index,boolean)either Tree.clearAll(boolean)root level elements and methods TreeItem.clear(index,boolean)or TreeItem.clear(boolean)for elements under the root.

0
source

More articles: