Examples of org.eclipse.swt.widgets.Tree.addTreeListener()

org.eclipse.swt.widgets.Tree.addTreeListener()

Adds the listener to the collection of listeners who will be notified when an item in the receiver is expanded or collapsed by sending it one of the messages defined in the TreeListener interface. @param listener the listener which should be notified @exception IllegalArgumentException

ERROR_NULL_ARGUMENT - if the listener is null

@exception SWTException

ERROR_WIDGET_DISPOSED - if the receiver has been disposed
ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

@see TreeListener @see #removeTreeListener

                    selectedItem = null;
                }
            }


        });
        tree.addTreeListener(new org.eclipse.swt.events.TreeListener() {
            public void treeExpanded(org.eclipse.swt.events.TreeEvent e) {
                final TreeItem selectedItem = (TreeItem) e.item;
                Boolean isTopLevel = (Boolean) selectedItem.getData(IS_TOP_LEVEL);
                if ((isTopLevel != null) && isTopLevel.booleanValue()) {
                    if (selectedItem.getItemCount() == 1) {

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