/**
* Gathers the checked states of the given widget and its descendents, following a pre-order
* traversal of the tree.
*
* @param result a writable list of elements (element type: <code>Object</code>)
* @param widget the widget
*/
private void internalCollectChecked(List result, Widget widget) {
Item[] items = getChildren(widget);
for (int i = 0; i < items.length; i++) {
Item item = items[i];
if (item instanceof TreeItem && ((TreeItem) item).getChecked()) {
Object data = item.getData();
if (data != null) {
result.add(data);
}
}
internalCollectChecked(result, item);
}
}
/**
* Returns a list of checked elements in this viewer's tree, including currently hidden ones that
* are marked as checked but are under a collapsed ancestor.
*
* <p>This method is typically used when preserving the interesting state of a viewer; <code>
* setCheckedElements</code> is used during the restore.
*
* @return the array of checked elements
* @see #setCheckedElements
*/
public Object[] getCheckedElements() {
ArrayList v = new ArrayList();
Control tree = getControl();
internalCollectChecked(v, tree);
return v.toArray();
}