/**
* Sets the checked state for the given element and its visible children in this viewer. Assumes
* that the element has been expanded before. To enforce that the item is expanded, call <code>
* expandToLevel</code> for the element. Does not fire events to check state listeners.
*
* @param element the element
* @param state <code>true</code> if the item should be checked, and <code>false</code> if it
* should be unchecked
* @return <code>true</code> if the checked state could be set, and <code>false</code> otherwise
*/
public boolean setSubtreeChecked(Object element, boolean state) {
Widget widget = internalExpand(element, false);
if (widget instanceof TreeItem) {
TreeItem item = (TreeItem) widget;
item.setChecked(state);
setCheckedChildren(item, state);
return true;
}
return false;
}
/**
* Sets the checked state for the children of the given item.
*
* @param item the item
* @param state <code>true</code> if the item should be checked, and <code>false</code> if it
* should be unchecked
*/
private void setCheckedChildren(Item item, boolean state) {
createChildren(item);
Item[] items = getChildren(item);
if (items != null) {
for (int i = 0; i < items.length; i++) {
Item it = items[i];
if (it.getData() != null && (it instanceof TreeItem)) {
TreeItem treeItem = (TreeItem) it;
treeItem.setChecked(state);
setCheckedChildren(treeItem, state);
}
}
}
}