Java Code Examples for org.eclipse.jface.viewers.CheckStateChangedEvent#getSource()

@Override
public void checkStateChanged(final CheckStateChangedEvent event) {
    FieldToContractInputMapping mapping = (FieldToContractInputMapping) event.getElement();
    mapping.setGenerated(event.getChecked());
    setGeneratedStatePersistenceIdChild(mapping, event.getChecked());
    CheckboxTreeViewer checkboxTreeViewer = (CheckboxTreeViewer) event.getSource();
    checkboxTreeViewer.setSubtreeChecked(mapping, event.getChecked());
    setChildrenChecked(mapping, event.getChecked());
    selectParentIfChildIsSelected(event, mapping, checkboxTreeViewer);
    deselectParentIfNoChildSelected(event, mapping, checkboxTreeViewer);
    checkboxTreeViewer.getControl().getDisplay().asyncExec(() -> checkboxTreeViewer.refresh());
}
 

/**
 * This method is called when one of the nodes in the tree is checked. For
 * MOOSE trees, this must enforce two rules:
 * <ul>
 * <li>When a node is checked, all of its ancestor nodes should be checked.</li>
 * <li>When a node is unchecked, all of its descendant nodes should be
 * unchecked.</li>
 * </ul>
 */
@Override
public void checkStateChanged(CheckStateChangedEvent event) {

	if (event != null && event.getElement() instanceof TreeComposite) {
		// Get the checked/unchecked node.
		TreeViewer treeViewer = (TreeViewer) event.getSource();
		TreeComposite node = (TreeComposite) event.getElement();

		boolean checked = event.getChecked();

		// If checked, all ancestor nodes should also be checked. This is
		// done by setting their active flags.
		if (checked) {
			while (node != null) {
				// If the state of the node changes, we need to tell the
				// TreeViewer to refresh that element.
				if (!node.isActive()) {
					node.setActive(true);
					treeViewer.update(node, null);
				}
				node = node.getParent();
			}
		}

		// Either way, all descendant nodes should have the same check state
		// as the ancestor node when it changes.

		// Get the root node (it may have changed due to the above loop).
		node = (TreeComposite) event.getElement();

		// Get a breadth-first iterator so we can walk the tree.
		Iterator<TreeComposite> iterator;
		iterator = new BreadthFirstTreeCompositeIterator(node);
		// Loop over and deactivate the children.
		while (iterator.hasNext()) {
			node = iterator.next();
			// If the state of the node changes, we need to tell the
			// TreeViewer to refresh that element.
			if (node.isActive() != checked) {
				node.setActive(checked);
				treeViewer.update(node, null);
			}
		}
	}

	return;
}