vaadin-framework/src/com/vaadin/terminal/gwt/client/ui/dd/VTargetNodeIsChildOf.java

/**
 * 
 */
package com.vaadin.terminal.gwt.client.ui.dd;

import com.google.gwt.user.client.ui.Widget;
import com.vaadin.terminal.gwt.client.UIDL;
import com.vaadin.terminal.gwt.client.ui.VTree;
import com.vaadin.terminal.gwt.client.ui.VTree.TreeNode;

final public class VTargetNodeIsChildOf extends VAcceptCriterion {

    @Override
    public boolean validates(VDragEvent drag, UIDL configuration) {

        VTree tree = (VTree) VDragAndDropManager.get().getCurrentDropHandler()
                .getPaintable();
        TreeNode treeNode = tree.getNodeByKey((String) drag.getDropDetails()
                .get("itemIdOver"));
        if (treeNode != null) {
            Widget parent2 = treeNode.getParent().getParent();
            int depth = configuration.getIntAttribute("depth");
            if (depth < 0) {
                depth = Integer.MAX_VALUE;
            }
            for (int i = 0; i < depth && parent2 instanceof TreeNode; i++) {
                if (configuration.getStringAttribute("key").equals(
                        ((TreeNode) parent2).key)) {
                    return true;
                }
                parent2 = parent2.getParent().getParent();
            }
        }

        return false;
    }
}