eml.studio.client.ui.tree.BaseTree.java Source code

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Here is the source code for eml.studio.client.ui.tree.BaseTree.java

Source

/**
 * Copyright 2017 Institute of Computing Technology, Chinese Academy of Sciences.
 * Licensed under the terms of the Apache 2.0 license.
 * Please see LICENSE file in the project root for terms
 */
package eml.studio.client.ui.tree;

import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;

/**
 * The basic class for menu tree
 */
public abstract class BaseTree extends Tree {

    public BaseTree() {
        super(new TreeImageResources(), true);

        this.addStyleName("bda-treedir");

        this.addSelectionHandler(new SelectionHandler<TreeItem>() {
            @Override
            public void onSelection(SelectionEvent<TreeItem> event) {
                TreeItem item = event.getSelectedItem();
                Boolean state = item.getState();
                // [GWT Issue 3660] to avoid pass invoke onSection two times
                TreeItem parent = item.getParentItem();
                item.getTree().setSelectedItem(parent, false);
                if (parent != null)
                    parent.setSelected(false);
                item.setState(!state);
            }
        });
    }
}