n3phele.client.widgets.MainMenuTreeViewModel.java Source code

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Here is the source code for n3phele.client.widgets.MainMenuTreeViewModel.java

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/**
 * @author Nigel Cook
 *
 * (C) Copyright 2010-2012. Nigel Cook. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Licensed under the terms described in LICENSE file that accompanied this code, (the "License"); you may not use this file
 * except in compliance with the License. 
 * 
 *  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on 
 *  an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 *  specific language governing permissions and limitations under the License.
 */
package n3phele.client.widgets;

import java.util.List;

import com.google.gwt.user.client.History;
import com.google.gwt.view.client.ListDataProvider;
import com.google.gwt.view.client.SelectionChangeEvent;
import com.google.gwt.view.client.SelectionChangeEvent.Handler;
import com.google.gwt.view.client.SingleSelectionModel;
import com.google.gwt.view.client.TreeViewModel;

public class MainMenuTreeViewModel implements TreeViewModel {

    private final SingleSelectionModel<MenuItem> selectionModel;
    private final ListDataProvider<MenuItem> dataProvider;

    public MainMenuTreeViewModel(List<MenuItem> list) {
        this.selectionModel = new SingleSelectionModel<MenuItem>();
        this.dataProvider = new ListDataProvider<MenuItem>(list);
        this.selectionModel.addSelectionChangeHandler(new Handler() {

            @Override
            public void onSelectionChange(SelectionChangeEvent event) {
                MenuItem item = MainMenuTreeViewModel.this.selectionModel.getSelectedObject();
                if (item != null && item.getPlaceToken() != null) {
                    History.newItem(item.getPlaceToken());
                }
            }
        });

    }

    @Override
    public <T> NodeInfo<?> getNodeInfo(T value) {
        if (value == null) {

            return new DefaultNodeInfo<MenuItem>(dataProvider, new IconTextCell<MenuItem>(20, 20), selectionModel,
                    null);
            //      } else if(value instanceof TypeThatHasChildren) {
            /* Need a composite for the renderer that combines a small icon and a string */
            //         return new DefaultNodeInfo<String>(dataProvider, new TextCell());
            /* If a component has children, we return a list of them here */
        } else
            return null;

    }

    @Override
    public boolean isLeaf(Object value) {
        if (value == null)
            return false;
        if (value instanceof MenuItem) {
            return false;
        }
        return false;
    }

    public SingleSelectionModel<MenuItem> getSelectionModel() {
        return this.selectionModel;
    }
}