eu.riscoss.client.layers.LayersComboBox.java Source code

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Here is the source code for eu.riscoss.client.layers.LayersComboBox.java

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/*
   (C) Copyright 2013-2016 The RISCOSS Project Consortium
       
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
    
 http://www.apache.org/licenses/LICENSE-2.0
    
   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.
    
*/

/**
 * @author    Alberto Siena
**/

package eu.riscoss.client.layers;

import org.fusesource.restygwt.client.JsonCallback;
import org.fusesource.restygwt.client.Method;

import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONValue;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.Widget;

import eu.riscoss.client.RiscossCall;
import eu.riscoss.client.RiscossJsonClient;

public class LayersComboBox implements IsWidget {

    ListBox combo = new ListBox();

    void loadLayers() {
        RiscossJsonClient.listLayers(new JsonCallback() {
            @Override
            public void onSuccess(Method method, JSONValue response) {
                for (int i = 0; i < response.isArray().size(); i++) {
                    JSONObject o = (JSONObject) response.isArray().get(i);
                    combo.addItem(o.get("name").isString().stringValue());
                }
            }

            @Override
            public void onFailure(Method method, Throwable exception) {
                Window.alert(exception.getMessage());
            }
        });
    }

    public LayersComboBox preloaded() {
        loadLayers();
        return this;
    }

    @Override
    public Widget asWidget() {
        return combo;
    }

    /**
     * 
     * @return null if none selected
     */
    public String getSelectedLayer() {
        if (combo.getSelectedIndex() >= 0)
            return combo.getItemText(combo.getSelectedIndex());
        return null;
    }

    public void setSelectedLayer(String layer) {
        if (layer == null)
            return;
        for (int i = 0; i < combo.getItemCount(); i++) {
            if (layer.equals(combo.getItemText(i))) {
                combo.setSelectedIndex(i);
            }
        }
    }

}