org.rebioma.client.maps.TileLayerLegend.java Source code

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Here is the source code for org.rebioma.client.maps.TileLayerLegend.java

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/*
 * Copyright 2008 University of California at Berkeley
 * 
 * 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.
 */
package org.rebioma.client.maps;

import com.google.gwt.maps.client.base.LatLng;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.Widget;

public abstract class TileLayerLegend extends HTMLPanel {

    public interface LegendCallback {
        public void onLookup(LatLng point, String value);
    }

    protected DialogBox details;

    public TileLayerLegend() {
        super("");
    }

    protected void addLegend() {
        Widget legendWidget = getLegendWidget();
        this.add(legendWidget);
    }

    public abstract void lookupValue(LatLng point, LegendCallback callback);

    public abstract void setDisplay(LatLng point, String value);

    public void showDetails() {
        if (details == null) {
            details = getDetails();
        }
        details.center();
        details.show();
    }

    protected abstract DialogBox getDetails();

    protected abstract Widget getLegendWidget();
}