com.google.gwt.visualization.client.events.RangeChangeHandler.java Source code

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Here is the source code for com.google.gwt.visualization.client.events.RangeChangeHandler.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * 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 com.google.gwt.visualization.client.events;

import com.google.gwt.ajaxloader.client.Properties;

import java.util.Date;

/**
 * This class handles range events for visualizations such as AnnotatedTimeLine.
 */
public abstract class RangeChangeHandler extends Handler {
    /**
     * This event is fired when the user changes the date range of the
     * visualization.
     */
    public class RangeChangeEvent {
        private Date end;
        private Date start;

        public RangeChangeEvent(Date start, Date end) {
            this.start = start;
            this.end = end;
        }

        public Date getEnd() {
            return end;
        }

        public Date getStart() {
            return start;
        }
    }

    public abstract void onRangeChange(RangeChangeEvent event);

    @Override
    protected void onEvent(Properties properties) throws Properties.TypeException {
        Date start = properties.getDate("start");
        Date end = properties.getDate("end");
        onRangeChange(new RangeChangeEvent(start, end));
    }
}