es.upm.fi.dia.oeg.map4rdf.client.widget.Timeline.java Source code

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Here is the source code for es.upm.fi.dia.oeg.map4rdf.client.widget.Timeline.java

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/**
 * Copyright (c) 2011 Ontology Engineering Group, 
 * Departamento de Inteligencia Artificial,
 * Facultad de Informetica, Universidad 
 * Politecnica de Madrid, Spain
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package es.upm.fi.dia.oeg.map4rdf.client.widget;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;

import com.google.gwt.user.client.ui.SimplePanel;

import es.upm.fi.dia.oeg.map4rdf.share.Year;

/**
 * @author Alexander De Leon
 */
public class Timeline extends SimplePanel implements HasValueChangeHandlers<Year> {

    public interface Stylesheet {
        String timeline();
    }

    private List<Year> sortedYears;
    private SliderBar slider;

    public Timeline(Stylesheet stylesheet) {
        addStyleName(stylesheet.timeline());
    }

    public void setYears(Collection<Year> years) {
        sortedYears = sortYears(years);
        if (slider != null) {
            remove(slider);
        }
        slider = createSlider(years.size());
        setWidget(slider);
        setVisible(true);
    }

    public void hide() {
        setVisible(false);
    }

    @Override
    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<Year> handler) {
        return addHandler(handler, ValueChangeEvent.getType());
    }

    public void setCurrentValue(Year year, boolean fireEvent) {
        setCurrentValue(Collections.binarySearch(sortedYears, year, new YearComparator()), fireEvent);
    }

    public void setCurrentValue(int index, boolean fireEvent) {
        slider.setCurrentValue(index, fireEvent);
    }

    @Override
    protected void onLoad() {
        super.onLoad();
    }

    private SliderBar createSlider(int years) {
        SliderBar slider = new SliderBar(0, years - 1, new SliderBar.LabelFormatter() {
            @Override
            public String formatLabel(SliderBar slider, double value) {
                long pos = Math.round(value);
                return Integer.toString(sortedYears.get((int) pos).getValue());
            }
        });
        slider.setStepSize(1.0);
        slider.setNumTicks(years);
        slider.setNumLabels(years);
        slider.setWidth((years * 5) + "em");

        bindEvents(slider);

        return slider;
    }

    private void bindEvents(SliderBar slider) {
        slider.addValueChangeHandler(new ValueChangeHandler<Double>() {
            @Override
            public void onValueChange(ValueChangeEvent<Double> event) {
                double val = event.getValue();
                double intVal = Math.floor(val);
                ValueChangeEvent.fire(Timeline.this, sortedYears.get((int) intVal));
            }
        });

    }

    private List<Year> sortYears(Collection<Year> years) {
        List<Year> list = new ArrayList<Year>(years);
        Collections.sort(list, new YearComparator());
        return list;
    }

    private static class YearComparator implements Comparator<Year> {
        @Override
        public int compare(Year o1, Year o2) {
            return o1.getValue().compareTo(o2.getValue());
        }
    }
}