org.geowe.client.local.style.SimpleThemingVerticalLegend.java Source code

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Here is the source code for org.geowe.client.local.style.SimpleThemingVerticalLegend.java

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/*
 * #%L
 * GeoWE Project
 * %%
 * Copyright (C) 2015 - 2016 GeoWE.org
 * %%
 * This file is part of GeoWE.org.
 * 
 * GeoWE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * GeoWE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GeoWE.  If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */
package org.geowe.client.local.style;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.geowe.client.local.main.map.VerticalLegend;
import org.geowe.client.local.model.vector.VectorLayer;
import org.gwtopenmaps.openlayers.client.feature.VectorFeature;

import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;

/**
 * A Simple vertical legend based on attribute theming
 * 
 * @author rafa@geowe.org
 *
 */
public class SimpleThemingVerticalLegend extends VerticalLegend {

    private final String attributeName;
    private final VectorLayer selectedLayer;

    public SimpleThemingVerticalLegend(VectorLayer selectedLayer, String attributeName) {
        super();
        this.attributeName = attributeName;
        this.selectedLayer = selectedLayer;
        create();
    }

    @Override
    protected List<Widget> getData() {

        Map<String, String> attrColorMap = createAttributeColorMap();
        List<Widget> widgets = new ArrayList<Widget>();
        for (Entry<String, String> attr : attrColorMap.entrySet()) {
            HorizontalPanel hpanel = new HorizontalPanel();
            hpanel.setSpacing(2);
            hpanel.add(getColorPanel(attr.getValue()));
            hpanel.add(new Label(attr.getKey()));

            widgets.add(hpanel);
        }
        return widgets;
    }

    @Override
    protected HTML getHeader() {
        return new HTML(selectedLayer.getName() + "<br><b>" + attributeName + "</b><hr><hr>");
    }

    private Map<String, String> createAttributeColorMap() {
        Map<String, String> attrColorMap = new HashMap<String, String>();
        for (VectorFeature feature : selectedLayer.getFeatures()) {
            String attrValue = "" + feature.getAttributes().getAttributeAsString(attributeName);
            attrColorMap.put(attrValue, StyleFactory.stringToColour(attrValue));
        }
        return attrColorMap;
    }

    private HorizontalPanel getColorPanel(String color) {
        HorizontalPanel colorPanel = new HorizontalPanel();
        colorPanel.setSize("20px", "20px");
        colorPanel.getElement().getStyle().setBackgroundColor(color);
        colorPanel.getElement().getStyle().setBorderColor(color);
        return colorPanel;
    }
}