package de.intevation.flys.client.client.ui;

import java.util.LinkedHashMap;

import com.google.gwt.core.client.GWT;

import com.smartgwt.client.types.VerticalAlignment;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.ComboBoxItem;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

import de.intevation.flys.client.shared.model.Data;
import de.intevation.flys.client.shared.model.DataItem;
import de.intevation.flys.client.shared.model.DefaultData;
import de.intevation.flys.client.shared.model.DefaultDataItem;

import de.intevation.flys.client.client.FLYSMessages;


/**
 * This UIProvider displays the DataItems of the Data object in a combo box.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class SelectProvider
extends      AbstractUIProvider
{
    /** The message class that provides i18n strings.*/
    protected FLYSMessages messages = GWT.create(FLYSMessages.class);

    /** The combobox.*/
    protected ComboBoxItem combobox;

    /** The name of the data object.*/
    protected String dataName;


    /**
     * This method currently returns a
     * {@link com.smartgwt.client.widgets.form.DynamicForm} that contains all
     * data items in a combobox stored in <i>data</i>.
     *
     * @param data The {@link Data} object.
     *
     * @return a combobox.
     */
    public Canvas create(Data data) {
        dataName = data.getLabel();

        VLayout v = new VLayout();

        Canvas content = createWidget(data);

        IButton button = new IButton(messages.next(), this);

        v.addMember(content);
        v.addMember(button);

        return v;
    }


    /**
     * This method creates the content of the widget.
     *
     * @param data The {@link Data} object.
     *
     * @return a combobox.
     */
    protected Canvas createWidget(Data data) {
        GWT.log("SelectProvider - create()");

        HLayout layout   = new HLayout();
        Label label      = new Label(data.getDescription());
        DynamicForm form = new DynamicForm();
        combobox         = new ComboBoxItem(data.getLabel());

        LinkedHashMap<String, String> it = new LinkedHashMap<String, String>();

        for (DataItem item: data.getItems()) {
            it.put(item.getStringValue(), item.getLabel());
        }

        label.setWidth(50);
        combobox.setValueMap(it);
        combobox.setShowTitle(false);
        form.setItems(combobox);

        layout.addMember(label);
        layout.addMember(form);

        label.setValign(VerticalAlignment.TOP);
        layout.setAlign(VerticalAlignment.TOP);

        return layout;
    }


    protected Data[] getData() {
        String selection = combobox.getValueAsString();
        DataItem item    = new DefaultDataItem(dataName, null, selection);

        return new Data[] { new DefaultData(
            dataName, null, null, new DataItem[] { item }, null) };
    }
}
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