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

import java.util.ArrayList;
import java.util.List;

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

import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.layout.HLayout;

import de.intevation.flys.client.client.event.OnMoveEvent;
import de.intevation.flys.client.client.event.OnMoveHandler;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ThemeNavigationPanel extends Canvas {

    public static final int PANEL_MARGIN  = 5;
    public static final int BUTTON_HEIGHT = 20;
    public static final int BUTTON_MARGIN = 5;


    protected List<OnMoveHandler> handlers;


    public ThemeNavigationPanel() {
        this.handlers = new ArrayList<OnMoveHandler>();

        setWidth100();
        setHeight(BUTTON_HEIGHT);
        setMargin(PANEL_MARGIN);

        HLayout layout = new HLayout();
        layout.setWidth100();
        layout.setHeight(BUTTON_HEIGHT);
        layout.setMembersMargin(BUTTON_MARGIN);

        Canvas cu = createButton("CU", OnMoveEvent.TOP);
        Canvas u  = createButton("U", OnMoveEvent.UP);
        Canvas d  = createButton("D", OnMoveEvent.DOWN);
        Canvas cd = createButton("CD", OnMoveEvent.BOTTOM);

        layout.addMember(cu);
        layout.addMember(u);
        layout.addMember(d);
        layout.addMember(cd);

        addChild(layout);
    }


    protected Canvas createButton(final String type, final int moveType) {
        Label b = new Label(type);
        b.setBackgroundColor("#BED730");
        b.setBorder("1px solid black");
        b.setWidth(40);
        b.setHeight(BUTTON_HEIGHT);
        b.setAlign(Alignment.CENTER);

        b.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                fireOnMoveEvent(moveType);
            }
        });

        return b;
    }


    protected void addOnMoveHandler(OnMoveHandler handler) {
        if (handler != null) {
            handlers.add(handler);
        }
    }


    protected void fireOnMoveEvent(int type) {
        OnMoveEvent event = new OnMoveEvent(type);

        for (OnMoveHandler handler: handlers) {
            handler.onMove(event);
        }
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :