ilarkesto.gwt.client.NavigatorWidget.java Source code

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Here is the source code for ilarkesto.gwt.client.NavigatorWidget.java

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/*
 * Copyright 2011 Witoslaw Koczewsi <wi@koczewski.de>, Artjom Kochtchi
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero
 * General Public License as published by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 Affero General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 */
package ilarkesto.gwt.client;

import ilarkesto.core.logging.Log;
import ilarkesto.core.menu.MenuItem;
import ilarkesto.core.menu.StaticMenu;
import ilarkesto.core.menu.StaticMenuItem;
import ilarkesto.core.menu.Submenu;
import ilarkesto.core.time.Tm;
import ilarkesto.gwt.client.animation.AnimatingFlowPanel;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;

public class NavigatorWidget<K extends Object> extends AWidget {

    private static final Log log = Log.get(NavigatorWidget.class);

    private FlowPanel panel;
    protected StaticMenu menu;
    private MenuItem lastAnimatedItem;
    private long lastUpdateTime;

    @Override
    protected Widget onInitialization() {
        if (menu == null)
            menu = new StaticMenu();

        panel = new FlowPanel();
        panel.setStyleName("NavigatorWidget");

        return panel;
    }

    @Override
    protected void onUpdate() {
        if (!menu.getChangeIndicator().hasChangedSince(lastUpdateTime))
            return;

        panel.clear();
        panel.add(Gwt.createEmptyDiv("NavigatorWidget-head"));
        for (StaticMenuItem item : menu.getItems()) {
            panel.add(createItemWidget(item));
        }
        super.onUpdate();
        lastUpdateTime = Tm.getCurrentTimeMillis();
    }

    protected String getHref(MenuItem item) {
        return null;
    }

    private Widget createItemWidget(final MenuItem item) {
        final ImageAnchor a = new ImageAnchor(null, item.getLabel());
        String href = getHref(item);
        if (href != null) {
            a.setHref(href);
        } else {
            a.addClickHandler(new ClickHandler() {

                @Override
                public void onClick(ClickEvent event) {
                    log.debug("Item clicked:", item.getLabel());
                    event.stopPropagation();
                    item.select();
                    a.setFocus(false);
                    update();
                }
            });
        }

        FlowPanel itemPanel = new FlowPanel();
        itemPanel.setStyleName("NavigatorWidget-item");
        SimplePanel itemLink = Gwt.createDiv("NavigatorWidget-item-link", a);
        itemPanel.add(itemLink);
        if (item.isSelected()) {
            if (item instanceof Submenu) {
                boolean animate = lastAnimatedItem != item;
                // log.debug("---------- animate:", animate);
                Widget submenuPanel = animate ? new AnimatingFlowPanel() : new FlowPanel();
                if (animate)
                    lastAnimatedItem = item;
                submenuPanel.setStyleName("NavigatorWidget-submenu");
                itemPanel.add(submenuPanel);
                Submenu<MenuItem> submenu = (Submenu) item;
                for (MenuItem subItem : submenu.getMenu().getItems()) {
                    ((HasWidgets) submenuPanel).add(createItemWidget(subItem));
                }
            } else {
                itemLink.addStyleDependentName("selected");
            }
        }

        return itemPanel;
    }

    public void addItem(String label, K key, Runnable selecionListener) {
        initialize();

        boolean menuEmpty = menu.getItems().isEmpty();

        StaticMenuItem item = menu.addItem(new StaticMenuItem(label));
        if (menuEmpty)
            item.select();
        item.setPayload(key);
        item.setOnSelect(selecionListener);
    }

    public void select(K key) {
        StaticMenuItem item = menu.getItemByPayload(key);
        if (item == null)
            return;
        item.select();
        update();
    }

    public void setMenu(StaticMenu menu) {
        this.menu = menu;
    }

    @Override
    public String toString() {
        return "NavigatorWidget(" + menu + ")";
    }
}