com.edgenius.wiki.gwt.client.widgets.URLTabBar.java Source code

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Here is the source code for com.edgenius.wiki.gwt.client.widgets.URLTabBar.java

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/* 
 * =============================================================
 * Copyright (C) 2007-2011 Edgenius (http://www.edgenius.com)
 * =============================================================
 * License Information: http://www.edgenius.com/licensing/edgenius/2.0/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2.0
 * as published by the Free Software Foundation.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * http://www.gnu.org/licenses/gpl.txt
 *  
 * ****************************************************************
 */
package com.edgenius.wiki.gwt.client.widgets;

import java.util.Iterator;

import com.edgenius.wiki.gwt.client.Css;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.BeforeSelectionEvent;
import com.google.gwt.event.logical.shared.BeforeSelectionHandler;
import com.google.gwt.event.logical.shared.HasBeforeSelectionHandlers;
import com.google.gwt.event.logical.shared.HasSelectionHandlers;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * @author Dapeng.Ni
 */
public class URLTabBar extends SimplePanel
        implements HasBeforeSelectionHandlers<Integer>, HasSelectionHandlers<Integer> {
    private FlowPanel tabBar = new FlowPanel();
    private int uniqueID = 0;

    public URLTabBar() {
        this.setStyleName(Css.TAB_BAR);
        tabBar.setSize("100%", "100%");
        this.setWidget(tabBar);
    }

    public void clear() {
        tabBar.clear();
    }

    public int addTab(String title, Image icon) {
        FlowPanel tab = new FlowPanel();
        if (icon != null)
            tab.add(icon);

        ClickLink link = new ClickLink(title);
        Label label = new Label(title);
        tab.add(link);
        tab.add(label);
        link.setStyleName(Css.TEXT);
        label.setStyleName(Css.TEXT);
        //init status: only show link
        label.setVisible(false);
        //tab.setStyleName(Css.DESELECTED);
        tabBar.add(tab);

        //increase uniqueID every new tab
        final int tabIndex = uniqueID++;
        link.setObject(tabIndex);

        link.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                BeforeSelectionEvent<Integer> evt = BeforeSelectionEvent.fire(URLTabBar.this, tabIndex);
                if (evt != null && !evt.isCanceled()) {
                    select(tabIndex);
                    SelectionEvent.fire(URLTabBar.this, tabIndex);

                }
            }
        });

        return tabIndex;
    }

    protected void select(int uniqueID) {

        for (Iterator<Widget> iter1 = tabBar.iterator(); iter1.hasNext();) {
            FlowPanel tab = (FlowPanel) iter1.next();

            if (getTabUniqueID(tab) == uniqueID) {
                //select
                tab.addStyleName(Css.SELECTED);
                tab.removeStyleName(Css.DESELECTED);
                //show label, hide link
                for (Iterator<Widget> iter = tab.iterator(); iter.hasNext();) {
                    Widget w = iter.next();
                    if (w instanceof ClickLink) {
                        w.setVisible(false);
                    } else if (w instanceof Label) {
                        w.setVisible(true);
                    }
                }
            } else {
                //de-select
                tab.removeStyleName(Css.SELECTED);
                tab.addStyleName(Css.DESELECTED);
                //show link, hide label
                for (Iterator<Widget> iter = tab.iterator(); iter.hasNext();) {
                    Widget w = iter.next();
                    if (w instanceof ClickLink) {
                        w.setVisible(true);
                    } else if (w instanceof Label) {
                        w.setVisible(false);
                    }
                }
            }
        }
    }

    public void resetTabTitle(int uniqueID, String title, Image titleIcon) {
        for (Iterator<Widget> iter1 = tabBar.iterator(); iter1.hasNext();) {
            FlowPanel tab = (FlowPanel) iter1.next();
            if (getTabUniqueID(tab) == uniqueID) {
                for (Iterator<Widget> iter = tab.iterator(); iter.hasNext();) {
                    Widget w = iter.next();
                    if (w instanceof ClickLink) {
                        ((ClickLink) w).setText(title);
                    } else if (w instanceof Label) {
                        ((Label) w).setText(title);
                    } else if (w instanceof Image) {
                        //remove current image
                        iter.remove();
                    }
                }
                //add new image to first 
                if (titleIcon != null)
                    tab.insert(titleIcon, 0);
                break;
            }
        }
    }

    /**
     * @param tab
     * @return
     */
    private int getTabUniqueID(FlowPanel tab) {
        for (Iterator<Widget> iter = tab.iterator(); iter.hasNext();) {
            Widget w = iter.next();
            if (w instanceof ClickLink) {
                return (Integer) ((ClickLink) w).getObject();
            }
        }
        return -1;
    }

    public HandlerRegistration addBeforeSelectionHandler(BeforeSelectionHandler<Integer> handler) {
        return this.addHandler(handler, BeforeSelectionEvent.getType());
    }

    public HandlerRegistration addSelectionHandler(SelectionHandler<Integer> handler) {
        return this.addHandler(handler, SelectionEvent.getType());
    }
}