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

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Here is the source code for com.edgenius.wiki.gwt.client.widgets.CandidateListPanel.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.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.edgenius.wiki.gwt.client.Css;
import com.edgenius.wiki.gwt.client.i18n.Msg;
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.HTML;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * @author Dapeng.Ni
 */
public class CandidateListPanel extends SimplePanel {
    FlowPanel panel = new FlowPanel();
    List values = new ArrayList();

    public CandidateListPanel() {
        panel.setWidth("99%");
        this.setWidth("100%");
        this.setWidget(panel);
        this.setStyleName(Css.CANDIDATE_LIST);
    }

    public void addCandidate(String text, final Object model) {
        for (Iterator iter = values.iterator(); iter.hasNext();) {
            //don't allow add same value over once. 
            Object obj = iter.next();
            if (obj.equals(model))
                return;
        }

        //cache value
        values.add(model);

        //UI part
        final ClickLink candidate = new ClickLink(text);
        candidate.setTitle(Msg.consts.click_remove());
        if (panel.getWidgetCount() > 0) {
            //if there are more candidate, then add ","
            HTML sep = new HTML(", ");
            panel.add(sep);
        }
        panel.add(candidate);
        candidate.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                values.remove(model);
                Widget sep = null;
                //remove this candidate and its following "," if it has
                for (Iterator iter = panel.iterator(); iter.hasNext();) {
                    if (iter.next() == candidate) {
                        iter.remove();
                        if (iter.hasNext()) {
                            sep = (Widget) iter.next();
                        }
                        break;
                    }

                }
                if (sep instanceof HTML) {
                    panel.remove(sep);
                } else {
                    //maybe remove last second candidate, which has not "," but before it, there are should be ","
                    int count = panel.getWidgetCount();
                    if (count > 0 && (panel.getWidget(count - 1) instanceof HTML)) {
                        panel.remove(count - 1);
                    }
                }
                if (panel.getWidgetCount() == 0) {
                    CandidateListPanel.this.setStyleName(Css.CANDIDATE_LIST);
                } else {
                    CandidateListPanel.this.setStyleName(Css.CANDIDATE_LIST_ENALBE);
                }
            }
        });

        if (panel.getWidgetCount() == 0) {
            this.setStyleName(Css.CANDIDATE_LIST);
        } else {
            this.setStyleName(Css.CANDIDATE_LIST_ENALBE);
        }
    }

    public void clear() {
        panel.clear();
        values.clear();
        this.setStyleName(Css.CANDIDATE_LIST);
    }

    public List getCandidates() {
        return values;
    }
}