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

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Here is the source code for com.edgenius.wiki.gwt.client.widgets.CaptchaWidget.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.Date;

import com.edgenius.wiki.gwt.client.Css;
import com.edgenius.wiki.gwt.client.GwtClientUtils;
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.DOM;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;

/**
 * @author Dapeng.Ni
 */
public class CaptchaWidget extends SimplePanel {

    private VerticalPanel panel = new VerticalPanel();
    private TextBox captchaInput = new TextBox();

    //if page has more than one captcha image, this uid will helpful during refresh update.
    private String uid = HTMLPanel.createUniqueId();

    public CaptchaWidget() {
        panel.setSize("100%", "100%");
        captchaInput.setStyleName(Css.FORM_INPUT);
        this.setWidget(panel);
    }

    /**
     * 
     */
    public void refresh() {
        Date now = new Date();
        //must give a parameter name "refresh=", otherwise, ognl throw NumberFormatExcetpion!
        DOM.setElementAttribute(DOM.getElementById("captchaImg" + uid), "src",
                GwtClientUtils.getBaseUrl() + "captcha.do?refresh=" + now.getTime());
        captchaInput.setText("");
        captchaInput.setFocus(true);
    }

    /**
     * @return
     */
    public boolean isEnabled() {

        return (panel.getWidgetCount() > 0) ? true : false;
    }

    /**
     * 
     */
    public void enable() {
        //DONOT user visible or invisible to switch enable/disable
        panel.clear();
        Date now = new Date();
        //must give a parameter name "refresh=", otherwise, ognl throw NumberFormatExcetpion!
        final HTML captcha = new HTML("<image id='captchaImg" + uid + "' src='" + GwtClientUtils.getBaseUrl()
                + "captcha.do?refresh=" + now.getTime() + "'>");
        ClickLink refreshCaptcha = new ClickLink(Msg.consts.refresh_image());
        refreshCaptcha.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                refresh();
            }
        });

        captchaInput.setName("j_captcha_response");
        //      Label desc = new Label("input are lower case");
        panel.add(captcha);
        panel.add(refreshCaptcha);
        panel.add(captchaInput);
        //      panel.add(desc);
        panel.setCellHorizontalAlignment(captcha, HasHorizontalAlignment.ALIGN_CENTER);
        panel.setCellHorizontalAlignment(refreshCaptcha, HasHorizontalAlignment.ALIGN_CENTER);
        panel.setCellHorizontalAlignment(captchaInput, HasHorizontalAlignment.ALIGN_CENTER);
        //      panel.setCellHorizontalAlignment(desc, HasHorizontalAlignment.ALIGN_CENTER);
    }

    /**
     * 
     */
    public void disable() {
        panel.clear();

    }

    /**
     * @return
     */
    public String getCaptchaInput() {
        return captchaInput.getText();
    }

    /**
     * @return, for Enter check
     */
    public TextBox getCaptchaInputWidget() {
        return captchaInput;
    }

}