com.agnie.gwt.common.client.widget.LabelPasswordBox.java Source code

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Here is the source code for com.agnie.gwt.common.client.widget.LabelPasswordBox.java

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/*******************************************************************************
 * Copyright (c) 2014 Agnie Technologies.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Agnie Technologies - initial API and implementation
 ******************************************************************************/
package com.agnie.gwt.common.client.widget;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Window.Navigator;
import com.google.gwt.user.client.ui.PopupPanel;

/**
 * LabelPasswordBox is an 'extended GWT LabelTextBox' to show label(e.g.'password')<br>
 * as text field default value(in little bit light color).<br>
 * <br>
 * on focus it switch to password field until end user enter valid password <br>
 * other than if end user enter invalid or null it switches to text field
 */
public class LabelPasswordBox extends LabelTextBox {
    private static LabelTextBoxResources resource = LabelTextBoxResources.INSTANCE;

    boolean passwordmode = false;
    static {
        resource.css().ensureInjected();
    }

    public LabelPasswordBox() {
        this(null);
    }

    public LabelPasswordBox(String label) {

        super.setLabel(label);

        /*
         * NOTE: Below code to detect firefox browser and make use of focus event to change type of input field to
         * password. Is a temporary fix, ideal way to handle the browser specific handling is to make use of deferred
         * binding. The issue is when we make use of key press handler to change the type first key is not getting
         * recognised on firefox because of some reason. And if we think of using focus handler for all browsers. Focus
         * handler fails to convert it to password box on chrome.
         */
        String userAgent = Navigator.getUserAgent();
        if (userAgent.contains("Firefox")) {
            super.addFocusHandler(new FocusHandler() {
                @Override
                public void onFocus(FocusEvent arg0) {
                    changeTypeToPass();
                    removeStyle();
                }
            });
        } else {
            super.addKeyPressHandler(new KeyPressHandler() {

                @Override
                public void onKeyPress(KeyPressEvent event) {
                    if (!passwordmode) {
                        Scheduler.get().scheduleDeferred(new Command() {
                            public void execute() {
                                changeTypeToPass();
                                removeStyle();
                            }
                        });
                        passwordmode = true;
                    }
                }
            });
        }
        super.addBlurHandler(new BlurHandler() {

            @Override
            public void onBlur(BlurEvent arg0) {
                String value = getValue();
                if (value.isEmpty()) {
                    changeTypeToText();
                    addStyle();
                    passwordmode = false;
                } else {
                    changeTypeToPass();
                    removeStyle();
                }
            }
        });

    }

    /**
     * To reset field with default label.
     */
    public void reset() {
        super.reset();
        changeTypeToText();
    }

    /**
     * to get ErrorMessage Panel
     * 
     * @return
     */
    public PopupPanel getErrorPan() {
        return this.errorPan;
    }

    /**
     * changes type of text field to password field
     */
    private void changeTypeToPass() {
        super.textBox.getElement().setAttribute("type", "password");
    }

    /**
     * To resume to text field / changes type of password field to text field
     */
    private void changeTypeToText() {
        super.textBox.getElement().setAttribute("type", "text");
    }
}