WLoginControl.java

/*
 * Created on Mar 2, 2015
 */
package com.delcyon.capo.webapp.widgets;

import eu.webtoolkit.jwt.Signal;
import eu.webtoolkit.jwt.Signal2;
import eu.webtoolkit.jwt.WCompositeWidget;
import eu.webtoolkit.jwt.WContainerWidget;
import eu.webtoolkit.jwt.WLabel;
import eu.webtoolkit.jwt.WLength;
import eu.webtoolkit.jwt.WLength.Unit;
import eu.webtoolkit.jwt.WLineEdit;
import eu.webtoolkit.jwt.WLineEdit.EchoMode;
import eu.webtoolkit.jwt.WPushButton;
import eu.webtoolkit.jwt.WValidator;
import eu.webtoolkit.jwt.WValidator.Result;

/**
 * @author jeremiah
 * @version $Id: $
 */
public class WLoginControl extends WCompositeWidget
{

	
	
	public enum LoginState
	{
		LOGGED_IN,
		LOGGED_OUT,
		INVALID
	}
	 
	
    private WLineEdit userNameFieldTextEdit;
    private WLineEdit passwordNameFieldTextEdit;
    private WPushButton loginButton;
    private WContainerWidget implementationWidget = new WContainerWidget();
    private Signal2<String, String> loginSignal = new Signal2<>();
    private Signal logoutSignal = new Signal();
    private LoginState loginSate = null;
    private boolean wasLoggedIn = false; 
    
    /**
     * 
     */
    public WLoginControl()
    {
        
        setImplementation(implementationWidget);
        
        addStyleClass("form-inline");
        
        WLabel userNameLabel = new WLabel("Username");
        userNameLabel.addStyleClass("sr-only");
        userNameFieldTextEdit = new WLineEdit();
        userNameFieldTextEdit.setAutoComplete(true);
        userNameFieldTextEdit.setValidator(WValidatorFactory.validator(this::validate));
        userNameFieldTextEdit.setWidth(new WLength(100,Unit.Pixel));
        userNameFieldTextEdit.setPlaceholderText(userNameLabel.getText());
        userNameLabel.setBuddy(userNameFieldTextEdit);
        
        
        implementationWidget.addWidget(userNameLabel);
        implementationWidget.addWidget(userNameFieldTextEdit);
        
        WLabel passwordLabel = new WLabel("Password");
        passwordLabel.addStyleClass("sr-only");
        passwordNameFieldTextEdit = new WLineEdit();
        passwordNameFieldTextEdit.setEchoMode(EchoMode.Password);
        passwordNameFieldTextEdit.setAutoComplete(true);  
        passwordNameFieldTextEdit.setValidator(WValidatorFactory.validator(this::validate));
        passwordNameFieldTextEdit.setWidth(new WLength(100,Unit.Pixel));
        passwordNameFieldTextEdit.setPlaceholderText(passwordLabel.getText());
        passwordLabel.setBuddy(passwordNameFieldTextEdit);
        implementationWidget.addWidget(passwordLabel);
        implementationWidget.addWidget(passwordNameFieldTextEdit);
        
        loginButton = new WPushButton("Login");
        implementationWidget.addWidget(loginButton);
        loginButton.clicked().addListener(this,this::fireLoginEvent);
        passwordNameFieldTextEdit.enterPressed().addListener(this, this::fireLoginEvent);
        setLoginSate(LoginState.LOGGED_OUT);
        
    }
    
    /**
     * don't care about input, only about LoginState
     * @param input
     * @return
     */
    public Result validate(String input)
    {
    	if(getLoginSate() == LoginState.LOGGED_OUT)
        {
            return new WValidator.Result(WValidator.State.InvalidEmpty,"Empty");
        }
        else if(getLoginSate() == LoginState.LOGGED_IN)
        {
            return new WValidator.Result(WValidator.State.Valid);
        }
        else
        {
            return new WValidator.Result(WValidator.State.Invalid,"Invalid Username or Password");
        } 
    }
    
    private void fireLoginEvent()
    {
        if(isLoggedIn())
        {
            logoutSignal.trigger();            
        }
        else
        {            
            loginSignal.trigger(userNameFieldTextEdit.getText(), passwordNameFieldTextEdit.getText());
        }
        userNameFieldTextEdit.validate();
        passwordNameFieldTextEdit.validate();
    }
    
    
    
    /**
     * This will result in to strings being passed to the listener, the first is username, the second is the password
     * @return
     */
    public Signal2<String, String> login()
    {
        return loginSignal;
    }

    public Signal logout()
    {
        return logoutSignal;
    }
    
    
    
    /**
     * @return the isLoggedIn    
     */
    public boolean isLoggedIn()
    {
        return (LoginState.LOGGED_IN == getLoginSate());
    }
    
    public LoginState getLoginSate()
	{
		return loginSate;
	}
    
    /**
     * @param This will update the control according to it's correct state of logged in or not.
     */
    public void setLoginSate(LoginState loginSate)
	{
    	if(loginSate != this.loginSate)
    	{
    		switch (loginSate)
			{
			case LOGGED_IN:
				loginButton.setText("Logout");
                passwordNameFieldTextEdit.hide();
                userNameFieldTextEdit.disable();
                userNameFieldTextEdit.setStyleClass("valid");                
                passwordNameFieldTextEdit.setStyleClass("valid");
                wasLoggedIn = true;
				break;
			case LOGGED_OUT:
				loginButton.setText("Login");
				passwordNameFieldTextEdit.show();
				userNameFieldTextEdit.enable();
				if(wasLoggedIn == true)
				{
				    userNameFieldTextEdit.setStyleClass("required");
                    passwordNameFieldTextEdit.setStyleClass("required");
				}
				else
				{
				    userNameFieldTextEdit.setStyleClass("required Wt-edit-emptyText");
				    passwordNameFieldTextEdit.setStyleClass("required Wt-edit-emptyText");
				}
				break;
			case INVALID:
				userNameFieldTextEdit.setStyleClass("invalid");
				passwordNameFieldTextEdit.setStyleClass("invalid");
				break;
			}
    	}
    	if(loginSate != null)
    	{
    		this.loginSate = loginSate;
    	}
    	//make sure any state change doesn't kill the echo nature of the box, not sure if it's me or if there is a bug somewhere.
    	passwordNameFieldTextEdit.setEchoMode(EchoMode.Normal);
    	passwordNameFieldTextEdit.setEchoMode(EchoMode.Password);
	}
}