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<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
 * Widget Plugin 
 * 
 * Install this file as application/plugins/widget_pi.php
 * 
 * @version:     0.1
 * $copyright     Copyright (c) Wiredesignz 2009-03-24
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
class Widget
{
    function Widget() {
        $this->_assign_libraries();
    }
    
    function run($name) {        
        $args = func_get_args();
        
        require_once APPPATH.'widgets/'.$name.EXT;
        $name = ucfirst($name);
        
        $widget =& new $name();
        return call_user_func_array(array(&$widget, 'run'), array_slice($args, 1));    
    }
    
    function render($view, $data = array()) {
        extract($data);
        include APPPATH.'widgets/views/'.$view.EXT;
    }

    function load($object) {
        $this->$object =& load_class(ucfirst($object));
    }

    function _assign_libraries() {
        $ci =& get_instance();
        foreach (get_object_vars($ci) as $key => $object) {
            $this->$key =& $ci->$key;
        }
    }
}

<?php widget::run('user_login', (bool) $this->user->is_guest); ?>

class User_login extends Widget
{
    function run($visible = FALSE) {
        
        if ($post = $this->input->post('loginform')) {
            if ($post['username'] == 'admin') {
                $query = $this->db->query("SELECT uid FROM user WHERE username='admin'");
                $result = $query->row();
                
                set_cookie('ci_user', $result->uid, 86500);
                redirect();
            }
        }
        
        if ($visible) $this->render('user_login');
    }
}

<div class="widget">
<div class="header">Login</div>
<div class="content">
<form action="" method="post">
<div class="row">
<label for="loginform_username">Username</label><br>
<input name="loginform[username]" id="loginform_username" type="text" value="" /></div>
<div class="row">
<label for="loginform_password">Password</label><br>
<input name="loginform[password]" id="loginform_password" type="password" value="" /></div>
<div class="row">
<input type="hidden" value="0" name="loginform[rememberme]" /><input name="loginform[rememberme]" id="loginform_rememberme" value="1" type="checkbox" ><label for="loginform_rememberme">Remember me next time</label></div>
<div class="row">
<input type="submit" value="Login" /></div>
</form>
</div></div>

class Login extends Widget
{
    
    function run()
    {
        $this->load('form_validation');
        $this->load->database();
        
        #$this->load('session');
        
        #$this->session->set_userdata('test');

        
        $this->form_validation->set_rules('username','Användarnamn','required|callback__check_user_pw');
        $this->form_validation->set_rules('password','Lösenord','required');
        
        $this->form_validation->set_message('required','Du måste fylla i %s');
        
        if ($this->form_validation->run() == FALSE)
        {
            echo validation_errors();
            echo "incorrect";
        }
        else
        {
            echo "correkt";
        }
        }
}

echo $this->form_validation->error_string();