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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4: */

// +----------------------------------------------------------------------+

// | PHP version 4.0                                                      |

// +----------------------------------------------------------------------+

// | Copyright (c) 1997, 1998, 1999, 2000, 2001 The PHP Group             |

// +----------------------------------------------------------------------+

// | This source file is subject to version 2.0 of the PHP license,       |

// | that is bundled with this package in the file LICENSE, and is        |

// | available at through the world-wide-web at                           |

// | http://www.php.net/license/2_02.txt.                                 |

// | If you did not receive a copy of the PHP license and are unable to   |

// | obtain it through the world-wide-web, please send a note to          |

// | license@php.net so we can mail you a copy immediately.               |

// +----------------------------------------------------------------------+

// | Authors: Adam Daniel <adaniel1@eesus.jnj.com>                        |

// |          Bertrand Mansion <bmansion@mamasam.com>                     |

// +----------------------------------------------------------------------+

//

// $Id: advcheckbox.php,v 1.1 2005-03-30 08:50:33 jpm Exp $

require_once('HTML/QuickForm/checkbox.php');

/**

 * HTML class for an advanced checkbox type field

 *

 * Basically this fixes a problem that HTML has had

 * where checkboxes can only pass a single value (the

 * value of the checkbox when checked).  A value for when

 * the checkbox is not checked cannot be passed, and

 * furthermore the checkbox variable doesn't even exist if

 * the checkbox was submitted unchecked.

 *

 * It works by creating a hidden field with the passed-in name

 * and creating the checkbox with no name, but with a javascript

 * onclick which sets the value of the hidden field.

 *

 * @author       Jason Rust <jrust@php.net>

 * @since        2.0

 * @access       public

 */

class HTML_QuickForm_advcheckbox extends HTML_QuickForm_checkbox

{

    // {{{ properties

    /**

     * The values passed by the hidden elment

     *

     * @var array

     * @access private

     */

    var $_values = null;

    /**

     * The default value

     *

     * @var boolean

     * @access private

     */

    var $_currentValue = null;

    // }}}

    // {{{ constructor

    /**

     * Class constructor

     *

     * @param     string    $elementName    (optional)Input field name attribute

     * @param     string    $elementLabel   (optional)Input field label

     * @param     string    $text           (optional)Text to put after the checkbox

     * @param     mixed     $attributes     (optional)Either a typical HTML attribute string

     *                                      or an associative array

     * @param     mixed     $values         (optional)Values to pass if checked or not checked

     *

     * @since     1.0

     * @access    public

     * @return    void

     */

    function HTML_QuickForm_advcheckbox($elementName=null, $elementLabel=null, $text=null, $attributes=null, $values=null)

    {

        $this->HTML_QuickForm_checkbox($elementName, $elementLabel, $text, $attributes);

        $this->setValues($values);

    } //end constructor

    // }}}

    // {{{ getPrivateName()

    /**

     * Gets the pribate name for the element

     *

     * @param   string  $elementName The element name to make private

     *

     * @access public

     * @return string

     */

    function getPrivateName($elementName)

    {

        return '__'.$elementName;

    }

    // }}}

    // {{{ getOnclickJs()

    /**

     * Create the javascript for the onclick event which will

     * set the value of the hidden field

     *

     * @param     string    $elementName    The element name

     *

     * @access public

     * @return string

     */

    function getOnclickJs($elementName)

    {

        $onclickJs = 'if (this.checked) { this.form[\''.$elementName.'\'].value=\''.addcslashes($this->_values[1], '\'').'\'; }';

        $onclickJs .= 'else { this.form[\''.$elementName.'\'].value=\''.addcslashes($this->_values[0], '\'').'\'; }';

        return $onclickJs;

    }

    // }}}

    // {{{ setValues()

    /**

     * Sets the values used by the hidden element

     *

     * @param   mixed   $values The values, either a string or an array

     *

     * @access public

     * @return void

     */

    function setValues($values)

    {

        if (empty($values)) {

            // give it default checkbox behavior

            $this->_values = array('', 1);

        } elseif (is_scalar($values)) {

            // if it's string, then assume the value to

            // be passed is for when the element is checked

            $this->_values = array('', $values);

        } else {

            $this->_values = $values;

        }

        $this->setChecked($this->_currentValue == $this->_values[1]);

    }

    // }}}

    // {{{ setValue()

   /**

    * Sets the element's value

    *

    * @param    mixed   Element's value

    * @access   public

    */

    function setValue($value)

    {

        $this->setChecked(isset($this->_values[1]) && $value == $this->_values[1]);

        $this->_currentValue = $value;

    }

    // }}}

    // {{{ getValue()

   /**

    * Returns the element's value

    *

    * @access   public

    * @return   mixed

    */

    function getValue()

    {

        if (is_array($this->_values)) {

            return $this->_values[$this->getChecked()? 1: 0];

        } else {

            return null;

        }

    }

    // }}}

    // {{{ toHtml()

    /**

     * Returns the checkbox element in HTML

     * and the additional hidden element in HTML

     *

     * @access    public

     * @return    string

     */

    function toHtml()

    {

        if ($this->_flagFrozen) {

            return parent::toHtml();

        } else {

            $oldName = $this->getName();

            $oldJs   = $this->getAttribute('onclick');

            $this->updateAttributes(array(

                'name'    => $this->getPrivateName($oldName),

                'onclick' => $this->getOnclickJs($oldName) . ' ' . $oldJs

            ));

            $html = parent::toHtml() . '<input type="hidden" name="' . $oldName .

                    '" value="' . $this->getValue() . '" />';

            // revert the name and JS, in case this method will be called once more

            $this->updateAttributes(array(

                'name'    => $oldName,

                'onclick' => $oldJs

            ));

            return $html;

        }

    } //end func toHtml

    // }}}

    // {{{ getFrozenHtml()

   /**

    * Unlike checkbox, this has to append a hidden input in both

    * checked and non-checked states

    */

    function getFrozenHtml()

    {

        return ($this->getChecked()? '<tt>[x]</tt>': '<tt>[ ]</tt>') .

               $this->_getPersistantData();

    }

    // }}}

    // {{{ onQuickFormEvent()

    /**

     * Called by HTML_QuickForm whenever form event is made on this element

     *

     * @param     string    $event  Name of event

     * @param     mixed     $arg    event arguments

     * @param     object    $caller calling object

     * @since     1.0

     * @access    public

     * @return    void

     */

    function onQuickFormEvent($event, $arg, &$caller)

    {

        switch ($event) {

            case 'updateValue':

                // constant values override both default and submitted ones

                // default values are overriden by submitted

                $value = $this->_findValue($caller->_constantValues);

                if (null === $value) {

                    $value = $this->_findValue($caller->_submitValues);

                    if (null === $value) {

                        $value = $this->_findValue($caller->_defaultValues);

                    }

                }

                if (null !== $value) {

                    $this->setValue($value);

                }

                break;

            default:

                parent::onQuickFormEvent($event, $arg, $caller);

        }

        return true;

    } // end func onQuickFormLoad

    // }}}

    // {{{ exportValue()

   /**

    * This element has a value even if it is not checked, thus we override

    * checkbox's behaviour here

    */

    function exportValue(&$submitValues, $assoc)

    {

        $value = $this->_findValue($submitValues);

        if (null === $value) {

            $value = $this->getValue();

        } elseif (is_array($this->_values) && ($value != $this->_values[0]) && ($value != $this->_values[1])) {

            $value = null;

        }

        return $this->_prepareValue($value, $assoc);

    }

    // }}}

} //end class HTML_QuickForm_advcheckbox

?>