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<?php

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

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

// | PHP Version 4                                                        |

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

// | Copyright (c) 1997-2003 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.               |

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

// | Author:  Matteo Di Giovinazzo <matteodg@infinito.it>                 |

// |                                                                      |

// | For the JavaScript code thanks to Martin Honnen and                  |

// | Nicholas C. Zakas                                                    |

// | See:                                                                 |

// |      http://www.faqts.com/knowledge_base/view.phtml/aid/13562        |

// | and                                                                  |

// |      http://www.sitepoint.com/article/1220                           |

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

//

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

require_once("HTML/QuickForm/text.php");

/**

 * Class to dynamically create an HTML input text element that

 * at every keypressed javascript event, check in an array of options

 * if there's a match and autocomplete the text in case of match.

 *

 * Ex:

 * $autocomplete =& $form->addElement('autocomplete', 'fruit', 'Favourite fruit:');

 * $options = array("Apple", "Orange", "Pear", "Strawberry");

 * $autocomplete->setOptions($options);

 *

 * @author       Matteo Di Giovinazzo <matteodg@infinito.it>

 */

class HTML_QuickForm_autocomplete extends HTML_QuickForm_text

{

    // {{{ properties

    /**

     * Options for the autocomplete input text element

     *

     * @var       array

     * @access    private

     */

    var $_options = array();

    // }}}

    // {{{ constructor

    /**

     * Class constructor

     *

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

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

     * @param     array     $options        (optional)Autocomplete options

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

     *                                      or an associative array. Date format is passed along the attributes.

     * @access    public

     * @return    void

     */

    function HTML_QuickForm_autocomplete($elementName = null, $elementLabel = null, $options = null, $attributes = null)

    {

        $this->HTML_QuickForm_text($elementName, $elementLabel, $attributes);

        $this->_persistantFreeze = true;

        $this->_type = 'autocomplete';

        if (isset($options)) {

            $this->setOptions($options);

        }

    } //end constructor

    // }}}

    // {{{ setOptions()

    /**

     * Sets the options for the autocomplete input text element

     *

     * @param     array    $options    Array of options for the autocomplete input text element

     * @access    public

     * @return    void

     */

    function setOptions($options)

    {

        $this->_options = array_values($options);

    } // end func setOptions

    // }}}

    // {{{ toHtml()

    /**

     * Returns Html for the autocomplete input text element

     *

     * @access      public

     * @return      string

     */

    function toHtml()

    {

        // prevent problems with grouped elements

        $arrayName = str_replace(array('[', ']'), array('__', ''), $this->getName()) . '_values';

        $this->updateAttributes(array(

            'onkeypress' => 'return autocomplete(this, event, ' . $arrayName . ');'

        ));

        if ($this->_flagFrozen) {

            $js = '';

        } else {

            $js = "<script type=\"text/javascript\">\n//<![CDATA[\n";

            if (!defined('HTML_QUICKFORM_AUTOCOMPLETE_EXISTS')) {

                $js .= <<<EOS

/* begin javascript for autocomplete */

function setSelectionRange(input, selectionStart, selectionEnd) {

    if (input.setSelectionRange) {

        input.setSelectionRange(selectionStart, selectionEnd);

    }

    else if (input.createTextRange) {

        var range = input.createTextRange();

        range.collapse(true);

        range.moveEnd("character", selectionEnd);

        range.moveStart("character", selectionStart);

        range.select();

    }

    input.focus();

}

function setCaretToPosition(input, position) {

    setSelectionRange(input, position, position);

}

function replaceSelection (input, replaceString) {

	var len = replaceString.length;

    if (input.setSelectionRange) {

        var selectionStart = input.selectionStart;

        var selectionEnd = input.selectionEnd;

        input.value = input.value.substring(0, selectionStart) + replaceString + input.value.substring(selectionEnd);

		input.selectionStart  = selectionStart + len;

		input.selectionEnd  = selectionStart + len;

    }

    else if (document.selection) {

        var range = document.selection.createRange();

		var saved_range = range.duplicate();

        if (range.parentElement() == input) {

            range.text = replaceString;

			range.moveEnd("character", saved_range.selectionStart + len);

			range.moveStart("character", saved_range.selectionStart + len);

			range.select();

        }

    }

    input.focus();

}

function autocompleteMatch (text, values) {

    for (var i = 0; i < values.length; i++) {

        if (values[i].toUpperCase().indexOf(text.toUpperCase()) == 0) {

            return values[i];

        }

    }

    return null;

}

function autocomplete(textbox, event, values) {

    if (textbox.setSelectionRange || textbox.createTextRange) {

        switch (event.keyCode) {

            case 38:    // up arrow

            case 40:    // down arrow

            case 37:    // left arrow

            case 39:    // right arrow

            case 33:    // page up

            case 34:    // page down

            case 36:    // home

            case 35:    // end

            case 13:    // enter

            case 9:     // tab

            case 27:    // esc

            case 16:    // shift

            case 17:    // ctrl

            case 18:    // alt

            case 20:    // caps lock

            case 8:     // backspace

            case 46:    // delete

                return true;

                break;

            default:

                var c = String.fromCharCode(

                    (event.charCode == undefined) ? event.keyCode : event.charCode

                );

                replaceSelection(textbox, c);

                sMatch = autocompleteMatch(textbox.value, values);

                var len = textbox.value.length;

                if (sMatch != null) {

                    textbox.value = sMatch;

                    setSelectionRange(textbox, len, textbox.value.length);

                }

                return false;

        }

    }

    else {

        return true;

    }

}

/* end javascript for autocomplete */

EOS;

                define('HTML_QUICKFORM_AUTOCOMPLETE_EXISTS', true);

            }

            $jsEscape = array(

                "\r"    => '\r',

                "\n"    => '\n',

                "\t"    => '\t',

                "'"     => "\\'",

                '"'     => '\"',

                '\\'    => '\\\\'

            );

            $js .= 'var ' . $arrayName . " = new Array();\n";

            for ($i = 0; $i < count($this->_options); $i++) {

                $js .= $arrayName . '[' . $i . "] = '" . strtr($this->_options[$i], $jsEscape) . "';\n";

            }

            $js .= "//]]>\n</script>";

        }

        return $js . parent::toHtml();

    }// end func toHtml

    // }}}

} // end class HTML_QuickForm_autocomplete

?>