C:/xampp/htdocs/moodle/lib/form/htmleditor.php

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<?php
global $CFG;
require_once("$CFG->libdir/form/textarea.php");

class MoodleQuickForm_htmleditor extends MoodleQuickForm_textarea{
    var $_type;
    var $_canUseHtmlEditor;
    var $_options=array('canUseHtmlEditor'=>'detect','rows'=>10, 'cols'=>45, 'width'=>0,'height'=>0);
    function MoodleQuickForm_htmleditor($elementName=null, $elementLabel=null, $options=array(), $attributes=null){
        parent::MoodleQuickForm_textarea($elementName, $elementLabel, $attributes);
        // set the options, do not bother setting bogus ones
        if (is_array($options)) {
            foreach ($options as $name => $value) {
                if (array_key_exists($name, $this->_options)) {
                    if (is_array($value) && is_array($this->_options[$name])) {
                        $this->_options[$name] = @array_merge($this->_options[$name], $value);
                    } else {
                        $this->_options[$name] = $value;
                    }
                }
            }
        }
        if ($this->_options['canUseHtmlEditor']=='detect'){
            $this->_options['canUseHtmlEditor']=can_use_html_editor();
        }
        if ($this->_options['canUseHtmlEditor']){
            $this->_type='htmleditor';
            //$this->_elementTemplateType='wide';
        }else{
            $this->_type='textarea';
        }
        $this->_canUseHtmlEditor = $this->_options['canUseHtmlEditor'];

        editors_head_setup();
    }
    function setHelpButton($helpbuttonargs, $function='helpbutton'){
        debugging('component setHelpButton() is not used any more, please use $mform->setHelpButton() instead');
    }

    function toHtml(){
        //if ($this->_canUseHtmlEditor && !$this->_flagFrozen){
        //    $script = '';
        //} else {
        //    $script='';
        //}
        if ($this->_flagFrozen) {
            return $this->getFrozenHtml();
        } else {
            return $this->_getTabs() .
                    print_textarea($this->_canUseHtmlEditor,
                                    $this->_options['rows'],
                                    $this->_options['cols'],
                                    $this->_options['width'],
                                    $this->_options['height'],
                                    $this->getName(),
                                    preg_replace("/(\r\n|\n|\r)/", '&#010;',$this->getValue()),
                                    0, // unused anymore
                                    true,
                                    $this->getAttribute('id'));
        }
    } //end func toHtml

    function getFrozenHtml()
    {
        $html = format_text($this->getValue());
        return $html . $this->_getPersistantData();
    } //end func getFrozenHtml
}