moodle/lib/form/filepicker.php

<?php
// $Id$

require_once("HTML/QuickForm/button.php");
require_once(dirname(dirname(dirname(__FILE__))) . '/repository/lib.php');

/**
 * HTML class for a single filepicker element (based on button)
 *
 * @author       Moodle.com
 * @version      1.0
 * @since        Moodle 2.0
 * @access       public
 */
class MoodleQuickForm_filepicker extends HTML_QuickForm_input {
    protected $_helpbutton = '';
    protected $_options    = array('maxbytes'=>0, 'filetypes'=>'*', 'returnvalue'=>'*');

    function MoodleQuickForm_filepicker($elementName=null, $elementLabel=null, $attributes=null, $options=null) {
        global $CFG;

        $options = (array)$options;
        foreach ($options as $name=>$value) {
            if (array_key_exists($name, $this->_options)) {
                $this->_options[$name] = $value;
            }
        }
        if (!empty($options['maxbytes'])) {
            $this->_options['maxbytes'] = get_max_upload_file_size($CFG->maxbytes, $options['maxbytes']);
        }
        parent::HTML_QuickForm_input($elementName, $elementLabel, $attributes);
    }

    function setHelpButton($helpbuttonargs, $function='helpbutton') {
        if (!is_array($helpbuttonargs)) {
            $helpbuttonargs = array($helpbuttonargs);
        } else {
            $helpbuttonargs = $helpbuttonargs;
        }
        //we do this to to return html instead of printing it
        //without having to specify it in every call to make a button.
        if ('helpbutton' == $function){
            $defaultargs = array('', '', 'moodle', true, false, '', true);
            $helpbuttonargs = $helpbuttonargs + $defaultargs ;
        }
        $this->_helpbutton=call_user_func_array($function, $helpbuttonargs);
    }

    function getHelpButton() {
        return $this->_helpbutton;
    }

    function getElementTemplateType() {
        if ($this->_flagFrozen){
            return 'nodisplay';
        } else {
            return 'default';
        }
    }

    function toHtml() {
        global $CFG, $COURSE, $USER;

        if ($this->_flagFrozen) {
            return $this->getFrozenHtml();
        }

        $currentfile = '';
        $draftvalue  = '';
        if ($draftid = (int)$this->getValue()) {
            $fs = get_file_storage();
            $usercontext = get_context_instance(CONTEXT_USER, $USER->id);
            if ($files = $fs->get_area_files($usercontext->id, 'user_draft', $draftid, 'id DESC', false)) {
                $file = reset($files);
                $currentfile = $file->get_filename();
                $draftvalue = 'value="'.$draftid.'"';
            }
        }
        $strsaved = get_string('filesaved', 'repository');
        if ($COURSE->id == SITEID) {
            $context = get_context_instance(CONTEXT_SYSTEM);
        } else {
            $context = get_context_instance(CONTEXT_COURSE, $COURSE->id);
        }
        $client_id = uniqid();
        $repository_info = repository_get_client($context, $client_id, $this->_options['filetypes'], $this->_options['returnvalue']);

        $id     = $this->_attributes['id'];
        $elname = $this->_attributes['name'];

        $str = $this->_getTabs();
        $str .= '<input type="hidden" name="'.$elname.'" id="'.$id.'" '.$draftvalue.' />';

        $str .= <<<EOD
<script type="text/javascript">
function updatefile(client_id, obj) {
    document.getElementById('repo_info_'+client_id).innerHTML = obj['file'];
}
function callpicker(client_id, id) {
    var picker = document.createElement('DIV');
    picker.id = 'file-picker-'+client_id;
    picker.className = 'file-picker';
    document.body.appendChild(picker);
    var el=document.getElementById(id);
    var params = {};
    params.env = 'filepicker';
    params.maxbytes = $this->_options['maxbytes'];
    params.maxfiles = $this->_options['maxfiles'];
    params.target = el;
    params.callback = updatefile;
    open_filepicker(client_id, params);
}
</script>
EOD;
        $str .= '<input value="'.get_string('openpicker', 'repository').'" type="button" onclick="callpicker(\''.$client_id.'\', \''.$id.'\')" />'.'<span id="repo_info_'.$client_id.'" class="notifysuccess">'.$currentfile.'</span>'.$repository_info['css'].$repository_info['js'];
        return $str;
    }

    function exportValue(&$submitValues, $assoc = false) {
        global $USER;

        // make sure max one file is present and it is not too big
        if ($draftid = $submitValues[$this->_attributes['name']]) {
            $fs = get_file_storage();
            $usercontext = get_context_instance(CONTEXT_USER, $USER->id);
            if ($files = $fs->get_area_files($usercontext->id, 'user_draft', $draftid, 'id DESC', false)) {
                $file = array_shift($files);
                if ($this->_options['maxbytes'] and $file->get_filesize() > $this->_options['maxbytes']) {
                    // bad luck, somebody tries to sneak in oversized file
                    $file->delete();
                }
                foreach ($files as $file) {
                    // only one file expected
                    $file->delete();
                }
            }
        }

        return array($this->_attributes['name'] => $submitValues[$this->_attributes['name']]);
    }
}