class.forms.php

        ?><div style="margin-bottom:0.5em;margin-top:0.5em"><strong><?php
        echo Format::htmlchars($this->field->get('label'));
        ?></strong>:</div>
        <textarea style="width:100%;" name="<?php echo $this->field->get('name'); ?>"
            placeholder="<?php echo Format::htmlchars($this->field->get('hint')); ?>"
            <?php if (!$client) { ?>
                data-draft-namespace="ticket.staff"
            <?php } else { ?>
                data-draft-namespace="ticket.client"
                data-draft-object-id="<?php echo substr(session_id(), -12); ?>"
            <?php } ?>
            class="richtext draft draft-delete ifhtml"
            cols="21" rows="8" style="width:80%;"><?php echo
            Format::htmlchars($this->value); ?></textarea>
    <?php
        $config = $this->field->getConfiguration();
        if (!$config['attachments'])
            return;

        $attachments = $this->getAttachments($config);
        print $attachments->render($client);
        foreach ($attachments->getMedia() as $type=>$urls) {
            foreach ($urls as $url)
                Form::emitMedia($url, $type);
        }
    }

    function getAttachments($config=false) {
        if (!$config)
            $config = $this->field->getConfiguration();

        $field = new FileUploadField(array(
            'id'=>'attach',
            'name'=>'attach:' . $this->field->get('id'),
            'configuration'=>$config)
        );
        $field->setForm($this->field->getForm());
        return $field;
    }
}

class FileUploadWidget extends Widget {
    static $media = array(
        'css' => array(
            '/css/filedrop.css',
        ),
    );

    function render($how) {
        $config = $this->field->getConfiguration();
        $name = $this->field->getFormName();
        $id = substr(md5(spl_object_hash($this)), 10);
        $attachments = $this->field->getFiles();
        $mimetypes = array_filter($config['__mimetypes'],
            function($t) { return strpos($t, '/') !== false; }
        );
        $files = array();
        foreach ($this->value ?: array() as $fid) {
            $found = false;
            foreach ($attachments as $f) {
                if ($f['id'] == $fid) {
                    $files[] = $f;
                    $found = true;
                    break;
                }
            }
            if (!$found && ($file = AttachmentFile::lookup($fid))) {
                $files[] = array(
                    'id' => $file->getId(),
                    'name' => $file->getName(),
                    'type' => $file->getType(),
                    'size' => $file->getSize(),
                );
            }
        }
        ?><div id="<?php echo $id;
            ?>" class="filedrop"><div class="files"></div>
            <div class="dropzone"><i class="icon-upload"></i>
            <?php echo sprintf(
                __('Drop files here or %s choose them %s'),
                '<a href="#" class="manual">', '</a>'); ?>
        <input type="file" multiple="multiple"
            id="file-<?php echo $id; ?>" style="display:none;"
            accept="<?php echo implode(',', $config['__mimetypes']); ?>"/>
        </div></div>
        <script type="text/javascript">
        $(function(){$('#<?php echo $id; ?> .dropzone').filedropbox({
          url: 'ajax.php/form/upload/<?php echo $this->field->get('id') ?>',
          link: $('#<?php echo $id; ?>').find('a.manual'),
          paramname: 'upload[]',
          fallback_id: 'file-<?php echo $id; ?>',
          allowedfileextensions: <?php echo JsonDataEncoder::encode(
            $config['__extensions'] ?: array()); ?>,
          allowedfiletypes: <?php echo JsonDataEncoder::encode(
            $mimetypes); ?>,
          maxfiles: <?php echo $config['max'] ?: 20; ?>,
          maxfilesize: <?php echo ($config['size'] ?: 1048576) / 1048576; ?>,
          name: '<?php echo $name; ?>[]',
          files: <?php echo JsonDataEncoder::encode($files); ?>
        });});
        </script>
<?php
    }

    function getValue() {
        $data = $this->field->getSource();
        $ids = array();
        // Handle manual uploads (IE<10)
        if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_FILES[$this->name])) {
            foreach (AttachmentFile::format($_FILES[$this->name]) as $file) {
                try {
                    $ids[] = $this->field->uploadFile($file);
                }
                catch (FileUploadError $ex) {}
            }
            return array_merge($ids, parent::getValue() ?: array());
        }
        // If no value was sent, assume an empty list
        elseif ($data && is_array($data) && !isset($data[$this->name]))
            return array();

        return parent::getValue();
    }
}

class FileUploadError extends Exception {}

class VisibilityConstraint {

    const HIDDEN =      0x0001;
    const VISIBLE =     0x0002;

    var $initial;
    var $constraint;

    function __construct($constraint, $initial=self::VISIBLE) {
        $this->constraint = $constraint;
        $this->initial = $initial;
    }

    function emitJavascript($field) {
        $func = 'recheck';
        $form = $field->getForm();
?>
    <script type="text/javascript">
      !(function() {
        var <?php echo $func; ?> = function() {
          var target = $('#field<?php echo $field->getWidget()->id; ?>');

<?php   $fields = $this->getAllFields($this->constraint);
        foreach ($fields as $f) {
            $field = $form->getField($f);
            echo sprintf('var %1$s = $("#%1$s");',
                $field->getWidget()->id);
        }
        $expression = $this->compileQ($this->constraint, $form);
?>
          if (<?php echo $expression; ?>)
            target.slideDown('fast', function (){
                $(this).trigger('show');
                });
          else
            target.slideUp('fast', function (){
                $(this).trigger('hide');
                });
        };

<?php   foreach ($fields as $f) {
            $w = $form->getField($f)->getWidget();
?>
        $('#<?php echo $w->id; ?>').on('change', <?php echo $func; ?>);
        $('#field<?php echo $w->id; ?>').on('show hide', <?php
                echo $func; ?>);
<?php   } ?>
      })();
    </script><?php
    }

    /**
     * Determines if the field was visible when the form was submitted
     */
    function isVisible($field) {
        return $this->compileQPhp($this->constraint, $field);
    }

    function compileQPhp(Q $Q, $field) {
        $form = $field->getForm();
        $expr = array();
        foreach ($Q->constraints as $c=>$value) {
            if ($value instanceof Q) {
                $expr[] = $this->compileQPhp($value, $field);
            }
            else {
                @list($f, $op) = explode('__', $c, 2);
                $field = $form->getField($f);
                $wval = $field->getClean();
                switch ($op) {
                case 'eq':
                case null:
                    $expr[] = ($wval == $value && $field->isVisible());
                }
            }
        }
        $glue = $Q->isOred()
            ? function($a, $b) { return $a || $b; }
            : function($a, $b) { return $a && $b; };
        $initial = !$Q->isOred();
        $expression = array_reduce($expr, $glue, $initial);
        if ($Q->isNegated)
            $expression = !$expression;
        return $expression;
    }

    function getAllFields(Q $Q, &$fields=array()) {
        foreach ($Q->constraints as $c=>$value) {
            if ($c instanceof Q) {
                $this->getAllFields($c, $fields);
            }
            else {
                list($f, $op) = explode('__', $c, 2);
                $fields[$f] = true;
            }
        }
        return array_keys($fields);
    }

    function compileQ($Q, $form) {
        $expr = array();
        foreach ($Q->constraints as $c=>$value) {
            if ($value instanceof Q) {
                $expr[] = $this->compileQ($value, $form);
            }
            else {
                list($f, $op) = explode('__', $c, 2);
                $widget = $form->getField($f)->getWidget();
                $id = $widget->id;
                switch ($op) {
                case 'eq':
                case null:
                    $expr[] = sprintf('(%s.is(":visible") && %s)',
                            $id,
                            sprintf('%s == %s',
                                sprintf($widget->getJsValueGetter(), $id),
                                JsonDataEncoder::encode($value))
                            );
                }
            }
        }
        $glue = $Q->isOred() ? ' || ' : ' && ';
        $expression = implode($glue, $expr);
        if (count($expr) > 1)
            $expression = '('.$expression.')';
        if ($Q->isNegated)
            $expression = '!'.$expression;
        return $expression;
    }
}

class Q {
    const NEGATED = 0x0001;
    const ANY =     0x0002;

    var $constraints;
    var $flags;
    var $negated = false;
    var $ored = false;

    function __construct($filter, $flags=0) {
        $this->constraints = $filter;
        $this->negated = $flags & self::NEGATED;
        $this->ored = $flags & self::ANY;
    }

    function isNegated() {
        return $this->negated;
    }

    function isOred() {
        return $this->ored;
    }

    function negate() {
        $this->negated = !$this->negated;
        return $this;
    }

    static function not(array $constraints) {
        return new static($constraints, self::NEGATED);
    }

    static function any(array $constraints) {
        return new static($constraints, self::ORED);
    }
}

?>