--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/calendar/lib/calendar_ui.php	Sat Jan 13 08:56:12 2018 -0500
@@ -0,0 +1,883 @@
+<?php
+/**
+ * User Interface class for the Calendar plugin
+ *
+ * @author Lazlo Westerhof <hello@lazlo.me>
+ * @author Thomas Bruederli <bruederli@kolabsys.com>
+ *
+ * Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
+ * Copyright (C) 2014, Kolab Systems AG <contact@kolabsys.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+class calendar_ui
+{
+  private $rc;
+  private $cal;
+  private $ready = false;
+  public $screen;
+
+  function __construct($cal)
+  {
+    $this->cal = $cal;
+    $this->rc = $cal->rc;
+    $this->screen = $this->rc->task == 'calendar' ? ($this->rc->action ? $this->rc->action: 'calendar') : 'other';
+  }
+    
+  /**
+   * Calendar UI initialization and requests handlers
+   */
+  public function init()
+  {
+    if ($this->ready)  // already done
+      return;
+      
+    // add taskbar button
+    $this->cal->add_button(array(
+      'command'    => 'calendar',
+      'class'      => 'button-calendar',
+      'classsel'   => 'button-calendar button-selected',
+      'innerclass' => 'button-inner',
+      'label'      => 'calendar.calendar',
+      'type'       => 'link'
+      ), 'taskbar');
+    
+    // load basic client script
+    $this->cal->include_script('calendar_base.js');
+    
+    $skin_path = $this->cal->local_skin_path();
+    $this->cal->include_stylesheet($skin_path . '/calendar.css');
+    
+    $this->ready = true;
+  }
+
+  /**
+   * Register handler methods for the template engine
+   */
+  public function init_templates()
+  {
+    $this->cal->register_handler('plugin.calendar_css', array($this, 'calendar_css'));
+    $this->cal->register_handler('plugin.calendar_list', array($this, 'calendar_list'));
+    $this->cal->register_handler('plugin.calendar_select', array($this, 'calendar_select'));
+    $this->cal->register_handler('plugin.identity_select', array($this, 'identity_select'));
+    $this->cal->register_handler('plugin.category_select', array($this, 'category_select'));
+    $this->cal->register_handler('plugin.status_select', array($this, 'status_select'));
+    $this->cal->register_handler('plugin.freebusy_select', array($this, 'freebusy_select'));
+    $this->cal->register_handler('plugin.priority_select', array($this, 'priority_select'));
+    $this->cal->register_handler('plugin.sensitivity_select', array($this, 'sensitivity_select'));
+    $this->cal->register_handler('plugin.alarm_select', array($this, 'alarm_select'));
+    $this->cal->register_handler('plugin.recurrence_form', array($this->cal->lib, 'recurrence_form'));
+    $this->cal->register_handler('plugin.attachments_form', array($this, 'attachments_form'));
+    $this->cal->register_handler('plugin.attachments_list', array($this, 'attachments_list'));
+    $this->cal->register_handler('plugin.filedroparea', array($this, 'file_drop_area'));
+    $this->cal->register_handler('plugin.attendees_list', array($this, 'attendees_list'));
+    $this->cal->register_handler('plugin.attendees_form', array($this, 'attendees_form'));
+    $this->cal->register_handler('plugin.resources_form', array($this, 'resources_form'));
+    $this->cal->register_handler('plugin.resources_list', array($this, 'resources_list'));
+    $this->cal->register_handler('plugin.resources_searchform', array($this, 'resources_search_form'));
+    $this->cal->register_handler('plugin.resource_info', array($this, 'resource_info'));
+    $this->cal->register_handler('plugin.resource_calendar', array($this, 'resource_calendar'));
+    $this->cal->register_handler('plugin.attendees_freebusy_table', array($this, 'attendees_freebusy_table'));
+    $this->cal->register_handler('plugin.edit_attendees_notify', array($this, 'edit_attendees_notify'));
+    $this->cal->register_handler('plugin.edit_recurring_warning', array($this, 'recurring_event_warning'));
+    $this->cal->register_handler('plugin.event_rsvp_buttons', array($this, 'event_rsvp_buttons'));
+    $this->cal->register_handler('plugin.angenda_options', array($this, 'angenda_options'));
+    $this->cal->register_handler('plugin.events_import_form', array($this, 'events_import_form'));
+    $this->cal->register_handler('plugin.events_export_form', array($this, 'events_export_form'));
+    $this->cal->register_handler('plugin.object_changelog_table', array('libkolab', 'object_changelog_table'));
+    $this->cal->register_handler('plugin.searchform', array($this->rc->output, 'search_form'));  // use generic method from rcube_template
+  }
+
+  /**
+   * Adds CSS stylesheets to the page header
+   */
+  public function addCSS()
+  {
+    $skin_path = $this->cal->local_skin_path();
+    $this->cal->include_stylesheet($skin_path . '/fullcalendar.css');
+  }
+
+  /**
+   * Adds JS files to the page header
+   */
+  public function addJS()
+  {
+    $this->cal->include_script('calendar_ui.js');
+    $this->cal->include_script('lib/js/fullcalendar.js');
+    $this->rc->output->include_script('treelist.js');
+
+    // include kolab folderlist widget if available
+    if (in_array('libkolab', $this->cal->api->loaded_plugins())) {
+        $this->cal->api->include_script('libkolab/js/folderlist.js');
+        $this->cal->api->include_script('libkolab/js/audittrail.js');
+    }
+
+    jqueryui::miniColors();
+  }
+
+  /**
+   *
+   */
+  function calendar_css($attrib = array())
+  {
+    $mode = $this->rc->config->get('calendar_event_coloring', $this->cal->defaults['calendar_event_coloring']);
+    $categories = $this->cal->driver->list_categories();
+    $css = "\n";
+    
+    foreach ((array)$categories as $class => $color) {
+      if (empty($color))
+        continue;
+      
+      $class = 'cat-' . asciiwords(strtolower($class), true);
+      $css  .= ".$class { color: #$color }\n";
+      if ($mode > 0) {
+        if ($mode == 2) {
+          $css .= ".fc-event-$class .fc-event-bg {";
+          $css .= " opacity: 0.9;";
+          $css .= " filter: alpha(opacity=90);";
+        }
+        else {
+          $css .= ".fc-event-$class.fc-event-skin, ";
+          $css .= ".fc-event-$class .fc-event-skin, ";
+          $css .= ".fc-event-$class .fc-event-inner {";
+        }
+        $css .= " background-color: #" . $color . ";";
+        if ($mode % 2)
+          $css .= " border-color: #$color;";
+        $css .= "}\n";
+      }
+    }
+    
+    $calendars = $this->cal->driver->list_calendars();
+    foreach ((array)$calendars as $id => $prop) {
+      if (!$prop['color'])
+        continue;
+      $css .= $this->calendar_css_classes($id, $prop, $mode);
+    }
+    
+    return html::tag('style', array('type' => 'text/css'), $css);
+  }
+
+  /**
+   *
+   */
+  public function calendar_css_classes($id, $prop, $mode)
+  {
+    $color = $prop['color'];
+    $class = 'cal-' . asciiwords($id, true);
+    $css .= "li .$class, #eventshow .$class { color: #$color; }\n";
+
+    if ($mode != 1) {
+      if ($mode == 3) {
+        $css .= ".fc-event-$class .fc-event-bg {";
+        $css .= " opacity: 0.9;";
+        $css .= " filter: alpha(opacity=90);";
+      }
+      else {
+        $css .= ".fc-event-$class, ";
+        $css .= ".fc-event-$class .fc-event-inner {";
+      }
+      if (!$prop['printmode'])
+        $css .= " background-color: #$color;";
+      if ($mode % 2 == 0)
+      $css .= " border-color: #$color;";
+      $css .= "}\n";
+    }
+
+    return $css . ".$class .handle { background-color: #$color; }\n";
+  }
+
+  /**
+   *
+   */
+  function calendar_list($attrib = array())
+  {
+    $html = '';
+    $jsenv = array();
+    $tree = true;
+    $calendars = $this->cal->driver->list_calendars(0, $tree);
+
+    // walk folder tree
+    if (is_object($tree)) {
+      $html = $this->list_tree_html($tree, $calendars, $jsenv, $attrib);
+
+      // append birthdays calendar which isn't part of $tree
+      if ($bdaycal = $calendars[calendar_driver::BIRTHDAY_CALENDAR_ID]) {
+        $calendars = array(calendar_driver::BIRTHDAY_CALENDAR_ID => $bdaycal);
+      }
+      else {
+        $calendars = array();  // clear array for flat listing
+      }
+    }
+    else {
+      // fall-back to flat folder listing
+      $attrib['class'] .= ' flat';
+    }
+
+    foreach ((array)$calendars as $id => $prop) {
+      if ($attrib['activeonly'] && !$prop['active'])
+        continue;
+
+      $html .= html::tag('li', array('id' => 'rcmlical' . $id, 'class' => $prop['group']),
+        $content = $this->calendar_list_item($id, $prop, $jsenv, $attrib['activeonly'])
+      );
+    }
+
+    $this->rc->output->set_env('source', rcube_utils::get_input_value('source', rcube_utils::INPUT_GET));
+    $this->rc->output->set_env('calendars', $jsenv);
+    $this->rc->output->add_gui_object('calendarslist', $attrib['id']);
+
+    return html::tag('ul', $attrib, $html, html::$common_attrib);
+  }
+
+  /**
+   * Return html for a structured list <ul> for the folder tree
+   */
+  public function list_tree_html($node, $data, &$jsenv, $attrib)
+  {
+    $out = '';
+    foreach ($node->children as $folder) {
+      $id = $folder->id;
+      $prop = $data[$id];
+      $is_collapsed = false; // TODO: determine this somehow?
+
+      $content = $this->calendar_list_item($id, $prop, $jsenv, $attrib['activeonly']);
+
+      if (!empty($folder->children)) {
+        $content .= html::tag('ul', array('style' => ($is_collapsed ? "display:none;" : null)),
+          $this->list_tree_html($folder, $data, $jsenv, $attrib));
+      }
+
+      if (strlen($content)) {
+        $out .= html::tag('li', array(
+            'id' => 'rcmlical' . rcube_utils::html_identifier($id),
+            'class' => $prop['group'] . ($prop['virtual'] ? ' virtual' : ''),
+          ),
+          $content);
+      }
+    }
+
+    return $out;
+  }
+
+  /**
+   * Helper method to build a calendar list item (HTML content and js data)
+   */
+  public function calendar_list_item($id, $prop, &$jsenv, $activeonly = false)
+  {
+    // enrich calendar properties with settings from the driver
+    if (!$prop['virtual']) {
+      unset($prop['user_id']);
+      $prop['alarms']      = $this->cal->driver->alarms;
+      $prop['attendees']   = $this->cal->driver->attendees;
+      $prop['freebusy']    = $this->cal->driver->freebusy;
+      $prop['attachments'] = $this->cal->driver->attachments;
+      $prop['undelete']    = $this->cal->driver->undelete;
+      $prop['feedurl']     = $this->cal->get_url(array('_cal' => $this->cal->ical_feed_hash($id) . '.ics', 'action' => 'feed'));
+
+      $jsenv[$id] = $prop;
+    }
+
+    $classes = array('calendar', 'cal-'  . asciiwords($id, true));
+    $title = $prop['title'] ?: ($prop['name'] != $prop['listname'] || strlen($prop['name']) > 25 ?
+      html_entity_decode($prop['name'], ENT_COMPAT, RCUBE_CHARSET) : '');
+
+    if ($prop['virtual'])
+      $classes[] = 'virtual';
+    else if (!$prop['editable'])
+      $classes[] = 'readonly';
+    if ($prop['subscribed'])
+      $classes[] = 'subscribed';
+    if ($prop['subscribed'] === 2)
+      $classes[] = 'partial';
+    if ($prop['class'])
+      $classes[] = $prop['class'];
+
+    $content = '';
+    if (!$activeonly || $prop['active']) {
+      $label_id = 'cl:' . $id;
+      $content = html::div(join(' ', $classes),
+        html::span(array('class' => 'calname', 'id' => $label_id, 'title' => $title), $prop['editname'] ? rcube::Q($prop['editname']) : $prop['listname']) .
+        ($prop['virtual'] ? '' :
+          html::tag('input', array('type' => 'checkbox', 'name' => '_cal[]', 'value' => $id, 'checked' => $prop['active'], 'aria-labelledby' => $label_id), '') .
+          html::span('actions', 
+            ($prop['removable'] ? html::a(array('href' => '#', 'class' => 'remove', 'title' => $this->cal->gettext('removelist')), ' ') : '') .
+            html::a(array('href' => '#', 'class' => 'quickview', 'title' => $this->cal->gettext('quickview'), 'role' => 'checkbox', 'aria-checked' => 'false'), '') .
+            (isset($prop['subscribed']) ? html::a(array('href' => '#', 'class' => 'subscribed', 'title' => $this->cal->gettext('calendarsubscribe'), 'role' => 'checkbox', 'aria-checked' => $prop['subscribed'] ? 'true' : 'false'), ' ') : '')
+          ) .
+          html::span(array('class' => 'handle', 'style' => "background-color: #" . ($prop['color'] ?: 'f00')), '&nbsp;')
+        )
+      );
+    }
+
+    return $content;
+  }
+
+  /**
+   *
+   */
+  function angenda_options($attrib = array())
+  {
+    $attrib += array('id' => 'agendaoptions');
+    $attrib['style'] .= 'display:none';
+    
+    $select_range = new html_select(array('name' => 'listrange', 'id' => 'agenda-listrange'));
+    $select_range->add(1 . ' ' . preg_replace('/\(.+\)/', '', $this->cal->lib->gettext('days')), $days);
+    foreach (array(2,5,7,14,30,60,90,180,365) as $days)
+      $select_range->add($days . ' ' . preg_replace('/\(|\)/', '', $this->cal->lib->gettext('days')), $days);
+    
+    $html .= html::label('agenda-listrange', $this->cal->gettext('listrange'));
+    $html .= $select_range->show($this->rc->config->get('calendar_agenda_range', $this->cal->defaults['calendar_agenda_range']));
+    
+    $select_sections = new html_select(array('name' => 'listsections', 'id' => 'agenda-listsections'));
+    $select_sections->add('---', '');
+    foreach (array('day' => 'libcalendaring.days', 'week' => 'libcalendaring.weeks', 'month' => 'libcalendaring.months', 'smart' => 'calendar.smartsections') as $val => $label)
+      $select_sections->add(preg_replace('/\(|\)/', '', ucfirst($this->rc->gettext($label))), $val);
+    
+    $html .= html::span('spacer', '&nbsp;');
+    $html .= html::label('agenda-listsections', $this->cal->gettext('listsections'));
+    $html .= $select_sections->show($this->rc->config->get('calendar_agenda_sections', $this->cal->defaults['calendar_agenda_sections']));
+    
+    return html::div($attrib, $html);
+  }
+
+  /**
+   * Render a HTML select box for calendar selection
+   */
+  function calendar_select($attrib = array())
+  {
+    $attrib['name']       = 'calendar';
+    $attrib['is_escaped'] = true;
+    $select = new html_select($attrib);
+
+    foreach ((array)$this->cal->driver->list_calendars() as $id => $prop) {
+      if ($prop['editable'] || strpos($prop['rights'], 'i') !== false)
+        $select->add($prop['name'], $id);
+    }
+
+    return $select->show(null);
+  }
+
+  /**
+   * Render a HTML select box for user identity selection
+   */
+  function identity_select($attrib = array())
+  {
+    $attrib['name'] = 'identity';
+    $select         = new html_select($attrib);
+    $identities     = $this->rc->user->list_emails();
+
+    foreach ($identities as $ident) {
+        $select->add(format_email_recipient($ident['email'], $ident['name']), $ident['identity_id']);
+    }
+
+    return $select->show(null);
+  }
+
+  /**
+   * Render a HTML select box to select an event category
+   */
+  function category_select($attrib = array())
+  {
+    $attrib['name'] = 'categories';
+    $select = new html_select($attrib);
+    $select->add('---', '');
+    foreach (array_keys((array)$this->cal->driver->list_categories()) as $cat) {
+      $select->add($cat, $cat);
+    }
+
+    return $select->show(null);
+  }
+
+  /**
+   * Render a HTML select box for status property
+   */
+  function status_select($attrib = array())
+  {
+    $attrib['name'] = 'status';
+    $select = new html_select($attrib);
+    $select->add('---', '');
+    $select->add($this->cal->gettext('status-confirmed'), 'CONFIRMED');
+    $select->add($this->cal->gettext('status-cancelled'), 'CANCELLED');
+    $select->add($this->cal->gettext('status-tentative'), 'TENTATIVE');
+    return $select->show(null);
+  }
+
+  /**
+   * Render a HTML select box for free/busy/out-of-office property
+   */
+  function freebusy_select($attrib = array())
+  {
+    $attrib['name'] = 'freebusy';
+    $select = new html_select($attrib);
+    $select->add($this->cal->gettext('free'), 'free');
+    $select->add($this->cal->gettext('busy'), 'busy');
+    // out-of-office is not supported by libkolabxml (#3220)
+    // $select->add($this->cal->gettext('outofoffice'), 'outofoffice');
+    $select->add($this->cal->gettext('tentative'), 'tentative');
+    return $select->show(null);
+  }
+
+  /**
+   * Render a HTML select for event priorities
+   */
+  function priority_select($attrib = array())
+  {
+    $attrib['name'] = 'priority';
+    $select = new html_select($attrib);
+    $select->add('---', '0');
+    $select->add('1 '.$this->cal->gettext('highest'), '1');
+    $select->add('2 '.$this->cal->gettext('high'),    '2');
+    $select->add('3 ',                                '3');
+    $select->add('4 ',                                '4');
+    $select->add('5 '.$this->cal->gettext('normal'),  '5');
+    $select->add('6 ',                                '6');
+    $select->add('7 ',                                '7');
+    $select->add('8 '.$this->cal->gettext('low'),     '8');
+    $select->add('9 '.$this->cal->gettext('lowest'),  '9');
+    return $select->show(null);
+  }
+  
+  /**
+   * Render HTML input for sensitivity selection
+   */
+  function sensitivity_select($attrib = array())
+  {
+    $attrib['name'] = 'sensitivity';
+    $select = new html_select($attrib);
+    $select->add($this->cal->gettext('public'), 'public');
+    $select->add($this->cal->gettext('private'), 'private');
+    $select->add($this->cal->gettext('confidential'), 'confidential');
+    return $select->show(null);
+  }
+  
+  /**
+   * Render HTML form for alarm configuration
+   */
+  function alarm_select($attrib = array())
+  {
+    return $this->cal->lib->alarm_select($attrib, $this->cal->driver->alarm_types, $this->cal->driver->alarm_absolute);
+  }
+
+  /**
+   *
+   */
+  function edit_attendees_notify($attrib = array())
+  {
+    $checkbox = new html_checkbox(array('name' => '_notify', 'id' => 'edit-attendees-donotify', 'value' => 1));
+    return html::div($attrib, html::label(null, $checkbox->show(1) . ' ' . $this->cal->gettext('sendnotifications')));
+  }
+
+  /**
+   * Generate the form for recurrence settings
+   */
+  function recurring_event_warning($attrib = array())
+  {
+    $attrib['id'] = 'edit-recurring-warning';
+    
+    $radio = new html_radiobutton(array('name' => '_savemode', 'class' => 'edit-recurring-savemode'));
+    $form = html::label(null, $radio->show('', array('value' => 'current')) . $this->cal->gettext('currentevent')) . ' ' .
+       html::label(null, $radio->show('', array('value' => 'future')) . $this->cal->gettext('futurevents')) . ' ' .
+       html::label(null, $radio->show('all', array('value' => 'all')) . $this->cal->gettext('allevents')) . ' ' .
+       html::label(null, $radio->show('', array('value' => 'new')) . $this->cal->gettext('saveasnew'));
+       
+    return html::div($attrib, html::div('message', html::span('ui-icon ui-icon-alert', '') . $this->cal->gettext('changerecurringeventwarning')) . html::div('savemode', $form));
+  }
+
+  /**
+   * Form for uploading and importing events
+   */
+  function events_import_form($attrib = array())
+  {
+    if (!$attrib['id'])
+      $attrib['id'] = 'rcmImportForm';
+
+    // Get max filesize, enable upload progress bar
+    $max_filesize = $this->rc->upload_init();
+
+    $accept = '.ics, text/calendar, text/x-vcalendar, application/ics';
+    if (class_exists('ZipArchive', false)) {
+      $accept .= ', .zip, application/zip';
+    }
+
+    $input = new html_inputfield(array(
+      'type' => 'file', 'name' => '_data', 'size' => $attrib['uploadfieldsize'],
+      'accept' => $accept));
+
+    $select = new html_select(array('name' => '_range', 'id' => 'event-import-range'));
+    $select->add(array(
+        $this->cal->gettext('onemonthback'),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>2))),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>3))),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>6))),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>12))),
+        $this->cal->gettext('all'),
+      ),
+      array('1','2','3','6','12',0));
+
+    $html .= html::div('form-section',
+      html::div(null, $input->show()) .
+      html::div('hint', $this->rc->gettext(array('name' => 'maxuploadsize', 'vars' => array('size' => $max_filesize))))
+    );
+
+    $html .= html::div('form-section',
+      html::label('event-import-calendar', $this->cal->gettext('calendar')) .
+      $this->calendar_select(array('name' => 'calendar', 'id' => 'event-import-calendar'))
+    );
+
+    $html .= html::div('form-section',
+      html::label('event-import-range', $this->cal->gettext('importrange')) .
+      $select->show(1)
+    );
+
+    $this->rc->output->add_gui_object('importform', $attrib['id']);
+    $this->rc->output->add_label('import');
+
+    return html::tag('form', array('action' => $this->rc->url(array('task' => 'calendar', 'action' => 'import_events')),
+      'method' => "post", 'enctype' => 'multipart/form-data', 'id' => $attrib['id']),
+      $html
+    );
+  }
+
+  /**
+   * Form to select options for exporting events
+   */
+  function events_export_form($attrib = array())
+  {
+    if (!$attrib['id'])
+      $attrib['id'] = 'rcmExportForm';
+
+    $html .= html::div('form-section',
+      html::label('event-export-calendar', $this->cal->gettext('calendar')) .
+      $this->calendar_select(array('name' => 'calendar', 'id' => 'event-export-calendar'))
+    );
+
+    $select = new html_select(array('name' => 'range', 'id' => 'event-export-range'));
+    $select->add(array(
+        $this->cal->gettext('all'),
+        $this->cal->gettext('onemonthback'),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>2))),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>3))),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>6))),
+        $this->cal->gettext(array('name' => 'nmonthsback', 'vars' => array('nr'=>12))),
+        $this->cal->gettext('customdate'),
+      ),
+      array(0,'1','2','3','6','12','custom'));
+
+    $startdate = new html_inputfield(array('name' => 'start', 'size' => 11, 'id' => 'event-export-startdate'));
+
+    $html .= html::div('form-section',
+      html::label('event-export-range', $this->cal->gettext('exportrange')) .
+      $select->show(0) .
+      html::span(array('style'=>'display:none'), $startdate->show())
+    );
+
+    $checkbox = new html_checkbox(array('name' => 'attachments', 'id' => 'event-export-attachments', 'value' => 1));
+    $html .= html::div('form-section',
+      html::label('event-export-attachments', $this->cal->gettext('exportattachments')) .
+      $checkbox->show(1)
+    );
+
+    $this->rc->output->add_gui_object('exportform', $attrib['id']);
+
+    return html::tag('form', array('action' => $this->rc->url(array('task' => 'calendar', 'action' => 'export_events')),
+      'method' => "post", 'id' => $attrib['id']),
+      $html
+    );
+  }
+
+  /**
+   * Generate the form for event attachments upload
+   */
+  function attachments_form($attrib = array())
+  {
+    // add ID if not given
+    if (!$attrib['id'])
+      $attrib['id'] = 'rcmUploadForm';
+
+    // Get max filesize, enable upload progress bar
+    $max_filesize = $this->rc->upload_init();
+
+    $button = new html_inputfield(array('type' => 'button'));
+    $input = new html_inputfield(array(
+      'type' => 'file', 'name' => '_attachments[]',
+      'multiple' => 'multiple', 'size' => $attrib['attachmentfieldsize']));
+
+    return html::div($attrib,
+      html::div(null, $input->show()) .
+      html::div('buttons', $button->show($this->rc->gettext('upload'), array('class' => 'button mainaction',
+        'onclick' => rcmail_output::JS_OBJECT_NAME . ".upload_file(this.form)"))) .
+      html::div('hint', $this->rc->gettext(array('name' => 'maxuploadsize', 'vars' => array('size' => $max_filesize))))
+    );
+  }
+
+  /**
+   * Register UI object for HTML5 drag & drop file upload
+   */
+  function file_drop_area($attrib = array())
+  {
+      if ($attrib['id']) {
+          $this->rc->output->add_gui_object('filedrop', $attrib['id']);
+          $this->rc->output->set_env('filedrop', array('action' => 'upload', 'fieldname' => '_attachments'));
+      }
+  }
+
+  /**
+   * Generate HTML element for attachments list
+   */
+  function attachments_list($attrib = array())
+  {
+    if (!$attrib['id'])
+      $attrib['id'] = 'rcmAttachmentList';
+
+    $skin_path = $this->cal->local_skin_path();
+    if ($attrib['deleteicon']) {
+      $_SESSION[calendar::SESSION_KEY . '_deleteicon'] = $skin_path . $attrib['deleteicon'];
+      $this->rc->output->set_env('deleteicon', $skin_path . $attrib['deleteicon']);
+    }
+    if ($attrib['cancelicon'])
+      $this->rc->output->set_env('cancelicon', $skin_path . $attrib['cancelicon']);
+    if ($attrib['loadingicon'])
+      $this->rc->output->set_env('loadingicon', $skin_path . $attrib['loadingicon']);
+
+    $this->rc->output->add_gui_object('attachmentlist', $attrib['id']);
+    $this->attachmentlist_id = $attrib['id'];
+
+    return html::tag('ul', $attrib, '', html::$common_attrib);
+  }
+
+  /**
+   * Handler for calendar form template.
+   * The form content could be overriden by the driver
+   */
+  function calendar_editform($action, $calendar = array())
+  {
+    // compose default calendar form fields
+    $input_name = new html_inputfield(array('name' => 'name', 'id' => 'calendar-name', 'size' => 20));
+    $input_color = new html_inputfield(array('name' => 'color', 'id' => 'calendar-color', 'size' => 6));
+
+    $formfields = array(
+      'name' => array(
+        'label' => $this->cal->gettext('name'),
+        'value' => $input_name->show($calendar['name']),
+        'id' => 'calendar-name',
+      ),
+      'color' => array(
+        'label' => $this->cal->gettext('color'),
+        'value' => $input_color->show($calendar['color']),
+        'id' => 'calendar-color',
+      ),
+    );
+
+    if ($this->cal->driver->alarms) {
+      $checkbox = new html_checkbox(array('name' => 'showalarms', 'id' => 'calendar-showalarms', 'value' => 1));
+      $formfields['showalarms'] = array(
+        'label' => $this->cal->gettext('showalarms'),
+        'value' => $checkbox->show($calendar['showalarms']?1:0),
+        'id' => 'calendar-showalarms',
+      );
+    }
+
+    // allow driver to extend or replace the form content
+    return html::tag('form', array('action' => "#", 'method' => "get", 'id' => 'calendarpropform'),
+      $this->cal->driver->calendar_form($action, $calendar, $formfields)
+    );
+  }
+
+  /**
+   *
+   */
+  function attendees_list($attrib = array())
+  {
+    // add "noreply" checkbox to attendees table only
+    $invitations = strpos($attrib['id'], 'attend') !== false;
+
+    $invite = new html_checkbox(array('value' => 1, 'id' => 'edit-attendees-invite'));
+    $table  = new html_table(array('cols' => 5 + intval($invitations), 'border' => 0, 'cellpadding' => 0, 'class' => 'rectable'));
+
+    $table->add_header('role', $this->cal->gettext('role'));
+    $table->add_header('name', $this->cal->gettext($attrib['coltitle'] ?: 'attendee'));
+    $table->add_header('availability', $this->cal->gettext('availability'));
+    $table->add_header('confirmstate', $this->cal->gettext('confirmstate'));
+    if ($invitations) {
+      $table->add_header(array('class' => 'invite', 'title' => $this->cal->gettext('sendinvitations')),
+        $invite->show(1) . html::label('edit-attendees-invite', $this->cal->gettext('sendinvitations')));
+    }
+    $table->add_header('options', '');
+
+    // hide invite column if disabled by config
+    $itip_notify = (int)$this->rc->config->get('calendar_itip_send_option', $this->cal->defaults['calendar_itip_send_option']);
+    if ($invitations && !($itip_notify & 2)) {
+        $css = sprintf('#%s td.invite, #%s th.invite { display:none !important }', $attrib['id'], $attrib['id']);
+        $this->rc->output->add_footer(html::tag('style', array('type' => 'text/css'), $css));
+    }
+
+    return $table->show($attrib);
+  }
+
+  /**
+   *
+   */
+  function attendees_form($attrib = array())
+  {
+    $input    = new html_inputfield(array('name' => 'participant', 'id' => 'edit-attendee-name', 'size' => 30));
+    $textarea = new html_textarea(array('name' => 'comment', 'id' => 'edit-attendees-comment',
+        'rows' => 4, 'cols' => 55, 'title' => $this->cal->gettext('itipcommenttitle')));
+
+    return html::div($attrib,
+      html::div(null, $input->show() . " " .
+        html::tag('input', array('type' => 'button', 'class' => 'button', 'id' => 'edit-attendee-add', 'value' => $this->cal->gettext('addattendee'))) . " " .
+        html::tag('input', array('type' => 'button', 'class' => 'button', 'id' => 'edit-attendee-schedule', 'value' => $this->cal->gettext('scheduletime').'...'))) .
+      html::p('attendees-commentbox', html::label(null, $this->cal->gettext('itipcomment') . $textarea->show()))
+    );
+  }
+
+  /**
+   *
+   */
+  function resources_form($attrib = array())
+  {
+    $input = new html_inputfield(array('name' => 'resource', 'id' => 'edit-resource-name', 'size' => 30));
+
+    return html::div($attrib,
+      html::div(null, $input->show() . " " .
+        html::tag('input', array('type' => 'button', 'class' => 'button', 'id' => 'edit-resource-add', 'value' => $this->cal->gettext('addresource'))) . " " .
+        html::tag('input', array('type' => 'button', 'class' => 'button', 'id' => 'edit-resource-find', 'value' => $this->cal->gettext('findresources').'...')))
+      );
+  }
+
+  /**
+   *
+   */
+  function resources_list($attrib = array())
+  {
+    $attrib += array('id' => 'calendar-resources-list');
+
+    $this->rc->output->add_gui_object('resourceslist', $attrib['id']);
+
+    return html::tag('ul', $attrib, '', html::$common_attrib);
+  }
+
+  /**
+   *
+   */
+  public function resource_info($attrib = array())
+  {
+    $attrib += array('id' => 'calendar-resources-info');
+
+    $this->rc->output->add_gui_object('resourceinfo', $attrib['id']);
+    $this->rc->output->add_gui_object('resourceownerinfo', $attrib['id'] . '-owner');
+
+    // copy address book labels for owner details to client
+    $this->rc->output->add_label('name','firstname','surname','department','jobtitle','email','phone','address');
+
+    $table_attrib = array('id','class','style','width','summary','cellpadding','cellspacing','border');
+
+    return html::tag('table', $attrib,
+        html::tag('tbody', null, ''), $table_attrib) .
+
+      html::tag('table', array('id' => $attrib['id'] . '-owner', 'style' => 'display:none') + $attrib,
+        html::tag('thead', null,
+          html::tag('tr', null,
+            html::tag('td', array('colspan' => 2), rcube::Q($this->cal->gettext('resourceowner')))
+          )
+        ) .
+        html::tag('tbody', null, ''),
+        $table_attrib);
+  }
+
+  /**
+   *
+   */
+  public function resource_calendar($attrib = array())
+  {
+    $attrib += array('id' => 'calendar-resources-calendar');
+
+    $this->rc->output->add_gui_object('resourceinfocalendar', $attrib['id']);
+
+    return html::div($attrib, '');
+  }
+
+  /**
+   * GUI object 'searchform' for the resource finder dialog
+   *
+   * @param array Named parameters
+   * @return string HTML code for the gui object
+   */
+  function resources_search_form($attrib)
+  {
+    $attrib += array('command' => 'search-resource', 'id' => 'rcmcalresqsearchbox', 'autocomplete' => 'off');
+    $attrib['name'] = '_q';
+
+    $input_q = new html_inputfield($attrib);
+    $out = $input_q->show();
+
+    // add form tag around text field
+    $out = $this->rc->output->form_tag(array(
+      'name' => "rcmcalresoursqsearchform",
+      'onsubmit' => rcmail_output::JS_OBJECT_NAME . ".command('" . $attrib['command'] . "'); return false",
+      'style' => "display:inline"),
+      $out);
+
+    return $out;
+  }
+
+  /**
+   *
+   */
+  function attendees_freebusy_table($attrib = array())
+  {
+    $table = new html_table(array('cols' => 2, 'border' => 0, 'cellspacing' => 0));
+    $table->add('attendees',
+      html::tag('h3', 'boxtitle', $this->cal->gettext('tabattendees')) .
+      html::div('timesheader', '&nbsp;') .
+      html::div(array('id' => 'schedule-attendees-list', 'class' => 'attendees-list'), '')
+    );
+    $table->add('times',
+      html::div('scroll',
+        html::tag('table', array('id' => 'schedule-freebusy-times', 'border' => 0, 'cellspacing' => 0), html::tag('thead') . html::tag('tbody')) .
+        html::div(array('id' => 'schedule-event-time', 'style' => 'display:none'), '&nbsp;')
+      )
+    );
+    
+    return $table->show($attrib);
+  }
+
+  /**
+   *
+   */
+  function event_invitebox($attrib = array())
+  {
+    if ($this->cal->event) {
+      return html::div($attrib,
+        $this->cal->itip->itip_object_details_table($this->cal->event, $this->cal->itip->gettext('itipinvitation')) .
+        $this->cal->invitestatus
+      );
+    }
+    
+    return '';
+  }
+
+  function event_rsvp_buttons($attrib = array())
+  {
+    $actions = array('accepted','tentative','declined');
+    if ($attrib['delegate'] !== 'false')
+      $actions[] = 'delegated';
+
+    return $this->cal->itip->itip_rsvp_buttons($attrib, $actions);
+  }
+
+}