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	/**
	* Roundcube webmail functions for the Elastic skin
	*
	* Copyright (c) 2017, The Roundcube Dev Team
	*
	* The contents are subject to the Creative Commons Attribution-ShareAlike
	* License. It is allowed to copy, distribute, transmit and to adapt the work
	* by keeping credits to the original autors in the README file.
	* See http://creativecommons.org/licenses/by-sa/3.0/ for details.
	*
	* @license magnet:?xt=urn:btih:90dc5c0be029de84e523b9b3922520e79e0e6f08&dn=cc0.txt CC0-1.0
	*/

	"use strict";

	function rcube_elastic_ui()
	{
	var ref = this,
	mode = 'normal', // one of: large, normal, small, phone
	touch = false,
	is_framed = rcmail.is_framed(),
	env = {
	config: {
	standard_windows: rcmail.env.standard_windows,
	message_extwin: rcmail.env.message_extwin,
	compose_extwin: rcmail.env.compose_extwin,
	help_open_extwin: rcmail.env.help_open_extwin
	},
	small_screen_config: {
	standard_windows: true,
	message_extwin: false,
	compose_extwin: false,
	help_open_extwin: false
	}
	},
	menus = {},
	content_buttons = [],
	frame_buttons = [],
	layout = {
	menu: $('#layout > .menu'),
	sidebar: $('#layout > .sidebar'),
	list: $('#layout > .list'),
	content: $('#layout > .content'),
	},
	buttons = {
	menu: $('a.menu-button'),
	back_sidebar: $('a.back-sidebar-button'),
	back_list: $('a.back-list-button'),
	back_content: $('a.back-content-button'),
	};


	// Public methods
	this.register_content_buttons = register_content_buttons;
	this.menu_hide = menu_hide;
	this.menu_toggle = menu_toggle;
	this.popup_init = popup_init;
	this.about_dialog = about_dialog;
	this.headers_dialog = headers_dialog;
	this.headers_show = headers_show;
	this.spellmenu = spellmenu;
	this.searchmenu = searchmenu;
	this.headersmenu = headersmenu;
	this.attachmentmenu = attachmentmenu;
	this.mailtomenu = mailtomenu;
	this.show_list = show_list;
	this.show_sidebar = show_sidebar;
	this.smart_field_init = smart_field_init;
	this.smart_field_reset = smart_field_reset;
	this.form_errors = form_errors;
	this.switch_nav_list = switch_nav_list;


	// Initialize layout
	layout_init();

	// Convert some elements to Bootstrap style
	bootstrap_style();

	// Initialize responsive toolbars (have to be before popups init)
	toolbar_init();

	// Initialize content frame and list handlers
	content_frame_init();

	// Initialize menu dropdowns
	dropdowns_init();

	// Setup various UI elements
	setup();

	// Update layout after initialization
	resize();


	/**
	* Setup procedure
	*/
	function setup()
	{
	var title, form, content_buttons = [];

	// Initialize search forms (in list headers)
	$('.header > .searchbar').each(function() { searchbar_init(this); });
	$('.header > .searchfilterbar').each(function() { searchfilterbar_init(this); });

	// Intercept jQuery-UI dialogs to re-style them
	if ($.ui) {
	$.widget('ui.dialog', $.ui.dialog, {
	open: function() {
	this._super();
	dialog_open(this);
	return this;
	}
	});
	}

	// menu/sidebar/list button
	buttons.menu.on('click', function() { show_menu(); return false; });
	buttons.back_sidebar.on('click', function() { show_sidebar(); return false; });
	buttons.back_list.on('click', function() { show_list(); return false; });
	buttons.back_content.on('click', function() { show_content(true); return false; });

	$('body').on('click', function() { if (mode == 'phone') layout.menu.addClass('hidden'); });

	// Set content frame title in parent window (exclude ext-windows and dialog frames)
	if (is_framed && !rcmail.env.extwin && !parent.$('.ui-dialog:visible').length) {
	if (title = $('h1.voice:first').text()) {
	parent.$('#layout > .content > .header > .header-title:not(.constant)').text(title);
	}
	}
	else if (!is_framed) {
	title = $('.boxtitle:first', layout.content).detach().text();

	if (!title) {
	title = $('h1.voice:first').text();
	}

	if (title) {
	$('.header > .header-title', layout.content).text(title);
	}
	}

	// Add content frame toolbar in the footer, for content buttons and navigation
	if (!is_framed && layout.content.length && !$(layout.content).is('.no-navbar')
	&& !$(layout.content).children('.frame-content').length
	) {
	env.frame_nav = $('<div class="footer toolbar content-frame-navigation hide-nav-buttons">')
	.append($('<a class="button prev">')
	.append($('<span class="inner"></span>').text(rcmail.gettext('previous'))))
	.append($('<span class="buttons">'))
	.append($('<a class="button next">')
	.append($('<span class="inner"></span>').text(rcmail.gettext('next'))))
	.appendTo(layout.content);
	}

	// Move some buttons to the frame footer toolbar
	$('a[data-content-button]').each(function() {
	content_buttons.push(create_cloned_button($(this)));
	});

	// Move form buttons from the content frame into the frame footer (on parent window)
	$('.formbuttons').children().each(function() {
	var target = $(this);

	// skip non-content buttons
	if (!is_framed && !target.parents('.content').length) {
	return;
	}

	if (target.is('.cancel')) {
	target.addClass('hidden');
	return;
	}

	content_buttons.push(create_cloned_button(target));
	});

	(is_framed ? parent.UI : ref).register_content_buttons(content_buttons);

	$('[data-recipient-input]').each(function() { recipient_input(this); });
	$('.image-upload').each(function() { image_upload_input(this); });

	// Mail compose features
	if (form = rcmail.gui_objects.messageform) {
	form = $('form[name="' + form + '"]');
	// Show input elements with non-empty value
	// These event handlers need to be registered before rcmail 'init' event
	$('#_cc, #_bcc, #_replyto, #_followupto', $('.compose-headers')).each(function() {
	$(this).on('change', function() {
	$('#compose' + $(this).attr('id'))[this.value ? 'removeClass' : 'addClass']('hidden');
	});
	});

	// We put compose options outside of the main form
	// Because IE/Edge (<16) does not support 'form' attribute we'll copy
	// inputs into the main form as hidden fields
	// TODO: Consider doing this for IE/Edge only, just set the 'form' attribute on others
	$('#compose-options').find('textarea,input,select').each(function() {
	var hidden = $('<input>')
	.attr({type: 'hidden', name: $(this).attr('name')})
	.appendTo(form);

	$(this).attr('tabindex', 2)
	.on('change', function() {
	hidden.val(this.type != 'checkbox' \|\| this.checked ? $(this).val() : '');
	})
	.change();
	});
	}

	// Add HTML/Plain tabs (switch) on top of textarea with TinyMCE editor
	$('textarea[data-html-editor]').each(function() { html_editor_init(this); });

	$('#dragmessage-menu,#dragcontact-menu').each(function() {
	rcmail.gui_object('dragmenu', this.id);
	});

	// Taskmenu items added by plugins do not use elastic classes (e.g help plugin)
	// it's for larry skin compat. We'll assign 'button', 'selected' and icon-specific class.
	$('#taskmenu > a').each(function() {
	if (/button-([a-z]+)/.test(this.className)) {
	var data, name = RegExp.$1,
	button = find_button(this.id);

	if (button && (data = button.data)) {
	if (data.sel) {
	data.sel += ' button ' + name;
	data.sel = data.sel.replace('button-selected', 'selected');
	}

	if (data.act) {
	data.act += ' button ' + name;
	}

	rcmail.buttons[button.command][button.index] = data;
	rcmail.init_button(button.command, data);
	}

	$(this).addClass('button ' + name);
	$('.button-inner', this).addClass('inner');
	}
	});

	// Some plugins use 'listbubtton' class, we'll replace it with 'button'
	$('.listbutton').each(function() {
	var button = find_button(this.id);

	$(this).addClass('button').removeClass('listbutton');

	if (button.data.sel) {
	button.data.sel = button.data.sel.replace('listbutton', 'button');
	}
	if (button.data.act) {
	button.data.act = button.data.act.replace('listbutton', 'button');
	}

	rcmail.buttons[button.command][button.index] = button.data;
	rcmail.init_button(button.command, button.data);
	});

	// buttons that should be hidden on small screen devices
	$('a[data-hidden],button[data-hidden]').each(function() {
	var parent = $(this).parent('li'),
	sizes = $(this).data('hidden').split(',');

	$(parent.length ? parent : this).addClass('hidden-' + sizes.join(' hidden-'));
	});

	// Modify normal checkboxes on lists so they are different
	// than those used for row selection, i.e. use icons
	$('[data-list]').each(function() {
	$('input[type=checkbox]', this).each(function() { pretty_checkbox(this); });
	});


	// Assign .formcontainer class to the iframe body, when it
	// contains .formcontent and .formbuttons.
	if (is_framed) {
	$('.formcontent').each(function() {
	if ($(this).next('.formbuttons').length) {
	$(this).parent().addClass('formcontainer');
	}
	});
	}

	// move "Download all attachments" button into a better location
	$('#attachment-list + a.zipdownload').appendTo('.header-links');
	};

	/**
	* Moves form buttons into the content frame actions toolbar (for mobile)
	*/
	function register_content_buttons(buttons)
	{
	// we need these buttons really only in phone mode
	if (/mode == 'phone' && / env.frame_nav && buttons && buttons.length) {
	var toolbar = env.frame_nav.children('.buttons');

	content_buttons = [];
	$.each(buttons, function() {
	if (this.data('target')) {
	content_buttons.push(this.data('target'));
	}
	});

	toolbar.html('').append(buttons);
	}
	};

	/**
	* Registers cloned button
	*/
	function register_cloned_button(old_id, new_id, active_class)
	{
	var button = find_button(old_id);
	if (button) {
	rcmail.register_button(button.command, new_id, button.data.type, active_class, button.data.sel);
	}
	};

	/**
	* Create a button clone for use in toolbar
	*/
	function create_cloned_button(target, is_ext)
	{
	var button = $('<a>'),
	target_id = target.attr('id'),
	button_id = target_id + '-clone',
	btn_class = target[0].className;

	btn_class = $.trim(btn_class.replace('btn-primary', 'primary').replace(/(btn[a-z-]*\|button\|disabled)/g, ''))
	btn_class += ' button disabled';

	button.attr({'onclick': '', id: button_id, href: '#', 'class': btn_class})
	.append($('<span class="inner">').text(target.text()))
	.on('click', function(e) { target.click(); });

	if (is_framed) {
	button.data('target', target);
	frame_buttons.push($.extend({button_id: button_id}, find_button(target[0].id)));
	}
	else {
	// Register the button to get active state updates
	register_cloned_button(target_id, button_id, btn_class.replace(' disabled', ''));
	}

	return button;
	};

	/**
	* Finds an rcmail button
	*/
	function find_button(id)
	{
	var i, button, command;

	for (command in rcmail.buttons) {
	for (i = 0; i < rcmail.buttons[command].length; i++) {
	button = rcmail.buttons[command][i];
	if (button.id == id) {
	return {
	command: command,
	index: i,
	data: button
	};
	}
	}
	}
	};

	/**
	* Setup environment
	*/
	function layout_init()
	{
	// Select current layout element
	env.last_selected = $('#layout > div.selected')[0];
	if (!env.last_selected && layout.content.length) {
	$.each(['sidebar', 'list', 'content'], function() {
	if (layout[this].length) {
	env.last_selected = layout[this][0];
	layout[this].addClass('selected');
	return false;
	}
	});
	}

	// Register resize handler
	$(window).on('resize', function() {
	clearTimeout(env.resize_timeout);
	env.resize_timeout = setTimeout(function() { resize(); }, 25);
	});

	// Enable rcmail.open_window intercepting
	env.open_window = rcmail.open_window;
	rcmail.open_window = window_open;

	rcmail
	.addEventListener('message', message_displayed)
	.addEventListener('menu-open', menu_toggle)
	.addEventListener('menu-close', menu_toggle)
	.addEventListener('editor-init', tinymce_init)
	.addEventListener('autocomplete_create', rcmail_popup_init)
	.addEventListener('googiespell_create', rcmail_popup_init)
	.addEventListener('enable-command', enable_command_handler)
	.addEventListener('init', init);
	};

	/**
	* rcmail 'init' event handler
	*/
	function init()
	{
	// Enable checkbox selection on list widgets
	$('table[data-list]').each(function() {
	var list = $(this).data('list');
	if (rcmail[list] && rcmail[list].multiselect) {
	rcmail[list].checkbox_selection = true;
	}
	});

	// https://github.com/roundcube/elastic/issues/45
	// Draggable blocks scrolling on touch devices, we'll disable it there
	if (is_touch()) {
	$('[data-list]', layout.list).each(function() {
	var list = $(this).data('list');
	if (rcmail[list] && typeof rcmail[list].draggable == 'function') {
	rcmail[list].draggable('destroy');
	}
	});
	}

	// Add menu link for each attachment
	$('#attachment-list > li').each(function() {
	attachmentmenu_append(this);
	});

	rcmail.addEventListener('fileappended', function(e) { if (e.attachment.complete) attachmentmenu_append(e.item); })
	.addEventListener('managesieve.insertrow', function(o) { bootstrap_style(o.obj); });

	rcmail.init_pagejumper('.pagenav > input');

	if (rcmail.task == 'mail') {
	// In compose window we do not provide "Back' button, instead
	// we modify the Mail button in the task menu to act like it (i.e. calls 'list' command)
	if (rcmail.env.action == 'compose' && !rcmail.env.extwin) {
	$('a.button.mail', layout.menu).attr('onclick', "return rcmail.command('list','',this,event)");
	}

	// Append contact menu to all mailto: links
	if (rcmail.env.action == 'preview' \|\| rcmail.env.action == 'show') {
	$('a').filter('[href^="mailto:"]').each(function() {
	mailtomenu_append(this);
	});
	}
	}

	rcmail.env.thread_padding = '1.5rem';

	// In devel mode we have to wait until all styles are aplied by less
	if (rcmail.env.devel_mode) {
	setTimeout(resize, 1000);
	}
	};

	/**
	* Apply bootstrap classes to html elements
	*/
	function bootstrap_style(context)
	{
	if (!context) {
	context = document;
	}

	$('input.button,button', context).addClass('btn').not('.btn-primary,.primary,.mainaction').addClass('btn-secondary');
	$('input.button.mainaction,button.primary,button.mainaction', context).addClass('btn-primary');
	$('button.btn.delete,button.btn.discard', context).addClass('btn-danger');

	$.each(['warning', 'error', 'information'], function() {
	var type = this;
	$('.box' + type, context).each(function() {
	message_displayed({object: this, type: type});
	});
	});

	// Convert structure of single dialogs (one input or just an image),
	// e.g. group create, attachment rename where we use <label>Label<input></label>
	if (context != document && $('.popup', context).children().length == 1) {
	var content = $('.popup', context).children().first();
	if (content.is('img')) {
	$('.popup', context).addClass('justified');
	}
	else if (content.is('label')) {
	var input = content.find('input').detach(),
	label = content.detach(),
	id = input.attr('id');

	if (!id) {
	input.attr('id', id = 'dialog-input-elastic');
	}

	$('.popup', context).addClass('formcontent').append(
	$('<div class="form-group row">')
	.append(label.attr('for', id).addClass('col-sm-2 col-form-label'))
	.append($('<div class="col-sm-10">').append(input))
	);

	input.focus();
	}
	}

	// Forms
	$('input:not(.button,[type=file],[type=radio],[type=checkbox]),select,textarea', $('.propform', context)).addClass('form-control');
	$('[type=checkbox]', $('.propform', context)).addClass('form-check-input');
	$('table.propform > tbody > tr', context).each(function() {
	var first, last, row = $(this),
	row_classes = ['form-group', 'row'],
	cells = row.children('td');

	if (cells.length == 2) {
	first = cells.first();
	last = cells.last();

	$('label', first).addClass('col-form-label');
	first.addClass('col-sm-4');
	last.addClass('col-sm-8');

	if (last.find('[type=checkbox]').length == 1 && !last.find('.proplist').length) {
	row_classes.push('form-check');

	if (last.find('a').length) {
	row_classes.push('with-link');
	}
	}
	else if (!last.find('input:not([type=hidden]),textarea,radio,select').length) {
	last.addClass('form-control-plaintext');
	}

	// style some multi-input fields
	if (last.children('.datepicker') && last.children('input').length == 2) {
	last.addClass('datetime');
	}
	}

	row.addClass(row_classes.join(' '));
	});

	// Special input + anything entry
	$('td.input-group', context).each(function() {
	$(this).children(':not(:first)').addClass('input-group-addon');
	});

	// Other forms, e.g. Contact advanced search
	$('fieldset.propform:not(.groupped) div.row', context).each(function() {
	var has_input = $('input,select,textarea', this).addClass('form-control').length > 0;

	$(this).children().last().addClass('col-sm-8' + (!has_input ? ' form-control-plaintext' : ''));
	$(this).children().first().addClass('col-sm-4 col-form-label');
	$(this).addClass('form-group');
	});

	// Contact info/edit form
	$('fieldset.propform.groupped fieldset', context).each(function() {
	$('.row', this).each(function() {
	var label, has_input = $('input,select,textarea', this).addClass('form-control').length > 0,
	items = $(this).children();

	if (items.length < 2) {
	return;
	}

	items.first().addClass('input-group-addon').not('select').addClass('col-form-label');

	if (!has_input) {
	items.last().addClass('form-control-plaintext');
	}

	$('.content', this).addClass('input-group-addon');
	$('a.deletebutton', this).addClass('input-group-addon icon delete');
	$(this).addClass('input-group');
	});
	});

	// Other forms, e.g. Insert response
	$('.propform > .prop.block:not(.row)', context).each(function() {
	$(this).addClass('form-group row').each(function() {
	$('label', this).addClass('col-form-label').wrap($('<div class="col-sm-4 col-form-label">'));
	$('input,select,textarea', this).addClass('form-control').wrap($('<div class="col-sm-8">'));
	});
	});

	$('td.rowbuttons > a', context).addClass('btn');

	// Testing Bootstrap Tabs on contact info/edit page
	// Tabs do not scale nicely on very small screen, so can be used
	// only with small number of tabs with short text labels
	$('form.tabbed,div.tabbed', context).each(function(idx, item) {
	var tabs = [], nav = $('<ul>').attr({'class': 'nav nav-tabs', role: 'tablist'});

	$(this).addClass('tab-content').children('fieldset').each(function(i, fieldset) {
	var tab, id = 'tab' + idx + '-' + i;

	$(fieldset).addClass('tab-pane').attr({id: id, role: 'tabpanel'});

	tab = $('<li>').addClass('nav-item').append(
	$('<a>').addClass('nav-link')
	.attr({role: 'tab', 'href': '#' + id})
	.text($('legend:first', fieldset).text())
	.click(function() {
	$(this).tab('show');
	// Returning false here prevents from strange scrolling issue
	// when the form is in an iframe, e.g. contact edit form
	return false;
	})
	);

	$('legend:first', fieldset).hide();
	tabs.push(tab);
	});

	// create the navigation bar
	nav.append(tabs).insertBefore(item);
	// activate the first tab
	$('a.nav-link:first', nav).click();
	});

	// Make tables pretier
	$('table:not(.propform):not(.listing)', context)
	.filter(function() {
	// exclude direct propform children and external content
	return !$(this).parent().is('.propform')
	&& !$(this).parents('.message-htmlpart,.message-partheaders').length;
	})
	.each(function() {
	// TODO: Consider implementing automatic setting of table-responsive on window resize
	$(this).addClass('table table-responsive-sm').find('thead').addClass('thead-default');
	});

	$('.toolbarmenu select', context).addClass('form-control');
	if (context != document) {
	$('select,textarea,input:not([type="checkbox"],[type="radio"])', context).addClass('form-control');
	}

	// The same for some other checkboxes
	// We do this here, not in setup() because we want to cover dialogs
	$('.propform input[type=checkbox], .form-check > input, .popupmenu.form input[type=checkbox], .toolbarmenu input[type=checkbox]', context)
	.each(function() { pretty_checkbox(this); });

	// Make message-objects alerts pretty (the same as UI alerts)
	$('#message-objects', context).children().each(function() {
	alert_style(this, $(this).addClass('boxwarning').attr('class').split(/\s/)[0]);
	$('a', this).addClass('btn btn-primary');
	});

	// Style calendar widget (we use setTimeout() because there's no widget event we could bind to)
	$('input.datepicker').focus(function() {
	setTimeout(function() { bootstrap_style($('.ui-datepicker')); }, 5);
	});

	// Form validation errors (managesieve plugin)
	$('.error').addClass('is-invalid');

	// Make logon form prettier
	if (rcmail.env.task == 'login' && context == document) {
	$('#login-form table tr').each(function() {
	var input = $('input,select', this),
	label = $('label', this),
	icon_name = input.data('icon'),
	icon = $('<i>').attr('class', 'input-group-addon icon ' + input.attr('name').replace('_', ''));

	if (icon_name) {
	icon.addClass(icon_name);
	}

	$(this).addClass('form-group row');
	label.parent().css('display', 'none');
	input.addClass('form-control')
	.attr('placeholder', label.text())
	.before(icon)
	.parent().addClass('input-group');
	});
	}
	};

	/**
	* Initializes popup menus
	*/
	function dropdowns_init()
	{
	$('[data-popup]').each(function() { popup_init(this); });

	// close popups on click in an iframe on the page
	var close_all_popups = function(e) {
	$('.popover-body:visible').each(function() {
	var button = $(this).children('*:first').data('button');
	if (e.target != button && typeof button !== 'string') {
	$(button).popover('hide');
	}
	});
	};

	$(document).on('click', popups_close);
	rcube_webmail.set_iframe_events({mousedown: popups_close});
	};

	/**
	* Init content frame
	*/
	function content_frame_init()
	{
	var last_selected = env.last_selected,
	title_reset = function() {
	var title = $('h1.voice').text() \|\| $('title').text() \|\| '';
	$('.header > .header-title', layout.content).text(title);
	};

	// when loading content-frame in small-screen mode display it
	layout.content.find('iframe').on('load', function(e) {
	var href = '', show = true;
	try {
	href = e.target.contentWindow.location.href;
	show = !href.endsWith(rcmail.env.blankpage);
	// Reset title back to the default
	$(e.target.contentWindow).on('unload', title_reset);
	}
	catch(e) { /* ignore */ }

	content_frame_navigation(href, e);

	if (show && !layout.content.is(':visible')) {
	env.last_selected = layout.content[0];
	screen_resize();
	}
	else if (!show) {
	if (env.last_selected != last_selected && !env.content_lock) {
	env.last_selected = last_selected;
	screen_resize();
	}
	title_reset();
	}

	env.content_lock = false;
	});

	// display the list widget after 'list' and 'listgroup' commands
	// @TODO: plugins should be able to do the same
	var list_handler = function(e) {
	if (mode != 'large' && !env.content_lock) {
	if (rcmail.env.task == 'addressbook' \|\| (rcmail.env.task == 'mail' && !rcmail.env.action)) {
	show_list();
	}
	}

	env.content_lock = false;

	// display current folder name in list header
	if (rcmail.env.task == 'mail' && !rcmail.env.action) {
	var name = $.type(e) == 'string' ? e : rcmail.env.mailbox,
	folder = rcmail.env.mailboxes[name];

	$('.header > .header-title', layout.list).text(folder ? folder.name : '');
	}
	};

	rcmail
	.addEventListener('afterlist', list_handler)
	.addEventListener('afterlistgroup', list_handler)
	.addEventListener('afterlistsearch', list_handler);
	};

	/**
	* Content frame navigation
	*/
	function content_frame_navigation(href, event)
	{
	// Don't display navigation for create/add action frames
	if (href.match(/_action=(create\|add)/) \|\| href.match(/_nav=hide/)) {
	$(env.frame_nav).addClass('hide-nav-buttons');
	return;
	}

	var uid, list, _list = $('[data-list]', layout.list).data('list');

	if (!_list \|\| !(list = rcmail[_list])) {
	// hide navbar if there are no visible buttons, e.g. Help plugin UI
	if ($(env.frame_nav).is('.hide-nav-buttons') && !$('.buttons', env.frame_nav).children().length) {
	$(env.frame_nav).addClass('hidden');
	}
	return;
	}

	$(env.frame_nav).removeClass('hide-nav-buttons hidden');

	// expand collapsed row so we do not skip the whole thread
	// TODO: Unified interface for list and treelist widgets
	if (uid = list.get_single_selection()) {
	if (list.rows && list.rows[uid] && !list.rows[uid].expanded) {
	list.expand_row(event, uid);
	}
	else if (list.get_node && list.get_node(uid).collapsed) {
	list.expand(uid);
	}
	}

	var prev, next,
	frame = $('#' + rcmail.env.contentframe),
	next_button = $('a.button.next', env.frame_nav).off('click').addClass('disabled'),
	prev_button = $('a.button.prev', env.frame_nav).off('click').addClass('disabled');

	if ((next = list.get_next()) \|\| rcmail.env.current_page < rcmail.env.pagecount) {
	next_button.removeClass('disabled').on('click', function() {
	env.content_lock = true;
	iframe_loader(frame);

	if (next) {
	list.select(next);
	}
	else {
	rcmail.env.list_uid = 'FIRST';
	rcmail.command('nextpage');
	}
	});
	}

	if (((prev = list.get_prev()) && (prev != '*' \|\| _list != 'subscription_list')) \|\| rcmail.env.current_page > 1) {
	prev_button.removeClass('disabled').on('click', function() {
	env.content_lock = true;
	iframe_loader(frame);

	if (prev) {
	list.select(prev);
	}
	else {
	rcmail.env.list_uid = 'LAST';
	rcmail.command('previouspage');
	}
	});
	}
	};

	/**
	* Handler for editor-init event
	*/
	function tinymce_init(o)
	{
	// Enable autoresize plugin
	o.config.plugins += ' autoresize';

	if (is_touch()) {
	// Make the toolbar icons bigger
	o.config.toolbar_items_size = null;

	// Use minimalistic toolbar
	o.config.toolbar = 'undo redo \| insert \| styleselect';

	if (o.config.plugins.match(/emoticons/)) {
	o.config.toolbar += ' emoticons';
	}
	}
	};

	/**
	* Handler for some Roundcube core popups
	*/
	function rcmail_popup_init(o)
	{
	// Add some common styling to the autocomplete/googiespell popups
	$('table,ul', o.obj).addClass('toolbarmenu listing iconized');
	$(o.obj).addClass('popupmenu popover');
	bootstrap_style(o.obj);

	// for googiespell list
	$('input', o.obj).addClass('form-control');

	// Modify the googiespell menu on mobile
	if (is_mobile() && $(o.obj).is('.googie_window')) {
	// Set popup Close title
	var title = rcmail.gettext('close'),
	class_name = 'button icon cancel',
	close_link = $('<a>').attr('class', class_name).text(title)
	.click(function(e) {
	e.stopPropagation();
	$('.popover-overlay').remove();
	$(o.obj).hide();
	});

	$('<h3 class="popover-header">').append(close_link).prependTo(o.obj);

	// add overlay element for phone layout
	if (!$('.popover-overlay').length) {
	$('<div>').attr('class', 'popover-overlay')
	.appendTo('body')
	.click(function() { $(this).remove(); });
	}

	$('table,button', o.obj).click(function(e) {
	if (!$(e.target).is('input')) {
	$('.popover-overlay').remove();
	}
	});
	}
	};

	function enable_command_handler(args)
	{
	if (is_framed) {
	$.each(frame_buttons, function(i, button) {
	if (args.command == button.command) {
	parent.$('#' + button.button_id)[args.status ? 'removeClass' : 'addClass']('disabled');
	}
	});
	}
	};

	/**
	* Window resize handler
	* Does layout reflows e.g. on screen orientation change
	*/
	function resize()
	{
	var size, mobile, width = $(window).width();

	if (width <= 480)
	size = 'phone';
	else if (width > 1200)
	size = 'large';
	else if (width > 768)
	size = 'normal';
	else
	size = 'small';

	touch = width <= 1024;
	mode = size;
	screen_resize();
	screen_resize_html();
	// display_screen_size(); // debug info

	// disable ext-windows and other features
	if (mobile = is_mobile()) {
	rcmail.set_env(env.small_screen_config);
	rcmail.enable_command('extwin', false);
	}
	else {
	rcmail.set_env(env.config);
	rcmail.enable_command('extwin', true);
	}

	// Hide content frame buttons on small devices (with frame toolbar in parent window)
	$.each(content_buttons, function() { $(this)[mobile ? 'hide' : 'show'](); });
	};

	// for development only (to be removed)
	function display_screen_size()
	{
	if (is_framed) {
	return;
	}

	var div = $('#screen-size'), win = $(window);
	if (!div.length) {
	div = $('<div>').attr({
	id: 'screen-size',
	style: 'position:absolute;display:block;right:0;z-index:100;'
	+ (is_framed ? 'top:0;' : 'bottom:0;')
	+ 'opacity:0.5;color:white;background-color:black;white-space:nowrap'
	}).appendTo(document.body);
	}

	div.text(win.width() + ' x ' + win.height() + ' (' + mode + ')');
	};

	function screen_resize()
	{
	if (!layout.sidebar.length && !layout.list.length) {
	return;
	}

	switch (mode) {
	case 'phone': screen_resize_phone(); break;
	case 'small': screen_resize_small(); break;
	case 'normal': screen_resize_normal(); break;
	case 'large': screen_resize_large(); break;
	}

	screen_resize_headers();
	};

	/**
	* Assigns layout-* and touch-mode class to the 'html' element
	*
	* If we're inside an iframe that is small we have to
	* check if the parent window is also small (mobile).
	* We use that e.g. to still display desktop-like popovers in dialogs
	*/
	function screen_resize_html()
	{
	var meta = layout_metadata(),
	html = $(document.documentElement);

	if (html[0].className.match(/layout-([a-z]+)/)) {
	if (RegExp.$1 != meta.mode) {
	html.removeClass('layout-' + RegExp.$1)
	.addClass('layout-' + meta.mode);
	}
	}
	else {
	html.addClass('layout-' + meta.mode);
	}

	if (meta.touch && !html.is('.touch')) {
	html.addClass('touch');
	}
	else if (!meta.touch && html.is('.touch')) {
	html.removeClass('touch');
	}
	};

	/**
	* Sets left and right margin to the header title element to make it
	* properly centered depending on the number of buttons on both sides
	*/
	function screen_resize_headers()
	{
	$('#layout > div > .header').each(function() {
	var title, right = 0, left = 0, padding = 0,
	sizes = {left: 0, right: 0};

	$(this).children(':visible').each(function() {
	if (!title && $(this).is('.header-title')) {
	title = $(this);
	return;
	}

	if ($(this).is('.searchbar')) {
	padding += this.offsetWidth;
	}
	else {
	sizes[title ? 'right' : 'left'] += this.offsetWidth;
	}
	});

	if (padding + sizes.right >= sizes.left) {
	right = 0;
	left = sizes.right + padding - sizes.left;
	}
	else {
	left = 0;
	right = sizes.left - (padding + sizes.right);
	}

	$(title).css({
	'margin-right': right + 'px',
	'margin-left': left + 'px',
	'padding-right': padding + 'px'
	});
	});
	};

	function screen_resize_phone()
	{
	screen_resize_small_all();

	layout.menu.addClass('hidden');
	};

	function screen_resize_small()
	{
	screen_resize_small_all();

	layout.menu.removeClass('hidden');
	};

	function screen_resize_normal()
	{
	var show;

	if (layout.list.length) {
	show = layout.list.is(env.last_selected) \|\| (!layout.sidebar.is(env.last_selected) && !layout.sidebar.is('.layout-sticky'));
	layout.list[show ? 'removeClass' : 'addClass']('hidden');
	}
	if (layout.sidebar.length) {
	show = !layout.list.length \|\| layout.sidebar.is(env.last_selected) \|\| layout.sidebar.is('.layout-sticky');
	layout.sidebar[show ? 'removeClass' : 'addClass']('hidden');
	}

	layout.content.removeClass('hidden');
	layout.menu.removeClass('hidden');

	screen_resize_small_none();
	};

	function screen_resize_large()
	{
	$.each(layout, function(name, item) { item.removeClass('hidden'); });

	screen_resize_small_none();
	};

	function screen_resize_small_all()
	{
	var show, got_content = false;

	if (layout.content.length) {
	show = got_content = layout.content.is(env.last_selected);
	layout.content[show ? 'removeClass' : 'addClass']('hidden');
	}

	if (layout.list.length) {
	show = !got_content && layout.list.is(env.last_selected);
	layout.list[show ? 'removeClass' : 'addClass']('hidden');
	}

	if (layout.sidebar.length) {
	show = !got_content && (layout.sidebar.is(env.last_selected) \|\| !layout.list.length);
	layout.sidebar[show ? 'removeClass' : 'addClass']('hidden');
	}

	if (got_content) {
	buttons.back_list.show();
	}

	$('.header > ul.toolbar', layout.content).addClass('popupmenu');
	};

	function screen_resize_small_none()
	{
	buttons.back_list.hide();
	$('ul.toolbar.popupmenu').removeClass('popupmenu');
	};

	function show_content(unsticky)
	{
	// show sidebar and hide list
	layout.list.addClass('hidden');
	layout.sidebar.addClass('hidden');
	layout.content.removeClass('hidden');

	if (unsticky) {
	layout.sidebar.removeClass('layout-sticky');
	}

	screen_resize_headers();
	env.last_selected = layout.content[0];
	};

	function show_sidebar(sticky)
	{
	// show sidebar and hide list
	layout.list.addClass('hidden');
	layout.sidebar.removeClass('hidden');

	if (sticky) {
	layout.sidebar.addClass('layout-sticky');
	}

	if (mode == 'small' \|\| mode == 'phone') {
	layout.content.addClass('hidden');
	}

	screen_resize_headers();
	};

	function show_list(scroll)
	{
	if (!layout.list.length && !layout.sidebar.length) {
	history.back();
	}
	else {
	// show list and hide sidebar and content
	layout.sidebar.addClass('hidden').removeClass('layout-sticky');
	layout.list.removeClass('hidden');

	if (mode == 'small' \|\| mode == 'phone') {
	hide_content();
	}

	if (scroll) {
	layout.list.children('.scroller').scrollTop(0);
	}
	}

	screen_resize_headers();
	};

	function hide_content()
	{
	// show sidebar or list, hide content frame
	env.last_selected = layout.list[0] \|\| layout.sidebar[0];
	screen_resize();

	// reset content frame, so we can load it again
	rcmail.show_contentframe(false);

	// now we have to unselect selected row on the list
	$('[data-list]', layout.list).each(function() {
	var list = $(this).data('list');
	if (rcmail[list]) {
	if (rcmail[list].clear_selection) {
	rcmail[list].clear_selection(); // list widget
	}
	else if (rcmail[list].select) {
	rcmail[list].select(); // treelist widget
	}
	}
	});
	};

	// show menu widget
	function show_menu()
	{
	var show = true;

	if (mode == 'phone') {
	show = layout.menu.is(':visible') ? false : true;
	}

	layout.menu[show ? 'removeClass' : 'addClass']('hidden');
	};

	/**
	* Triggered when a UI message is displayed
	*/
	function message_displayed(p)
	{
	if (p.type == 'loading' && $('.iframe-loader:visible').length) {
	// hide original message object, we don't need two "loaders"
	rcmail.hide_message(p.object);
	return;
	}

	alert_style(p.object, p.type, true);
	$(p.object).attr('role', 'alert');
	/*
	$('a', p.object).addClass('alert-link');

	// show a popup dialog on errors
	if (p.type == 'error' && rcmail.env.task != 'login') {
	// hide original message object, we don't want both
	rcmail.hide_message(p.object);
	}
	*/
	};

	/**
	* Applies some styling and icon to an alert object
	*/
	function alert_style(object, type, wrap)
	{
	var tmp, classes = 'ui alert',
	map = {
	information: 'alert-info',
	confirmation: 'alert-success',
	notice: 'alert-warning',
	warning: 'alert-warning',
	error: 'alert-danger',
	loading: 'alert-info loading',
	vcardattachment: 'alert-info' /* vcard_attachments plugin */
	};

	if (wrap) {
	// we need the content to be non-text node for best alignment
	tmp = $(object).html();
	$(object).html($('<span>').html(tmp));
	}

	if (tmp = map[type]) {
	classes += ' ' + tmp;
	$('<i>').attr('class', 'icon').prependTo(object);
	}

	$(object).addClass(classes);
	};

	/**
	* Set UI dialogs size/style depending on screen size
	*/
	function dialog_open(dialog)
	{
	var me = $(dialog.uiDialog),
	width = me.width(),
	height = me.height(),
	maxWidth = $(window).width(),
	maxHeight = $(window).height();

	if (maxWidth <= 480) {
	me.css({width: '100%', height: '100%'});
	}
	else {
	if (height > maxHeight) {
	me.css('height', '100%');
	}
	if (width > maxWidth) {
	me.css('width', '100%');
	}
	}

	// Display loader when the dialog has an iframe
	iframe_loader($('div.popup > iframe', me));

	// TODO: style buttons/forms
	bootstrap_style(dialog.uiDialog);
	};

	/**
	* Initializes searchbar widget
	*/
	function searchbar_init(bar)
	{
	var input = $('input', bar).addClass('form-control'),
	button = $('a.button.search', bar),
	form = $('form', bar),
	is_search_pending = function() {
	// TODO: This have to be improved to detect real searching state
	// There are cases when search is active but the input is empty
	return input.val();
	},
	hide_func = function(event, focus) {
	if (button.is(':visible')) {
	return;
	}
	form.hide();
	// width:auto fixes search button position in Chrome
	$(bar).css('left', 'auto')[is_search_pending() ? 'addClass' : 'removeClass']('active');
	button.css('display', 'block');
	if (focus && rcube_event.is_keyboard(event)) {
	button.focus();
	}
	};

	$(bar).parent().addClass('with-search');

	if (is_search_pending()) {
	$(bar).addClass('active');
	}

	// make the input pretty
	form.addClass('input-group')
	.prepend($('<i class="input-group-addon icon search">'))
	.append($('a.options').detach().removeClass('button').addClass('icon input-group-addon'))
	.append($('a.reset').detach().removeClass('button').addClass('icon input-group-addon'))
	.append($('<a class="icon cancel input-group-addon" href="#">'));

	// Display search form
	button.on('click', function() {
	$(bar).css('left', 0);
	form.css('display', 'flex');
	button.hide();
	input.focus();
	});

	// Search reset action
	$('a.reset', bar).on('click', function(e) {
	// for treelist widget's search setting val and keyup.treelist is needed
	// in normal search form reset-search command will do the trick
	// TODO: This calls for some generalization, what about two searchboxes on a page?
	input.val('').change().trigger('keyup.treelist', {keyCode: 27});

	// we have to de-activate filter
	// TODO: Probably that should not reset filter, but that's current Roundcube bahavior
	$(bar).prev('.searchfilterbar').removeClass('active');

	hide_func(e, true);
	});

	$('a.cancel', bar).attr('title', rcmail.gettext('close')).on('click', function(e) { hide_func(e, true); });

	// These will hide the form, but not reset it
	rcube_webmail.set_iframe_events({mousedown: hide_func});
	$('body').on('mousedown', function(e) {
	// close searchbar on mousedown anywhere, but not inside the searchbar or dialogs
	if (!$(e.target).parents('.popover,.searchbar').length) {
	hide_func(e);
	}
	});

	rcmail.addEventListener('init', function() { if (input.val()) $(bar).addClass('active'); });
	};

	/**
	* Initializes searchfilterbar widget
	*/
	function searchfilterbar_init(bar)
	{
	bar = $('<div class="searchfilterbar searchbar toolbar">')
	.insertAfter(bar)
	.append($(bar).detach())
	.append($('<a class="button icon filter">').attr('title', rcmail.gettext('filter')));

	$('select', bar).wrap($('<div class="input-group">'))
	.parent().prepend($('<i class="input-group-addon icon filter">'))
	.append($('<a class="icon cancel input-group-addon">')
	.attr({title: rcmail.gettext('close'), href: '#'}));

	var select = $('select', bar),
	button = $('a.button.filter', bar),
	form = $('.input-group', bar),
	is_filter_enabled = function() {
	var value = select.val();
	return value && value != 'ALL';
	},
	hide_func = function(event, focus) {
	if (button.is(':visible')) {
	return;
	}
	form.hide();
	bar.css('left', 'auto')[is_filter_enabled() ? 'addClass' : 'removeClass']('active');
	button.css('display', 'block');
	if (focus && rcube_event.is_keyboard(event)) {
	button.focus();
	}
	};

	bar.parent().addClass('with-filter');

	if (is_filter_enabled()) {
	bar.addClass('active');
	}

	select.removeClass('hidden searchfilterbar').addClass('form-control')
	.on('change', function(e) {
	hide_func(e, true);
	// It may be called when the form is hidden... update status
	if (is_filter_enabled()) {
	bar.removeClass('active');
	}
	});

	// Display filter selection (with animation effect)
	button.on('click', function() {
	$(bar).css('left', 0);
	form.css('display', 'flex');
	button.hide();
	select.focus();
	});

	// Filter close button
	$('a.cancel', bar).on('click', function(e) { hide_func(e, true); });

	// These will hide the form, but not reset it
	rcube_webmail.set_iframe_events({mousedown: hide_func});
	$('body').on('mousedown', function(e) {
	// close searchbar on mousedown anywhere, but not inside the searchbar or dialogs
	if (!$(e.target).parents('.searchfilterbar').length) {
	hide_func(e);
	}
	});
	};

	/**
	* Converts toolbar menu into popup-menu for small screens
	*/
	function toolbar_init()
	{
	if (env.got_smart_toolbar) {
	return;
	}

	env.got_smart_toolbar = true;

	// TODO: a way to inject buttons to the menu from content iframe
	// or automatically add all buttons except Save and Cancel
	// (example QR Code button in contact frame)

	var items = [];

	// convert toolbar to a popup list
	$('.header > .toolbar', layout.content).each(function() {
	var toolbar = $(this);

	toolbar.children().each(function() {
	var item = $('<li role="menuitem">'),
	button = $(this).detach();

	// Remove empty text nodes that break alignment of text of the menu item
	button.contents().filter(function() { if (this.nodeType == 3 && !$.trim(this.nodeValue).length) $(this).remove(); });

	if (button.is('.spacer')) {
	item.addClass('spacer');
	}
	else {
	item.append(button);
	}

	items.push(item);
	});

	toolbar.remove();
	});

	// special elements to clone and add to the toolbar (mobile only)
	$('ul[data-menu="toolbar-small"] > li > a').each(function() {
	var button = $(this).clone();

	button.attr('id', this.id + '_clone');

	// TODO: rcmail.register_button()

	items.push($('<li role="menuitem">').addClass('hidden-big').append(button));
	});

	// append the new toolbar and menu button
	if (items.length) {
	var container = layout.content.children('.header'),
	menu_attrs = {'class': 'toolbar popupmenu listing iconized', id: 'toolbar-menu'},
	menu_button = $('<a class="button icon toolbar-menu-button" href="#menu">')
	.attr({'data-popup': 'toolbar-menu'});

	container
	// TODO: copy original toolbar attributes (class, role, aria-*)
	.append($('<ul>').attr(menu_attrs).data('popup-parent', container).append(items))
	.append(menu_button);

	if (layout.list.length) {
	// bind toolbar menu with the menu button in the list header
	$('a.toolbar-menu-button', layout.list).click(function(e) {
	e.stopPropagation();
	menu_button.click();
	});
	}
	}
	};

	/**
	* Initialize a popup for specified button element
	*/
	function popup_init(item, win)
	{
	// On mobile we display the menu from the frame in the parent window
	if (is_framed && is_mobile()) {
	return parent.UI.popup_init(item, win \|\| window);
	}

	if (!win) win = window;

	var level,
	popup_id = $(item).data('popup'),
	popup = $(win.$('#' + popup_id).get(0)), // a "hack" to support elements in frames
	popup_orig = popup,
	title = $(item).attr('title'),
	content_element = function() {
	// On mobile we display a menu from the frame in the parent window
	// To make menu actions working we have to clone the menu
	// and pass click events to it...
	if (win != window) {
	popup = popup_orig.clone(true, true);
	popup.attr('id', popup_id + '-clone')
	.appendTo(document.body)
	.find('li > a, li.checkbox > label').attr('onclick', '').off('click').on('click', function(e) {
	if (!$(this).is('.disabled')) {
	$(item).popover('hide');
	win.$('#' + $(this).attr('id')).click();
	}

	return false;
	});
	}

	return popup.get(0);
	};

	$(item).attr({
	'aria-haspopup': 'true',
	'aria-expanded': 'false',
	'aria-owns': popup_id,
	})
	.popover({
	content: content_element,
	trigger: $(item).data('popup-trigger') \|\| 'click',
	placement: $(item).data('popup-pos') \|\| 'bottom',
	animation: true,
	html: true
	})
	.on('show.bs.popover', function(event) {
	var init_func = popup.data('popup-init');

	if (popup_id && menus[popup_id]) {
	menus[popup_id].transitioning = true;
	}

	if (init_func && ref[init_func]) {
	ref[init_func](popup.get(0), item, event);
	}
	else if (init_func && win[init_func]) {
	win[init_func](popup.get(0), item, event);
	}

	level = $('div.popover:visible').length + 1;

	popup.removeClass('hidden').attr('aria-hidden', false)
	// Stop propagation on menu items that have popups
	// to make a click on them not hide their parent menu(s)
	.find('[aria-haspopup="true"]')
	.data('level', level + 1)
	.off('click.popup')
	.on('click.popup', function(e) { e.stopPropagation(); });

	if (!is_mobile()) {
	// Set popup height so it is less than the window height
	popup.css('max-height', Math.min(510, $(window).height() - 30));
	}
	})
	.on('shown.bs.popover', function(event) {
	var mobile = is_mobile();

	level = $(item).data('level') \|\| 1;

	// Set popup Back/Close title
	if (mobile) {
	var label = level > 1 ? 'back' : 'close',
	title = rcmail.gettext(label),
	class_name = 'button icon ' + (label == 'back' ? 'back' : 'cancel');

	$('#' + $(item).attr('aria-describedby') + ' > .popover-header').empty()
	.append($('<a>').attr('class', class_name).text(title))
	.off('click').on('click', function(e) {
	$(item).popover('hide');
	if (level > 1) {
	e.stopPropagation();
	}
	});
	}

	// Hide other menus on the same level
	$.each(menus, function(id, prop) {
	if ($(prop.target).data('level') == level && id != popup_id) {
	menu_hide(id);
	}
	});

	if (popup_id && menus[popup_id]) {
	menus[popup_id].transitioning = false;
	}

	// add overlay element for phone layout
	if (mobile && !$('.popover-overlay').length) {
	$('<div>').attr('class', 'popover-overlay')
	.appendTo('body')
	.click(function() { $(this).remove(); });
	}
	})
	.on('hide.bs.popover', function() {
	if (level == 1) {
	$('.popover-overlay').remove();
	}

	if (popup_id && menus[popup_id] && popup.is(':visible')) {
	menus[popup_id].transitioning = true;
	}
	})
	.on('hidden.bs.popover', function() {
	if (/-clone$/.test(popup.attr('id'))) {
	popup.remove();
	}
	else {
	popup.attr('aria-hidden', true)
	// Some menus aren't being hidden, force that
	.addClass('hidden')
	// Bootstrap will detach the popup element from
	// the DOM (https://github.com/twbs/bootstrap/issues/20219)
	// making our menus to not update buttons state.
	// Work around this by attaching it back to the DOM tree.
	popup.appendTo(popup.data('popup-parent') \|\| document.body);
	}

	// close orphaned popovers, for some reason there are sometimes such dummy elements left
	$('.popover-body:empty').each(function() { $(this).parent().remove(); });

	if (popup_id && menus[popup_id]) {
	delete menus[popup_id];
	}
	})
	.on('keypress', function(event) {
	// Close the popup on ESC key
	if (event.originalEvent.keyCode == 27) {
	$(item).popover('hide');
	}
	});

	// re-add title attribute removed by bootstrap popover
	if (title) {
	$(item).attr('title', title);
	}

	popup.attr('aria-hidden', 'true').data('button', item);

	// stop propagation to e.g. do not hide the popup when
	// clicking inside on form elements
	if (popup.data('editable')) {
	popup.on('click mousedown', function(e) { e.stopPropagation(); });
	}
	};

	/**
	* Closes all popups (for use as event handler)
	*/
	function popups_close(e)
	{
	$('.popover.show').each(function() {
	var popup = $('.popover-body', this),
	button = popup.children().first().data('button');

	if (button && e.target != button && !$(button).find(e.target).length && typeof button !== 'string') {
	$(button).popover('hide');
	}

	if (!button) {
	$(this).remove();
	}
	});
	};

	/**
	* Handler for menu-open and menu-close events
	*/
	function menu_toggle(p)
	{
	if (!p \|\| !p.name \|\| (p.props && p.props.skinable === false)) {
	return;
	}

	if (is_framed && is_mobile()) {
	if (!p.win) {
	p.win = window;
	}
	return parent.UI.menu_toggle(p);
	}

	if (p.name == 'messagelistmenu') {
	menu_messagelist(p);
	}
	else if (p.event == 'menu-open') {
	var fn, pos,
	content = $('ul:first', p.obj),
	target = p.originalEvent.target;

	if ($(target).is('span')) {
	target = $(target).parents('a,li')[0];
	}

	if (p.name.match(/^drag/)) {
	// create a fake element to position drag menu on the cursor position
	pos = rcube_event.get_mouse_pos(p.originalEvent);
	target = $('<a>').css({
	position: 'absolute',
	left: pos.x,
	top: pos.y,
	height: '1px',
	width: '1px',
	visibility: 'hidden'
	})
	.appendTo(document.body).get(0);
	}

	pos = $(target).data('popup-pos') \|\| 'right';

	if (p.name == 'folder-selector') {
	content.addClass('listing folderlist');
	}
	else if (content.hasClass('toolbarmenu')) {
	content.addClass('listing');
	}

	if (p.name == 'pagejump-selector') {
	content.addClass('simplelist');
	p.obj.addClass('simplelist');
	pos = 'top';
	}

	// There can be only one menu of the same type
	if (menus[p.name]) {
	menu_hide(p.name, p.originalEvent);
	}

	// Popover menus use animation. Sometimes the same menu is
	// immediately hidden and shown (e.g. folder-selector for copy and move action)
	// we have to wait until the previous menu hides before we can open it again
	fn = function() {
	if (menus[p.name] && menus[p.name].transitioning) {
	return setTimeout(fn, 50);
	}

	if (!$(target).data('popup')) {
	$(target).data({
	popup: p.name,
	'popup-pos': pos,
	'popup-trigger': 'manual'
	});
	popup_init(target, p.win);
	}

	menus[p.name] = {target: target};
	$(target).popover('show');
	}

	fn();
	}
	else {
	menu_hide(p.name, p.originalEvent);
	}

	// Stop propagation so multi-level menus work properly
	p.originalEvent.stopPropagation();
	};

	/**
	* Close menu by name
	*/
	function menu_hide(name, event)
	{
	var target;

	if (menus[name]) {
	target = menus[name].target;
	}
	else {
	target = $('#' + name).data('button');

	// catch cases as 'forwardmenu' where menu suffix has no hyphen
	if (!target && name.match(/(?!-)menu$/)) {
	target = $('#' + name.substr(0, name.length - 4) + '-menu').data('button');
	}
	}

	if (name.match(/^drag/)) {
	$(target).popover('dispose').remove();
	}
	else {
	$(target).popover('hide');

	// In phone mode close all menus when forwardmenu is requested to be closed
	// FIXME: This is a hack, we need some generic solution.
	if (name == 'forwardmenu') {
	popups_close(event);
	}
	}
	};

	/**
	* Messages list options dialog
	*/
	function menu_messagelist(p)
	{
	var content = $('#listoptions-menu'),
	width = content.width() + 25,
	dialog = content.clone();

	// set form values
	$('select[name="sort_col"]', dialog).val(rcmail.env.sort_col \|\| '');
	$('select[name="sort_ord"]', dialog).val(rcmail.env.sort_order \|\| 'ASC');
	$('select[name="mode"]', dialog).val(rcmail.env.threading ? 'threads' : 'list');

	// Fix id/for attributes
	$('select', dialog).each(function() { this.id = this.id + '-clone'; });
	$('label', dialog).each(function() { $(this).attr('for', $(this).attr('for') + '-clone'); });

	var save_func = function(e) {
	if (rcube_event.is_keyboard(e.originalEvent)) {
	$('#listmenulink').focus();
	}

	var col = $('select[name="sort_col"]', dialog).val(),
	ord = $('select[name="sort_ord"]', dialog).val(),
	mode = $('select[name="mode"]', dialog).val();

	rcmail.set_list_options([], col, ord, mode == 'threads' ? 1 : 0);
	return true;
	};

	dialog = rcmail.simple_dialog(dialog, rcmail.gettext('listoptionstitle'), save_func, {
	closeOnEscape: true,
	open: function(e) {
	setTimeout(function() { dialog.find('select').first().focus(); }, 100);
	},
	minWidth: 400,
	width: width
	});
	};

	/**
	* About dialog
	*/
	function about_dialog(elem)
	{
	var support_url, support_func, support_button = false,
	dialog = $('<iframe>').attr({id: 'aboutframe', src: rcmail.url('settings/about', {_framed: 1})}),
	support_link = $('#supportlink');

	// TODO: 'Get Support' link/button
	if (support_link.length && (support_url = support_link.attr('href'))) {
	support_button = support_link.html();
	support_func = function(e) { support_url.indexOf('mailto:') < 0 ? window.open(support_url) : location.href = support_url };
	}

	rcmail.simple_dialog(dialog, $(elem).text(), support_func, {
	button: support_button,
	cancel_button: 'close',
	width: 600,
	height: 400
	});
	};

	/**
	* Show/hide more mail headers (envelope)
	*/
	function headers_show(button)
	{
	var headers = $(button).parent().prev();
	headers[headers.is('.hidden') ? 'removeClass' : 'addClass']('hidden');
	};

	/**
	* Mail headers dialog
	*/
	function headers_dialog()
	{
	var props = {_uid: rcmail.env.uid, _mbox: rcmail.env.mailbox},
	dialog = $('<iframe>').attr({id: 'headersframe', src: rcmail.url('headers', props)});

	rcmail.simple_dialog(dialog, rcmail.gettext('arialabelmessageheaders'), null, {
	cancel_button: 'close',
	width: 600,
	height: 400
	});
	};

	/**
	* Search options menu popup
	*/
	function searchmenu(obj)
	{
	var n, all,
	list = $('input[name="s_mods[]"]', obj),
	scope_list = $('input[name="s_scope"]', obj),
	mbox = rcmail.env.mailbox,
	mods = rcmail.env.search_mods,
	scope = rcmail.env.search_scope \|\| 'base';

	if (!$(obj).data('initialized')) {
	list.on('click', function() { set_searchmod(this, obj); });
	scope_list.on('click', function() { rcmail.set_searchscope(this.value); });
	$(obj).data('initialized', true);
	}

	if (rcmail.env.search_mods) {
	if (rcmail.env.task == 'mail') {
	if (scope == 'all') {
	mbox = '*';
	}

	mods = mods[mbox] ? mods[mbox] : mods['*'];
	all = 'text';
	scope_list.prop('checked', false).filter('#s_scope_' + scope).prop('checked', true);
	}
	else {
	all = '*';
	}

	if (mods[all]) {
	list.map(function() {
	this.checked = true;
	this.disabled = this.value != all;
	});
	}
	else {
	list.prop('disabled', false).prop('checked', false);
	for (n in mods) {
	$('#s_mod_' + n, obj).prop('checked', true);
	}
	}
	}
	};

	function set_searchmod(elem, menu)
	{
	var all, m, task = rcmail.env.task,
	mods = rcmail.env.search_mods,
	mbox = rcmail.env.mailbox,
	scope = $('input[name="s_scope"]:checked', menu).val();

	if (scope == 'all') {
	mbox = '*';
	}

	if (!mods) {
	mods = {};
	}

	if (task == 'mail') {
	if (!mods[mbox]) {
	mods[mbox] = rcube_clone_object(mods['*']);
	}
	m = mods[mbox];
	all = 'text';
	}
	else { //addressbook
	m = mods;
	all = '*';
	}

	if (!elem.checked) {
	delete(m[elem.value]);
	}
	else {
	m[elem.value] = 1;
	}

	// mark all fields
	if (elem.value == all) {
	$('input[name="s_mods[]"]', menu).map(function() {
	if (this == elem) {
	return;
	}

	this.checked = true;

	if (elem.checked) {
	this.disabled = true;
	delete m[this.value];
	}
	else {
	this.disabled = false;
	m[this.value] = 1;
	}
	});
	}

	rcmail.set_searchmods(m);
	};

	/**
	* Spellcheck languages list
	*/
	function spellmenu(obj)
	{
	var i, link, li, list = [],
	lang = rcmail.spellcheck_lang(),
	ul = $('ul', obj);

	if (!ul.length) {
	ul = $('<ul class="toolbarmenu selectable listing iconized" role="menu">');

	for (i in rcmail.env.spell_langs) {
	li = $('<li role="menuitem">');
	link = $('<a href="#'+ i +'" tabindex="0"></a>')
	.text(rcmail.env.spell_langs[i])
	.addClass('active').data('lang', i)
	.on('click keypress', function(e) {
	if (e.type != 'keypress' \|\| rcube_event.get_keycode(e) == 13) {
	rcmail.spellcheck_lang_set($(this).data('lang'));
	rcmail.hide_menu('spell-menu', e);
	return false;
	}
	});

	link.appendTo(li);
	list.push(li);
	}

	ul.append(list).appendTo(obj);
	}

	// select current language
	$('li', ul).each(function() {
	var el = $('a', this);
	if (el.data('lang') == lang) {
	el.addClass('selected').attr('aria-selected', 'true');
	}
	else if (el.hasClass('selected')) {
	el.removeClass('selected').removeAttr('aria-selected');
	}
	});
	};

	/**
	* Attachment menu
	*/
	function attachmentmenu(obj, button, event)
	{
	var id = $(button).parent().attr('id').replace(/^attach/, '');

	$.each(['open', 'download', 'rename'], function() {
	var action = this;
	$('#attachmenu' + action, obj).off('click').attr('onclick', '').click(function(e) {
	rcmail.command(action + '-attachment', id, this, e.originalEvent);
	});
	});

	// call menu-open so core can set state of menu commands
	rcmail.command('menu-open', {menu: 'attachmentmenu', id: id}, obj, event);
	};

	/**
	* Appends drop-icon to attachments list item (to invoke attachment menu)
	*/
	function attachmentmenu_append(item)
	{
	item = $(item);

	if (!item.children('.drop').length) {
	var label = rcmail.gettext('options');
	var button = $('<a>')
	.attr({
	href: '#',
	tabindex: 0,
	title: label,
	'class': 'button icon dropdown skip-content'
	})
	.on('click', function(e) {
	attachmentmenu($('#attachmentmenu'), button, e);
	})
	.append($('<span>').attr('class', 'inner').text(label))
	.appendTo(item);
	}
	};

	/**
	* Mailto menu
	*/
	function mailtomenu(obj, button, event)
	{
	var mailto = $(button).attr('href').replace(/^mailto:/, '');

	if (mailto.indexOf('@') < 0) {
	return true; // let the browser handle this
	}

	if (rcmail.env.has_writeable_addressbook) {
	$('.addressbook', obj).addClass('active')
	.off('click').on('click', function(e) {
	var i, contact = mailto,
	txt = $(button).filter('.rcmContactAddress').text();

	contact = contact.split('?')[0].split(',')[0].replace(/(^<\|>$)/g, '');

	if (txt) {
	txt = txt.replace('<' + contact + '>', '');
	contact = '"' + $.trim(txt) + '" <' + contact + '>';
	}

	rcmail.command('add-contact', contact, this, e.originalEvent);
	});
	}

	$('.compose', obj).off('click').on('click', function(e) {
	rcmail.command('compose', mailto, this, e.originalEvent);
	});

	return rcmail.command('menu-open', {menu: 'mailto-menu', link: button}, button, event);
	};

	/**
	* Appends popup menu to mailto links
	*/
	function mailtomenu_append(item)
	{
	$(item).attr('onclick', '').on('click', function(e) {
	return mailtomenu($('#mailto-menu'), item, e);
	});
	};

	/**
	* Headers menu in mail compose
	*/
	function headersmenu(obj, button, event)
	{
	$('li > a', obj).each(function() {
	var target = '#compose_' + $(this).data('target');

	$(this)[$(target).is(':visible') ? 'removeClass' : 'addClass']('active')
	.off().on('click', function() {
	$(target).removeClass('hidden').find('.recipient-input > input').focus();
	});
	});
	};

	/**
	* Replaces recipient input with content-editable element that uses "recipient boxes"
	*/
	function recipient_input(obj)
	{
	var area, input, ac_props,
	apply_func = function() {
	// update the original input
	$(obj).val(area.text());
	},
	focus_func = function() {
	area.addClass('focus');
	},
	insert_recipient = function(name, email) {
	var recipient = $('<span class="recipient">'),
	name_element = $('<span class="name">').html(recipient_input_name(name \|\| email)),
	email_element = $('<span class="email">'),
	// TODO: should the 'close' link have tabindex?
	link = $('<a>').attr({'class': 'button icon remove'})
	.click(function() {
	recipient.remove();
	apply_func();
	input.focus();
	return false;
	});

	if (name) {
	email = ' <' + email + '>';
	}

	email_element.text((name ? email : '') + ',');
	recipient.attr('title', name ? (name + email) : null)
	.append([name_element, email_element, link])
	.insertBefore(input);
	},
	update_func = function() {
	var text = input.val().replace(/[,;\s]+$/, ''),
	recipients = recipient_input_parser(text);

	$.each(recipients, function() {
	insert_recipient(this.name, this.email);
	});

	if (recipients.length) {
	input.val('');
	apply_func();
	return true;
	}
	},
	parse_func = function(e) {
	// Note it can be also executed when autocomplete inserts a recipient
	update_func();

	if (e.type == 'blur') {
	area.removeClass('focus');
	}
	},
	keydown_func = function(e) {
	// On Backspace remove the last recipient
	if (e.keyCode == 8 && !input.val().length) {
	area.children('span.recipient:last').remove();
	apply_func();
	return false;
	}
	// Here we add a recipient box when the separator character (,;) was pressed
	else if (e.key == ',' \|\| e.key == ';') {
	if (update_func()) {
	return false;
	}
	}
	};

	// Create the content-editable div
	input = $('<input>').attr({type: 'text', tabindex: $(obj).attr('tabindex')})
	.on('paste change blur', parse_func)
	.on('keydown', keydown_func)
	.on('focus mousedown', focus_func);

	area = $('<div>').addClass('form-control recipient-input')
	.append(input)
	.on('click', function() { input.focus(); });

	// "Replace" the original input/textarea with the content-editable div
	// Note: we do not remove the original element, and we do not use
	// display: none, because we want to handle onfocus event
	// Note: tabindex:-1 to make Shift+TAB working on these widgets
	$(obj).css({position: 'absolute', opacity: 0, left: '-5000px', width: '10px'})
	.attr('tabindex', -1)
	.after(area)
	// some core code sometimes focuses or changes the original node
	// in such cases we wan't to parse it's value and apply changes
	// to the widget element
	.on('focus', function(e) { input.focus(); })
	.on('change', function(e) {
	$('span.recipient', area).remove();
	input.val(this.value).change();
	})
	// copy and parse the value already set
	.change();

	// this one line is here to fix border of Bootstrap's input-group,
	// input-group should not contain any hidden elements
	$(obj).detach().insertBefore(area.parent());

	if (rcmail.env.autocomplete_threads > 0) {
	ac_props = {
	threads: rcmail.env.autocomplete_threads,
	sources: rcmail.env.autocomplete_sources
	};
	}

	// Init autocompletion
	rcmail.init_address_input_events(input, ac_props);
	};

	/**
	* Parses recipient address input and extracts recipients from it
	*/
	function recipient_input_parser(text)
	{
	var recipients = [],
	address_rx_part = '(\\S+\|("[^"]+"))@\\S+',
	recipient_rx1 = new RegExp('(<' + address_rx_part + '>)'),
	recipient_rx2 = new RegExp('(' + address_rx_part + ')'),
	global_rx = /(?=\S)[^",;](?:"[^\\"](?:\\[,;\S][^\\"])"[^",;])/g,
	matches = text.match(global_rx);

	$.each(matches \|\| [], function() {
	if (this.length && (recipient_rx1.test(this) \|\| recipient_rx2.test(this))) {
	var email = RegExp.$1,
	name = $.trim(this.replace(email, ''));

	recipients.push({
	name: name,
	email: email.replace(/(^<\|>$)/g, ''),
	text: this
	});
	}
	});

	return recipients;
	};

	/**
	* Generates HTML for a text adding <span class="hidden">
	* for quote/backslash characters, so they are hidden from the user,
	* but still in place to make copying simpler
	*
	* Note: Selection works in Chrome, but not in Firefox?
	*/
	function recipient_input_name(text)
	{
	var i, char, result = '', len = text.length;

	if (text.charAt(0) != '"' && text.indexOf('"') > -1) {
	text = '"' + text.replace('\\', '\\\\').replace('"', '\\"') + '"';
	}

	for (i=0; i<len; i++) {
	char = text.charAt(i);
	switch (char) {
	case '"':
	if (i > 0 && i < len - 1) {
	result += '"';
	break;
	}

	result += '<span class="quotes">' + char + '</span>';
	break;

	case '\\':
	result += '<span class="quotes">' + char + '</span>';

	if (text.charAt(i+1) == '\\') {
	result += char;
	i++;
	}
	break;

	case '<':
	result += '<';
	break;

	case '>':
	result += '>';
	break;

	default:
	result += char;
	}
	}

	return result;
	};

	/**
	* Adds logic to the contact photo widget
	*/
	function image_upload_input(obj)
	{
	var reset_button = $('<a>')
	.attr({'class': 'icon button delete', href: '#', })
	.click(function(e) { rcmail.command('delete-photo', '', this, e); return false; });

	$(obj).append(reset_button).click(function() { rcmail.upload_input('upload-form'); });

	$('img', obj).on('load', function() {
	// FIXME: will that work in IE?
	var state = (this.currentSrc \|\| this.src).indexOf(rcmail.env.photo_placeholder) != -1;
	$(obj)[state ? 'removeClass' : 'addClass']('changed');
	});
	};

	/**
	* Displays loading... overlay for iframes
	*/
	function iframe_loader(frame)
	{
	frame = $(frame);

	if (frame.length) {
	var loader = $('<div>').attr('class', 'iframe-loader')
	.append($('<div>').attr('class', 'spinner').text(rcmail.gettext('loading')));

	frame.on('load error', function() {
	// wait some time to make sure the iframe stopped loading
	setTimeout(function() { loader.remove(); }, 500);
	})
	.parent().append(loader);
	}
	};

	/**
	* Checkbox wrapper
	*/
	function pretty_checkbox(checkbox)
	{
	var checkbox = $(checkbox),
	id = checkbox.attr('id');

	if (!id) {
	if (!env.icon_checkbox) env.icon_checkbox = 0;
	id = 'icochk' + (++env.icon_checkbox);
	checkbox.attr('id', id);
	}

	checkbox.addClass('icon-checkbox').after(
	$('<label>').attr({'for': id, title: checkbox.attr('title') \|\| ''})
	);
	};

	/**
	* HTML editor textarea wrapper with nice looking tabs-like switch
	*/
	function html_editor_init(obj)
	{
	// Here we support two structures
	// 1. <div><textarea></textarea><select name="editorSelector"></div>
	// 2. <tr><td><td><td><textarea></textarea></td></tr>
	// <tr><td><td><td><input type="checkbox"></td></tr>

	var sw, is_table = false,
	editor = $(obj),
	parent = editor.parent(),
	mode = function() {
	if (is_table) {
	return sw.is(':checked') ? 'html' : 'plain';
	}

	return sw.val();
	},
	tabs = $('<ul class="nav nav-tabs">')
	.append($('<li class="nav-item">')
	.append($('<a class="nav-link mode-html" href="#">')
	.text(rcmail.gettext('htmltoggle'))))
	.append($('<li class="nav-item">')
	.append($('<a class="nav-link mode-plain" href="#">')
	.text(rcmail.gettext('plaintoggle'))));

	if (parent.is('td')) {
	sw = $('input[type="checkbox"]', parent.parent().next());
	is_table = true;
	}
	else {
	sw = $('[name="editorSelector"]', obj.form);
	}

	// sanity check
	if (sw.length != 1) {
	return;
	}

	parent.addClass('html-editor');
	editor.before(tabs);

	$('a', tabs).attr('tabindex', editor.attr('tabindex'))
	.on('click', function(e) {
	var id = editor.attr('id'), is_html = $(this).is('.mode-html');

	e.preventDefault();
	if (rcmail.command('toggle-editor', {id: id, html: is_html}, '', e.originalEvent)) {
	$(this).tab('show');

	if (is_table) {
	sw.prop('checked', is_html);
	}
	}
	})
	.filter('.mode-' + mode()).tab('show');

	if (is_table) {
	// Hide unwanted table cells
	sw.parent().parent().hide();
	parent.prev().hide();
	// Modify the textarea cell to use 100% width
	parent.addClass('col-sm-12');
	}

	// make the textarea autoresizeable
	textarea_autoresize_init(editor);
	};

	/**
	* Make the textarea autoresizeable depending on it's content length.
	* The way there's no vertical scrollbar.
	*/
	function textarea_autoresize_init(textarea)
	{
	var resize = function(e) {
	clearTimeout(env.textarea_timer);
	env.textarea_timer = setTimeout(function() {
	var area = $(e.target),
	initial_height = area.data('initial-height'),
	scroll_height = area[0].scrollHeight;

	// do nothing when the area is hidden
	if (!scroll_height) {
	return;
	}

	if (!initial_height) {
	area.data('initial-height', initial_height = scroll_height);
	}

	// strange effect in Chrome/Firefox when you delete a line in the textarea
	// the scrollHeight is not decreased by the line height, but by 2px
	// so jumps up many times in small steps, we'd rather use one big step
	if (area.outerHeight() - scroll_height == 2) {
	scroll_height -= 19; // 21px is the assumed line height
	}

	area.outerHeight(Math.max(initial_height, scroll_height));
	}, 10);
	};

	$(textarea).css('overflow-y', 'hidden').on('input', resize).trigger('input');

	// Make sure the height is up-to-date also in time intervals
	setInterval(function() { $(textarea).trigger('input'); }, 1000);
	};

	// Inititalizes smart list input
	function smart_field_init(field)
	{
	var tip, id = field.id + '_list',
	area = $('<div class="multi-input"><div class="content"></div><div class="invalid-feedback"></div></div>'),
	list = field.value ? field.value.split("\n") : [''];

	if ($('#' + id).length) {
	return;
	}

	// add input rows
	$.each(list, function(i, v) {
	smart_field_row_add($('.content', area), v, field.name, i, $(field).data('size'));
	});

	area.attr('id', id);
	field = $(field);

	if (field.attr('disabled')) {
	area.hide();
	}
	// disable the original field anyway, we don't want it in POST
	else {
	field.prop('disabled', true);
	}

	field.after(area);

	if (field.hasClass('is-invalid')) {
	area.addClass('is-invalid');
	$('.invalid-feedback', area).text(field.data('error-msg'));
	}
	};

	function smart_field_row_add(area, value, name, idx, size, after)
	{
	// build row element content
	var input, elem = $('<div class="input-group">'
	+ '<input type="text" class="form-control">'
	+ '<a class="icon reset input-group-addon" href="#"></a>'
	+ '</div>'),
	attrs = {value: value, name: name + '[]'};

	if (size) {
	attrs.size = size;
	}

	input = $('input', elem).attr(attrs)
	.keydown(function(e) {
	var input = $(this);

	// element creation event (on Enter)
	if (e.which == 13) {
	var name = input.attr('name').replace(/\[\]$/, ''),
	dt = (new Date()).getTime(),
	elem = smart_field_row_add(area, '', name, dt, size, input.parent());

	$('input', elem).focus();
	}
	// backspace or delete: remove input, focus previous one
	else if ((e.which == 8 \|\| e.which == 46) && input.val() == '') {
	var parent = input.parent(),
	siblings = area.children();

	if (siblings.length > 1) {
	if (parent.prev().length) {
	parent.prev().children('input').focus();
	}
	else {
	parent.next().children('input').focus();
	}

	parent.remove();
	return false;
	}
	}
	});

	// element deletion event
	$('a.reset', elem).click(function() {
	var record = $(this.parentNode);

	if (area.children().length > 1) {
	record.remove();
	}
	else {
	$('input', record).val('').focus();
	}
	});

	$(elem).children()
	.on('focus', function() { area.addClass('focused'); })
	.on('blur', function() { area.removeClass('focused'); });

	if (after) {
	after.after(elem);
	}
	else {
	elem.appendTo(area);
	}

	return elem;
	};

	// Reset and fill the smart list input with new data
	function smart_field_reset(field, data)
	{
	var id = field.id + '_list',
	list = data.length ? data : [''],
	area = $('#' + id).children('.content');

	area.empty();

	// add input rows
	$.each(list, function(i, v) {
	smart_field_row_add(area, v, field.name, i, $(field).data('size'));
	});
	};

	/**
	* Register form errors, mark fields as invalid, dsplay the error below the input
	*/
	function form_errors(tips)
	{
	$.each(tips, function() {
	var input = $('#' + this[0]).addClass('is-invalid');

	if (input.data('type') == 'list') {
	input.data('error-msg', this[2]);
	return;
	}


	input.after($('<span class="invalid-feedback">').text(this[2]));
	});
	};

	/**
	* Show/hide the navigation list
	*/
	function switch_nav_list(obj)
	{
	var records, height, speed = 250,
	button = $('a.button', obj),
	navlist = $(obj).next();

	if (!navlist.height()) {
	records = $('tr,li', navlist).filter(function() { return this.style.display != 'none'; });
	height = $(records[0]).height() \|\| 50;

	navlist.animate({height: (Math.min(5, records.length) * height) + 'px'}, speed);
	button.addClass('collapse').removeClass('expand');
	}
	else {
	navlist.animate({height: '0'}, speed);
	button.addClass('expand').removeClass('collapse');
	}
	};

	/**
	* Wrapper for rcmail.open_window to intercept window opening
	* and display a dialog with an iframe instead of a real window.
	*/
	function window_open(url)
	{
	if (!is_mobile()) {
	return env.open_window.apply(rcmail, arguments);
	}

	// _extwin=1, _framed=1 are required to display attachment preview
	// layout properly and make mobile menus working
	url = rcmail.add_url(url, '_framed', 1);
	url = rcmail.add_url(url, '_extwin', 1);

	var label, title = '',
	props = {cancel_button: 'close', width: 768, height: 768},
	frame = $('<iframe>').attr({id: 'windowframe', src: url});

	if (/_action=([a-z_]+)/.test(url) && (label = rcmail.labels[RegExp.$1])) {
	title = label;
	}

	if (/_frame=1/.test(url)) {
	props.dialogClass = 'no-titlebar';
	}

	rcmail.simple_dialog(frame, title, null, props);

	return true;
	};

	/**
	* Get layout modes. In frame mode returns the parent layout modes.
	*/
	function layout_metadata()
	{
	if (is_framed) {
	var doc = $(parent.document.documentElement);

	return {
	mode: doc[0].className.match(/layout-([a-z]+)/) ? RegExp.$1 : mode,
	touch: doc.is('.touch'),
	};
	}

	return {mode: mode, touch: touch};
	};

	/**
	* Returns true if the layout is in 'small' or 'phone' mode
	*/
	function is_mobile()
	{
	var meta = layout_metadata();

	return meta.mode == 'phone' \|\| meta.mode == 'small';
	};

	/**
	* Returns true if the layout is in 'touch' mode
	*/
	function is_touch()
	{
	var meta = layout_metadata();

	return meta.touch;
	};
	}

	if (window.rcmail) {
	/**
	* Elastic version of show_menu as we don't need e.g. menu positioning from core
	* TODO: keyboard navigation in menus
	*/
	rcmail.show_menu = function(prop, show, event)
	{
	var name = typeof prop == 'object' ? prop.menu : prop,
	obj = $('#' + name);

	if (typeof prop == 'string') {
	prop = {menu: name};
	}

	// just delegate the action to rcube_elastic_ui
	return rcmail.triggerEvent(show === false ? 'menu-close' : 'menu-open', {name: name, obj: obj, props: prop, originalEvent: event});
	}

	/**
	* Elastic version of hide_menu as we don't need e.g. menus stack handling
	*/
	rcmail.hide_menu = function(name, event)
	{
	// delegate to rcube_elastic_ui
	return rcmail.triggerEvent('menu-close', {name: name, props: {menu: name}, originalEvent: event});
	}

	var UI = new rcube_elastic_ui();
	}
	else {
	// rcmail does not exists e.g. on the error template inside a frame
	// we fake the engine a little
	var rcmail = parent.rcmail;
	var rcube_webmail = parent.rcube_webmail;
	var UI = new rcube_elastic_ui();
	}

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