list.js
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	/**
	* Roundcube List Widget
	*
	* This file is part of the Roundcube Webmail client
	*
	* @licstart The following is the entire license notice for the
	* JavaScript code in this file.
	*
	* Copyright (c) The Roundcube Dev Team
	*
	* The JavaScript code in this page is free software: you can
	* redistribute it and/or modify it under the terms of the GNU
	* General Public License (GNU GPL) as published by the Free Software
	* Foundation, either version 3 of the License, or (at your option)
	* any later version. The code is distributed WITHOUT ANY WARRANTY;
	* without even the implied warranty of MERCHANTABILITY or FITNESS
	* FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
	*
	* As additional permission under GNU GPL version 3 section 7, you
	* may distribute non-source (e.g., minimized or compacted) forms of
	* that code without the copy of the GNU GPL normally required by
	* section 4, provided you include this license notice and a URL
	* through which recipients can access the Corresponding Source.
	*
	* @licend The above is the entire license notice
	* for the JavaScript code in this file.
	*
	* @author Thomas Bruederli <roundcube@gmail.com>
	* @author Charles McNulty <charles@charlesmcnulty.com>
	*
	* @requires jquery.js, common.js
	*/


	/**
	* Roundcube List Widget class
	* @constructor
	*/
	function rcube_list_widget(list, p)
	{
	// static constants
	this.ENTER_KEY = 13;
	this.DELETE_KEY = 46;
	this.BACKSPACE_KEY = 8;

	this.list = list ? list : null;
	this.tagname = this.list ? this.list.nodeName.toLowerCase() : 'table';
	this.id_regexp = /^rcmrow([a-z0-9\-_=\+\/]+)/i;
	this.rows = {};
	this.selection = [];
	this.rowcount = 0;
	this.colcount = 0;

	this.subject_col = 0;
	this.modkey = 0;
	this.multiselect = false;
	this.multiexpand = false;
	this.multi_selecting = false;
	this.draggable = false;
	this.column_movable = false;
	this.keyboard = false;
	this.toggleselect = false;
	this.aria_listbox = false;
	this.parent_focus = true;
	this.checkbox_selection = false;

	this.drag_active = false;
	this.col_drag_active = false;
	this.column_fixed = null;
	this.last_selected = null;
	this.shift_start = null;
	this.focused = false;
	this.drag_mouse_start = null;
	this.dblclick_time = 500; // default value on MS Windows is 500
	this.row_init = function(){}; // @deprecated; use list.addEventListener('initrow') instead

	this.touch_start_time = 0; // start time of the touch event
	this.touch_event_time = 500; // maximum time a touch should be considered a left mouse button event, after this its something else (eg contextmenu event)

	// overwrite default parameters
	if (p && typeof p === 'object')
	for (var n in p)
	this[n] = p[n];

	// register this instance
	rcube_list_widget._instances.push(this);
	};


	rcube_list_widget.prototype = {


	/**
	* get all message rows from HTML table and init each row
	*/
	init: function()
	{
	if (this.tagname == 'table' && this.list && this.list.tBodies[0]) {
	this.thead = this.list.tHead;
	this.tbody = this.list.tBodies[0];
	}
	else if (this.tagname != 'table' && this.list) {
	this.tbody = this.list;
	}

	if ($(this.list).attr('role') == 'listbox') {
	this.aria_listbox = true;
	if (this.multiselect)
	$(this.list).attr('aria-multiselectable', 'true');
	}

	var me = this;

	if (this.tbody) {
	this.rows = {};
	this.rowcount = 0;

	var r, len, rows = this.tbody.childNodes;

	for (r=0, len=rows.length; r<len; r++) {
	if (rows[r].nodeType == 1)
	this.rowcount += this.init_row(rows[r]) ? 1 : 0;
	}

	this.init_header();
	this.frame = this.list.parentNode;

	// set body events
	if (this.keyboard) {
	rcube_event.add_listener({event:'keydown', object:this, method:'key_press'});

	// allow the table element to receive focus.
	$(this.list).attr('tabindex', '0')
	.on('focus', function(e) { me.focus(e); });
	}
	}

	if (this.parent_focus) {
	this.list.parentNode.onclick = function(e) { me.focus(); };
	}

	rcmail.triggerEvent('initlist', { obj: this.list });

	return this;
	},


	/**
	* Init list row and set mouse events on it
	*/
	init_row: function(row)
	{
	row.uid = this.get_row_uid(row);

	// make references in internal array and set event handlers
	if (row && row.uid) {
	var self = this, uid = row.uid;
	this.rows[uid] = {uid:uid, id:row.id, obj:row};

	$(row).data('uid', uid)
	// set eventhandlers to table row (only left-button-clicks in mouseup)
	.mousedown(function(e) { return self.drag_row(e, this.uid); })
	.mouseup(function(e) {
	if (e.which == 1 && !self.drag_active && !$(e.currentTarget).is('.ui-droppable-active'))
	return self.click_row(e, this.uid);
	else
	return true;
	});

	// for IE and Edge (Trident) differentiate between touch, touch+hold using pointer events rather than touch
	if ((bw.ie \|\| (bw.edge && bw.vendver < 75)) && bw.pointer) {
	$(row).on('pointerdown', function(e) {
	if (e.pointerType == 'touch') {
	self.touch_start_time = new Date().getTime();
	return false;
	}
	})
	.on('pointerup', function(e) {
	if (e.pointerType == 'touch') {
	var duration = (new Date().getTime() - self.touch_start_time);
	if (duration <= self.touch_event_time) {
	self.drag_row(e, this.uid);
	return self.click_row(e, this.uid);
	}
	}
	});
	}
	else if (bw.touch && row.addEventListener) {
	row.addEventListener('touchstart', function(e) {
	if (e.touches.length == 1) {
	self.touchmoved = false;
	self.drag_row(rcube_event.touchevent(e.touches[0]), this.uid);
	self.touch_start_time = new Date().getTime();
	}
	}, false);
	row.addEventListener('touchend', function(e) {
	if (e.changedTouches.length == 1) {
	var duration = (new Date().getTime() - self.touch_start_time);
	if (!self.touchmoved && duration <= self.touch_event_time && !self.click_row(rcube_event.touchevent(e.changedTouches[0]), this.uid))
	e.preventDefault();
	}
	}, false);
	row.addEventListener('touchmove', function(e) {
	if (e.changedTouches.length == 1) {
	self.touchmoved = true;
	if (self.drag_active)
	e.preventDefault();
	}
	}, false);
	}

	// label the list row with the subject col as descriptive label
	if (this.aria_listbox) {
	var lbl_id = 'l:' + row.id;
	$(row)
	.attr('role', 'option')
	.attr('aria-labelledby', lbl_id)
	.find(this.col_tagname()).eq(this.subject_column()).attr('id', lbl_id);
	}

	if (document.all)
	row.onselectstart = function() { return false; };

	this.row_init(this.rows[uid]); // legacy support
	this.triggerEvent('initrow', this.rows[uid]);

	return true;
	}
	},


	/**
	* Init list column headers and set mouse events on them
	*/
	init_header: function()
	{
	if (this.thead) {
	this.colcount = 0;

	if (this.fixed_header) { // copy (modified) fixed header back to the actual table
	$(this.list.tHead).replaceWith($(this.fixed_header).find('thead').clone());
	$(this.list.tHead).find('th,td').attr('style', '').find('a').attr('tabindex', '-1'); // remove fixed widths
	}
	else if (!bw.touch && this.list.className.indexOf('fixedheader') >= 0) {
	this.init_fixed_header();
	}

	var col, r, p = this;
	// add events for list columns moving
	if (this.column_movable && this.thead && this.thead.rows) {
	for (r=0; r<this.thead.rows[0].cells.length; r++) {
	if (this.column_fixed == r)
	continue;
	col = this.thead.rows[0].cells[r];
	col.onmousedown = function(e) { return p.drag_column(e, this); };
	this.colcount++;
	}
	}
	}
	},

	/**
	* Set the scrollable parent object for the table's fixed header
	*/
	container: window,

	init_fixed_header: function()
	{
	var clone = $(this.list.tHead).clone();

	if (!this.fixed_header) {
	this.fixed_header = $('<table>')
	.attr('id', this.list.id + '-fixedcopy')
	.attr('class', this.list.className + ' fixedcopy')
	.attr('role', 'presentation')
	.css({ position:'fixed' })
	.append(clone)
	.append('<tbody></tbody>');
	$(this.list).before(this.fixed_header);

	var me = this;
	$(window).on('resize', function() { me.resize(); });
	$(this.container).on('scroll', function() {
	var w = $(this);
	me.fixed_header.css({
	marginLeft: -w.scrollLeft() + 'px',
	marginTop: -w.scrollTop() + 'px'
	});
	});
	}
	else {
	$(this.fixed_header).find('thead').replaceWith(clone);
	}

	// avoid scrolling header links being focused
	$(this.list.tHead).find('a.sortcol').attr('tabindex', '-1');

	// set tabindex to fixed header sort links
	clone.find('a.sortcol').attr('tabindex', '0');

	this.thead = clone.get(0);
	this.resize();
	},

	resize: function()
	{
	if (!this.fixed_header)
	return;

	var column_widths = [];

	// get column widths from original thead
	$(this.tbody).parent().find('thead th,thead td').each(function(index) {
	column_widths[index] = $(this).width();
	});

	// apply fixed widths to fixed table header
	$(this.thead).parent().width($(this.tbody).parent().width());
	$(this.thead).find('th,td').each(function(index) {
	$(this).width(column_widths[index]);
	});

	$(window).scroll();
	},

	/**
	* Remove all list rows
	*/
	clear: function(sel)
	{
	if (this.tagname == 'table') {
	var tbody = document.createElement('tbody');
	this.list.insertBefore(tbody, this.tbody);
	this.list.removeChild(this.list.tBodies[1]);
	this.tbody = tbody;
	}
	else {
	$(this.row_tagname() + ':not(.thead)', this.tbody).remove();
	}

	this.rows = {};
	this.rowcount = 0;
	this.last_selected = null;

	if (sel)
	this.clear_selection();

	// reset scroll position (in Opera)
	if (this.frame)
	this.frame.scrollTop = 0;

	// fix list header after removing any rows
	this.resize();
	},


	/**
	* 'remove' message row from list (just hide it)
	*/
	remove_row: function(uid, sel_next)
	{
	var self = this, node = this.rows[uid] ? this.rows[uid].obj : null;

	if (!node)
	return;

	node.style.display = 'none';

	// Select next row before deletion, because we need the reference
	if (sel_next)
	this.select_next(uid);

	delete this.rows[uid];
	this.rowcount--;

	// fix list header after removing any rows
	clearTimeout(this.resize_timeout)
	this.resize_timeout = setTimeout(function() { self.resize(); }, 50);
	},


	/**
	* Add row to the list and initialize it
	*/
	insert_row: function(row, before)
	{
	var self = this, tbody = this.tbody;

	// create a real dom node first
	if (row.nodeName === undefined) {
	// for performance reasons use DOM instead of jQuery here
	var i, e, domcell, col,
	domrow = document.createElement(this.row_tagname());

	if (row.id) domrow.id = row.id;
	if (row.uid) domrow.uid = row.uid;
	if (row.className) domrow.className = row.className;
	if (row.style) $.extend(domrow.style, row.style);

	for (i=0; row.cols && i < row.cols.length; i++) {
	col = row.cols[i];
	domcell = col.dom;
	if (!domcell) {
	domcell = document.createElement(this.col_tagname());
	if (col.className) domcell.className = col.className;
	if (col.innerHTML) domcell.innerHTML = col.innerHTML;
	for (e in col.events)
	domcell['on' + e] = col.events[e];
	}
	domrow.appendChild(domcell);
	}

	row = domrow;
	}

	if (this.checkbox_selection) {
	this.insert_checkbox(row);
	}

	if (before && tbody.childNodes.length)
	tbody.insertBefore(row, (typeof before == 'object' && before.parentNode == tbody) ? before : tbody.firstChild);
	else
	tbody.appendChild(row);

	this.init_row(row);
	this.rowcount++;

	// fix list header after adding any rows
	clearTimeout(this.resize_timeout)
	this.resize_timeout = setTimeout(function() { self.resize(); }, 50);
	},

	/**
	* Update existing record
	*/
	update_row: function(id, cols, newid, select)
	{
	var row = this.rows[id];
	if (!row) return false;

	var i, domrow = row.obj;
	for (i = 0; cols && i < cols.length; i++) {
	this.get_cell(domrow, i).html(cols[i]);
	}

	if (newid) {
	delete this.rows[id];
	domrow.uid = newid;
	domrow.id = 'rcmrow' + newid;
	this.init_row(domrow);

	if (select)
	this.selection[0] = newid;

	if (this.last_selected == id)
	this.last_selected = newid;
	}
	},

	/**
	* Add selection checkbox to the list record
	*/
	insert_checkbox: function(row, tag_name)
	{
	var key, self = this,
	cell = document.createElement(this.col_tagname(tag_name)),
	chbox = document.createElement('input');

	chbox.type = 'checkbox';
	chbox.tabIndex = -1;
	chbox.onchange = function(e) {
	self.select_row(row.uid, key \|\| CONTROL_KEY, true);
	e.stopPropagation();
	key = null;
	};
	chbox.onmousedown = function(e) {
	key = rcube_event.get_modifier(e);
	};

	cell.className = 'selection';
	// make the whole cell "touchable" for touch devices
	cell.onclick = function(e) {
	if (!$(e.target).is('input')) {
	key = rcube_event.get_modifier(e);
	$(chbox).prop('checked', !chbox.checked).change();
	}
	e.stopPropagation();
	};

	cell.appendChild(chbox);

	row.insertBefore(cell, row.firstChild);
	},

	/**
	* Enable checkbox selection
	*/
	enable_checkbox_selection: function()
	{
	this.checkbox_selection = true;

	// Add checkbox to existing records if any
	var r, len, cell, rows,
	row_tag = this.row_tagname().toUpperCase();

	if (this.thead) {
	rows = this.thead.childNodes;
	for (r=0, len=rows.length; r<len; r++) {
	if (rows[r].nodeName == row_tag && (cell = rows[r].firstChild)) {
	if (cell.className == 'selection')
	break;
	this.insert_checkbox(rows[r], 'thead');
	}
	}
	}

	rows = this.tbody.childNodes;
	for (r=0, len=rows.length; r<len; r++) {
	if (rows[r].nodeName == row_tag && (cell = rows[r].firstChild)) {
	if (cell.className == 'selection')
	break;
	this.insert_checkbox(rows[r], 'tbody');
	}
	}
	},

	/**
	* Set focus to the list
	*/
	focus: function(e)
	{
	if (this.focused)
	return;

	this.focused = true;

	if (e)
	rcube_event.cancel(e);

	var focus_elem = null;

	if (this.last_selected && this.rows[this.last_selected]) {
	focus_elem = $(this.rows[this.last_selected].obj).find(this.col_tagname()).eq(this.subject_column()).attr('tabindex', '0');
	}

	// Un-focus already focused elements (#1487123, #1487316, #1488600, #1488620)
	if (focus_elem && focus_elem.length) {
	// We now fix this by explicitly assigning focus to a dedicated link element
	this.focus_noscroll(focus_elem);
	}
	else {
	// It looks that window.focus() does the job for all browsers, but not Firefox (#1489058)
	$('iframe,:focus:not(body)').blur();
	window.focus();
	}

	$(this.list).addClass('focus').removeAttr('tabindex');

	// set internal focus pointer to first row
	if (!this.last_selected)
	this.select_first(CONTROL_KEY);
	},


	/**
	* remove focus from the list
	*/
	blur: function(e)
	{
	this.focused = false;

	// avoid the table getting focus right again (on Shift+Tab)
	var me = this;
	setTimeout(function() { $(me.list).attr('tabindex', '0'); }, 20);

	if (this.last_selected && this.rows[this.last_selected]) {
	$(this.rows[this.last_selected].obj)
	.find(this.col_tagname()).eq(this.subject_column()).removeAttr('tabindex');
	}

	$(this.list).removeClass('focus');
	},

	/**
	* Focus the given element without scrolling the list container
	*/
	focus_noscroll: function(elem)
	{
	var y = this.frame.scrollTop \|\| this.frame.scrollY;
	elem.focus();
	this.frame.scrollTop = y;
	},


	/**
	* Set/unset the given column as hidden
	*/
	hide_column: function(col, hide)
	{
	var method = hide ? 'addClass' : 'removeClass';

	if (this.fixed_header)
	$(this.row_tagname()+' '+this.col_tagname()+'.'+col, this.fixed_header)[method]('hidden');

	$(this.row_tagname()+' '+this.col_tagname()+'.'+col, this.list)[method]('hidden');
	},


	/**
	* onmousedown-handler of message list column
	*/
	drag_column: function(e, col)
	{
	if (this.colcount > 1) {
	this.drag_start = true;
	this.drag_mouse_start = rcube_event.get_mouse_pos(e);

	rcube_event.add_listener({event:'mousemove', object:this, method:'column_drag_mouse_move'});
	rcube_event.add_listener({event:'mouseup', object:this, method:'column_drag_mouse_up'});

	// enable dragging over iframes
	this.add_dragfix();

	// find selected column number
	for (var i=0; i<this.thead.rows[0].cells.length; i++) {
	if (col == this.thead.rows[0].cells[i]) {
	this.selected_column = i;
	break;
	}
	}
	}

	return false;
	},


	/**
	* onmousedown-handler of message list row
	*/
	drag_row: function(e, id)
	{
	// don't do anything (another action processed before)
	if (!this.is_event_target(e))
	return true;

	// handle only left-clicks
	if (rcube_event.get_button(e) != 0)
	return true;

	this.in_selection_before = e && e.istouch \|\| this.in_selection(id) ? id : false;

	// selects currently unselected row
	if (!this.in_selection_before) {
	var mod_key = rcube_event.get_modifier(e);
	this.select_row(id, mod_key, true);
	}

	if (this.draggable && this.selection.length && this.in_selection(id)) {
	this.drag_start = true;
	this.drag_mouse_start = rcube_event.get_mouse_pos(e);

	rcube_event.add_listener({event:'mousemove', object:this, method:'drag_mouse_move'});
	rcube_event.add_listener({event:'mouseup', object:this, method:'drag_mouse_up'});

	if (bw.touch) {
	rcube_event.add_listener({event:'touchmove', object:this, method:'drag_mouse_move'});
	rcube_event.add_listener({event:'touchend', object:this, method:'drag_mouse_up'});
	}

	// enable dragging over iframes
	this.add_dragfix();
	this.focus();
	}

	return false;
	},


	/**
	* onmouseup-handler of message list row
	*/
	click_row: function(e, id)
	{
	// sanity check
	if (!id \|\| !this.rows[id])
	return false;

	// don't do anything (another action processed before)
	if (!this.is_event_target(e))
	return true;

	var now = new Date().getTime(),
	dblclicked = now - this.rows[id].clicked < this.dblclick_time;

	// unselects currently selected row
	if (!this.drag_active && !dblclicked && this.in_selection_before == id)
	this.select_row(id, rcube_event.get_modifier(e), true);

	this.drag_start = false;
	this.in_selection_before = false;

	// row was double clicked
	if (this.rowcount && dblclicked && this.in_selection(id)) {
	this.triggerEvent('dblclick');
	now = 0;
	}
	else
	this.triggerEvent('click');

	if (!this.drag_active) {
	// remove temp divs
	this.del_dragfix();
	rcube_event.cancel(e);
	}

	this.rows[id].clicked = now;
	this.focus();

	return false;
	},


	/**
	* Check target of the current event
	*/
	is_event_target: function(e)
	{
	var target = rcube_event.get_target(e),
	tagname = target.tagName.toLowerCase();

	return !(target && (tagname == 'input' \|\| tagname == 'img' \|\| (tagname != 'a' && target.onclick) \|\| $(target).data('action-link')));
	},


	/*
	* Returns thread root ID for specified row ID
	*/
	find_root: function(uid)
	{
	var r = this.rows[uid];

	if (r && r.parent_uid)
	return this.find_root(r.parent_uid);
	else
	return uid;
	},


	expand_row: function(e, id)
	{
	var row = this.rows[id],
	evtarget = rcube_event.get_target(e),
	mod_key = rcube_event.get_modifier(e),
	action = (row.expanded ? 'collapse' : 'expand') + (mod_key == CONTROL_KEY \|\| this.multiexpand ? '_all' : '');

	// Don't treat double click on the expando as double click on the message.
	row.clicked = 0;

	this[action](row);
	},

	collapse: function(row)
	{
	var r, depth = row.depth,
	new_row = row ? row.obj.nextSibling : null;

	row.expanded = false;
	this.update_expando(row.id);
	this.triggerEvent('expandcollapse', { uid:row.uid, expanded:row.expanded, obj:row.obj });

	while (new_row) {
	if (new_row.nodeType == 1) {
	r = this.rows[new_row.uid];
	if (r && r.depth <= depth)
	break;

	$(new_row).css('display', 'none');
	if (r.expanded) {
	r.expanded = false;
	this.triggerEvent('expandcollapse', { uid:r.uid, expanded:r.expanded, obj:new_row });
	}
	}
	new_row = new_row.nextSibling;
	}

	this.resize();
	this.triggerEvent('listupdate');

	return false;
	},

	expand: function(row)
	{
	var r, p, depth, new_row, last_expanded_parent_depth;

	if (row) {
	row.expanded = true;
	depth = row.depth;
	new_row = row.obj.nextSibling;
	this.update_expando(row.id, true);
	this.triggerEvent('expandcollapse', { uid:row.uid, expanded:row.expanded, obj:row.obj });
	}
	else {
	var tbody = this.tbody;
	new_row = tbody.firstChild;
	depth = 0;
	last_expanded_parent_depth = 0;
	}

	while (new_row) {
	if (new_row.nodeType == 1) {
	r = this.rows[new_row.uid];
	if (r) {
	if (row && (!r.depth \|\| r.depth <= depth))
	break;

	if (r.parent_uid) {
	p = this.rows[r.parent_uid];
	if (p && p.expanded) {
	if ((row && p == row) \|\| last_expanded_parent_depth >= p.depth - 1) {
	last_expanded_parent_depth = p.depth;
	$(new_row).css('display', '');
	r.expanded = true;
	this.update_expando(r.id, true);
	this.triggerEvent('expandcollapse', { uid:r.uid, expanded:r.expanded, obj:new_row });
	}
	}
	else
	if (row && (! p \|\| p.depth <= depth))
	break;
	}
	}
	}
	new_row = new_row.nextSibling;
	}

	this.resize();
	this.triggerEvent('listupdate');

	return false;
	},


	collapse_all: function(row)
	{
	var depth, new_row, r;

	if (row) {
	row.expanded = false;
	depth = row.depth;
	new_row = row.obj.nextSibling;
	this.update_expando(row.id);
	this.triggerEvent('expandcollapse', { uid:row.uid, expanded:row.expanded, obj:row.obj });

	// don't collapse sub-root tree in multiexpand mode
	if (depth && this.multiexpand)
	return false;
	}
	else {
	new_row = this.tbody.firstChild;
	depth = 0;
	}

	while (new_row) {
	if (new_row.nodeType == 1) {
	if (r = this.rows[new_row.uid]) {
	if (row && (!r.depth \|\| r.depth <= depth))
	break;

	if (row \|\| r.depth)
	$(new_row).css('display', 'none');
	if (r.expanded) {
	r.expanded = false;
	if (r.has_children) {
	this.update_expando(r.id);
	this.triggerEvent('expandcollapse', { uid:r.uid, expanded:r.expanded, obj:new_row });
	}
	}
	}
	}
	new_row = new_row.nextSibling;
	}

	this.resize();
	this.triggerEvent('listupdate');

	return false;
	},


	expand_all: function(row)
	{
	var depth, new_row, r;

	if (row) {
	row.expanded = true;
	depth = row.depth;
	new_row = row.obj.nextSibling;
	this.update_expando(row.id, true);
	this.triggerEvent('expandcollapse', { uid:row.uid, expanded:row.expanded, obj:row.obj });
	}
	else {
	new_row = this.tbody.firstChild;
	depth = 0;
	}

	while (new_row) {
	if (new_row.nodeType == 1) {
	if (r = this.rows[new_row.uid]) {
	if (row && r.depth <= depth)
	break;

	$(new_row).css('display', '');
	if (!r.expanded) {
	r.expanded = true;
	if (r.has_children) {
	this.update_expando(r.id, true);
	this.triggerEvent('expandcollapse', { uid:r.uid, expanded:r.expanded, obj:new_row });
	}
	}
	}
	}
	new_row = new_row.nextSibling;
	}

	this.resize();
	this.triggerEvent('listupdate');

	return false;
	},


	update_expando: function(id, expanded)
	{
	var expando = document.getElementById('rcmexpando' + id);
	if (expando)
	expando.className = expanded ? 'expanded' : 'collapsed';
	},

	get_row_uid: function(row)
	{
	if (!row)
	return;

	if (!row.uid) {
	var uid = $(row).data('uid');
	if (uid)
	row.uid = uid;
	else if (String(row.id).match(this.id_regexp))
	row.uid = RegExp.$1;
	}

	return row.uid;
	},

	/**
	* get first/next/previous/last rows that are not hidden
	*/
	get_next_row: function(uid)
	{
	if (!this.rowcount)
	return false;

	var last_selected_row = this.rows[uid \|\| this.last_selected],
	new_row = last_selected_row ? last_selected_row.obj.nextSibling : null;

	while (new_row && (new_row.nodeType != 1 \|\| new_row.style.display == 'none'))
	new_row = new_row.nextSibling;

	return new_row;
	},

	get_prev_row: function(uid)
	{
	if (!this.rowcount)
	return false;

	var last_selected_row = this.rows[uid \|\| this.last_selected],
	new_row = last_selected_row ? last_selected_row.obj.previousSibling : null;

	while (new_row && (new_row.nodeType != 1 \|\| new_row.style.display == 'none'))
	new_row = new_row.previousSibling;

	return new_row;
	},

	get_first_row: function()
	{
	if (this.rowcount) {
	var i, uid, rows = this.tbody.childNodes;

	for (i=0; i<rows.length; i++)
	if (rows[i].id && (uid = this.get_row_uid(rows[i])) && this.rows[uid])
	return uid;
	}

	return null;
	},

	get_last_row: function()
	{
	if (this.rowcount) {
	var i, uid, rows = this.tbody.childNodes;

	for (i=rows.length-1; i>=0; i--)
	if (rows[i].id && (uid = this.get_row_uid(rows[i])) && this.rows[uid])
	return uid;
	}

	return null;
	},

	get_next: function()
	{
	var row;
	if (row = this.get_next_row()) {
	return row.uid;
	}
	},

	get_prev: function()
	{
	var row;
	if (row = this.get_prev_row()) {
	return row.uid;
	}
	},

	row_tagname: function()
	{
	var row_tagnames = { table:'tr', ul:'li', '*':'div' };
	return row_tagnames[this.tagname] \|\| row_tagnames['*'];
	},

	col_tagname: function(tagname)
	{
	var col_tagnames = { table:'td', thead:'th', tbody:'td', '*':'span' };
	return col_tagnames[tagname \|\| this.tagname] \|\| col_tagnames['*'];
	},

	get_cell: function(row, index)
	{
	return $(this.col_tagname(), row).eq(index + (this.checkbox_selection ? 1 : 0));
	},

	/**
	* selects or unselects the proper row depending on the modifier key pressed
	*/
	select_row: function(id, mod_key, with_mouse)
	{
	var select_before = this.selection.join(','),
	in_selection_before = this.in_selection(id);

	if (!this.multiselect && with_mouse)
	mod_key = 0;

	if (!this.shift_start)
	this.shift_start = id

	if (!mod_key) {
	this.shift_start = id;
	this.highlight_row(id, false);
	this.multi_selecting = false;
	}
	else {
	switch (mod_key) {
	case SHIFT_KEY:
	this.shift_select(id, false);
	break;

	case CONTROL_KEY:
	if (with_mouse) {
	this.shift_start = id;
	this.highlight_row(id, true);
	}
	break;

	case CONTROL_SHIFT_KEY:
	this.shift_select(id, true);
	break;

	default:
	this.highlight_row(id, false);
	break;
	}

	this.multi_selecting = true;
	}

	if (this.last_selected && this.rows[this.last_selected]) {
	$(this.rows[this.last_selected].obj).removeClass('focused')
	.find(this.col_tagname()).eq(this.subject_column()).removeAttr('tabindex');
	}

	// unselect if toggleselect is active and the same row was clicked again
	if (this.toggleselect && in_selection_before && !mod_key) {
	this.clear_selection();
	}
	// trigger event if selection changed
	else if (this.selection.join(',') != select_before) {
	this.triggerEvent('select');
	}

	if (this.rows[id]) {
	$(this.rows[id].obj).addClass('focused');
	// set cursor focus to link inside selected row
	if (this.focused)
	this.focus_noscroll($(this.rows[id].obj).find(this.col_tagname()).eq(this.subject_column()).attr('tabindex', '0'));
	}

	if (!this.selection.length)
	this.shift_start = null;

	this.last_selected = id;
	},


	/**
	* Alias method for select_row
	*/
	select: function(id)
	{
	this.select_row(id, false);
	this.scrollto(id);
	},


	/**
	* Select row next to the specified or last selected one
	* Either below or above.
	*/
	select_next: function(uid)
	{
	var new_row = this.get_next_row(uid) \|\| this.get_prev_row(uid);
	if (new_row)
	this.select_row(new_row.uid, false, false);
	},


	/**
	* Select first row
	*/
	select_first: function(mod_key, noscroll)
	{
	var row = this.get_first_row();
	if (row) {
	this.select_row(row, mod_key, false);

	if (!noscroll)
	this.scrollto(row);
	}
	},


	/**
	* Select last row
	*/
	select_last: function(mod_key, noscroll)
	{
	var row = this.get_last_row();
	if (row) {
	this.select_row(row, mod_key, false);

	if (!noscroll)
	this.scrollto(row);
	}
	},


	/**
	* Add all children of the given row to selection
	*/
	select_children: function(uid)
	{
	var i, children = this.row_children(uid), len = children.length;

	for (i=0; i<len; i++)
	if (!this.in_selection(children[i]))
	this.select_row(children[i], CONTROL_KEY, true);
	},


	/**
	* Perform selection when shift key is pressed
	*/
	shift_select: function(id, control)
	{
	if (!this.rows[this.shift_start] \|\| !this.selection.length)
	this.shift_start = id;

	var n, i, j, to_row = this.rows[id],
	from_rowIndex = this._rowIndex(this.rows[this.shift_start].obj),
	to_rowIndex = this._rowIndex(to_row.obj);

	// if we're going down the list, and we hit a thread, and it's closed, select the whole thread
	if (from_rowIndex < to_rowIndex && !to_row.expanded && to_row.has_children)
	if (to_row = this.rows[(this.row_children(id)).pop()])
	to_rowIndex = this._rowIndex(to_row.obj);

	i = ((from_rowIndex < to_rowIndex) ? from_rowIndex : to_rowIndex),
	j = ((from_rowIndex > to_rowIndex) ? from_rowIndex : to_rowIndex);

	// iterate through the entire message list
	for (n in this.rows) {
	if (this._rowIndex(this.rows[n].obj) >= i && this._rowIndex(this.rows[n].obj) <= j) {
	if (!this.in_selection(n)) {
	this.highlight_row(n, true);
	}
	}
	else {
	if (this.in_selection(n) && !control) {
	this.highlight_row(n, true);
	}
	}
	}
	},


	/**
	* Helper method to emulate the rowIndex property of non-tr elements
	*/
	_rowIndex: function(obj)
	{
	return (obj.rowIndex !== undefined) ? obj.rowIndex : $(obj).prevAll().length;
	},

	/**
	* Check if given id is part of the current selection
	*/
	in_selection: function(id, index)
	{
	for (var n in this.selection)
	if (this.selection[n] == id)
	return index ? parseInt(n) : true;

	return false;
	},


	/**
	* Select each row in list
	*/
	select_all: function(filter)
	{
	if (!this.rowcount)
	return false;

	// reset but remember selection first
	var n, select_before = this.selection.join(',');
	this.selection = [];

	for (n in this.rows) {
	if (!filter \|\| this.rows[n][filter] == true) {
	this.last_selected = n;
	this.highlight_row(n, true, true);
	}
	else {
	$(this.rows[n].obj).removeClass('selected').removeAttr('aria-selected');
	}
	}

	// trigger event if selection changed
	if (this.selection.join(',') != select_before)
	this.triggerEvent('select');

	this.focus();

	return true;
	},


	/**
	* Invert selection
	*/
	invert_selection: function()
	{
	if (!this.rowcount)
	return false;

	// remember old selection
	var n, select_before = this.selection.join(',');

	for (n in this.rows)
	this.highlight_row(n, true);

	// trigger event if selection changed
	if (this.selection.join(',') != select_before)
	this.triggerEvent('select');

	this.focus();

	return true;
	},


	/**
	* Unselect selected row(s)
	*/
	clear_selection: function(id, no_event)
	{
	var n, num_select = this.selection.length;

	// one row
	if (id) {
	for (n in this.selection)
	if (this.selection[n] == id) {
	this.selection.splice(n,1);
	break;
	}
	}
	// all rows
	else {
	for (n in this.selection)
	if (this.rows[this.selection[n]]) {
	$(this.rows[this.selection[n]].obj).removeClass('selected').removeAttr('aria-selected');
	}

	this.selection = [];
	}

	if (this.checkbox_selection)
	$(this.row_tagname() + ':not(.selected) > .selection > input:checked', this.list).prop('checked', false);

	if (num_select && !this.selection.length && !no_event) {
	this.triggerEvent('select');
	this.last_selected = null;
	}
	},


	/**
	* Getter for the selection array
	*/
	get_selection: function(deep)
	{
	var res = $.merge([], this.selection);

	var props = {deep: deep, res: res};
	if (this.triggerEvent('getselection', props) === false)
	return props.res;

	// return children of selected threads even if only root is selected
	if (deep !== false && res.length) {
	for (var uid, uids, i=0, len=res.length; i<len; i++) {
	uid = res[i];
	if (this.rows[uid] && this.rows[uid].has_children && !this.rows[uid].expanded) {
	uids = this.row_children(uid);
	for (var j=0, uids_len=uids.length; j<uids_len; j++) {
	uid = uids[j];
	if (!this.in_selection(uid))
	res.push(uid);
	}
	}
	}
	}

	return res;
	},


	/**
	* Return the ID if only one row is selected
	*/
	get_single_selection: function()
	{
	var selection = this.get_selection(false);

	if (selection.length == 1)
	return selection[0];
	else
	return null;
	},


	/**
	* Highlight/unhighlight a row
	*/
	highlight_row: function(id, multiple, norecur)
	{
	if (!this.rows[id])
	return;

	if (!multiple) {
	if (this.selection.length > 1 \|\| !this.in_selection(id)) {
	this.clear_selection(null, true);
	this.selection[0] = id;
	$(this.rows[id].obj).addClass('selected').attr('aria-selected', 'true');

	if (this.checkbox_selection)
	$('.selection > input', this.rows[id].obj).prop('checked', true);
	}
	}
	else {
	var pre, post, p = this.in_selection(id, true);

	if (p === false) { // select row
	this.selection.push(id);
	$(this.rows[id].obj).addClass('selected').attr('aria-selected', 'true');

	if (this.checkbox_selection)
	$('.selection > input', this.rows[id].obj).prop('checked', true);

	if (!norecur && !this.rows[id].expanded)
	this.highlight_children(id, true);
	}
	else { // unselect row
	pre = this.selection.slice(0, p);
	post = this.selection.slice(p+1, this.selection.length);

	this.selection = pre.concat(post);
	$(this.rows[id].obj).removeClass('selected').removeAttr('aria-selected');

	if (this.checkbox_selection)
	$('.selection > input', this.rows[id].obj).prop('checked', false);

	if (!norecur && !this.rows[id].expanded)
	this.highlight_children(id, false);
	}
	}
	},


	/**
	* Highlight/unhighlight all children of the given row
	*/
	highlight_children: function(id, status)
	{
	var i, selected,
	children = this.row_children(id), len = children.length;

	for (i=0; i<len; i++) {
	selected = this.in_selection(children[i]);
	if ((status && !selected) \|\| (!status && selected))
	this.highlight_row(children[i], true, true);
	}
	},


	/**
	* Handler for keyboard events
	*/
	key_press: function(e)
	{
	if (!this.focused \|\| $(e.target).is('input,textarea,select'))
	return true;

	var keyCode = rcube_event.get_keycode(e),
	mod_key = rcube_event.get_modifier(e);

	switch (keyCode) {
	case 37: // Left arrow
	case 39: // Right arrow
	case 40: // Up arrow
	case 38: // Down arrow
	case 63233: // "down" in Safari keypress
	case 63232: // "up" in Safari keypress
	// Stop propagation so that the browser doesn't scroll
	rcube_event.cancel(e);
	return this.use_arrow_key(keyCode, mod_key);

	case 32: // Space
	rcube_event.cancel(e);
	return this.select_row(this.last_selected, mod_key, true);

	case 36: // Home
	this.select_first(mod_key);
	return rcube_event.cancel(e);

	case 35: // End
	this.select_last(mod_key);
	return rcube_event.cancel(e);

	case 65: // Ctrl + A
	if (mod_key == CONTROL_KEY && this.multiselect) {
	this.select_first(null, true);
	this.select_last(SHIFT_KEY, true);
	return rcube_event.cancel(e);
	}
	break;

	case 27: // Esc
	if (this.drag_active)
	return this.drag_mouse_up(e);

	if (this.col_drag_active) {
	this.selected_column = null;
	return this.column_drag_mouse_up(e);
	}

	return rcube_event.cancel(e);

	case 9: // Tab
	this.blur();
	break;

	case 13: // Enter
	if (!this.selection.length)
	this.select_row(this.last_selected, mod_key, false);

	default:
	this.key_pressed = keyCode;
	this.modkey = mod_key;
	this.triggerEvent('keypress');
	this.modkey = 0;

	if (this.key_pressed == this.BACKSPACE_KEY)
	return rcube_event.cancel(e);
	}

	return true;
	},


	/**
	* Special handling method for arrow keys
	*/
	use_arrow_key: function(keyCode, mod_key)
	{
	var new_row, selected_row = this.rows[this.last_selected];

	if (!selected_row) {
	// select the first row if none selected yet
	this.select_first(CONTROL_KEY);
	}
	// Safari uses the non-standard keycodes 63232/63233 for up/down, if we're
	// using the keypress event (but not the keydown or keyup event).
	else if (keyCode == 40 \|\| keyCode == 63233) // Down arrow
	new_row = this.get_next_row();
	else if (keyCode == 38 \|\| keyCode == 63232) // Up arrow
	new_row = this.get_prev_row();
	else if (keyCode == 39 && selected_row.has_children) { // Right arrow
	if (!selected_row.expanded)
	this.expand_all(selected_row);
	else {
	// jump to the first child
	new_row = this.get_next_row();
	mod_key = null;
	}
	}
	else if (keyCode == 37) { // Left arrow
	if (selected_row.expanded && selected_row.has_children && (!selected_row.parent_uid \|\| !this.multiexpand))
	this.collapse_all(selected_row);
	else if (selected_row.parent_uid) {
	// jump to the top-most or closest parent
	if (mod_key == CONTROL_KEY)
	new_row = this.rows[this.find_root(selected_row.uid)];
	else
	new_row = this.rows[selected_row.parent_uid];

	mod_key = null;
	}
	}

	if (new_row) {
	// simulate ctr-key if no rows are selected
	if (!mod_key && !this.selection.length)
	mod_key = CONTROL_KEY;

	this.select_row(new_row.uid, mod_key, false);
	this.scrollto(new_row.uid);
	}

	return false;
	},


	/**
	* Try to scroll the list to make the specified row visible
	*/
	scrollto: function(id)
	{
	var row = this.rows[id] ? this.rows[id].obj : null;

	if (row && this.frame) {
	var scroll_to = Number(row.offsetTop),
	head_offset = 0;

	// expand thread if target row is hidden (collapsed)
	if (!scroll_to && this.rows[id].parent_uid) {
	var parent = this.find_root(this.rows[id].uid);
	this.expand_all(this.rows[parent]);
	scroll_to = Number(row.offsetTop);
	}

	if (this.fixed_header)
	head_offset = Number(this.thead.offsetHeight);

	// if row is above the frame (or behind header)
	if (scroll_to < Number(this.frame.scrollTop) + head_offset) {
	// scroll window so that row isn't behind header
	this.frame.scrollTop = scroll_to - head_offset;
	}
	else if (scroll_to + Number(row.offsetHeight) > Number(this.frame.scrollTop) + Number(this.frame.offsetHeight))
	this.frame.scrollTop = (scroll_to + Number(row.offsetHeight)) - Number(this.frame.offsetHeight);
	}
	},


	/**
	* Handler for mouse move events
	*/
	drag_mouse_move: function(e)
	{
	// convert touch event
	if (e.type == 'touchmove') {
	if (e.touches.length == 1 && e.changedTouches.length == 1)
	e = rcube_event.touchevent(e.changedTouches[0]);
	else
	return rcube_event.cancel(e);
	}

	if (this.drag_start) {
	// check mouse movement, of less than 3 pixels, don't start dragging
	var m = rcube_event.get_mouse_pos(e),
	limit = 10, selection = [], self = this;

	if (!this.drag_mouse_start \|\| (Math.abs(m.x - this.drag_mouse_start.x) < 3 && Math.abs(m.y - this.drag_mouse_start.y) < 3))
	return false;

	// remember dragging start position
	this.drag_start_pos = {left: m.x, top: m.y};

	// initialize drag layer
	if (!this.draglayer)
	this.draglayer = $('<div>').attr('id', 'rcmdraglayer')
	.css({position: 'absolute', display: 'none', 'z-index': 2000})
	.appendTo(document.body);
	else
	this.draglayer.html('');

	// get selected rows (in display order), don't use this.selection here
	$(this.row_tagname() + '.selected', this.tbody).each(function() {
	var uid = self.get_row_uid(this), row = self.rows[uid];

	if (!row \|\| $.inArray(uid, selection) > -1)
	return;

	selection.push(uid);

	// also handle children of (collapsed) trees for dragging (they might be not selected)
	if (row.has_children && !row.expanded)
	$.each(self.row_children(uid), function() {
	if ($.inArray(this, selection) > -1)
	return;
	selection.push(this);
	});

	// break the loop asap
	if (selection.length > limit + 1)
	return false;
	});

	var row, subject,
	subject_col = self.subject_column(),
	subject_func = function(cell) {
	if (cell) {
	// remove elements marked with "skip-on-drag" class
	cell = $(cell).clone();
	$(cell).find('.skip-on-drag').remove();
	}
	return cell ? cell.text() : '';
	};

	// append subject (of every row up to the limit) to the drag layer
	$.each(selection, function(i, uid) {
	if (i > limit) {
	self.draglayer.append($('<div>').text('...'));
	return false;
	}

	row = self.rows[uid].obj;
	subject = '';

	$(row).children(self.col_tagname()).each(function(n, cell) {
	if (subject_col < 0 \|\| (subject_col >= 0 && subject_col == n)) {
	if (subject = subject_func(cell)) {
	return false;
	}
	}
	});

	// Subject column might be wrong, fallback to .subject
	if (!subject.length) {
	subject = subject_func($(row).children('.subject').first());
	}

	if (subject.length) {
	// remove leading spaces
	subject = subject.trim();
	// truncate line to 50 characters
	subject = (subject.length > 50 ? subject.substring(0, 50) + '...' : subject);

	self.draglayer.append($('<div>').text(subject));
	}
	});

	this.draglayer.show();
	this.drag_active = true;
	this.triggerEvent('dragstart');
	}

	if (this.drag_active && this.draglayer) {
	var pos = rcube_event.get_mouse_pos(e);
	this.draglayer.css({ left:(pos.x+20)+'px', top:(pos.y-5 + (bw.ie ? document.documentElement.scrollTop : 0))+'px' });
	this.triggerEvent('dragmove', e?e:window.event);
	}

	this.drag_start = false;

	return false;
	},


	/**
	* Handler for mouse up events
	*/
	drag_mouse_up: function(e)
	{
	document.onmousemove = null;

	if (e.type == 'touchend') {
	if (e.changedTouches.length != 1)
	return rcube_event.cancel(e);
	}

	if (this.draglayer && this.draglayer.is(':visible')) {
	if (this.drag_start_pos)
	this.draglayer.animate(this.drag_start_pos, 300, 'swing').hide(20);
	else
	this.draglayer.hide();
	}

	if (this.drag_active)
	this.focus();
	this.drag_active = false;

	rcube_event.remove_listener({event:'mousemove', object:this, method:'drag_mouse_move'});
	rcube_event.remove_listener({event:'mouseup', object:this, method:'drag_mouse_up'});

	if (bw.touch) {
	rcube_event.remove_listener({event:'touchmove', object:this, method:'drag_mouse_move'});
	rcube_event.remove_listener({event:'touchend', object:this, method:'drag_mouse_up'});
	}

	// remove temp divs
	this.del_dragfix();

	this.triggerEvent('dragend', e);

	return rcube_event.cancel(e);
	},


	/**
	* Handler for mouse move events for dragging list column
	*/
	column_drag_mouse_move: function(e)
	{
	if (this.drag_start) {
	// check mouse movement, of less than 3 pixels, don't start dragging
	var i, m = rcube_event.get_mouse_pos(e);

	if (!this.drag_mouse_start \|\| (Math.abs(m.x - this.drag_mouse_start.x) < 3 && Math.abs(m.y - this.drag_mouse_start.y) < 3))
	return false;

	if (!this.col_draglayer) {
	var lpos = $(this.list).offset(),
	cells = this.thead.rows[0].cells;

	// fix layer position when list is scrolled
	lpos.top += this.list.scrollTop + this.list.parentNode.scrollTop;

	// create dragging layer
	this.col_draglayer = $('<div>').attr('id', 'rcmcoldraglayer')
	.css(lpos).css({ position:'absolute', 'z-index':2001,
	'background-color':'white', opacity:0.75,
	height: (this.frame.offsetHeight-2)+'px', width: (this.frame.offsetWidth-2)+'px' })
	.appendTo(document.body)
	// ... and column position indicator
	.append($('<div>').attr('id', 'rcmcolumnindicator')
	.css({ position:'absolute', 'border-right':'2px dotted #555',
	'z-index':2002, height: (this.frame.offsetHeight-2)+'px' }));

	this.cols = [];
	this.list_pos = this.list_min_pos = lpos.left;
	// save columns positions
	for (i=0; i<cells.length; i++) {
	this.cols[i] = cells[i].offsetWidth;
	if (this.column_fixed !== null && i <= this.column_fixed) {
	this.list_min_pos += this.cols[i];
	}
	}
	}

	this.col_draglayer.show();
	this.col_drag_active = true;
	this.triggerEvent('column_dragstart');
	}

	// set column indicator position
	if (this.col_drag_active && this.col_draglayer) {
	var i, cpos = 0, pos = rcube_event.get_mouse_pos(e);

	for (i=0; i<this.cols.length; i++) {
	if (pos.x >= this.cols[i]/2 + this.list_pos + cpos)
	cpos += this.cols[i];
	else
	break;
	}

	// handle fixed columns on left
	if (i == 0 && this.list_min_pos > pos.x)
	cpos = this.list_min_pos - this.list_pos;
	// empty list needs some assignment
	else if (!this.list.rowcount && i == this.cols.length)
	cpos -= 2;
	$('#rcmcolumnindicator').css({ width: cpos+'px'});
	this.triggerEvent('column_dragmove', e?e:window.event);
	}

	this.drag_start = false;

	return false;
	},


	/**
	* Handler for mouse up events for dragging list columns
	*/
	column_drag_mouse_up: function(e)
	{
	document.onmousemove = null;

	if (this.col_draglayer) {
	(this.col_draglayer).remove();
	this.col_draglayer = null;
	}

	rcube_event.remove_listener({event:'mousemove', object:this, method:'column_drag_mouse_move'});
	rcube_event.remove_listener({event:'mouseup', object:this, method:'column_drag_mouse_up'});

	// remove temp divs
	this.del_dragfix();

	if (this.col_drag_active) {
	this.col_drag_active = false;
	this.focus();
	this.triggerEvent('column_dragend', e);

	if (this.selected_column !== null && this.cols && this.cols.length) {
	var i, cpos = 0, pos = rcube_event.get_mouse_pos(e);

	// find destination position
	for (i=0; i<this.cols.length; i++) {
	if (pos.x >= this.cols[i]/2 + this.list_pos + cpos)
	cpos += this.cols[i];
	else
	break;
	}

	if (i != this.selected_column && i != this.selected_column+1) {
	this.column_replace(this.selected_column, i);
	}
	}
	}

	return rcube_event.cancel(e);
	},


	/**
	* Returns IDs of all rows in a thread (except root) for specified root
	*/
	row_children: function(uid)
	{
	if (!this.rows[uid] \|\| !this.rows[uid].has_children)
	return [];

	var res = [], depth = this.rows[uid].depth,
	row = this.rows[uid].obj.nextSibling;

	while (row) {
	if (row.nodeType == 1) {
	if (r = this.rows[row.uid]) {
	if (!r.depth \|\| r.depth <= depth)
	break;
	res.push(r.uid);
	}
	}
	row = row.nextSibling;
	}

	return res;
	},


	/**
	* Creates a layer for drag&drop over iframes
	*/
	add_dragfix: function()
	{
	$('iframe').each(function() {
	$('<div class="iframe-dragdrop-fix"></div>')
	.css({background: '#fff',
	width: this.offsetWidth+'px', height: this.offsetHeight+'px',
	position: 'absolute', opacity: '0.001', zIndex: 1000
	})
	.css($(this).offset())
	.appendTo(document.body);
	});
	},


	/**
	* Removes the layer for drag&drop over iframes
	*/
	del_dragfix: function()
	{
	$('div.iframe-dragdrop-fix').remove();
	},


	/**
	* Replaces two columns
	*/
	column_replace: function(from, to)
	{
	// only supported for <table> lists
	if (!this.thead \|\| !this.thead.rows)
	return;

	var len, cells = this.thead.rows[0].cells,
	elem = cells[from],
	before = cells[to],
	td = document.createElement('td');

	// replace header cells
	if (before)
	cells[0].parentNode.insertBefore(td, before);
	else
	cells[0].parentNode.appendChild(td);
	cells[0].parentNode.replaceChild(elem, td);

	// replace list cells
	for (r=0, len=this.tbody.rows.length; r<len; r++) {
	row = this.tbody.rows[r];

	elem = row.cells[from];
	before = row.cells[to];
	td = document.createElement('td');

	if (before)
	row.insertBefore(td, before);
	else
	row.appendChild(td);
	row.replaceChild(elem, td);
	}

	// update subject column position
	if (this.subject_col == from)
	this.subject_col = to > from ? to - 1 : to;
	else if (this.subject_col < from && to <= this.subject_col)
	this.subject_col++;
	else if (this.subject_col > from && to >= this.subject_col)
	this.subject_col--;

	if (this.fixed_header)
	this.init_header();

	this.triggerEvent('column_replace');
	},

	subject_column: function()
	{
	return this.subject_col + (this.checkbox_selection ? 1 : 0);
	}

	};

	rcube_list_widget.prototype.addEventListener = rcube_event_engine.prototype.addEventListener;
	rcube_list_widget.prototype.removeEventListener = rcube_event_engine.prototype.removeEventListener;
	rcube_list_widget.prototype.triggerEvent = rcube_event_engine.prototype.triggerEvent;

	// static
	rcube_list_widget._instances = [];

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