From 3c309af0663f1673f921682c6ae3f673426e1397 Mon Sep 17 00:00:00 2001
From: Thomas Bruederli <thomas@roundcube.net>
Date: Thu, 31 Jan 2013 13:49:35 +0100
Subject: - Refactored the hierarchical mailboxlist control into a separate
 widget class - Build address book directories list as hierarchical list -
 Make address book groups collapsible using the new new treelist widget - Use
 encoded identifiers for address book directory list items

---
 program/js/treelist.js | 425 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 425 insertions(+)
 create mode 100644 program/js/treelist.js

(limited to 'program/js/treelist.js')

diff --git a/program/js/treelist.js b/program/js/treelist.js
new file mode 100644
index 000000000..47ac0c1a0
--- /dev/null
+++ b/program/js/treelist.js
@@ -0,0 +1,425 @@
+/*
+ +-----------------------------------------------------------------------+
+ | Roundcube Treelist widget                                             |
+ |                                                                       |
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) 2013, The Roundcube Dev Team                            |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ +-----------------------------------------------------------------------+
+ | Authors: Thomas Bruederli <roundcube@gmail.com>                       |
+ +-----------------------------------------------------------------------+
+ | Requires: common.js                                                   |
+ +-----------------------------------------------------------------------+
+*/
+
+
+/**
+ * Roundcube Treelist widget class
+ * @contructor
+ */
+function rcube_treelist_widget(node, p)
+{
+	// apply some defaults to p
+	p = $.extend({
+		id_prefix: '',
+		autoexpand: 1000,
+		selectable: false,
+		check_droptarget: function(node){ return !node.virtual }
+	}, p || {});
+
+	var container = $(node);
+	var data = p.data || [];
+	var indexbyid = {};
+	var selection = null;
+	var drag_active = false;
+	var box_coords = {};
+	var item_coords = [];
+	var autoexpand_timer;
+	var autoexpand_item;
+	var body_scroll_top = 0;
+	var list_scroll_top = 0;
+	var me = this;
+
+
+	/////// export public members and methods
+
+	this.container = container;
+	this.expand = expand;
+	this.collapse = collapse;
+	this.select = select;
+	this.render = render;
+	this.drag_start = drag_start;
+	this.drag_end = drag_end;
+	this.intersects = intersects;
+
+
+	/////// startup code (constructor)
+
+	// abort if node not found
+	if (!container.length)
+		return;
+
+	if (p.data) {
+		index_data({ children:data });
+	}
+	// load data from DOM
+	else {
+		data = walk_list(container);
+		// console.log(data);
+	}
+
+	// register click handlers on list
+	container.on('click', 'div.treetoggle', function(e){
+		toggle(dom2id($(this).parent()));
+	});
+
+	container.on('click', 'li', function(e){
+		var node = p.selectable ? indexbyid[dom2id($(this))] : null;
+		if (node && !node.virtual) {
+			select(node.id);
+			e.stopPropagation();
+		}
+	});
+
+
+	/////// private methods
+
+	/**
+	 * Collaps a the node with the given ID
+	 */
+	function collapse(id, recursive, set)
+	{
+		var node;
+		if (node = indexbyid[id]) {
+			node.collapsed = typeof set == 'undefined' || set;
+			update_dom(node);
+
+			// Work around a bug in IE6 and IE7, see #1485309
+			if (window.bw && (bw.ie6 || bw.ie7) && node.collapsed) {
+				id2dom(node.id).next().children('ul:visible').hide().show();
+			}
+
+			if (recursive && node.children) {
+				for (var i=0; i < node.children.length; i++) {
+					collapse(node.children[i].id, recursive, set);
+				}
+			}
+
+			me.triggerEvent(node.collapsed ? 'collapse' : 'expand', node);
+		}
+	}
+
+	/**
+	 * Expand a the node with the given ID
+	 */
+	function expand(id, recursive)
+	{
+		collapse(id, recursive, false);
+	}
+
+	/**
+	 * Toggle collapsed state of a list node
+	 */
+	function toggle(id, recursive)
+	{
+		var node;
+		if (node = indexbyid[id]) {
+			collapse(id, recursive, !node.collapsed);
+		}
+	}
+
+	/**
+	 * Select a tree node by it's ID
+	 */
+	function select(id)
+	{
+		if (selection) {
+			id2dom(selection).removeClass('selected');
+			selection = null;
+		}
+
+		var li = id2dom(id);
+		if (li.length) {
+			li.addClass('selected');
+			selection = id;
+			// TODO: expand all parent nodes if collapsed
+			scroll_to_node(li);
+		}
+
+		me.triggerEvent('select', indexbyid[id]);
+	}
+
+	/**
+	 * Getter for the currently selected node ID
+	 */
+	function get_selection()
+	{
+		return selection;
+	}
+
+	/**
+	 * Return the DOM element of the list item with the given ID
+	 */
+	function get_item(id)
+	{
+		return id2dom(id).get(0);
+	}
+
+	/**
+	 * Apply the 'collapsed' status of the data node to the corresponding DOM element(s)
+	 */
+	function update_dom(node)
+	{
+		var li = id2dom(node.id);
+		li.children('ul').first()[(node.collapsed ? 'hide' : 'show')]();
+		li.children('div.treetoggle').removeClass('collapsed expanded').addClass(node.collapsed ? 'collapsed' : 'expanded');
+		me.triggerEvent('toggle', node);
+	}
+
+	/**
+	 * Render the tree list from the internal data structure
+	 */
+	function render()
+	{
+		if (me.triggerEvent('renderBefore', data) === false)
+			return;
+
+		// remove all child nodes
+		container.html('');
+
+		// render child nodes
+		for (var i=0; i < data.length; i++) {
+			render_node(data[i], container);
+		}
+
+		me.triggerEvent('renderAfter', container);
+	}
+
+	/**
+	 * Render a specific node into the DOM list
+	 */
+	function render_node(node, parent)
+	{
+		var li = $('<li>' + node.html + '</li>')
+			.attr('id', p.id_prefix + node.id)
+			.addClass((node.classes || []).join(' '))
+			.appendTo(parent);
+
+		if (node.virtual)
+			li.addClass('virtual');
+		if (node.id == selection)
+			li.addClass('selected');
+
+		// add child list and toggle icon
+		if (node.children && node.children.length) {
+			$('<div class="treetoggle '+(node.collapsed ? 'collapsed' : 'expanded') + '">&nbsp;</div>').appendTo(li);
+			var ul = $('<ul>').appendTo(li);
+			if (node.collapsed)
+				ul.hide();
+
+			for (var i=0; i < node.children.length; i++) {
+				render_node(node.children[i], ul);
+			}
+		}
+	}
+
+	/**
+	 * Recursively walk the DOM tree and build an internal data structure
+	 * representing the skeleton of this tree list.
+	 */
+	function walk_list(ul)
+	{
+		var result = [];
+		ul.children('li').each(function(i,e){
+			var li = $(e);
+			var node = {
+				id: dom2id(li),
+				classes: li.attr('class').split(' '),
+				virtual: li.hasClass('virtual'),
+				html: li.children().first().get(0).outerHTML,
+				children: walk_list(li.children('ul'))
+			}
+
+			if (node.children.length) {
+				node.collapsed = li.children('ul').css('display') == 'none';
+			}
+			if (li.hasClass('selected')) {
+				selection = node.id;
+			}
+
+			result.push(node);
+			indexbyid[node.id] = node;
+		})
+
+		return result;
+	}
+
+	/**
+	 * Recursively walk the data tree and index nodes by their ID
+	 */
+	function index_data(node)
+	{
+		if (node.id) {
+			indexbyid[node.id] = node;
+		}
+		for (var c=0; node.children && c < node.children.length; c++) {
+			index_data(node.children[c]);
+		}
+	}
+
+	/**
+	 * Get the (stripped) node ID from the given DOM element
+	 */
+	function dom2id(li)
+	{
+		var domid = li.attr('id').replace(new RegExp('^' + (p.id_prefix) || '%'), '');
+		return p.id_decode ? p.id_decode(domid) : domid;
+	}
+
+	/**
+	 * Get the <li> element for the given node ID
+	 */
+	function id2dom(id)
+	{
+		var domid = p.id_encode ? p.id_encode(id) : id;
+		return $('#' + p.id_prefix + domid);
+	}
+
+	/**
+	 * Scroll the parent container to make the given list item visible
+	 */
+	function scroll_to_node(li)
+	{
+		var scroller = container.parent();
+		scroller.scrollTop(li.offset().top - scroller.offset().top + scroller.scrollTop());
+	}
+
+	///// drag & drop support
+
+	/**
+	 * When dragging starts, compute absolute bounding boxes of the list and it's items
+	 * for faster comparisons while mouse is moving
+	 */
+	function drag_start()
+	{
+		var li, item, height,
+			pos = container.offset();
+
+		body_scroll_top = bw.ie ? 0 : window.pageYOffset;
+		list_scroll_top = container.parent().scrollTop();
+
+		drag_active = true;
+		box_coords = {
+			x1: pos.left,
+			y1: pos.top,
+			x2: pos.left + container.width(),
+			y2: pos.top + container.height()
+		};
+
+		item_coords = [];
+		for (var id in indexbyid) {
+			li = id2dom(id);
+			item = li.children().first().get(0);
+			if (height = item.offsetHeight) {
+				pos = $(item).offset();
+				item_coords[id] = {
+					x1: pos.left,
+					y1: pos.top,
+					x2: pos.left + item.offsetWidth,
+					y2: pos.top + height,
+					on: id == autoexpand_item
+				};
+			}
+		}
+	}
+
+	/**
+	 * Signal that dragging has stopped
+	 */
+	function drag_end()
+	{
+		drag_active = false;
+
+		if (autoexpand_timer) {
+			clearTimeout(autoexpand_timer);
+			autoexpand_timer = null;
+			autoexpand_item = null;
+		}
+
+		$('li.droptarget', container).removeClass('droptarget');
+	}
+
+	/**
+	 * Determine if the given mouse coords intersect the list and one if its items
+	 */
+	function intersects(mouse, highlight)
+	{
+		// offsets to compensate for scrolling while dragging a message
+		var boffset = bw.ie ? -document.documentElement.scrollTop : body_scroll_top,
+			moffset = list_scroll_top - container.parent().scrollTop(),
+			result = null;
+
+		mouse.top = mouse.y + -moffset - boffset;
+
+		// no intersection with list bounding box
+		if (mouse.x < box_coords.x1 || mouse.x >= box_coords.x2 || mouse.top < box_coords.y1 || mouse.top >= box_coords.y2) {
+		  // TODO: optimize performance for this operation
+		  $('li.droptarget', container).removeClass('droptarget');
+			return result;
+		}
+
+		// check intersection with visible list items
+		var pos, node;
+		for (var id in item_coords) {
+			pos = item_coords[id];
+			if (mouse.x >= pos.x1 && mouse.x < pos.x2 && mouse.top >= pos.y1 && mouse.top < pos.y2) {
+				node = indexbyid[id];
+
+				// if the folder is collapsed, expand it after the configured time
+				if (node.children && node.children.length && node.collapsed && p.autoexpand && autoexpand_item != id) {
+					if (autoexpand_timer)
+						clearTimeout(autoexpand_timer);
+
+					autoexpand_item = id;
+					autoexpand_timer = setTimeout(function() {
+						expand(autoexpand_item);
+						drag_start();  // re-calculate item coords
+						autoexpand_item = null;
+					}, p.autoexpand);
+				}
+				else if (autoexpand_timer && autoexpand_item != id) {
+					clearTimeout(autoexpand_timer);
+					autoexpand_item = null;
+					autoexpand_timer = null;
+				}
+
+				// check if this item is accepted as drop target
+				if (p.check_droptarget(node)) {
+					if (highlight) {
+						id2dom(id).addClass('droptarget');
+						pos.on = true;
+					}
+					result = id;
+				}
+				else {
+					result = null;
+				}
+			}
+			else if (pos.on) {
+				id2dom(id).removeClass('droptarget');
+				pos.on = false;
+			}
+		}
+
+		return result;
+	}
+}
+
+// use event processing functions from Roundcube's rcube_event_engine
+rcube_treelist_widget.prototype.addEventListener = rcube_event_engine.prototype.addEventListener;
+rcube_treelist_widget.prototype.removeEventListener = rcube_event_engine.prototype.removeEventListener;
+rcube_treelist_widget.prototype.triggerEvent = rcube_event_engine.prototype.triggerEvent;
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