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Diffstat (limited to 'program/js/treelist.js')
| -rw-r--r-- | program/js/treelist.js | 425 |
1 files changed, 425 insertions, 0 deletions
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') + '"> </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; |