gistfile1.js

// ==========================================================================
// Project:   DarkHorse - The PC Browser targeted face of the Matygo Web App
// Copyright: ©2010 Matygo Educational Incorporated
// ==========================================================================
/*globals DarkHorse */

/** @class

  (Document Your Controller Here)

  @extends SC.Object
*/
DarkHorse.ScrollListController = SC.TreeController.extend({
	groupKey: '',
	groupCount: 0,
    treeItemIsGrouped: YES,
    treeItemIsExpanded: YES,
    treeItemChildrenKey: 'treeItemChildren',
    treeItemIsExpandedKey: 'treeItemIsExpanded',
	length: 0,

    ContentItem: SC.Object.extend({
        treeItemIsExpanded: YES,
        treeItemIsGrouped: YES,
		isGroupRow: YES,
        title: "Root",
		isEnabled: NO,
		isSelectable: NO,
        treeItemChildren: []
    }),
	
	summary: function() {
	    var len = this.get('length'),
	    ret;
	    if (len && len > 0) {
	        ret = len === 1 ? "1 " +  this._singleName: ("%@ " + this._pluralName).fmt(len);
	    } else ret = "No " + this._pluralName;

	    return ret;
	}.property('length').cacheable(),
	
	arrangedObjects: function() {
		var ret, content = this.get('content');
		content = this.filterContent(content);
		content = this.groupContent(content);
        if (content) {
            ret = SC.TreeItemObserver.create({
                item: content,
                delegate: this
            });
        } else ret = null; // empty!
        this._sctc_arrangedObjects = ret;
		if(ret){
			this.set('length',ret.get('length') - this.get('groupCount'));
		}
        return ret;
    }.property('groupKey','filterFunction').cacheable(),


	filterContent: function(content){
		if(content){
			content = content.filter(this.filterFunction,this);
		}
		return content;
	},

	filterFunction: function(item){
		return YES;
	},

    groupContent: function(content) {
        if (!content) return;
       	var groups = [];
        var courseController = this;
        var groupKey = this.groupKey;

		this.set('groupCount',0);
        content.forEach(function(contentItem) {
            var group, groupName = contentItem.get(groupKey); // get the group we are in
            for (var j = 0; j < groups.length; j++) {
				if (groups[j].get(groupKey) === groupName) {
                    group = groups[j];
                    break;
                }
            }
            if(!group) {
                group = courseController.ContentItem.create({
					treeItemChildren: []
				});
				this.incrementProperty('groupCount');
                group.set(groupKey,groupName);
				group.set('title',groupName);
                groups.push(group);
            }
			contentItem.set('treeItemIsGrouped',YES);
            group.treeItemChildren.push(contentItem);
        },
        this);

        var courseItems = this.ContentItem.create({
			treeItemChildren: groups
		});
        return courseItems;
    }
});