list view databinding helper

callLog.js

exports.populateCallLog = function(listview, items) {
	var helper = require('listViewHelper');

	return helper.populate(listview, items, false /*no merge*/, function sectionGenerator(lv, items) {
		var moment = require("alloy/moment");
		var headerViewCtrl = Alloy.createController('modules/call/log/pickerSectionHeaderView');			
		
		var dateTitle,
		    item = items[0],
		    utcTime = new Date(),
		    timeZone = utcTime.getTimezoneOffset(),
		    datetime = moment(item.properties.timestamp);

		var dayDiff = moment().diff(datetime, 'hours');
		if (dayDiff <= 24) {
			dateTitle = L("Today");
		} else if (dayDiff > 24 && dayDiff <= 24*2) {
			dateTitle = L("Yesterday");
		} else {
			dateTitle = datetime.zone(timeZone).format('L');
		}

		headerViewCtrl.updateViews({
			"#dateTitle" : {
				text : dateTitle
			}
		});

		section = Ti.UI.createListSection({
			headerView : headerViewCtrl.getView(),
			footerView: Alloy.createController('modules/call/log/pickerSectionFooterView').getView()
		});
		headerViewCtrl = null;
		return section;
	}, null, function sortItemIteratee(value) {
		return -value.properties.timestamp;
	}, null);
};

listViewHelper.js

exports.populate = function(listview, items, merge,
	sectionGenerator, groupByIteratee, sortItemsIteratee, sortSectionsIteratee) {
	if (!_.isFunction(sortItemsIteratee)) {
		sortItemsIteratee = function defaultSortItemsIteratee(value) {
			 return -parseInt(value.properties.itemId);			
		};
	}
	
	if (!_.isFunction(sortSectionsIteratee)) {
		sortSectionsIteratee = function defaultSortSectionsIteratee(value) {
			return -parseInt(value.__groupKey);			
		};
	}
	
	if (!_.isFunction(groupByIteratee)) {
		groupByIteratee = function defaultGroupByIteratee(item) {
			return item.properties.groupKey;
		};
	}
	
	var sections = _.chain(items).groupBy(groupByIteratee).pairs().map(function(pairs) {		
		var section;
		var items = pairs[1], groupKey = pairs[0];
		
		if(merge) {
			section = _.findWhere(listview.sections, {
				__groupKey : groupKey
			});
			if (section) {				
				var newItems = section.items.concat(items);	
				newItems = _.sortBy(newItems, sortItemsIteratee);	
				section.items = newItems;
			} else {				
				section = sectionGenerator(listview, items);			
				section.__groupKey = groupKey;
				section.setItems(_.sortBy(items, sortItemsIteratee));
	
				var appendSection,
				    insertAtIndex;
				if (!listview.sections.length) {
					appendSection = true;
				} else {
					// определим куда надо вставить секцию				
					var tmpSections = _.clone(listview.sections);
					tmpSections.push(section);
					
					var keys = _.chain(tmpSections)
						.sortBy(sortSectionsIteratee)
						.map(_.property('__groupKey'))
						.value();
						
					tmpSections = null;
					
					insertAtIndex = keys.indexOf(section.__groupKey);
					appendSection = keys[keys.length - 1] == section.__groupKey;
				}
	
				if (appendSection) {
					listview.appendSection(section);
				} else {
					listview.insertSectionAt(insertAtIndex, section);
				}
			}
		} else {			
			section = sectionGenerator(listview, items);			
			section.__groupKey = groupKey;
			section.setItems(items);
			return section;				
		}
	}).value();
	
	if(!merge) {
		Ti.API.info('>>> sections', sections.length);
		listview.sections = sections;
	}
};