add basic suport for concurrent events (#6)

fr-calendar.css

@@ -116,6 +116,12 @@
 	margin: 5px 3px;
 	display: block;
 }
+.frcal__event.frcal__event_concurrent1 span {
+	width: 50%;
+}
+.frcal__event.frcal__event_concurrent2 {
+	padding-left: 50%;
+}
 
 .frcal__timed_item .frcal__event {
 	position: relative;

main.js

@@ -631,15 +631,42 @@ class CalendarView extends ItemView
 
 		time[0] = time[0].hour()*60 + time[0].minute();
 		time[1] = time[1].hour()*60 + time[1].minute();
+
+		// check for concurrent events
+		let classes = "frcal__event";
+		for (let i in container.children)
+		{
+			let child = container.children[i];
+			if ((child instanceof HTMLElement) && child.hasClass("frcal__event"))
+			{
+				if (
+					   (time[1] > parseInt(child.dataset.start))
+					&& (time[0] < parseInt(child.dataset.end))
+				)
+				{
+					if (time[0] < parseInt(child.dataset.start))
+					{
+						classes += " frcal__event_concurrent1";
+						child.addClass("frcal__event_concurrent2");
+					}
+					else
+					{
+						child.addClass("frcal__event_concurrent1");
+						classes += " frcal__event_concurrent2";
+					}
+				}
+			}
+		}
+
 		let el = container.createEl('div', {
-			cls: 'frcal__event',
+			cls: classes,
-			id: "fr_event_" + event.id,
 			attr: {
+				'id': "fr_event_" + event.id,
 				'data-group': event.group,
 				'data-state': event.state,
 				'data-type': event.type,
 				'data-start': time[0].toString(),
-				'data-duration': (time[1] - time[0]).toString(),
+				'data-end': time[1].toString(),
 				'style': ((allDay) ? '' : 'top:' + (time[0]*this.zoom).toString() + 'px')
 			},
 		});