lib/view/pages/timetable/appointmenetComponent.dart

@@ -30,7 +30,7 @@ class _AppointmentComponentState extends State<AppointmentComponent> {
               decoration: BoxDecoration(
                 shape: BoxShape.rectangle,
                 borderRadius: const BorderRadius.all(Radius.circular(5)),
-                color: meeting.color,
+                color: meeting.color.withAlpha(meeting.endTime.isBefore(DateTime.now()) ? 100 : 255),
               ),
               child: SingleChildScrollView(
                 child: Column(

lib/view/pages/timetable/timetable.dart

@@ -157,8 +157,8 @@ class _TimetableState extends State<Timetable> {
 
                 timeRegionBuilder: (BuildContext context, TimeRegionDetails timeRegionDetails) => TimeRegionComponent(details: timeRegionDetails),
                 appointmentBuilder: (BuildContext context, CalendarAppointmentDetails details) => AppointmentComponent(
-                    details: details,
-                    crossedOut: _isCrossedOut(details)
+                  details: details,
+                  crossedOut: _isCrossedOut(details)
                 ),
 
                 headerHeight: 0,
@@ -333,7 +333,7 @@ class _TimetableState extends State<Timetable> {
           subject: 'Änderung',
           notes: element.info,
           location: 'Unbekannt',
-          color: const Color(0xff404040).withAlpha(endTime.isBefore(DateTime.now()) ? 100 : 255),
+          color: const Color(0xff404040),
           startTimeZone: '',
           endTimeZone: '',
         );
@@ -361,26 +361,23 @@ class _TimetableState extends State<Timetable> {
   }
 
   Color _getEventColor(GetTimetableResponseObject webuntisElement, DateTime startTime, DateTime endTime) {
-    // Make element darker, when it already took place
-    var alpha = endTime.isBefore(DateTime.now()) ? 100 : 255;
-
     // Cancelled
-    if(webuntisElement.code == 'cancelled') return const Color(0xff000000).withAlpha(alpha);
+    if(webuntisElement.code == 'cancelled') return const Color(0xff000000);
 
     // Any changes or no teacher at this element
-    if(webuntisElement.code == 'irregular' || webuntisElement.te.first.id == 0) return const Color(0xff8F19B3).withAlpha(alpha);
+    if(webuntisElement.code == 'irregular' || webuntisElement.te.first.id == 0) return const Color(0xff8F19B3);
 
     // Teacher has changed
-    if(webuntisElement.te.any((element) => element.orgname != null)) return const Color(0xFF29639B).withAlpha(alpha);
+    if(webuntisElement.te.any((element) => element.orgname != null)) return const Color(0xFF29639B);
 
     // Event was in the past
-    if(endTime.isBefore(DateTime.now())) return Theme.of(context).primaryColor.withAlpha(alpha);
+    if(endTime.isBefore(DateTime.now())) return Theme.of(context).primaryColor;
 
     // Event takes currently place
     if(endTime.isAfter(DateTime.now()) && startTime.isBefore(DateTime.now())) return Theme.of(context).primaryColor.withRed(200);
 
     // Fallback
-    return Theme.of(context).primaryColor.withAlpha(alpha);
+    return Theme.of(context).primaryColor;
   }
 
   bool _isCrossedOut(CalendarAppointmentDetails calendarEntry) {