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Parse calendar in isolates to prevent ui freeze #138

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merged 4 commits into from
Apr 5, 2024
Merged

Parse calendar in isolates to prevent ui freeze #138

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09f47aa
parse events in isolate
Huber1 Apr 5, 2024
796e5a3
show events in range 6 >= this >= -2 month
Huber1 Apr 5, 2024
2cc907d
show events in range 6 >= this >= -2 months
Huber1 Apr 5, 2024
f3a5633
remove print
Huber1 Apr 5, 2024
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17 changes: 15 additions & 2 deletions lib/home/calendar/parse_events.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import 'package:better_hm/home/calendar/calendar_service.dart';
import 'package:better_hm/home/calendar/models/calendar.dart';
import 'package:better_hm/home/calendar/service/ical_sync_service.dart';
import 'package:better_hm/shared/models/event_data.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:icalendar/icalendar.dart';
import 'package:kalender/kalender.dart';
Expand Down Expand Up @@ -41,6 +42,13 @@ Future<Iterable<CustomCalendarEvent>> parseEvents(
Future<Iterable<CustomCalendarEvent>> parseICal(
File file,
Calendar calendar,
) async {
return await compute((_) => _parseICal(file, calendar), null);
}

Future<Iterable<CustomCalendarEvent>> _parseICal(
File file,
Calendar calendar,
) async {
final lines = await file.readAsLines();

Expand Down Expand Up @@ -143,12 +151,17 @@ List<CustomCalendarEvent> splitRRule(CustomCalendarEvent event) {
for (final rule in data.recurrenceRules!) {
final recur = rrule.RecurrenceRule.fromString(rule.toString());
final instances = recur.getInstances(
start: DateTime.now().add(const Duration(days: 365)),
start: DateTime.now()
.subtract(const Duration(days: 60))
.copyWith(isUtc: true),
);

// year before and after today
final ranged = instances.takeWhile(
(value) => value.year.compareTo(DateTime.now().year).abs() < 2,
(value) {
final diff = value.difference(DateTime.now()).inDays;
return diff >= -61 && diff <= 6 * 30;
},
);

for (final instance in ranged) {
Expand Down
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