Support timezone and hour limitation

lib/src/components/_internal_components.dart

@@ -37,15 +37,19 @@ class LiveTimeIndicator extends StatefulWidget {
   /// Defines height occupied by one minute.
   final double heightPerMinute;
 
+  // Start time to display
+  final TimeOfDay? startTime;
+
   /// Widget to display tile line according to current time.
-  const LiveTimeIndicator(
-      {Key? key,
-      required this.width,
-      required this.height,
-      required this.timeLineWidth,
-      required this.liveTimeIndicatorSettings,
-      required this.heightPerMinute})
-      : super(key: key);
+  const LiveTimeIndicator({
+    Key? key,
+    required this.width,
+    required this.height,
+    required this.timeLineWidth,
+    required this.liveTimeIndicatorSettings,
+    required this.heightPerMinute,
+    this.startTime,
+  }) : super(key: key);
 
   @override
   _LiveTimeIndicatorState createState() => _LiveTimeIndicatorState();
@@ -81,14 +85,20 @@ class _LiveTimeIndicatorState extends State<LiveTimeIndicator> {
 
   @override
   Widget build(BuildContext context) {
+    int currentMinutes = _currentTime.getTotalMinutes;
+
+    if (widget.startTime != null) {
+      currentMinutes -= widget.startTime!.getTotalMinutes;
+    }
+
     return CustomPaint(
       size: Size(widget.width, widget.height),
       painter: CurrentTimeLinePainter(
         color: widget.liveTimeIndicatorSettings.color,
         height: widget.liveTimeIndicatorSettings.height,
         offset: Offset(
           widget.timeLineWidth + widget.liveTimeIndicatorSettings.offset,
-          _currentTime.getTotalMinutes * widget.heightPerMinute,
+          currentMinutes * widget.heightPerMinute,
         ),
       ),
     );
@@ -148,7 +158,7 @@ class TimeLine extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    int? initialHour = startTime != null ? startTime!.hour : 1;
+    int? initialHour = startTime != null ? startTime!.hour : 0;
     int? hoursADay = endTime != null ? endTime!.hour : Constants.hoursADay;
     int totalHours = hoursADay - initialHour;
     return ConstrainedBox(
@@ -289,6 +299,7 @@ class EventGenerator<T extends Object?> extends StatelessWidget {
       heightPerMinute: heightPerMinute,
     );
 
+// position tile
     return List.generate(events.length, (index) {
       return Positioned(
         top: events[index].top,

lib/src/day_view/_internal_day_view_page.dart

@@ -271,6 +271,7 @@ class InternalDayViewPage<T extends Object?> extends StatelessWidget {
                           height: height,
                           heightPerMinute: heightPerMinute,
                           timeLineWidth: timeLineWidth,
+                          startTime: startTime,
                         ),
                       ),
                   ],

lib/src/day_view/day_view.dart

@@ -17,6 +17,7 @@ import '../enumerations.dart';
 import '../event_arrangers/event_arrangers.dart';
 import '../event_controller.dart';
 import '../extensions.dart';
+import '../helpers/time_zone.dart';
 import '../modals.dart';
 import '../painters.dart';
 import '../style/header_style.dart';
@@ -333,10 +334,18 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
 
   final _scrollConfiguration = EventScrollConfiguration<T>();
 
+  late TimeOfDay? startTime;
+
+  late TimeOfDay? endTime;
+
+  int timeZoneOffset = 0;
+
   @override
   void initState() {
     super.initState();
 
+    _updateTimeToCurrentTimeZone();
+
     _reloadCallback = _reload;
     _setDateRange();
 
@@ -349,10 +358,29 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
         initialScrollOffset: widget.scrollOffset ??
             widget.startDuration.inMinutes * widget.heightPerMinute);
     _pageController = PageController(initialPage: _currentIndex);
-    _eventArranger = widget.eventArranger ?? SideEventArranger<T>();
+    _eventArranger = widget.eventArranger ??
+        SideEventArranger<T>(startTime: widget.startTime);
     _assignBuilders();
   }
 
+  void _updateTimeToCurrentTimeZone() {
+    final int currentTimeZoneOffset = widget.locationName != null
+        ? TimeZoneHelper.getTimeZoneOffset(widget.locationName!)
+        : 0;
+    final TimeOfDay? finalStartTime = widget.startTime != null
+        ? TimeZoneHelper.addHour(widget.startTime!, currentTimeZoneOffset)
+        : null;
+    final TimeOfDay? finalEndTime = widget.endTime != null
+        ? TimeZoneHelper.addHour(widget.endTime!, currentTimeZoneOffset)
+        : null;
+
+    setState(() {
+      timeZoneOffset = currentTimeZoneOffset;
+      startTime = finalStartTime;
+      endTime = finalEndTime;
+    });
+  }
+
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
@@ -376,6 +404,9 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
   @override
   void didUpdateWidget(DayView<T> oldWidget) {
     super.didUpdateWidget(oldWidget);
+
+    _updateTimeToCurrentTimeZone();
+
     // Update controller.
     final newController = widget.controller ??
         CalendarControllerProvider.of<T>(context).controller;
@@ -395,7 +426,8 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
       _pageController.jumpToPage(_currentIndex);
     }
 
-    _eventArranger = widget.eventArranger ?? SideEventArranger<T>();
+    _eventArranger = widget.eventArranger ??
+        SideEventArranger<T>(startTime: widget.startTime);
 
     // Update heights.
     _calculateHeights();
@@ -479,8 +511,8 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
                             emulateVerticalOffsetBy:
                                 widget.emulateVerticalOffsetBy,
                             locationName: widget.locationName,
-                            startTime: widget.startTime,
-                            endTime: widget.endTime,
+                            startTime: startTime,
+                            endTime: endTime,
                           ),
                         );
                       },
@@ -639,7 +671,7 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
     required MinuteSlotSize minuteSlotSize,
   }) {
     int hoursADay = _getHoursADay().toInt();
-    int startHour = widget.startTime != null ? widget.startTime!.hour : 0;
+    int startHour = startTime != null ? startTime!.hour : 0;
 
     final heightPerSlot = minuteSlotSize.minutes * heightPerMinute;
     final slots = (hoursADay * 60) ~/ minuteSlotSize.minutes;

lib/src/event_arrangers/event_arrangers.dart

@@ -5,6 +5,7 @@
 import 'dart:math' as math;
 
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
 
 import '../calendar_event_data.dart';
 import '../constants.dart';

lib/src/event_arrangers/merge_event_arranger.dart

@@ -10,6 +10,7 @@ class MergeEventArranger<T extends Object?> extends EventArranger<T> {
   /// [OrganizedCalendarEventData.events] will gives
   /// list of all the combined events.
   const MergeEventArranger({
+    this.startTime,
     this.includeEdges = true,
   });
 
@@ -21,6 +22,9 @@ class MergeEventArranger<T extends Object?> extends EventArranger<T> {
   ///
   final bool includeEdges;
 
+  // Start time to display
+  final TimeOfDay? startTime;
+
   /// {@macro event_arranger_arrange_method_doc}
   ///
   /// Make sure that all the events that are passed in [events], must be in
@@ -37,6 +41,13 @@ class MergeEventArranger<T extends Object?> extends EventArranger<T> {
     //
     final arrangedEvents = <OrganizedCalendarEventData<T>>[];
 
+    int startMinutes = 0;
+
+    if (startTime != null) {
+      // Subtract start time to calculate correct tile position
+      startMinutes = startTime!.getTotalMinutes * -1;
+    }
+
     for (final event in events) {
       // Checks if an event has valid start and end time.
       if (event.startTime == null ||
@@ -62,10 +73,10 @@ class MergeEventArranger<T extends Object?> extends EventArranger<T> {
       final startTime = event.startTime!;
       final endTime = event.endTime!;
 
-      final eventStart = startTime.getTotalMinutes;
+      final eventStart = startTime.getTotalMinutes + startMinutes;
       final eventEnd = endTime.getTotalMinutes == 0
           ? Constants.minutesADay
-          : endTime.getTotalMinutes;
+          : endTime.getTotalMinutes + startMinutes;
 
       final arrangeEventLen = arrangedEvents.length;
 

lib/src/event_arrangers/side_event_arranger.dart

@@ -8,6 +8,7 @@ class SideEventArranger<T extends Object?> extends EventArranger<T> {
   /// This class will provide method that will arrange
   /// all the events side by side.
   const SideEventArranger({
+    this.startTime,
     this.includeEdges = false,
   });
 
@@ -19,6 +20,9 @@ class SideEventArranger<T extends Object?> extends EventArranger<T> {
   ///
   final bool includeEdges;
 
+  // Start time to display
+  final TimeOfDay? startTime;
+
   /// {@macro event_arranger_arrange_method_doc}
   ///
   /// Make sure that all the events that are passed in [events], must be in
@@ -30,9 +34,9 @@ class SideEventArranger<T extends Object?> extends EventArranger<T> {
     required double width,
     required double heightPerMinute,
   }) {
-    final mergedEvents = MergeEventArranger<T>(
-      includeEdges: includeEdges,
-    ).arrange(
+    final mergedEvents =
+        MergeEventArranger<T>(includeEdges: includeEdges, startTime: startTime)
+            .arrange(
       events: events,
       height: height,
       width: width,
@@ -83,6 +87,13 @@ class SideEventArranger<T extends Object?> extends EventArranger<T> {
 
       final slotWidth = width / column;
 
+      int startMinutes = 0;
+
+      if (startTime != null) {
+        // Subtract start time to calculate correct tile position
+        startMinutes = startTime!.getTotalMinutes * -1;
+      }
+
       for (final sideEvent in sideEventData) {
         if (sideEvent.event.startTime == null ||
             sideEvent.event.endTime == null) {
@@ -103,12 +114,13 @@ class SideEventArranger<T extends Object?> extends EventArranger<T> {
         final bottom = height -
             (endTime.getTotalMinutes == 0
                     ? Constants.minutesADay
-                    : endTime.getTotalMinutes) *
+                    : endTime.getTotalMinutes + startMinutes) *
                 heightPerMinute;
+        // ou ici
         arrangedEvents.add(OrganizedCalendarEventData<T>(
           left: slotWidth * (sideEvent.column - 1),
           right: slotWidth * (column - sideEvent.column),
-          top: startTime.getTotalMinutes * heightPerMinute,
+          top: (startTime.getTotalMinutes + startMinutes) * heightPerMinute,
           bottom: bottom,
           startDuration: startTime,
           endDuration: endTime,

lib/src/helpers/time_zone.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+import 'package:timezone/standalone.dart' as tz;
+import 'package:timezone/timezone.dart';
+
+class TimeZoneHelper {
+  static DateTime? getTzDateFromDateTime(
+      DateTime? dateTime, String locationName) {
+    if (dateTime == null) {
+      return null;
+    }
+    final Location location = tz.getLocation(locationName);
+    return TZDateTime.from(dateTime, location);
+  }
+
+  static int getTimeZoneOffset(String location) {
+    final now = DateTime.now();
+    return now.timeZoneOffset.inHours -
+        getTzDateFromDateTime(now, location)!.timeZoneOffset.inHours;
+  }
+
+  static TimeOfDay addHour(TimeOfDay time, int hour) {
+    return TimeOfDay(hour: time.hour + hour, minute: time.minute);
+  }
+}

lib/src/week_view/_internal_week_view_page.dart

@@ -308,6 +308,7 @@ class InternalWeekViewPage<T extends Object?> extends StatelessWidget {
                         height: height,
                         heightPerMinute: heightPerMinute,
                         timeLineWidth: timeLineWidth,
+                        startTime: startTime,
                       ),
                     Align(
                       alignment: Alignment.centerRight,