From bf6a574499bebd2f3e23ff27c94e4ba6c87b9628 Mon Sep 17 00:00:00 2001
From: Jaimin Rana <jaimin.r@simformsolutions.com>
Date: Wed, 1 Nov 2023 16:48:54 +0530
Subject: [PATCH] =?UTF-8?q?fix:=20=F0=9F=90=9BDay=20view=20auto=20scroll?=
 =?UTF-8?q?=20to=20initial=20duration=20when=20using=20[scrollOffset]=20&?=
 =?UTF-8?q?=20[startingDuration]=20#269.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 CHANGELOG.md                   |  8 ++++++--
 lib/src/day_view/day_view.dart | 24 ++++++++++++------------
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 543e1f8a..e3180dfd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# [1.0.5] (UnReleased)
+
+- Fixed issue related to auto scroll to initial duration for day
+  view-[#269](https://github.com/SimformSolutionsPvtLtd/flutter_calendar_view/issues/269)
+
 # [1.0.4 - 9 Aug 2023](https://github.com/SimformSolutionsPvtLtd/flutter_calendar_view/tree/1.0.4)
 
 - Fixed
@@ -8,10 +13,9 @@
   Issue [#237 - DayView & MonthView layout issue in landscape mode](https://github.com/SimformSolutionsPvtLtd/flutter_calendar_view/issues/237)
 - Added Feature
   [#57 - Change default start hour in DayView](https://github.com/SimformSolutionsPvtLtd/flutter_calendar_view/issues/57)
-- Fixed 
+- Fixed
   Issue [#225 - Unwanted space at top in DayView while using sliver](https://github.com/SimformSolutionsPvtLtd/flutter_calendar_view/issues/225)
 
-
 # [1.0.3 - 3 Apr 2023](https://github.com/SimformSolutionsPvtLtd/flutter_calendar_view/tree/1.0.3)
 
 - Added
diff --git a/lib/src/day_view/day_view.dart b/lib/src/day_view/day_view.dart
index 73ef9bee..6ae8d333 100644
--- a/lib/src/day_view/day_view.dart
+++ b/lib/src/day_view/day_view.dart
@@ -145,8 +145,12 @@ class DayView<T extends Object?> extends StatefulWidget {
   /// Background colour of day view page.
   final Color? backgroundColor;
 
-  /// Scroll offset of day view page.
-  final double scrollOffset;
+  /// Defines initial offset of first page that will be displayed when
+  /// [DayView] is initialized.
+  ///
+  /// If [scrollOffset] is null then [startDuration] will be considered for
+  /// initial offset.
+  final double? scrollOffset;
 
   /// This method will be called when user taps on event tile.
   final CellTapCallback<T>? onEventTap;
@@ -184,7 +188,7 @@ class DayView<T extends Object?> extends StatefulWidget {
 
   final bool showHalfHours;
 
-  /// Duration from where default day view will be visible
+  /// It define the starting duration from where day view page will be visible
   /// By default it will be Duration(hours:0)
   final Duration startDuration;
 
@@ -214,7 +218,7 @@ class DayView<T extends Object?> extends StatefulWidget {
     this.eventArranger,
     this.verticalLineOffset = 10,
     this.backgroundColor = Colors.white,
-    this.scrollOffset = 0.0,
+    this.scrollOffset,
     this.onEventTap,
     this.onDateLongPress,
     this.onDateTap,
@@ -298,8 +302,9 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
     _regulateCurrentDate();
 
     _calculateHeights();
-    _scrollController =
-        ScrollController(initialScrollOffset: widget.scrollOffset);
+    _scrollController = ScrollController(
+        initialScrollOffset: widget.scrollOffset ??
+            widget.startDuration.inMinutes * widget.heightPerMinute);
     _pageController = PageController(initialPage: _currentIndex);
     _eventArranger = widget.eventArranger ?? SideEventArranger<T>();
     _assignBuilders();
@@ -323,10 +328,6 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
         // user adds new events.
         ..addListener(_reloadCallback);
     }
-
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      animateToDuration(widget.startDuration);
-    });
   }
 
   @override
@@ -799,8 +800,7 @@ class DayViewState<T extends Object?> extends State<DayView<T>> {
     // above 24 hrs then we take it max as 24 hours only
     final offset = offSetForSingleMinute *
         (startDurationInMinutes > 3600 ? 3600 : startDurationInMinutes);
-    debugPrint("offSet $offset");
-    _scrollController.animateTo(
+    animateTo(
       offset.toDouble(),
       duration: duration,
       curve: curve,