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Add built-in horizontal scroll bar to CategoryOverflowCalendarDayView #2

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Merged
maksym-tielnyi-solid merged 2 commits into from
Jul 1, 2026
+65 −29
Merged

Add built-in horizontal scroll bar to CategoryOverflowCalendarDayView #2

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4fcd113
Add built-in horizontal scroll bar to CategoryOverflowCalendarDayView
solid-maksymtielnyi Jun 30, 2026
7a16749
Export ScrollbarVisibility
solid-maksymtielnyi Jun 30, 2026
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1 change: 1 addition & 0 deletions lib/calendar_day_view.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -17,4 +17,5 @@ export 'src/day_views/overflow/overflow_calendar_day_view.dart';
export 'src/models/categorized_day_event.dart';
export 'src/models/day_event.dart';
export 'src/models/event_category.dart';
export 'src/models/scrollbar_visibility.dart';
export 'src/models/typedef.dart';
87 changes: 58 additions & 29 deletions lib/src/day_views/category/category_overflow_calendar_day_view.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ import 'dart:math';

import 'package:calendar_day_view/src/extensions/list_extensions.dart';
import 'package:calendar_day_view/src/extensions/time_of_day_extension.dart';
import 'package:calendar_day_view/src/models/scrollbar_visibility.dart';
import 'package:calendar_day_view/src/widgets/timed_rebuilder.dart';
import 'package:flutter/material.dart';
import 'package:timezone/timezone.dart';
Expand Down Expand Up @@ -132,6 +133,7 @@ class CategoryOverflowCalendarDayView<T, U> extends StatefulWidget
this.horizontalScrollControllerGroup,
this.verticalScrollControllerGroup,
this.onLayoutMetrics,
this.horizontalScrollbarVisibility = ScrollbarVisibility.never,
ValueGetter<DateTime>? clock,
}) : clock = clock ?? DateTime.now,
super(key: key);
Expand All @@ -142,6 +144,7 @@ class CategoryOverflowCalendarDayView<T, U> extends StatefulWidget
final LinkedScrollControllerGroup? horizontalScrollControllerGroup;
final LinkedScrollControllerGroup? verticalScrollControllerGroup;
final CategoryDayViewLayoutMetricsCallback? onLayoutMetrics;
final ScrollbarVisibility horizontalScrollbarVisibility;
final ValueGetter<DateTime> clock;
final GroupingStrategy<T>? groupingStrategy;
final GroupLayoutStrategy<T, U>? groupLayoutStrategy;
Expand Down Expand Up @@ -269,6 +272,8 @@ class _CategoryOverflowCalendarDayViewState<T, U>
final totalWidth = max(minTotalWidth, constraints.maxWidth);
final rowLength = totalWidth - widget.timeColumnWidth;
final tileWidth = rowLength / categoriesCount;
final isHorizontallyOverflowing =
minTotalWidth > constraints.maxWidth;

final onLayoutMetrics = widget.onLayoutMetrics;

Expand Down Expand Up @@ -352,38 +357,42 @@ class _CategoryOverflowCalendarDayViewState<T, U>
decoration: BoxDecoration(
border: widget.tableBodyBorder,
color: Colors.black),
child: SingleChildScrollView(
controller: _vertScrollController,
clipBehavior: Clip.none,
physics: const ClampingScrollPhysics(),
child: _wrapWithHorizontalScrollbar(
isOverflowing: isHorizontallyOverflowing,
child: SingleChildScrollView(
controller: _horizScrollController,
controller: _vertScrollController,
clipBehavior: Clip.none,
physics: const ClampingScrollPhysics(),
scrollDirection: Axis.horizontal,
child: SizedBox(
width: rowLength,
child: _DayViewBody<T, U>(
timeList: timeList,
rowHeight: rowHeight,
tileWidth: tileWidth,
evenRowColor: widget.evenRowColor,
oddRowColor: widget.oddRowColor,
rowBuilder: widget.backgroundTimeTileBuilder,
events: widget.events,
categories: widget.categories,
verticalDivider: widget.verticalDivider,
timeGap: widget.timeGap,
heightPerMin: widget.heightPerMin,
timeTextStyle: widget.timeTextStyle,
eventBuilder: widget.eventBuilder,
horizontalDivider: widget.horizontalDivider,
onTileTap: widget.onTileTap,
groupingStrategy: widget.groupingStrategy ??
NoGroupingStrategy<T>(),
groupLayoutStrategy:
widget.groupLayoutStrategy,
clock: widget.clock,
child: SingleChildScrollView(
controller: _horizScrollController,
clipBehavior: Clip.none,
physics: const ClampingScrollPhysics(),
scrollDirection: Axis.horizontal,
child: SizedBox(
width: rowLength,
child: _DayViewBody<T, U>(
timeList: timeList,
rowHeight: rowHeight,
tileWidth: tileWidth,
evenRowColor: widget.evenRowColor,
oddRowColor: widget.oddRowColor,
rowBuilder:
widget.backgroundTimeTileBuilder,
events: widget.events,
categories: widget.categories,
verticalDivider: widget.verticalDivider,
timeGap: widget.timeGap,
heightPerMin: widget.heightPerMin,
timeTextStyle: widget.timeTextStyle,
eventBuilder: widget.eventBuilder,
horizontalDivider: widget.horizontalDivider,
onTileTap: widget.onTileTap,
groupingStrategy: widget.groupingStrategy ??
NoGroupingStrategy<T>(),
groupLayoutStrategy:
widget.groupLayoutStrategy,
clock: widget.clock,
),
),
),
),
Expand All @@ -401,6 +410,26 @@ class _CategoryOverflowCalendarDayViewState<T, U>
);
}

Widget _wrapWithHorizontalScrollbar({
required bool isOverflowing,
required Widget child,
}) {
final visibility = widget.horizontalScrollbarVisibility;

if (visibility == ScrollbarVisibility.never || !isOverflowing) {
return child;
}

return Scrollbar(
controller: _horizScrollController,
thumbVisibility: visibility == ScrollbarVisibility.always,
scrollbarOrientation: ScrollbarOrientation.bottom,
notificationPredicate: (notification) =>
notification.metrics.axis == Axis.horizontal,
child: child,
);
}

@override
void dispose() {
_headerScrollController.dispose();
Expand Down
6 changes: 6 additions & 0 deletions lib/src/models/scrollbar_visibility.dart
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
/// Controls when the horizontal scrollbar is shown.
enum ScrollbarVisibility {
never,
always,
whileScrolling,
}