Calendar Day View

A powerful and customizable Flutter library for displaying calendar events in day view format. Perfect for applications requiring detailed daily event visualization.

🚨 Breaking Changes in v6.0.0

Migration from v5.x

Renamed tap callbacks — all tap callbacks are now consistently named onTimeTap:

View	Before (v5)	After (v6)
CalendarDayView.category()	onTileTap	onTimeTap
CalendarDayView.categoryOverflow()	onTileTap	onTimeTap
CalendarDayView.inRow()	onTap	onTimeTap
CalendarDayView.overflow()	onTimeTap	onTimeTap (no change)
CategoryDayView()	onTileTap	onTimeTap
CategoryOverflowDayView()	onTileTap	onTimeTap

Removed parameters:

• controlBarBuilder removed from CalendarDayView.category() and CalendarDayView.categoryOverflow()
• backgroundTimeTileBuilder removed from CalendarDayView.categoryOverflow()

Typedefs now exported — all typedefs (e.g., CategoryDayViewEventBuilder, DayViewItemBuilder) are now accessible via the main import 'package:calendar_day_view/calendar_day_view.dart' import. No need to import src/models/typedef.dart directly.

Styling moved to DayViewDecoration — all visual customization is now grouped in a separate DayViewDecoration object, passed via config.decoration:

// Before (v5.x)
OverFlowDayViewConfig(
  currentDate: DateTime.now(),
  timeColumnWidth: 70,
  dividerColor: Colors.black,
  currentTimeLineColor: Colors.red,
  timeLabelBuilder: (ctx, t) => Text(...),
)

// After (v6.x)
OverFlowDayViewConfig(
  currentDate: DateTime.now(),
  decoration: DayViewDecoration(
    timeColumnWidth: 70,
    dividerColor: Colors.black,
    currentTimeLineColor: Colors.red,
    timeLabel: (ctx, t) => Text(...),
  ),
)

Properties moved to DayViewDecoration: timeColumnWidth, timeTextStyle, timeTextColor, dividerColor, currentTimeLineColor, timeLabel (was timeLabelBuilder), currentTimeLine (was currentTimeLineBuilder), rowBackground (was timeRowBackgroundBuilder), divider (was dividerBuilder). The same decoration can be reused across multiple views for consistent branding.

What's New in v6.0.0

• Auto-scroll to current time — set scrollToCurrentTime: true in config to auto-scroll on load (overflow and in-row views)
• Custom current time line — use currentTimeLineBuilder in config to fully customize the current time indicator
• Show all events in category cell — set showAllEventsInCell: true in CategoryDavViewConfig to display all events horizontally instead of only the first
• Empty tile builder — use emptyTileBuilder in category views to customize empty cells
• Null end time safety — overflow views now default to 30 min duration for events without an end time instead of crashing
• Multi-Column Day View — new Google Calendar-style layout where overlapping events are placed side-by-side in columns with smart column reuse
• Config consolidation — currentTimeLineColor and cropBottomEvents moved to base DavViewConfig, available to all views without duplication
• Time row background builder — use timeRowBackgroundBuilder in config to shade specific time ranges (lunch break, working hours, unavailable blocks) in overflow, multi-column, and in-row views
• Divider builder — use divider in DayViewDecoration for custom dividers per row (dashed lines, per-row thickness, hide specific dividers)
• DayViewDecoration — new visual decoration class groups all styling and builder callbacks. Reusable across view types for shared theming
• Time column position — timeColumnPosition: TimeColumnPosition.left | .right | .none in decoration for flexible layouts
• Header / footer builders — header and footer in decoration for custom widgets above/below the time grid
• Custom overlap strategy — overlapStrategy on MultiColumnDayViewConfig<T> for custom multi-column layout algorithms

For full details, see the Changelog.

📱 Live Demo

Check out the live demo at: https://samderlust.github.io/calendardayview

✨ Features

View Types

• Multi-Column Day View: Google Calendar-style layout — overlapping events are placed side-by-side in columns with smart column reuse
• Category Overflow Day View: Display events across multiple time slots within categorized columns
• Category Day View: Organize events by categories (e.g., meeting rooms, resources)
• Overflow Day View: Traditional calendar view with events spanning multiple time slots
• In Row Day View: Group events starting in the same time window
• Event Day View: Simple chronological list of daily events

Customization Options

• ⏰ Customizable day start and end times
• ⏱️ Adjustable time slot duration
• 🕒 Current time indicator with custom builder support
• 👆 Interactive time slot tapping
• 🎨 Fully customizable event widgets
• 📱 Responsive design support
• 🔄 Auto-scroll to current time on load
• 📋 Show all events or first-only in category cells
• 🏷️ Custom empty tile builder for category views

📦 Installation

Add the package to your pubspec.yaml:

dependencies:
  calendar_day_view: <latest_version>

Then import it in your Dart code:

import 'package:calendar_day_view/calendar_day_view.dart';

🚀 Usage

Shared Decoration (v6.0+)

All visual customization is done via DayViewDecoration, which can be reused across view types:

final myDecoration = DayViewDecoration(
  timeColumnWidth: 70,
  dividerColor: Colors.grey.shade300,
  currentTimeLineColor: Colors.red,
  timeLabel: (context, time) => Text(
    DateFormat('HH:mm').format(time),
    style: const TextStyle(fontWeight: FontWeight.bold),
  ),
  rowBackground: (context, rowTime, constraints) {
    // Shade lunch break
    if (rowTime.hour == 12) {
      return Container(color: Colors.grey.withValues(alpha: 0.1));
    }
    return null;
  },
  divider: (context, rowTime) {
    // Thicker line at the hour
    if (rowTime.minute == 0) {
      return Divider(color: Colors.grey.shade400, thickness: 1.5, height: 0);
    }
    return null; // skip divider
  },
);

// Reuse the same decoration across different views
OverFlowDayViewConfig(currentDate: DateTime.now(), decoration: myDecoration);
MultiColumnDayViewConfig(currentDate: DateTime.now(), decoration: myDecoration);

Multi-Column Day View

Google Calendar-style layout. Overlapping events are automatically placed side-by-side in columns. Column count is determined by the overlap pattern — solo events get full width.

CalendarDayView.multiColumn(
  config: MultiColumnDayViewConfig(
    currentDate: DateTime.now(),
    timeGap: 60,
    heightPerMin: 2,
    startOfDay: const TimeOfDay(hour: 7, minute: 0),
    endOfDay: const TimeOfDay(hour: 20, minute: 0),
    scrollToCurrentTime: true,
  ),
  events: events,
  onTimeTap: (time) => handleTimeTap(time),
  itemBuilder: (context, constraints, event, columnIndex, totalColumns) {
    return Container(
      margin: const EdgeInsets.all(1),
      decoration: BoxDecoration(
        color: Colors.blue.shade100,
        borderRadius: BorderRadius.circular(4),
      ),
      child: Text(event.value),
    );
  },
);

Category Day View

Perfect for displaying events across multiple categories (e.g., meeting rooms, resources).

CalendarDayView.category(
  config: CategoryDavViewConfig(
    time12: true,
    allowHorizontalScroll: true,
    columnsPerPage: 2,
    currentDate: DateTime.now(),
    timeGap: 60,
    heightPerMin: 1,
    showAllEventsInCell: true, // show all events in cell horizontally
  ),
  categories: categories,
  events: events,
  onTimeTap: (category, time) {
    // Handle time slot tap
  },
  emptyTileBuilder: (constraints, category, time) {
    return Center(child: Text('Available'));
  },
  eventBuilder: (constraints, category, _, event) => YourEventWidget(),
);

Overflow Day View

Display events with duration visualization across multiple time slots.

CalendarDayView.overflow(
  config: OverFlowDayViewConfig(
    currentDate: DateTime.now(),
    timeGap: 60,
    heightPerMin: 2,
    endOfDay: const TimeOfDay(hour: 20, minute: 0),
    startOfDay: const TimeOfDay(hour: 4, minute: 0),
    renderRowAsListView: true,
    time12: true,
    scrollToCurrentTime: true, // auto-scroll to current time
  ),
  onTimeTap: (time) => handleTimeTap(time),
  events: UnmodifiableListView(events),
  overflowItemBuilder: (context, constraints, itemIndex, event) => YourEventWidget(),
);

Event Only Day View

Simple chronological list of events.

CalendarDayView.eventOnly(
  config: EventDayViewConfig(
    showHourly: true,
    currentDate: DateTime.now(),
  ),
  events: events,
  eventDayViewItemBuilder: (context, event) => YourEventWidget(),
);

In Row Day View

Group events starting in the same time window.

CalendarDayView.inRow(
  config: InRowDayViewConfig(
    heightPerMin: 1,
    showCurrentTimeLine: true,
    dividerColor: Colors.black,
    timeGap: 60,
    showWithEventOnly: true,
    currentDate: DateTime.now(),
    startOfDay: const TimeOfDay(hour: 3, minute: 00),
    endOfDay: const TimeOfDay(hour: 22, minute: 00),
    scrollToCurrentTime: true, // auto-scroll to current time
  ),
  events: UnmodifiableListView(events),
  onTimeTap: (time) => handleTimeTap(time),
  itemBuilder: (context, constraints, itemIndex, event) => YourEventWidget(),
);

📸 Screenshots

Category Day View

Overflow Day View

Normal	ListView

Event Only Day View

In Row Day View

🤝 Contributing

We welcome contributions! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Format your code with dart format --line-length 200 lib/ test/ example/
5. Push to the branch (git push origin feature/amazing-feature)
6. Open a Pull Request

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• Thanks to all contributors who have helped improve this package
• Special thanks to the Flutter team for creating such an amazing framework