appcraft_ui_calendar_flutter

A Flutter calendar package with date selection, theming and multiple display modes. It provides ready-to-use widgets — the full-screen vertical calendar ACCalendarScreen, the paged horizontal ACPagesCalendarWidget and the card-based ACPagesCalendarCard — three selection modes (single, range, multi), fine-grained theming via ThemeExtension, a time-picker widget and localization. Suitable for any screen that needs a customizable date-selection component — without writing calendar logic from scratch.

Features

• Three date-selection modes: single (ACCalendarSingleSelectController), range (ACCalendarRangeSelectController), multi (ACCalendarMultiSelectController).
• Ready-to-use widgets: ACCalendarScreen (full-screen vertical calendar with Scaffold and AppBar) and ACPagesCalendarWidget (paged horizontal calendar).
• Card component: ACPagesCalendarCard — a card based on ACPagesCalendarWidget.
• Built-in theme: ACLightCalendarThemeData with fine-grained customization via ACLightDayThemeData, ACLightWeekThemeData and other sub-themes.
• Time-picker widget: ACTitledTimeWidget for display below the calendar.
• Localization: configured via the locale parameter (e.g. 'ru', 'en').
• Navigation range limit: ACDateRange(min:, max:) sets the allowed bounds.

Installation

flutter pub add appcraft_ui_calendar_flutter

Usage

1. Single selection — ACCalendarSingleSelectController

Select a single date with the full-screen ACCalendarScreen.

import 'package:appcraft_ui_calendar_flutter/appcraft_ui_calendar_flutter.dart';
import 'package:flutter/material.dart';

class SingleSelectPage extends StatefulWidget {
  const SingleSelectPage({super.key});

  @override
  State<SingleSelectPage> createState() => _SingleSelectPageState();
}

class _SingleSelectPageState extends State<SingleSelectPage> {
  final _selectController = ACCalendarSingleSelectController();

  @override
  void dispose() {
    _selectController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ACCalendarScreen(
      range: ACDateRange(
        min: DateTime(2024, 1, 1),
        max: DateTime(2025, 12, 31),
      ),
      selectController: _selectController,
    );
  }
}

2. Range selection — ACCalendarRangeSelectController

Select a date range with a time widget below the calendar.

class RangeSelectPage extends StatefulWidget {
  const RangeSelectPage({super.key});

  @override
  State<RangeSelectPage> createState() => _RangeSelectPageState();
}

class _RangeSelectPageState extends State<RangeSelectPage> {
  final _selectController = ACCalendarRangeSelectController();

  @override
  void dispose() {
    _selectController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ACCalendarScreen(
      range: ACDateRange(
        min: DateTime(2024, 1, 1),
        max: DateTime(2025, 12, 31),
      ),
      selectController: _selectController,
      timeWidget: ACTitledTimeWidget.range(),
    );
  }
}

3. Multi selection — ACCalendarMultiSelectController

Select multiple arbitrary dates.

class MultiSelectPage extends StatefulWidget {
  const MultiSelectPage({super.key});

  @override
  State<MultiSelectPage> createState() => _MultiSelectPageState();
}

class _MultiSelectPageState extends State<MultiSelectPage> {
  final _selectController = ACCalendarMultiSelectController();

  @override
  void dispose() {
    _selectController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ACCalendarScreen(
      range: ACDateRange(
        min: DateTime(2024, 1, 1),
        max: DateTime(2025, 12, 31),
      ),
      selectController: _selectController,
    );
  }
}

4. Paged calendar — ACPagesCalendarWidget

A horizontal calendar with color overrides via ThemeExtension and localization.

import 'package:appcraft_ui_calendar_flutter/appcraft_ui_calendar_flutter.dart';
import 'package:flutter/material.dart';

class CustomThemeCalendarPage extends StatefulWidget {
  const CustomThemeCalendarPage({super.key});

  @override
  State<CustomThemeCalendarPage> createState() =>
      _CustomThemeCalendarPageState();
}

class _CustomThemeCalendarPageState extends State<CustomThemeCalendarPage> {
  final _selectController = ACCalendarSingleSelectController();

  @override
  void dispose() {
    _selectController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Theme(
      data: Theme.of(context).copyWith(
        extensions: [
          ACCalendarThemeExtension(
            data: ACLightCalendarThemeData(
              dayTheme: ACLightDayThemeData(
                selectedBackgroundColor: Colors.deepPurple,
                textColor: Colors.black,
                todayTextStyle: const TextStyle(
                  color: Colors.deepPurple,
                  fontWeight: FontWeight.w700,
                ),
              ),
            ),
          ),
        ],
      ),
      child: Scaffold(
        body: Padding(
          padding: const EdgeInsets.all(16),
          child: ACPagesCalendarWidget(
            range: ACDateRange(
              min: DateTime(2024, 1, 1),
              max: DateTime(2025, 12, 31),
            ),
            selectController: _selectController,
            locale: 'ru',
          ),
        ),
      ),
    );
  }
}

Theming

The calendar theme integrates through Flutter's standard ThemeExtension mechanism. This lets you define the theme at the application's ThemeData level and override it for individual widget subtrees.

Setting the theme at the application level

MaterialApp(
  theme: ThemeData(
    extensions: [
      ACCalendarThemeExtension(
        data: ACLightCalendarThemeData(
          backgroundColor: Colors.white,
          dayTheme: ACLightDayThemeData(
            selectedBackgroundColor: Colors.indigo,
            textColor: Colors.grey.shade800,
          ),
          weekTheme: ACLightWeekThemeData(
            textColor: Colors.grey.shade600,
          ),
        ),
      ),
    ],
  ),
  home: const MyHomePage(),
);

Customizing sub-themes

ACLightCalendarThemeData combines several sub-theme classes, each responsible for its own part of the calendar:

ACLightCalendarThemeData(
  // Day cell theme
  dayTheme: ACLightDayThemeData(
    selectedBackgroundColor: Colors.indigo,
    middleSelectedBackgroundColor: Colors.indigo.shade100,
    textColor: Colors.black,
    inactiveTextColor: Colors.grey,
    todayTextStyle: const TextStyle(
      color: Colors.indigo,
      fontWeight: FontWeight.bold,
    ),
  ),
  // Weekday row theme
  weekTheme: ACLightWeekThemeData(
    textColor: Colors.grey,
  ),
  // Month picker theme
  monthPickerTheme: ACLightMonthPickerThemeData(
    actionTextColor: Colors.indigo,
  ),
  // Paged calendar header theme
  pagesCalendarHeaderTheme: ACLightPagesCalendarHeaderThemeData(
    arrowRotateDuration: const Duration(milliseconds: 200),
  ),
  // Overall calendar background
  backgroundColor: Colors.white,
)

Obtaining the theme from context

ACCalendarThemeExtension.of(context) returns the theme from the nearest Theme. If the theme is not set explicitly, default values are returned (the light theme):

@override
Widget build(BuildContext context) {
  final calendarTheme = ACCalendarThemeExtension.of(context);
  final dayColor = calendarTheme.dayTheme.textColor;
  // ...
}

API Reference

Widgets:

• ACCalendarScreen — full-screen vertical scroll calendar with Scaffold and AppBar.
• ACCalendarWidget / ACRawCalendarWidget — vertical scroll calendar (with theming / without the theme wrapper).
• ACPagesCalendarWidget / ACRawPagesCalendarWidget — paged horizontal calendar.
• ACPagesCalendarCard — a card based on the paged calendar.
• ACPagesCalendarSheet — a bottom sheet with the paged calendar.
• ACTitledTimeWidget, ACTimeInputWidget, ACTimeRangeInputWidget — time-selection widgets.

Selection controllers:

• ACCalendarSelectController — base controller (ChangeNotifier).
• ACCalendarSingleSelectController — single date selection.
• ACCalendarRangeSelectController — date range selection.
• ACCalendarMultiSelectController — multiple date selection.

Domain types:

• ACDateRange — navigation bounds (min, max).
• ACDateSelectRange, ACTimeSelectRange — the selected date / time range.
• ACDayMonthPosition — a day's position in the month grid (current/leading/ trailing); factory ACDayMonthPosition.forDay(day, monthDate).
• ACDaySelectState — a day's selection state.
• ACDateFormat — date formatting.

Theming:

• ACCalendarThemeExtension — a ThemeExtension for integrating the calendar theme.
• ACLightCalendarThemeData — the light theme and its sub-themes (ACLightDayThemeData, ACLightWeekThemeData, ACLightMonthPickerThemeData, ACLightPagesCalendarHeaderThemeData, etc.).

Localization:

• ACLocalizationManager / ACDefaultLocalizationManager — the localization manager.
• ACLocalization, ACLocalizationRu, ACLocalizationEn — string sets.

Detailed documentation is available in the dartdoc on pub.dev.

Example

A complete example app demonstrating all selection modes and package features is available in the example/ folder.

To run it:

cd example
flutter pub get
flutter run

License

MIT — see LICENSE.