Fused Date Picker

[sarbagyastha]

For testing out the fused date picker:

nepali_date_picker:
  git:
    url: https://github.com/sarbagyastha/nepali_date_picker.git
    ref: fused

[Copilot]

Pull Request Overview

This PR introduces a “fused” date picker that lets users switch between Gregorian and Nepali calendars, renames the internal date-picker dialog class to a public API with a selection callback, and updates the example app accordingly.

• Publicly exposes NepaliDatePickerDialog (formerly _DatePickerDialog) and adds an onDateChanged callback.
• Adds FusedDatePickerDialog with an AD/BS toggle and integrates it into the example app’s UI.
• Bumps the example’s SDK constraint and refactors example project boilerplate (AppDelegates, buttons, main app structure).

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lib/src/material/date_picker.dart	Renamed _DatePickerDialog → NepaliDatePickerDialog, added onDateChanged and initialEntryMode fields
lib/src/fused_date_picker_dialog.dart	New FusedDatePickerDialog with AD/BS toggle and switch-based builder
lib/nepali_date_picker.dart	Exported the new fused dialog
example/pubspec.yaml	Updated Dart SDK lower bound to >=3.5.0 <4.0.0
example/macos/Runner/AppDelegate.swift	Replaced @NSApplicationMain with @main
example/ios/Runner/AppDelegate.swift	Replaced @UIApplicationMain with @main
example/lib/modes/date_range_picker_widget.dart	Removed custom styling from example buttons
example/lib/modes/date_picker_widget.dart	Removed custom styling from example buttons
example/lib/modes/calendar_date_picker_widget.dart	Simplified sizing and text styles in TodayWidget
example/lib/main.dart	Refactored app entry into HomePage, added fused date-picker tab

Comments suppressed due to low confidence (2)

lib/src/fused_date_picker_dialog.dart:1

• There are no unit or widget tests covering the new FusedDatePickerDialog. Adding tests for mode toggling, date selection, and dialog result will help prevent regressions.

import 'package:flutter/material.dart';

lib/src/material/date_picker.dart:216

• The new initialEntryMode field is never initialized in the constructor. Add a constructor parameter or provide a default value to avoid a compilation error.

  final DatePickerEntryMode initialEntryMode;

[Copilot]

The DefaultTabController length (5) does not match the number of tabs and views (4), which will trigger an assertion failure. Please update the length to match.

[Copilot]

[nitpick] The toggle control is rendered outside of a dialog container. Consider wrapping the toggle and picker widgets in a Dialog or AlertDialog so the entire UI appears as a single modal dialog.

Suggested change

	return Column(
	mainAxisAlignment: MainAxisAlignment.center,
	children: [
	_AdBsToggle(
	onChanged: (mode) {
	_mode = mode;
	setState(() {});
	},
	),
	switch (_mode) {
	CalendarMode.ad => DatePickerDialog(
	firstDate: widget.firstDate,
	lastDate: widget.lastDate,
	currentDate: _selectedDate,
	),
	CalendarMode.bs => NepaliDatePickerDialog(
	initialDate: NepaliDateTime.now(),
	firstDate: widget.firstDate.toNepaliDateTime(),
	lastDate: widget.lastDate.toNepaliDateTime(),
	onDateChanged: (date) {
	_selectedDate = date.toDateTime();
	},
	),
	}
	],
	return AlertDialog(
	content: Column(
	mainAxisSize: MainAxisSize.min,
	children: [
	_AdBsToggle(
	onChanged: (mode) {
	_mode = mode;
	setState(() {});
	},
	),
	switch (_mode) {
	CalendarMode.ad => DatePickerDialog(
	firstDate: widget.firstDate,
	lastDate: widget.lastDate,
	currentDate: _selectedDate,
	),
	CalendarMode.bs => NepaliDatePickerDialog(
	initialDate: NepaliDateTime.now(),
	firstDate: widget.firstDate.toNepaliDateTime(),
	lastDate: widget.lastDate.toNepaliDateTime(),
	onDateChanged: (date) {
	_selectedDate = date.toDateTime();
	},
	),
	}
	],
	),