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import 'package:flutter/material.dart';
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import '../../common/settings.dart';
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class AdvancedDateRangePicker extends StatefulWidget {
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final DateTimeRange? initialRange;
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const AdvancedDateRangePicker({super.key, this.initialRange});
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@override
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State<AdvancedDateRangePicker> createState() => _AdvancedDateRangePickerState();
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}
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class _AdvancedDateRangePickerState extends State<AdvancedDateRangePicker> {
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late DateTime _currentMonth;
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DateTime? _start;
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DateTime? _end;
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late PageController _pageController;
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int _initialPage = 500; // large buffer for infinite scroll
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@override
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void initState() {
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super.initState();
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_initialPage = 500;
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_pageController = PageController(initialPage: _initialPage);
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_currentMonth = DateTime(DateTime.now().year, DateTime.now().month, 1);
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if (widget.initialRange != null) {
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_start = widget.initialRange!.start;
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_end = widget.initialRange!.end;
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}
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}
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@override
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Widget build(BuildContext context) {
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return Dialog(
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backgroundColor: Colors.white, // White background
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shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
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child: Container(
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padding: const EdgeInsets.all(5),
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width: 420,
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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_buildHeader(),
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const SizedBox(height: 12),
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_buildWeekDays(),
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SizedBox(
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height: 270,
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child: PageView.builder(
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controller: _pageController,
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onPageChanged: (pageIndex) { //to update the current month state when user swipes
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setState(() {
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int diff = pageIndex - _initialPage;
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_currentMonth = DateTime(
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DateTime.now().year,
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DateTime.now().month + diff,
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1,
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);
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});
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},
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itemBuilder: (context, index) { //to build the calendar for each month
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int diff = index - _initialPage;
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DateTime monthToShow = DateTime(
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DateTime.now().year,
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DateTime.now().month + diff,
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1,
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);
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return _buildCalendarGrid(monthToShow);
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},
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),
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),
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const SizedBox(height: 12),
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_buildSelectionText(),
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const SizedBox(height: 16),
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_buildFooter()
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],
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),
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),
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);
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}
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// -----------------------------------------------------------
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// 🔵 HEADER (Month – Year + Arrows)
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// -----------------------------------------------------------
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Widget _buildHeader() {
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return Column(
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children: [
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// Title
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const Padding(
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padding: EdgeInsets.symmetric(vertical: 8.0),
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child: Text(
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"Select a Date Range",
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style: TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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color: Colors.black,
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),
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),
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),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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IconButton(
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icon: const Icon(Icons.arrow_left, color: Colors.black),
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onPressed: () {
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_pageController.previousPage(
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duration: const Duration(milliseconds: 250),
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curve: Curves.easeOut,
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);
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},
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),
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GestureDetector(
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onTap: () => _showYearPicker(context),
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child: Text(
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"${_monthName(_currentMonth.month)} ${_currentMonth.year}",
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style: fontTextStyle(18, Colors.black, FontWeight.w400),
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),
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),
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IconButton(
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icon: const Icon(Icons.arrow_right, color: Colors.black),
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onPressed: () {
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_pageController.nextPage(
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duration: const Duration(milliseconds: 250),
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curve: Curves.easeOut,
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);
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},
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),
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],
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)
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],
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);
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}
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// -----------------------------------------------------------
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// 🔵 WEEK DAY ROW
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// -----------------------------------------------------------
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Widget _buildWeekDays() {
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const days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
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return Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: days
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.map((d) => Expanded(
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child: Center(
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child: Text(
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d,
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style: fontTextStyle(14, Colors.black, FontWeight.w600),
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),
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),
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))
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.toList(),
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);
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}
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// -----------------------------------------------------------
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// 🔵 BUILD CALENDAR GRID
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// -----------------------------------------------------------
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Widget _buildCalendarGrid(DateTime month) {
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List<Widget> rows = [];
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DateTime firstDay = DateTime(month.year, month.month, 1);
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int startingWeekday = firstDay.weekday % 7; // Sunday=0
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int daysInMonth = DateTime(month.year, month.month + 1, 0).day;
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List<Widget> dayCells = [];
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// Empty cells before month starts
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for (int i = 0; i < startingWeekday; i++) {
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dayCells.add(const Expanded(child: SizedBox()));
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}
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// Month days
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for (int d = 1; d <= daysInMonth; d++) {
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DateTime date = DateTime(month.year, month.month, d);
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bool isToday = _isSame(date, DateTime.now()); // Highlight today
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bool isSelectedStart = _isSame(date, _start);
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bool isSelectedEnd = _isSame(date, _end);
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bool inRange =
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_start != null && _end != null && date.isAfter(_start!) && date.isBefore(_end!);
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dayCells.add(
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Expanded(
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child: GestureDetector(
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onTap: () => _onDateTap(date),
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child: Container(
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margin: const EdgeInsets.all(4),
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padding: const EdgeInsets.all(8),
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decoration: BoxDecoration(
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color: isSelectedStart || isSelectedEnd
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? Colors.black
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: inRange
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? Colors.black12
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: Colors.transparent,
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shape: BoxShape.circle,
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border: isToday && !isSelectedStart && !isSelectedEnd
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? Border.all(color: Colors.blueAccent, width: 2) // Highlight today
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: null,
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),
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child: Center(
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child: Text(
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"$d",
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style: TextStyle(
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color: isSelectedStart || isSelectedEnd
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? Colors.white
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: Colors.black,
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fontWeight: isToday ? FontWeight.bold : FontWeight.normal,
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),
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),
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),
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),
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),
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),
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);
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// Create a row after each week
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if ((dayCells.length) % 7 == 0) {
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rows.add(Row(children: dayCells));
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dayCells = [];
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}
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}
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// Last row fill remaining empty cells
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if (dayCells.isNotEmpty) {
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while (dayCells.length < 7) {
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dayCells.add(const Expanded(child: SizedBox()));
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}
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rows.add(Row(children: dayCells));
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}
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return Column(children: rows);
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}
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// -----------------------------------------------------------
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// 🔵 DATE TAP LOGIC
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// -----------------------------------------------------------
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void _onDateTap(DateTime date) {
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setState(() {
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if (_start == null || (_start != null && _end != null)) {
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_start = date;
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_end = null;
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} else if (date.isBefore(_start!)) {
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_end = _start;
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_start = date;
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} else {
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_end = date;
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}
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});
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}
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// -----------------------------------------------------------
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// 🔵 SELECTED TEXT
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// -----------------------------------------------------------
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// Widget _buildSelectionText() {
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// return Text(
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// _start == null
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// ? "Choose Start Date"
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// : _end == null
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// ? "Choose End Date"
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// : "Selected: ${_fmt(_start!)} → ${_fmt(_end!)}",
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// style: fontTextStyle(14, Colors.blueAccent, FontWeight.w600),
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// );
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// }
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Widget _buildSelectionText() {
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if (_start == null || _end == null) {
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return const SizedBox(); // Show nothing
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}
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return Text(
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"Selected: ${_fmt(_start!)} → ${_fmt(_end!)}",
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style: fontTextStyle(14, Colors.blueAccent, FontWeight.w600),
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);
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}
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// -----------------------------------------------------------
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// 🔵 FOOTER BUTTONS
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// -----------------------------------------------------------
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Widget _buildFooter() {
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return Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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TextButton(
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child: Text("Cancel", style: fontTextStyle(14, Colors.black, FontWeight.w600)),
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onPressed: () => Navigator.pop(context),
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),
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ElevatedButton(
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.black,
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),
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onPressed: (_start != null && _end != null)
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? () => Navigator.pop(
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context,
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DateTimeRange(start: _start!, end: _end!),
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)
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: null,
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child: Text("Apply", style: fontTextStyle(14, Colors.white, FontWeight.bold)),
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),
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],
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);
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}
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// -----------------------------------------------------------
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// 🔧 HELPERS
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// -----------------------------------------------------------
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bool _isSame(DateTime? a, DateTime? b) {
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if (a == null || b == null) return false;
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return a.year == b.year && a.month == b.month && a.day == b.day;
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}
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String _fmt(DateTime d) => "${d.year}-${d.month}-${d.day}";
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String _monthName(int m) {
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const names = [
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"January","February","March","April","May","June",
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"July","August","September","October","November","December"
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];
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return names[m - 1];
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}
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// -----------------------------------------------------------
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// 🔵 YEAR PICKER SHEET
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// -----------------------------------------------------------
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void _showYearPicker(BuildContext context) {
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int currentYear = DateTime.now().year;
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int startYear = currentYear - 25;
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int endYear = currentYear + 25;
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int selectedYear = _currentMonth.year;
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ScrollController scrollController = ScrollController(
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initialScrollOffset: (selectedYear - startYear) * 48.0, // 56 is approx ListTile height
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);
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showDialog(
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context: context,
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builder: (_) => Dialog(
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backgroundColor: Colors.white,
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shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
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child: SizedBox(
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height: 300,
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child: ListView.builder(
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controller: scrollController,
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itemCount: endYear - startYear + 1,
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itemBuilder: (context, index) {
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int y = startYear + index;
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bool isSelected = y == selectedYear;
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return Center(
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child: GestureDetector(
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onTap: () {
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setState(() {
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_currentMonth = DateTime(y, _currentMonth.month, 1);
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});
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Navigator.pop(context);
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},
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child: Container(
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margin: const EdgeInsets.symmetric(vertical: 4),
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padding:
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const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
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decoration: BoxDecoration(
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color: isSelected ? Colors.black : Colors.white,
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borderRadius: BorderRadius.circular(12),
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border: Border.all(color: Colors.black12),
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),
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child: Text(
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"$y",
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style: fontTextStyle(
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16,
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isSelected ? Colors.white : Colors.black,
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FontWeight.bold,
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),
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),
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),
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),
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);
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},
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),
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),
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),
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);
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}
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//To clear the selected dates inside your custom calendar grid
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void _clearCalendarSelection() {
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setState(() {
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_start = null;
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_end = null;
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});
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}
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}
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