77 lines
2.2 KiB
Dart
77 lines
2.2 KiB
Dart
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import 'package:calorimeter/perdate/perdate_widget.dart';
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import 'package:flutter/material.dart';
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class PerDatePageview extends StatefulWidget {
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// this is the date for which the PerDate widget will be shown on screen
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// left of it will be yesterday's PerDate widget
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// right of it will be tomorrow's PerDate widget
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final DateTime initalDate;
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const PerDatePageview({required this.initalDate, super.key});
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@override
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State<PerDatePageview> createState() => _PerDatePageviewState();
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}
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class _PerDatePageviewState extends State<PerDatePageview> {
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late PageController pageController;
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late DateTime displayedDate;
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late List<int> visitedIndexes = [];
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final int initialOffset = 36500000;
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//TODO: that is just ugly
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bool backButtonWasPressed = false;
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@override
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void initState() {
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super.initState();
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pageController = PageController(initialPage: initialOffset);
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displayedDate = widget.initalDate;
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visitedIndexes.add(initialOffset);
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}
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@override
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Widget build(BuildContext context) {
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return BackButtonListener(
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onBackButtonPressed: () async {
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if (visitedIndexes.length == 1) {
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return false;
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}
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visitedIndexes.removeLast();
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backButtonWasPressed = true;
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pageController.jumpToPage(visitedIndexes.last);
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return true;
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},
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child: PageView.builder(
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reverse: true,
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controller: pageController,
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onPageChanged: (value) {
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if (backButtonWasPressed) {
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backButtonWasPressed = false;
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return;
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}
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visitedIndexes.add(value);
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},
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itemBuilder: (context, index) {
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var dateToBuildWidgetFor =
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displayedDate.subtract(Duration(days: index - initialOffset));
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return PerDateWidget(
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key: ValueKey(dateToBuildWidgetFor.toString()),
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date: dateToBuildWidgetFor,
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onDateSelected: (dateSelected) {
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if (dateSelected == null) return;
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var diff = dateSelected.difference(dateToBuildWidgetFor);
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var newIndex = index - diff.inDays;
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pageController.jumpToPage(newIndex);
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});
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}),
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);
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}
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}
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