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caching the values used in the year value instruction instead of calculating them throughout the structure

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BroodjeAap 2020-12-19 16:27:23 +01:00
parent 9cb6f6b9fb
commit de660cf501
1 changed files with 35 additions and 12 deletions
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47
lib/pages/MonthValuesPage.dart
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@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
import 'package:numberpicker/numberpicker.dart';
import 'package:ohthatsa/other/AppDrawer.dart';
import 'package:ohthatsa/util/DayCalculator.dart';
import 'package:ohthatsa/util/Months.dart';
class MonthValuesPage extends StatefulWidget {
@ -11,7 +12,30 @@ class MonthValuesPage extends StatefulWidget {
}
class _MonthValuesState extends State<MonthValuesPage> {
int year = DateTime.now().year;
int year;
int yy;
String centuriesString;
String yyString;
double yyDiv4;
int yyDiv4Floored;
int yearValue;
@override
void initState(){
super.initState();
this.setYearValues(DateTime.now().year);
}
void setYearValues(newYear){
year = newYear;
yy = year % 100;
centuriesString = (year ~/ 100).toString();
yyString = year.toString().substring(2);
yyDiv4 = yy / 4;
yyDiv4Floored = yyDiv4.floor();
yearValue = DayCalculator.getYearValue(year);
setState(() {});
}
static const formulaStyle = TextStyle(
fontSize: 20
);
@ -122,14 +146,13 @@ class _MonthValuesState extends State<MonthValuesPage> {
initialValue: year,
minValue: 1700,
maxValue: 2399,
onChanged: (newYear) =>
setState(() => year = newYear),
onChanged: (newYear) => this.setYearValues(newYear)
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("With ", style: formulaStyle),
Text((year / 100).floor().toString(), style: formulaStyle),
Text(centuriesString, style: formulaStyle),
Text(year.toString().substring(2), style: YYStyle),
Text(" our formula becomes: ", style: formulaStyle),
],
@ -138,9 +161,9 @@ class _MonthValuesState extends State<MonthValuesPage> {
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("(", style: formulaStyle),
Text(year.toString().substring(2), style: YYStyle),
Text(yyString, style: YYStyle),
Text(" + floor(", style: formulaStyle),
Text(year.toString().substring(2), style: YYStyleU),
Text(yyString, style: YYStyleU),
Text(" / 4", style: formulaStyleU),
Text(")) % 7", style: formulaStyle),
],
@ -150,9 +173,9 @@ class _MonthValuesState extends State<MonthValuesPage> {
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("(", style: formulaStyle),
Text(year.toString().substring(2), style: YYStyle),
Text(yyString, style: YYStyle),
Text(" + ", style: formulaStyle),
Text("floor(" + ((year % 100) / 4).toString() + ")", style: formulaStyleU),
Text("floor(" + yyDiv4.toString() + ")", style: formulaStyleU),
Text(") % 7", style: formulaStyle),
],
),
@ -161,8 +184,8 @@ class _MonthValuesState extends State<MonthValuesPage> {
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("(", style: formulaStyleU),
Text(year.toString().substring(2), style: YYStyleU),
Text(" + " + ((year % 100) / 4).floor().toString() + ")", style: formulaStyleU),
Text(yyString, style: YYStyleU),
Text(" + " + yyDiv4Floored.toString() + ")", style: formulaStyleU),
Text(" % 7", style: formulaStyle),
],
),
@ -170,7 +193,7 @@ class _MonthValuesState extends State<MonthValuesPage> {
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(((year % 100) + ((year % 100) / 4).floor()).toString(), style: formulaStyleU),
Text((yy + yyDiv4Floored).toString(), style: formulaStyleU),
Text(" % 7", style: formulaStyleU),
],
),
@ -179,7 +202,7 @@ class _MonthValuesState extends State<MonthValuesPage> {
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("So the year value of " + year.toString() + " is: ", style: formulaStyle),
Text((((year % 100) + ((year % 100) / 4).floor()) % 7).toString(), style: formulaStyleU),
Text(yearValue.toString(), style: formulaStyleU),
],
),
Spacer(),