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simple calc feature

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yaso
2025-01-14 14:48:50 +02:00
parent 62284b55e1
commit fdf3c66e26
1 changed files with 252 additions and 0 deletions
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Frontend/lib/mih_packages/calculator/simple_calc.dart Normal file
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import 'package:Mzansi_Innovation_Hub/main.dart';
import 'package:Mzansi_Innovation_Hub/mih_components/mih_inputs_and_buttons/mih_button.dart';
import 'package:flutter/material.dart';
import 'package:math_expressions/math_expressions.dart';
class SimpleCalc extends StatefulWidget {
const SimpleCalc({super.key});
@override
State<SimpleCalc> createState() => _SimpleCalcState();
}
class _SimpleCalcState extends State<SimpleCalc> {
var userInput = '';
var answer = '0';
// Array of button
final List<String> buttons = [
'C',
'(',
')',
'Del',
'7',
'8',
'9',
'/',
'4',
'5',
'6',
'x',
'1',
'2',
'3',
'-',
'0',
'.',
'=',
'+',
];
// function to calculate the input operation
void equalPressed() {
String finaluserinput = userInput;
finaluserinput = userInput.replaceAll('x', '*');
Parser p = Parser();
Expression exp = p.parse(finaluserinput);
ContextModel cm = ContextModel();
double eval = exp.evaluate(EvaluationType.REAL, cm);
answer = eval.toString();
}
@override
Widget build(BuildContext context) {
return Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Text(
"Simple Calculator",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 25,
fontWeight: FontWeight.bold,
color: MzanziInnovationHub.of(context)!.theme.secondaryColor(),
),
),
Divider(color: MzanziInnovationHub.of(context)!.theme.secondaryColor()),
const SizedBox(height: 10),
Container(
//color: Colors.white,
padding: const EdgeInsets.all(20),
alignment: Alignment.centerRight,
child: Text(
userInput,
style: TextStyle(
fontSize: 18,
color: MzanziInnovationHub.of(context)!.theme.secondaryColor(),
),
),
),
Container(
width: double.infinity,
//color: Colors.white,
padding: const EdgeInsets.all(15),
alignment: Alignment.centerRight,
child: Text(
answer,
style: TextStyle(
fontSize: 30,
color: MzanziInnovationHub.of(context)!.theme.secondaryColor(),
fontWeight: FontWeight.bold),
),
),
GridView.builder(
physics: const NeverScrollableScrollPhysics(),
shrinkWrap: true,
// padding: EdgeInsets.only(
// left: width / 10,
// right: width / 10,
// bottom: height / 15,
// //top: 20,
// ),
// shrinkWrap: true,
itemCount: buttons.length,
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 4),
itemBuilder: (context, index) {
// Clear Button
if (index == 0) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: MIHButton(
onTap: () {
setState(() {
userInput = '';
answer = '0';
});
},
buttonText: buttons[index],
buttonColor:
MzanziInnovationHub.of(context)!.theme.messageTextColor(),
textColor:
MzanziInnovationHub.of(context)!.theme.primaryColor(),
),
);
}
// +/- button
else if (index == 1) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: MIHButton(
onTap: () {
setState(() {
userInput += buttons[index];
});
},
buttonText: buttons[index],
buttonColor:
MzanziInnovationHub.of(context)!.theme.messageTextColor(),
textColor:
MzanziInnovationHub.of(context)!.theme.primaryColor(),
),
);
}
// % Button
else if (index == 2) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: MIHButton(
onTap: () {
setState(() {
userInput += buttons[index];
});
},
buttonText: buttons[index],
buttonColor:
MzanziInnovationHub.of(context)!.theme.messageTextColor(),
textColor:
MzanziInnovationHub.of(context)!.theme.primaryColor(),
),
);
}
// Delete Button
else if (index == 3) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: MIHButton(
onTap: () {
setState(() {
userInput = userInput.substring(0, userInput.length - 1);
});
},
buttonText: buttons[index],
buttonColor:
MzanziInnovationHub.of(context)!.theme.errorColor(),
textColor:
MzanziInnovationHub.of(context)!.theme.primaryColor(),
),
);
}
// Equal_to Button
else if (index == 18) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: MIHButton(
onTap: () {
setState(() {
equalPressed();
});
},
buttonText: buttons[index],
buttonColor:
MzanziInnovationHub.of(context)!.theme.successColor(),
textColor:
MzanziInnovationHub.of(context)!.theme.primaryColor(),
),
);
}
// +, -, / x buttons
else if (index == 7 || index == 11 || index == 15 || index == 19) {
return Padding(
padding: const EdgeInsets.all(4.0),
child: MIHButton(
onTap: () {
if (answer == "0") {
setState(() {
userInput += buttons[index];
});
} else {
setState(() {
userInput = answer;
answer = "0";
userInput += buttons[index];
});
}
// setState(() {
// userInput += buttons[index];
// });
},
buttonText: buttons[index],
buttonColor:
MzanziInnovationHub.of(context)!.theme.messageTextColor(),
textColor:
MzanziInnovationHub.of(context)!.theme.primaryColor(),
),
);
}
// other buttons
else {
return Padding(
padding: const EdgeInsets.all(4.0),
child: MIHButton(
onTap: () {
setState(() {
userInput += buttons[index];
});
},
buttonText: buttons[index],
buttonColor:
MzanziInnovationHub.of(context)!.theme.secondaryColor(),
textColor:
MzanziInnovationHub.of(context)!.theme.primaryColor(),
),
);
}
},
),
],
);
}
}