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| import 'package:flutter/material.dart';
class TicTacToe extends StatefulWidget {
const TicTacToe({super.key});
@override
State<TicTacToe> createState() => _TicTacToeState();
}
class _TicTacToeState extends State<TicTacToe> {
int scoreP1 = 0;
int scoreP2 = 0;
bool _isP1Turn = true;
Color p1TurnColor = Colors.red;
Color p2TurnColor = Colors.transparent;
// Default value is 9.
// Player 1's value is 1, Player 2's value is 2.
// Calculate sum of row, column, diagonal,
// and if this value is 3 or 6, then the game is end.
List<int> gridValue = [9, 9, 9, 9, 9, 9, 9, 9, 9];
void _resetScore() {
setState(() {
scoreP1 = 0;
scoreP2 = 0;
_isP1Turn = true;
gridValue = [9, 9, 9, 9, 9, 9, 9, 9, 9];
});
_whoTurn();
}
Icon? _checkedArea({required int index}) {
if (gridValue[index] == 1) {
return Icon(Icons.circle_outlined);
} else if (gridValue[index] == 2) {
return Icon(Icons.close);
}
return null;
}
void _whoTurn() {
setState(() {
p1TurnColor = _isP1Turn ? Colors.red : Colors.transparent;
p2TurnColor = !_isP1Turn ? Colors.red : Colors.transparent;
});
}
void _whenClick({required int index}) {
if (gridValue[index] == 9) {
if (_isP1Turn) {
gridValue[index] = 1;
} else {
gridValue[index] = 2;
}
_isP1Turn = !_isP1Turn;
_checkGame();
_whoTurn();
}
}
void _checkGame() {
List<int> setOfLines = [
gridValue[0] + gridValue[1] + gridValue[2], // row 1
gridValue[3] + gridValue[4] + gridValue[5], // row 2
gridValue[6] + gridValue[7] + gridValue[8], // row 3
gridValue[0] + gridValue[3] + gridValue[6], // column 1
gridValue[1] + gridValue[4] + gridValue[7], // column 2
gridValue[2] + gridValue[5] + gridValue[8], // column 3
gridValue[0] + gridValue[4] + gridValue[8], // diagonal 1
gridValue[2] + gridValue[4] + gridValue[6], // diagonal 2
];
if (setOfLines.contains(3)) {
// Player1 is winner: 1+1+1 = 3
_showDialog(winner: 1);
} else if (setOfLines.contains(6)) {
// Player2 is winner: 2+2+2 = 6
_showDialog(winner: 2);
} else if (setOfLines.every((item) => item < 9)) {
// Draw.
// If there is at least one empty space,
// the sum will always exceed 9 because the default value is 9.
// If there are no empty spaces,
// the maximum sum is 6,
// which means that [item < 9] refers to the case
// where all squares are checked but there is no winner.
_showDrawDialog();
}
}
void _showDialog({required int winner}) {
showDialog(
barrierDismissible: false,
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text("Winner is Player$winner"),
actions: [
TextButton(
onPressed: () {
Navigator.of(context).pop();
setState(() {
if (winner == 1) {
scoreP1++;
_isP1Turn = false;
} else {
scoreP2++;
_isP1Turn = true;
}
gridValue = [9, 9, 9, 9, 9, 9, 9, 9, 9];
});
},
child: Text("Play again"),
),
],
);
},
);
}
void _showDrawDialog() {
// Draw
showDialog(
barrierDismissible: false,
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text("Draw"),
actions: [
TextButton(
onPressed: () {
Navigator.of(context).pop();
setState(() {
gridValue = [9, 9, 9, 9, 9, 9, 9, 9, 9];
});
},
child: Text("Play again"),
),
],
);
},
);
}
@override
Widget build(BuildContext context) {
return Center(
child: Column(
children: [
Text("Tic Tac Toe"),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
"Player 1(O): $scoreP1",
style: TextStyle(
backgroundColor: p1TurnColor,
),
),
SizedBox(
width: 30,
),
Text(
"Player 2(X): $scoreP2",
style: TextStyle(
backgroundColor: p2TurnColor,
),
),
],
),
ElevatedButton(
onPressed: _resetScore,
child: Text("Reset Score"),
),
// Tic Tac Toe game.
Expanded(
child: GridView.count(
crossAxisCount: 3,
children: List.generate(
9,
(index) {
return Container(
decoration: BoxDecoration(
border: Border.all(
color: Colors.black,
),
),
child: GestureDetector(
onTap: () {
_whenClick(index: index);
},
child: _checkedArea(index: index),
),
);
},
),
),
),
],
),
);
}
}
|
