Initial commit

lib/main.dart

@@ -0,0 +1,159 @@
+import 'package:flutter/material.dart';
+import 'calculator_logic.dart';
+
+void main() {
+  runApp(const KalkulatorApp());
+}
+
+class KalkulatorApp extends StatelessWidget {
+  const KalkulatorApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Kalkulator',
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: Colors.blueGrey,
+          brightness: Brightness.dark,
+        ),
+        useMaterial3: true,
+      ),
+      home: const CalculatorScreen(),
+    );
+  }
+}
+
+class CalculatorScreen extends StatefulWidget {
+  const CalculatorScreen({super.key});
+
+  @override
+  State<CalculatorScreen> createState() => _CalculatorScreenState();
+}
+
+class _CalculatorScreenState extends State<CalculatorScreen> {
+  final _logic = CalculatorLogic();
+
+  void _onPressed(String label) {
+    setState(() {
+      switch (label) {
+        case 'C':
+          _logic.clear();
+        case '+/-':
+          _logic.toggleSign();
+        case '%':
+          _logic.percent();
+        case '=':
+          _logic.calculate();
+        case '.':
+          _logic.inputDecimal();
+        case '+' || '-' || '*' || '/':
+          _logic.inputOperator(label);
+        default:
+          _logic.inputDigit(label);
+      }
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.black,
+      body: SafeArea(
+        child: Column(
+          children: [
+            Expanded(
+              child: Container(
+                alignment: Alignment.bottomRight,
+                padding: const EdgeInsets.all(24),
+                child: Text(
+                  _logic.display,
+                  style: const TextStyle(
+                    fontSize: 64,
+                    fontWeight: FontWeight.w300,
+                    color: Colors.white,
+                  ),
+                  maxLines: 1,
+                  overflow: TextOverflow.ellipsis,
+                ),
+              ),
+            ),
+            _buildButtonRow(['C', '+/-', '%', '/']),
+            _buildButtonRow(['7', '8', '9', '*']),
+            _buildButtonRow(['4', '5', '6', '-']),
+            _buildButtonRow(['1', '2', '3', '+']),
+            _buildButtonRow(['0', '.', '=']),
+            const SizedBox(height: 8),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildButtonRow(List<String> labels) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+      child: Row(
+        children: labels.map((label) {
+          final isWide = label == '0' && labels.length == 3;
+          return Expanded(
+            flex: isWide ? 2 : 1,
+            child: Padding(
+              padding: const EdgeInsets.all(4),
+              child: _CalcButton(
+                label: label,
+                onPressed: () => _onPressed(label),
+                color: _buttonColor(label),
+                textColor: _textColor(label),
+              ),
+            ),
+          );
+        }).toList(),
+      ),
+    );
+  }
+
+  Color _buttonColor(String label) {
+    if (['+', '-', '*', '/', '='].contains(label)) return Colors.orange;
+    if (['C', '+/-', '%'].contains(label)) return Colors.grey.shade700;
+    return Colors.grey.shade900;
+  }
+
+  Color _textColor(String label) {
+    if (['C', '+/-', '%'].contains(label)) return Colors.black;
+    return Colors.white;
+  }
+}
+
+class _CalcButton extends StatelessWidget {
+  final String label;
+  final VoidCallback onPressed;
+  final Color color;
+  final Color textColor;
+
+  const _CalcButton({
+    required this.label,
+    required this.onPressed,
+    required this.color,
+    required this.textColor,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ElevatedButton(
+      onPressed: onPressed,
+      style: ElevatedButton.styleFrom(
+        backgroundColor: color,
+        foregroundColor: textColor,
+        padding: const EdgeInsets.all(20),
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(16),
+        ),
+      ),
+      child: Text(
+        label,
+        style: const TextStyle(fontSize: 28, fontWeight: FontWeight.w400),
+      ),
+    );
+  }
+}