BMI calculator example (#130)

bmi_calculator/lib/result/result_content_widget.dart

@@ -0,0 +1,79 @@
+import 'package:flutter/material.dart';
+
+import '../palette.dart';
+
+class ResultContentWidget extends StatelessWidget {
+  const ResultContentWidget({
+    super.key,
+    required this.result,
+  });
+
+  final double result;
+
+  Color resultColor() {
+    if (result < 18.5) {
+      return Palette.underweightResult;
+    } else if (result > 25) {
+      return Palette.overWeightResult;
+    } else {
+      return Palette.normalResult;
+    }
+  }
+
+  String diagnosis() {
+    if (result < 18.5) {
+      return 'UNDERWEIGHT';
+    } else if (result > 25) {
+      return 'OVERWEIGHT';
+    } else {
+      return 'NORMAL';
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+      children: [
+        Text(
+          diagnosis(),
+          style: TextStyle(
+            color: resultColor(),
+            fontWeight: FontWeight.w600,
+            fontSize: 25,
+          ),
+        ),
+        Text(
+          // [toStringAsFixed] for decimal-point string-representation
+          result.toStringAsFixed(1),
+          style: const TextStyle(
+            color: Palette.textActive,
+            fontWeight: FontWeight.w600,
+            fontSize: 100,
+          ),
+        ),
+        const Column(
+          children: [
+            Text(
+              'Normal BMI range:',
+              style: TextStyle(
+                color: Palette.textInactive,
+                fontWeight: FontWeight.w500,
+                fontSize: 20,
+              ),
+            ),
+            SizedBox(height: 8),
+            Text(
+              '18.5 - 25 kg/m2',
+              style: TextStyle(
+                color: Palette.textActive,
+                fontWeight: FontWeight.w500,
+                fontSize: 20,
+              ),
+            ),
+          ],
+        ),
+      ],
+    );
+  }
+}