1 files changed, 76 insertions, 0 deletions
diff --git a/lib/profiler.dart b/lib/profiler.dart
new file mode 100755
index 0000000..495dc48
--- /dev/null
+++ b/lib/profiler.dart
@@ -0,0 +1,76 @@
+import 'package:flutter/material.dart';
+
+class ProfileScope {
+  final String name;
+  final DateTime start;
+  final DateTime end;
+
+  const ProfileScope(this.name, this.start, this.end);
+}
+
+class ProfileFrame {
+  final int id;
+  final DateTime start;
+  final DateTime end;
+  final List<ProfileScope> scopes;
+
+  const ProfileFrame(this.id, this.start, this.end, this.scopes);
+}
+
+extension DurationExt on Duration {
+  double get toSeconds => this.inMicroseconds.toDouble() / 1000000.0;
+}
+
+class ProfilerPage extends StatelessWidget {
+  final List<ProfileFrame> frames;
+
+  const ProfilerPage(this.frames, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    if (frames.isEmpty) {
+      return const Center(
+        child: Text(
+          "Run the project to see profiling information",
+          style: TextStyle(fontSize: 36),
+        ),
+      );
+    }
+
+    final frameTimes = this.frames.map((frame) => frame.end.difference(frame.start)).toList();
+    final totalFrameTime = frameTimes.reduce((a, b) => a + b);
+    final averageFrameTime = totalFrameTime.inMicroseconds / this.frames.length;
+    final averageFps = this.frames.length / totalFrameTime.toSeconds;
+
+    Duration totalFrameTimeForPreviousSecond = const Duration();
+    final List<Duration> frameTimesForPreviousSecond = [];
+    for (int i = frameTimes.length - 1; i >= 0; i--) {
+      final currentFrameTime = frameTimes[i];
+      totalFrameTimeForPreviousSecond += currentFrameTime;
+      frameTimesForPreviousSecond.add(currentFrameTime);
+
+      if (totalFrameTimeForPreviousSecond.toSeconds >= 1.0) {
+        break;
+      }
+    }
+    frameTimesForPreviousSecond.sort((a, b) => b.compareTo(a));
+    final fpsLow = 1 /
+        frameTimesForPreviousSecond[(frameTimesForPreviousSecond.length / 20).floor()].toSeconds;
+
+    return Padding(
+      padding: const EdgeInsets.all(20),
+      child: Column(
+        children: [
+          Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: [
+              Text("Average Frame Time: ${averageFrameTime.round()} μs"),
+              Text("Average FPS: ${averageFps.round()} fps"),
+              Text("Low 5% FPS: ${fpsLow.round()}"),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+}