keyboard focus + app_info

lib/builder.dart

@@ -0,0 +1,35 @@
+import 'dart:async';
+
+import 'package:build/build.dart';
+
+Builder appInfoBuilder(BuilderOptions options) => _AppInfoBuilder();
+
+class _AppInfoBuilder implements Builder {
+  @override
+  Map<String, List<String>> get buildExtensions => const {
+        r'$package$': ['lib/app_info.g.dart'],
+      };
+
+  @override
+  Future<void> build(BuildStep buildStep) async {
+    final pkg = buildStep.inputId.package;
+    final raw = await buildStep.readAsString(AssetId(pkg, 'pubspec.yaml'));
+    final match =
+        RegExp(r'^version:\s*([^\s#]+)', multiLine: true).firstMatch(raw);
+    final combined = match?.group(1) ?? '0.0.0+0';
+    final plus = combined.indexOf('+');
+    final version = plus < 0 ? combined : combined.substring(0, plus);
+    final buildNumber =
+        plus < 0 ? 0 : int.tryParse(combined.substring(plus + 1)) ?? 0;
+
+    await buildStep.writeAsString(
+      AssetId(pkg, 'lib/app_info.g.dart'),
+      '''
+// GENERATED by build_runner from pubspec.yaml — do not edit.
+import 'package:ux/ux.dart';
+
+const kAppInfo = AppInfo(version: '$version', buildNumber: $buildNumber);
+''',
+    );
+  }
+}

lib/src/app_info.dart

@@ -0,0 +1,5 @@
+class AppInfo {
+  final String version;
+  final int buildNumber;
+  const AppInfo({required this.version, required this.buildNumber});
+}

lib/src/keyboard.dart

@@ -4,6 +4,7 @@ import 'dart:math' as math;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/scheduler.dart';
+import 'package:flutter/services.dart';
 
 DynamicLibrary? _initLib() {
   if (Platform.isIOS) return DynamicLibrary.process();
@@ -141,6 +142,9 @@ double _inverseLerp(List<double> samples, double value) {
 /// ```
 class UxKeyboard with ChangeNotifier {
   UxKeyboard._() {
+    if (Platform.isAndroid) {
+      _channel.setMethodCallHandler(_onMethodCall);
+    }
     if (_lib == null) return;
     SchedulerBinding.instance.addPersistentFrameCallback(_onFrame);
   }
@@ -148,6 +152,26 @@ class UxKeyboard with ChangeNotifier {
   /// The singleton instance.
   static final UxKeyboard instance = UxKeyboard._();
 
+  static const _channel = MethodChannel('ux/keyboard');
+
+  /// Increments each time the native window gains input focus — the signal
+  /// Android needs before the IME can be raised. Listen for changes when you
+  /// want to re-trigger a pending focus request at cold start (e.g. a
+  /// `TextField(autofocus: true)` whose initial `TextInput.show` was dropped
+  /// because the window wasn't yet focused).
+  ///
+  /// The value itself is a monotonically-increasing counter — only useful as a
+  /// change signal, not as an absolute state.
+  final windowFocusCounter = ValueNotifier<int>(0);
+
+  Future<dynamic> _onMethodCall(MethodCall call) async {
+    switch (call.method) {
+      case 'onWindowFocused':
+        windowFocusCounter.value++;
+        break;
+    }
+  }
+
   double _height = 0;
 
   /// The current keyboard height in logical pixels.

lib/ux.dart

@@ -4,6 +4,7 @@
 /// [BendBox] for curved layout painting, and bezier curve utilities.
 library;
 
+export 'src/app_info.dart';
 export 'src/bend_box.dart';
 export 'src/json_extension.dart';
 export 'src/bezier.dart';