init

lib/shared/widgets/app_toast.dart

@@ -0,0 +1,87 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_template/app/router/app_navigator.dart';
+
+class AppToast {
+  AppToast._();
+
+  static OverlayEntry? _entry;
+  static Timer? _timer;
+
+  static String messageOf(Object? error) {
+    if (error == null) return '未知错误';
+    if (error is FormatException) return error.message;
+    if (error is TimeoutException) return error.message ?? '请求超时';
+
+    var text = error.toString().trim();
+    const prefix = 'Exception: ';
+    while (text.startsWith(prefix)) {
+      text = text.substring(prefix.length).trimLeft();
+    }
+    return text.isEmpty ? '未知错误' : text;
+  }
+
+  static void show(
+    String message, {
+    Duration duration = const Duration(seconds: 2),
+  }) {
+    final context = AppNavigator.context;
+    if (context == null) return;
+
+    _dismiss();
+    final overlay = Overlay.maybeOf(context, rootOverlay: true);
+    if (overlay == null) return;
+
+    _entry = OverlayEntry(builder: (_) => _ToastWidget(message: message));
+    overlay.insert(_entry!);
+    _timer = Timer(duration, _dismiss);
+  }
+
+  static void showError(Object error) => show(messageOf(error));
+
+  static void _dismiss() {
+    _timer?.cancel();
+    _timer = null;
+    try {
+      _entry?.remove();
+    } catch (_) {
+      // OverlayEntry may already be removed.
+    }
+    _entry = null;
+  }
+}
+
+class _ToastWidget extends StatelessWidget {
+  const _ToastWidget({required this.message});
+
+  final String message;
+
+  @override
+  Widget build(BuildContext context) {
+    return Positioned.fill(
+      child: IgnorePointer(
+        child: Center(
+          child: Material(
+            color: Colors.transparent,
+            child: Container(
+              constraints: BoxConstraints(
+                maxWidth: MediaQuery.sizeOf(context).width * 0.8,
+              ),
+              padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 11),
+              decoration: BoxDecoration(
+                color: Colors.black.withValues(alpha: 0.82),
+                borderRadius: BorderRadius.circular(8),
+              ),
+              child: Text(
+                message,
+                textAlign: TextAlign.center,
+                style: const TextStyle(color: Colors.white, fontSize: 14),
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}