opt: 图片预览

lib/plugin/pl_gallery/hero_dialog_route.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/material.dart';
+
+/// A [PageRoute] with a semi transparent background.
+///
+/// Similar to calling [showDialog] except it can be used with a [Navigator] to
+/// show a [Hero] animation.
+class HeroDialogRoute<T> extends PageRoute<T> {
+  HeroDialogRoute({
+    required this.builder,
+    this.onBackgroundTap,
+  }) : super();
+
+  final WidgetBuilder builder;
+
+  /// Called when the background is tapped.
+  final VoidCallback? onBackgroundTap;
+
+  @override
+  bool get opaque => false;
+
+  @override
+  bool get barrierDismissible => true;
+
+  @override
+  String? get barrierLabel => null;
+
+  @override
+  Duration get transitionDuration => const Duration(milliseconds: 300);
+
+  @override
+  bool get maintainState => true;
+
+  @override
+  Color? get barrierColor => null;
+
+  @override
+  Widget buildTransitions(
+    BuildContext context,
+    Animation<double> animation,
+    Animation<double> secondaryAnimation,
+    Widget child,
+  ) {
+    return FadeTransition(
+      opacity: CurvedAnimation(parent: animation, curve: Curves.easeOut),
+      child: child,
+    );
+  }
+
+  @override
+  Widget buildPage(
+    BuildContext context,
+    Animation<double> animation,
+    Animation<double> secondaryAnimation,
+  ) {
+    final Widget child = builder(context);
+    final Widget result = Semantics(
+      scopesRoute: true,
+      explicitChildNodes: true,
+      child: child,
+    );
+    return result;
+  }
+}