feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>
2026-08-13 18:34:25 +08:00
parent 61c3fa1df9
commit 9dfa06ffee
3785 changed files with 1085458 additions and 2 deletions
@@ -0,0 +1,67 @@
+import 'package:flutter/material.dart';
+
+/// Supplies a shared directional entrance to separate foreground surfaces.
+///
+/// Descendants opt in with [DirectionalTransitionMotion], which lets a page
+/// move its body and app-bar content together while leaving decorative
+/// backgrounds stationary.
+class DirectionalTransitionScope extends InheritedWidget {
+  /// Horizontal displacement remaining in the transition.
+  final double horizontalOffset;
+
+  /// Current foreground opacity, from zero to one.
+  final double opacity;
+
+  /// Creates a directional transition scope.
+  const DirectionalTransitionScope({
+    super.key,
+    required this.horizontalOffset,
+    required this.opacity,
+    required super.child,
+  });
+
+  /// Returns the closest transition, or null outside a transitioning surface.
+  static DirectionalTransitionScope? maybeOf(BuildContext context) =>
+      context.dependOnInheritedWidgetOfExactType<DirectionalTransitionScope>();
+
+  @override
+  bool updateShouldNotify(DirectionalTransitionScope oldWidget) =>
+      horizontalOffset != oldWidget.horizontalOffset ||
+      opacity != oldWidget.opacity;
+}
+
+/// Applies the nearest [DirectionalTransitionScope] to one foreground layer.
+class DirectionalTransitionMotion extends StatelessWidget {
+  /// Foreground content that participates in the shared transition.
+  final Widget child;
+
+  /// Optional key for inspecting the composited translation layer.
+  final Key? transformKey;
+
+  /// Optional key for inspecting the composited opacity layer.
+  final Key? opacityKey;
+
+  /// Creates a foreground transition participant.
+  const DirectionalTransitionMotion({
+    super.key,
+    required this.child,
+    this.transformKey,
+    this.opacityKey,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final transition = DirectionalTransitionScope.maybeOf(context);
+    if (transition == null) return child;
+
+    return Transform.translate(
+      key: transformKey,
+      offset: Offset(transition.horizontalOffset, 0),
+      child: Opacity(
+        key: opacityKey,
+        opacity: transition.opacity,
+        child: child,
+      ),
+    );
+  }
+}