feat: deliver RSchedule service login exams and elastic glass navigation

2026-10-13 17:06:50 +08:00
parent 9193fd8e43
commit 8f20a341c4
35 changed files with 1742 additions and 453 deletions
@@ -0,0 +1,78 @@
+import 'package:flutter/material.dart';
+
+/// Retains all tab states and scroll positions, with no page-swipe recognizer.
+class TabDeck extends StatefulWidget {
+  const TabDeck({super.key, required this.index, required this.children});
+  final int index;
+  final List<Widget> children;
+  @override
+  State<TabDeck> createState() => _TabDeckState();
+}
+
+class _TabDeckState extends State<TabDeck> with SingleTickerProviderStateMixin {
+  late final AnimationController _motion = AnimationController(
+    vsync: this,
+    duration: const Duration(milliseconds: 330),
+    value: 1,
+  );
+  int? _outgoing;
+  int _direction = 1;
+  @override
+  void didUpdateWidget(TabDeck oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.index != widget.index) {
+      _outgoing = oldWidget.index;
+      _direction = widget.index > oldWidget.index ? 1 : -1;
+      if (MediaQuery.disableAnimationsOf(context)) {
+        _motion.value = 1;
+      } else {
+        _motion.forward(from: 0);
+      }
+    }
+  }
+
+  @override
+  void dispose() {
+    _motion.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) => AnimatedBuilder(
+    animation: _motion,
+    builder: (context, _) {
+      final t = Curves.easeOutCubic.transform(_motion.value);
+      return Stack(
+        fit: StackFit.expand,
+        children: [
+          for (var i = 0; i < widget.children.length; i++)
+            Offstage(
+              offstage:
+                  i != widget.index && (i != _outgoing || _motion.isCompleted),
+              child: TickerMode(
+                enabled: i == widget.index,
+                child: IgnorePointer(
+                  ignoring: i != widget.index,
+                  child: ExcludeSemantics(
+                    excluding: i != widget.index,
+                    child: Opacity(
+                      opacity: i == widget.index
+                          ? t
+                          : (i == _outgoing ? 1 - t : 0),
+                      child: Transform.translate(
+                        offset: Offset(
+                          (i == widget.index ? 1 - t : -t) * 22 * _direction,
+                          0,
+                        ),
+                        child: widget.children[i],
+                      ),
+                    ),
+                  ),
+                ),
+              ),
+            ),
+        ],
+      );
+    },
+  );
+}