初始化提交

2025-09-23 16:23:15 +08:00
commit 877b18a70f
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+import 'package:get/get.dart';
+
+/// 导航栏透明度管理 Mixin
+/// 用于统一管理页面导航栏的透明度变化
+mixin KRAppBarOpacityMixin {
+  /// 导航栏透明度值
+  final RxDouble kr_appBarOpacity = 0.0.obs;
+  
+  /// 上次滚动位置
+  double _lastOffset = 0;
+  
+  /// 上次更新时间
+  double _lastUpdateTime = 0;
+  
+  /// 滚动阈值
+  static const double _scrollThreshold = 100.0;
+  
+  /// 最小透明度
+  static const double _minOpacity = 0.0;
+  
+  /// 最大透明度
+  static const double _maxOpacity = 1.0;
+  
+  /// 滚动速度因子
+  static const double _scrollSpeedFactor = 0.5;
+
+  /// 更新导航栏透明度
+  /// [scrollPixels] 当前滚动位置
+  void kr_updateAppBarOpacity(double scrollPixels) {
+    final currentTime = DateTime.now().millisecondsSinceEpoch.toDouble();
+    final deltaTime = currentTime - _lastUpdateTime;
+    _lastUpdateTime = currentTime;
+
+    // 计算滚动速度
+    final scrollDelta = scrollPixels - _lastOffset;
+    final scrollSpeed = scrollDelta.abs() / (deltaTime > 0 ? deltaTime : 1);
+    _lastOffset = scrollPixels;
+
+    // 根据滚动位置计算基础透明度
+    double baseOpacity = 0.0;
+    if (scrollPixels <= 0) {
+      baseOpacity = _minOpacity;
+    } else if (scrollPixels >= _scrollThreshold) {
+      baseOpacity = _maxOpacity;
+    } else {
+      // 使用平滑的插值函数计算透明度
+      baseOpacity = (scrollPixels / _scrollThreshold).clamp(_minOpacity, _maxOpacity);
+      // 使用平方根函数使透明度变化更加平滑
+      baseOpacity = baseOpacity * baseOpacity;
+    }
+
+    // 根据滚动速度调整透明度
+    double speedFactor = (scrollSpeed * _scrollSpeedFactor).clamp(0.0, 0.5);
+    double targetOpacity = baseOpacity + (speedFactor * 0.2); // 减小速度影响
+
+    // 平滑过渡到目标透明度
+    final currentOpacity = kr_appBarOpacity.value;
+    final opacityDelta = targetOpacity - currentOpacity;
+    final smoothFactor = 0.3; // 平滑因子，值越小过渡越平滑
+    
+    kr_appBarOpacity.value = (currentOpacity + opacityDelta * smoothFactor)
+        .clamp(_minOpacity, _maxOpacity);
+  }
+}