feat: 首页交互的

src/utils/discoveryPanelScroll.js

@@ -0,0 +1,42 @@
+export const getDiscoveryPanelCollapseState = ({
+  currentScrollTop = 0,
+  lastScrollTop = 0,
+  isCollapsed = false,
+  threshold = 16,
+  directionThreshold = 2,
+  allowExpand = true,
+}) => {
+  const current = Math.max(Number(currentScrollTop) || 0, 0);
+  const last = Math.max(Number(lastScrollTop) || 0, 0);
+  const delta = current - last;
+
+  if (delta > directionThreshold && current > threshold) {
+    return true;
+  }
+
+  if (allowExpand && delta < -directionThreshold) {
+    return false;
+  }
+
+  return isCollapsed;
+};
+
+export const canExpandDiscoveryPanelFromScroll = ({
+  isTouching = false,
+  touchDirection = "",
+  lastDownGestureAt = 0,
+  now = Date.now(),
+  gestureRetainMs = 800,
+}) => {
+  if (isTouching) {
+    return touchDirection === "down";
+  }
+
+  const lastDownAt = Math.max(Number(lastDownGestureAt) || 0, 0);
+  if (!lastDownAt) {
+    return false;
+  }
+
+  const currentTime = Math.max(Number(now) || 0, 0);
+  return currentTime - lastDownAt <= gestureRetainMs;
+};