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frontend/node_modules/rc-tabs/es/hooks/useTouchMove.js

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+import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
+import * as React from 'react';
+import { useRef, useState } from 'react';
+var MIN_SWIPE_DISTANCE = 0.1;
+var STOP_SWIPE_DISTANCE = 0.01;
+var REFRESH_INTERVAL = 20;
+var SPEED_OFF_MULTIPLE = Math.pow(0.995, REFRESH_INTERVAL);
+
+// ================================= Hook =================================
+export default function useTouchMove(ref, onOffset) {
+  var _useState = useState(),
+    _useState2 = _slicedToArray(_useState, 2),
+    touchPosition = _useState2[0],
+    setTouchPosition = _useState2[1];
+  var _useState3 = useState(0),
+    _useState4 = _slicedToArray(_useState3, 2),
+    lastTimestamp = _useState4[0],
+    setLastTimestamp = _useState4[1];
+  var _useState5 = useState(0),
+    _useState6 = _slicedToArray(_useState5, 2),
+    lastTimeDiff = _useState6[0],
+    setLastTimeDiff = _useState6[1];
+  var _useState7 = useState(),
+    _useState8 = _slicedToArray(_useState7, 2),
+    lastOffset = _useState8[0],
+    setLastOffset = _useState8[1];
+  var motionRef = useRef();
+
+  // ========================= Events =========================
+  // >>> Touch events
+  function onTouchStart(e) {
+    var _e$touches$ = e.touches[0],
+      screenX = _e$touches$.screenX,
+      screenY = _e$touches$.screenY;
+    setTouchPosition({
+      x: screenX,
+      y: screenY
+    });
+    window.clearInterval(motionRef.current);
+  }
+  function onTouchMove(e) {
+    if (!touchPosition) return;
+
+    // e.preventDefault();
+    var _e$touches$2 = e.touches[0],
+      screenX = _e$touches$2.screenX,
+      screenY = _e$touches$2.screenY;
+    setTouchPosition({
+      x: screenX,
+      y: screenY
+    });
+    var offsetX = screenX - touchPosition.x;
+    var offsetY = screenY - touchPosition.y;
+    onOffset(offsetX, offsetY);
+    var now = Date.now();
+    setLastTimestamp(now);
+    setLastTimeDiff(now - lastTimestamp);
+    setLastOffset({
+      x: offsetX,
+      y: offsetY
+    });
+  }
+  function onTouchEnd() {
+    if (!touchPosition) return;
+    setTouchPosition(null);
+    setLastOffset(null);
+
+    // Swipe if needed
+    if (lastOffset) {
+      var distanceX = lastOffset.x / lastTimeDiff;
+      var distanceY = lastOffset.y / lastTimeDiff;
+      var absX = Math.abs(distanceX);
+      var absY = Math.abs(distanceY);
+
+      // Skip swipe if low distance
+      if (Math.max(absX, absY) < MIN_SWIPE_DISTANCE) return;
+      var currentX = distanceX;
+      var currentY = distanceY;
+      motionRef.current = window.setInterval(function () {
+        if (Math.abs(currentX) < STOP_SWIPE_DISTANCE && Math.abs(currentY) < STOP_SWIPE_DISTANCE) {
+          window.clearInterval(motionRef.current);
+          return;
+        }
+        currentX *= SPEED_OFF_MULTIPLE;
+        currentY *= SPEED_OFF_MULTIPLE;
+        onOffset(currentX * REFRESH_INTERVAL, currentY * REFRESH_INTERVAL);
+      }, REFRESH_INTERVAL);
+    }
+  }
+
+  // >>> Wheel event
+  var lastWheelDirectionRef = useRef();
+  function onWheel(e) {
+    var deltaX = e.deltaX,
+      deltaY = e.deltaY;
+
+    // Convert both to x & y since wheel only happened on PC
+    var mixed = 0;
+    var absX = Math.abs(deltaX);
+    var absY = Math.abs(deltaY);
+    if (absX === absY) {
+      mixed = lastWheelDirectionRef.current === 'x' ? deltaX : deltaY;
+    } else if (absX > absY) {
+      mixed = deltaX;
+      lastWheelDirectionRef.current = 'x';
+    } else {
+      mixed = deltaY;
+      lastWheelDirectionRef.current = 'y';
+    }
+    if (onOffset(-mixed, -mixed)) {
+      e.preventDefault();
+    }
+  }
+
+  // ========================= Effect =========================
+  var touchEventsRef = useRef(null);
+  touchEventsRef.current = {
+    onTouchStart: onTouchStart,
+    onTouchMove: onTouchMove,
+    onTouchEnd: onTouchEnd,
+    onWheel: onWheel
+  };
+  React.useEffect(function () {
+    function onProxyTouchStart(e) {
+      touchEventsRef.current.onTouchStart(e);
+    }
+    function onProxyTouchMove(e) {
+      touchEventsRef.current.onTouchMove(e);
+    }
+    function onProxyTouchEnd(e) {
+      touchEventsRef.current.onTouchEnd(e);
+    }
+    function onProxyWheel(e) {
+      touchEventsRef.current.onWheel(e);
+    }
+    document.addEventListener('touchmove', onProxyTouchMove, {
+      passive: false
+    });
+    document.addEventListener('touchend', onProxyTouchEnd, {
+      passive: true
+    });
+
+    // No need to clean up since element removed
+    ref.current.addEventListener('touchstart', onProxyTouchStart, {
+      passive: true
+    });
+    ref.current.addEventListener('wheel', onProxyWheel, {
+      passive: false
+    });
+    return function () {
+      document.removeEventListener('touchmove', onProxyTouchMove);
+      document.removeEventListener('touchend', onProxyTouchEnd);
+    };
+  }, []);
+}