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frontend/node_modules/rc-virtual-list/es/hooks/useScrollTo.js

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+import _typeof from "@babel/runtime/helpers/esm/typeof";
+import _objectSpread from "@babel/runtime/helpers/esm/objectSpread2";
+import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
+/* eslint-disable no-param-reassign */
+import * as React from 'react';
+import raf from "rc-util/es/raf";
+import useLayoutEffect from "rc-util/es/hooks/useLayoutEffect";
+import { warning } from 'rc-util';
+var MAX_TIMES = 10;
+export default function useScrollTo(containerRef, data, heights, itemHeight, getKey, collectHeight, syncScrollTop, triggerFlash) {
+  var scrollRef = React.useRef();
+  var _React$useState = React.useState(null),
+    _React$useState2 = _slicedToArray(_React$useState, 2),
+    syncState = _React$useState2[0],
+    setSyncState = _React$useState2[1];
+
+  // ========================== Sync Scroll ==========================
+  useLayoutEffect(function () {
+    if (syncState && syncState.times < MAX_TIMES) {
+      // Never reach
+      if (!containerRef.current) {
+        setSyncState(function (ori) {
+          return _objectSpread({}, ori);
+        });
+        return;
+      }
+      collectHeight();
+      var targetAlign = syncState.targetAlign,
+        originAlign = syncState.originAlign,
+        index = syncState.index,
+        offset = syncState.offset;
+      var height = containerRef.current.clientHeight;
+      var needCollectHeight = false;
+      var newTargetAlign = targetAlign;
+      var targetTop = null;
+
+      // Go to next frame if height not exist
+      if (height) {
+        var mergedAlign = targetAlign || originAlign;
+
+        // Get top & bottom
+        var stackTop = 0;
+        var itemTop = 0;
+        var itemBottom = 0;
+        var maxLen = Math.min(data.length - 1, index);
+        for (var i = 0; i <= maxLen; i += 1) {
+          var key = getKey(data[i]);
+          itemTop = stackTop;
+          var cacheHeight = heights.get(key);
+          itemBottom = itemTop + (cacheHeight === undefined ? itemHeight : cacheHeight);
+          stackTop = itemBottom;
+        }
+
+        // Check if need sync height (visible range has item not record height)
+        var leftHeight = mergedAlign === 'top' ? offset : height - offset;
+        for (var _i = maxLen; _i >= 0; _i -= 1) {
+          var _key = getKey(data[_i]);
+          var _cacheHeight = heights.get(_key);
+          if (_cacheHeight === undefined) {
+            needCollectHeight = true;
+            break;
+          }
+          leftHeight -= _cacheHeight;
+          if (leftHeight <= 0) {
+            break;
+          }
+        }
+
+        // Scroll to
+        switch (mergedAlign) {
+          case 'top':
+            targetTop = itemTop - offset;
+            break;
+          case 'bottom':
+            targetTop = itemBottom - height + offset;
+            break;
+          default:
+            {
+              var scrollTop = containerRef.current.scrollTop;
+              var scrollBottom = scrollTop + height;
+              if (itemTop < scrollTop) {
+                newTargetAlign = 'top';
+              } else if (itemBottom > scrollBottom) {
+                newTargetAlign = 'bottom';
+              }
+            }
+        }
+        if (targetTop !== null) {
+          syncScrollTop(targetTop);
+        }
+
+        // One more time for sync
+        if (targetTop !== syncState.lastTop) {
+          needCollectHeight = true;
+        }
+      }
+
+      // Trigger next effect
+      if (needCollectHeight) {
+        setSyncState(_objectSpread(_objectSpread({}, syncState), {}, {
+          times: syncState.times + 1,
+          targetAlign: newTargetAlign,
+          lastTop: targetTop
+        }));
+      }
+    } else if (process.env.NODE_ENV !== 'production' && (syncState === null || syncState === void 0 ? void 0 : syncState.times) === MAX_TIMES) {
+      warning(false, 'Seems `scrollTo` with `rc-virtual-list` reach the max limitation. Please fire issue for us. Thanks.');
+    }
+  }, [syncState, containerRef.current]);
+
+  // =========================== Scroll To ===========================
+  return function (arg) {
+    // When not argument provided, we think dev may want to show the scrollbar
+    if (arg === null || arg === undefined) {
+      triggerFlash();
+      return;
+    }
+
+    // Normal scroll logic
+    raf.cancel(scrollRef.current);
+    if (typeof arg === 'number') {
+      syncScrollTop(arg);
+    } else if (arg && _typeof(arg) === 'object') {
+      var index;
+      var align = arg.align;
+      if ('index' in arg) {
+        index = arg.index;
+      } else {
+        index = data.findIndex(function (item) {
+          return getKey(item) === arg.key;
+        });
+      }
+      var _arg$offset = arg.offset,
+        offset = _arg$offset === void 0 ? 0 : _arg$offset;
+      setSyncState({
+        times: 0,
+        index: index,
+        offset: offset,
+        originAlign: align
+      });
+    }
+  };
+}