Latest updates from IceHrmPro

web/node_modules/rc-virtual-list/lib/utils/itemUtil.js

@@ -0,0 +1,187 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.alignScrollTop = alignScrollTop;
+exports.getScrollPercentage = getScrollPercentage;
+exports.getElementScrollPercentage = getElementScrollPercentage;
+exports.getNodeHeight = getNodeHeight;
+exports.getRangeIndex = getRangeIndex;
+exports.getItemRelativeTop = getItemRelativeTop;
+exports.getItemAbsoluteTop = getItemAbsoluteTop;
+exports.getCompareItemRelativeTop = getCompareItemRelativeTop;
+exports.requireVirtual = requireVirtual;
+exports.GHOST_ITEM_KEY = void 0;
+
+var _findDOMNode = _interopRequireDefault(require("rc-util/lib/Dom/findDOMNode"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _objectWithoutProperties(source, excluded) { if (source == null) return {}; var target = _objectWithoutPropertiesLoose(source, excluded); var key, i; if (Object.getOwnPropertySymbols) { var sourceSymbolKeys = Object.getOwnPropertySymbols(source); for (i = 0; i < sourceSymbolKeys.length; i++) { key = sourceSymbolKeys[i]; if (excluded.indexOf(key) >= 0) continue; if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue; target[key] = source[key]; } } return target; }
+
+function _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys[i]; if (excluded.indexOf(key) >= 0) continue; target[key] = source[key]; } return target; }
+
+/**
+ * Our algorithm have additional one ghost item
+ * whose index as `data.length` to simplify the calculation
+ */
+var GHOST_ITEM_KEY = '__rc_ghost_item__';
+/**
+ * Get location item and its align percentage with the scroll percentage.
+ * We should measure current scroll position to decide which item is the location item.
+ * And then fill the top count and bottom count with the base of location item.
+ *
+ * `total` should be the real count instead of `total - 1` in calculation.
+ */
+
+exports.GHOST_ITEM_KEY = GHOST_ITEM_KEY;
+
+function getLocationItem(scrollPtg, total) {
+  var itemIndex = Math.floor(scrollPtg * total);
+  var itemTopPtg = itemIndex / total;
+  var itemBottomPtg = (itemIndex + 1) / total;
+  var itemOffsetPtg = (scrollPtg - itemTopPtg) / (itemBottomPtg - itemTopPtg);
+  return {
+    index: itemIndex,
+    offsetPtg: itemOffsetPtg
+  };
+}
+/**
+ * Safari has the elasticity effect which provides negative `scrollTop` value.
+ * We should ignore it since will make scroll animation shake.
+ */
+
+
+function alignScrollTop(scrollTop, scrollRange) {
+  if (scrollTop < 0) {
+    return 0;
+  }
+
+  if (scrollTop >= scrollRange) {
+    return scrollRange;
+  }
+
+  return scrollTop;
+}
+
+function getScrollPercentage(_ref) {
+  var scrollTop = _ref.scrollTop,
+      scrollHeight = _ref.scrollHeight,
+      clientHeight = _ref.clientHeight;
+
+  if (scrollHeight <= clientHeight) {
+    return 0;
+  }
+
+  var scrollRange = scrollHeight - clientHeight;
+  var alignedScrollTop = alignScrollTop(scrollTop, scrollRange);
+  var scrollTopPtg = alignedScrollTop / scrollRange;
+  return scrollTopPtg;
+}
+
+function getElementScrollPercentage(element) {
+  if (!element) {
+    return 0;
+  }
+
+  return getScrollPercentage(element);
+}
+/**
+ * Get node `offsetHeight`. We prefer node is a dom element directly.
+ * But if not provided, downgrade to `findDOMNode` to get the real dom element.
+ */
+
+
+function getNodeHeight(node) {
+  var element = (0, _findDOMNode.default)(node);
+  return element ? element.offsetHeight : 0;
+}
+/**
+ * Get display items start, end, located item index. This is pure math calculation
+ */
+
+
+function getRangeIndex(scrollPtg, itemCount, visibleCount) {
+  var _getLocationItem = getLocationItem(scrollPtg, itemCount),
+      index = _getLocationItem.index,
+      offsetPtg = _getLocationItem.offsetPtg;
+
+  var beforeCount = Math.ceil(scrollPtg * visibleCount);
+  var afterCount = Math.ceil((1 - scrollPtg) * visibleCount);
+  return {
+    itemIndex: index,
+    itemOffsetPtg: offsetPtg,
+    startIndex: Math.max(0, index - beforeCount),
+    endIndex: Math.min(itemCount - 1, index + afterCount)
+  };
+}
+/**
+ * Calculate the located item related top with current window height
+ */
+
+
+function getItemRelativeTop(_ref2) {
+  var itemIndex = _ref2.itemIndex,
+      itemOffsetPtg = _ref2.itemOffsetPtg,
+      itemElementHeights = _ref2.itemElementHeights,
+      scrollPtg = _ref2.scrollPtg,
+      clientHeight = _ref2.clientHeight,
+      getItemKey = _ref2.getItemKey;
+  var locatedItemHeight = itemElementHeights[getItemKey(itemIndex)] || 0;
+  var locatedItemTop = scrollPtg * clientHeight;
+  var locatedItemOffset = itemOffsetPtg * locatedItemHeight;
+  return Math.floor(locatedItemTop - locatedItemOffset);
+}
+/**
+ * Calculate the located item absolute top with whole scroll height
+ */
+
+
+function getItemAbsoluteTop(_ref3) {
+  var scrollTop = _ref3.scrollTop,
+      rest = _objectWithoutProperties(_ref3, ["scrollTop"]);
+
+  return scrollTop + getItemRelativeTop(rest);
+}
+
+function getCompareItemRelativeTop(_ref4) {
+  var locatedItemRelativeTop = _ref4.locatedItemRelativeTop,
+      locatedItemIndex = _ref4.locatedItemIndex,
+      compareItemIndex = _ref4.compareItemIndex,
+      startIndex = _ref4.startIndex,
+      endIndex = _ref4.endIndex,
+      getItemKey = _ref4.getItemKey,
+      itemElementHeights = _ref4.itemElementHeights;
+  var originCompareItemTop = locatedItemRelativeTop;
+  var compareItemKey = getItemKey(compareItemIndex);
+
+  if (compareItemIndex <= locatedItemIndex) {
+    for (var index = locatedItemIndex; index >= startIndex; index -= 1) {
+      var key = getItemKey(index);
+
+      if (key === compareItemKey) {
+        break;
+      }
+
+      var prevItemKey = getItemKey(index - 1);
+      originCompareItemTop -= itemElementHeights[prevItemKey] || 0;
+    }
+  } else {
+    for (var _index = locatedItemIndex; _index <= endIndex; _index += 1) {
+      var _key = getItemKey(_index);
+
+      if (_key === compareItemKey) {
+        break;
+      }
+
+      originCompareItemTop += itemElementHeights[_key] || 0;
+    }
+  }
+
+  return originCompareItemTop;
+}
+
+function requireVirtual(height, itemHeight, count, virtual) {
+  return virtual !== false && typeof height === 'number' && count * itemHeight > height;
+}