preact-arco-design/es/Tree/node.js

Arco Design React UI Library.

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import React, { forwardRef, useContext, useRef, useState, useCallback } from "preact/compat";
import Checkbox from "../Checkbox";
import cs from "../_util/classNames";
import { isFunction } from "../_util/is";
import IconCaretDown from "../../icon/react-icon/IconCaretDown";
import IconDragDotVertical from "../../icon/react-icon/IconDragDotVertical";
import IconLoading from "../../icon/react-icon/IconLoading";
import IconFile from "../../icon/react-icon/IconFile";
import { ConfigContext } from "../ConfigProvider";
import IconHover from "../_class/icon-hover";
import { TreeContext } from "./context";
import AnimationNode from "./animation";
import throttleByRaf from "../_util/throttleByRaf";

function TreeNode(props, ref) {
  var _a, _b, _c;

  var _this = this;

  var treeContext = useContext(TreeContext);
  var getPrefixCls = useContext(ConfigContext).getPrefixCls; // const prevProps: NodeProps = usePrevious(props) || {};

  var nodeTitleRef = useRef();

  var _d = __read(useState({
    isAllowDrop: true,
    isDragOver: false,
    dragPosition: 0,
    isDragging: false
  }), 2),
      state = _d[0],
      setState = _d[1];

  var _e = props._key,
      _key = _e === void 0 ? '' : _e,
      title = props.title,
      icon = props.icon,
      checkable = props.checkable,
      selected = props.selected,
      disabled = props.disabled,
      disableCheckbox = props.disableCheckbox,
      isLeaf = props.isLeaf,
      draggable = props.draggable,
      expanded = props.expanded,
      showLine = props.showLine,
      loading = props.loading,
      _f = props.selectable,
      selectable = _f === void 0 ? true : _f;

  var prefixCls = getPrefixCls('tree-node');
  var classNames = cs(prefixCls, (_a = {}, _a["".concat(prefixCls, "-selected")] = selected, _a["".concat(prefixCls, "-is-leaf")] = isLeaf, _a["".concat(prefixCls, "-expanded")] = expanded, _a["".concat(prefixCls, "-disabled-selectable")] = !selectable, _a["".concat(prefixCls, "-disabled")] = disabled, _a["".concat(prefixCls, "-draggable")] = draggable, _a), props.className);

  var icons = function () {
    var treeIcons = isFunction(treeContext.icons) ? treeContext.icons(props) : treeContext.icons;
    var propsIcons = isFunction(props.icons) ? props.icons(props) : props.icons;
    return __assign(__assign({}, treeIcons), propsIcons);
  }();

  var setExpand = useCallback(function (newExpand) {
    if (newExpand === expanded) {
      return;
    }

    treeContext.onExpand && treeContext.onExpand(newExpand, _key);
  }, [expanded, treeContext.onExpand]);
  var switchExpandStatus = useCallback(function () {
    return __awaiter(_this, void 0, void 0, function () {
      var isLeaf, expanded;

      var _a;

      return __generator(this, function (_b) {
        switch (_b.label) {
          case 0:
            isLeaf = props.isLeaf, expanded = props.expanded;

            if (isLeaf) {
              return [2
              /*return*/
              ];
            }

            if (!(!((_a = props.childrenData) === null || _a === void 0 ? void 0 : _a.length) && isFunction(treeContext.loadMore) && !expanded)) return [3
            /*break*/
            , 2];
            return [4
            /*yield*/
            , treeContext.loadMore(props)];

          case 1:
            _b.sent();

            return [3
            /*break*/
            , 3];

          case 2:
            setExpand(!expanded);
            _b.label = 3;

          case 3:
            return [2
            /*return*/
            ];
        }
      });
    });
  }, [props, setExpand, treeContext.loadMore]);

  var getPrefixIcon = function getPrefixIcon() {
    if (loading) {
      return 'loadingIcon' in icons ? icons.loadingIcon : React.createElement(IconLoading, null);
    }

    var icon = null;
    var needIconHover = false;

    if (!isLeaf) {
      var defaultIcon = showLine ? React.createElement("span", {
        className: "".concat(prefixCls, "-").concat(expanded ? 'minus' : 'plus', "-icon")
      }) : React.createElement(IconCaretDown, null);
      icon = 'switcherIcon' in icons ? icons.switcherIcon : defaultIcon;
      needIconHover = !showLine;
    } else if (showLine) {
      icon = 'switcherIcon' in icons ? icons.switcherIcon : React.createElement(IconFile, null);
      needIconHover = true;
    }

    if (icon) {
      icon = React.createElement("span", {
        className: "".concat(prefixCls, "-switcher-icon"),
        "aria-label": expanded ? 'fold button' : 'expand button',
        role: "button",
        tabIndex: 0,
        onClick: switchExpandStatus
      }, icon);
      return needIconHover ? React.createElement(IconHover, {
        prefix: prefixCls
      }, icon) : icon;
    }
  };

  var updateDragOverState = useCallback(throttleByRaf(function (e) {
    var dom = nodeTitleRef.current;
    if (!dom) return;
    var rect = dom.getBoundingClientRect();
    var offsetY = window.pageYOffset + rect.top;
    var pageY = e.pageY;
    var gapHeight = rect.height / 4;
    var diff = pageY - offsetY;
    var position = diff < gapHeight ? -1 : diff < rect.height - gapHeight ? 0 : 1;
    var isAllowDrop = treeContext.allowDrop(props, position);
    setState(__assign(__assign({}, state), {
      isAllowDrop: isAllowDrop,
      isDragOver: true,
      dragPosition: position
    }));
    treeContext.onNodeDragOver && treeContext.onNodeDragOver(e, props, position);
  }), [treeContext.onNodeDragOver]);

  var handleCheck = function handleCheck(checked, e) {
    var disableCheckbox = props.disableCheckbox,
        disabled = props.disabled;

    if (disableCheckbox || disabled) {
      return;
    }

    treeContext.onCheck && treeContext.onCheck(checked, _key, e);
  };

  return React.createElement(React.Fragment, null, React.createElement("div", {
    style: props.style,
    className: classNames,
    ref: ref,
    role: "treeitem",
    "aria-disabled": disabled,
    "aria-expanded": expanded
  }, React.createElement("span", {
    className: "".concat(prefixCls, "-indent"),
    "aria-hidden": true
  }, __spreadArray([], __read(Array(props._level)), false).map(function (_, i) {
    var _a;

    return React.createElement("span", {
      className: cs("".concat(prefixCls, "-indent-block"), (_a = {}, _a["".concat(prefixCls, "-indent-block-lineless")] = props._lineless && props._lineless[i], _a)),
      key: i
    });
  })), React.createElement("span", {
    className: cs("".concat(prefixCls, "-switcher"), (_b = {}, _b["".concat(prefixCls, "-switcher-expanded")] = expanded, _b))
  }, getPrefixIcon()), checkable ? React.createElement(Checkbox, {
    disabled: disableCheckbox || disabled,
    value: _key,
    indeterminate: props.indeterminated,
    checked: props.checked,
    onChange: handleCheck
  }) : null, React.createElement("span", {
    "aria-grabbed": state.isDragging,
    ref: nodeTitleRef,
    className: cs("".concat(prefixCls, "-title"), (_c = {}, _c["".concat(prefixCls, "-title-draggable")] = draggable, _c["".concat(prefixCls, "-title-gap-top")] = state.isDragOver && state.isAllowDrop && state.dragPosition < 0, _c["".concat(prefixCls, "-title-gap-bottom")] = state.isDragOver && state.isAllowDrop && state.dragPosition > 0, _c["".concat(prefixCls, "-title-highlight")] = !state.isDragging && state.isDragOver && state.isAllowDrop && state.dragPosition === 0, _c["".concat(prefixCls, "-title-dragging")] = state.isDragging, _c["".concat(prefixCls, "-title-block")] = props.blockNode, _c)),
    onClick: function onClick(e) {
      var onSelect = treeContext.onSelect,
          actionOnClick = treeContext.actionOnClick;

      if (!props.disabled) {
        var actions = [].concat(actionOnClick);

        if (selectable && actions.indexOf('select') > -1) {
          onSelect && onSelect(_key, e);
        }

        if (actions.indexOf('expand') > -1) {
          switchExpandStatus();
        }

        if (checkable && actions.indexOf('check') > -1) {
          handleCheck(!props.checked, e);
        }
      }
    },
    draggable: draggable,
    onDrop: function onDrop(e) {
      e.stopPropagation();
      e.preventDefault();
      treeContext.onNodeDrop && treeContext.onNodeDrop(e, props, state.dragPosition);
      updateDragOverState.cancel();
      setState(__assign(__assign({}, state), {
        isDragOver: false,
        dragPosition: 0
      }));
    },
    onDragStart: function onDragStart(e) {
      if (!draggable) return;
      e.stopPropagation(); // 当前节点正在被拖拽

      setState(__assign(__assign({}, state), {
        isDragging: true
      }));
      treeContext.onNodeDragStart && treeContext.onNodeDragStart(e, props);

      try {
        // ie throw error
        // firefox-need-it
        e.dataTransfer.setData('text/plain', '');
      } catch (error) {// empty
      }
    },
    onDragEnd: function onDragEnd(e) {
      if (!draggable) return;
      e.stopPropagation();
      updateDragOverState.cancel();
      setState(__assign(__assign({}, state), {
        isDragOver: false,
        isDragging: false
      }));
      treeContext.onNodeDragEnd && treeContext.onNodeDragEnd(e, props);
    },
    onDragOver: function onDragOver(e) {
      e.preventDefault();
      e.stopPropagation();
      e.persist();
      updateDragOverState(e);
    },
    onDragLeave: function onDragLeave(e) {
      if (!draggable) return;
      e.stopPropagation();
      updateDragOverState.cancel();
      setState(__assign(__assign({}, state), {
        isDragOver: false
      }));
      treeContext.onNodeDragLeave && treeContext.onNodeDragLeave(e, props);
    }
  }, icon && React.createElement("span", {
    className: "".concat(prefixCls, "-icon ").concat(prefixCls, "-custom-icon")
  }, icon), React.createElement("span", {
    className: "".concat(prefixCls, "-title-text")
  }, isFunction(treeContext.renderTitle) ? treeContext.renderTitle(props) : title), draggable && React.createElement("span", {
    className: "".concat(prefixCls, "-icon ").concat(prefixCls, "-drag-icon")
  }, 'dragIcon' in icons ? icons.dragIcon : React.createElement(IconDragDotVertical, null))), isFunction(treeContext.renderExtra) && treeContext.renderExtra(props)), React.createElement(AnimationNode, __assign({}, props)));
}

var TreeNodeComponent = forwardRef(TreeNode);
TreeNodeComponent.displayName = 'TreeNode';
export default React.memo(TreeNodeComponent);