planning

node_modules/react-dnd/dist/cjs/hooks/useCollector.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.useCollector = useCollector;
+
+var _fastDeepEqual = _interopRequireDefault(require("fast-deep-equal"));
+
+var _react = require("react");
+
+var _useIsomorphicLayoutEffect = require("./useIsomorphicLayoutEffect");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
+
+function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
+
+function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
+
+function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
+
+/**
+ *
+ * @param monitor The monitor to collect state from
+ * @param collect The collecting function
+ * @param onUpdate A method to invoke when updates occur
+ */
+function useCollector(monitor, collect, onUpdate) {
+  var _useState = (0, _react.useState)(function () {
+    return collect(monitor);
+  }),
+      _useState2 = _slicedToArray(_useState, 2),
+      collected = _useState2[0],
+      setCollected = _useState2[1];
+
+  var updateCollected = (0, _react.useCallback)(function () {
+    var nextValue = collect(monitor); // This needs to be a deep-equality check because some monitor-collected values
+    // include XYCoord objects that may be equivalent, but do not have instance equality.
+
+    if (!(0, _fastDeepEqual.default)(collected, nextValue)) {
+      setCollected(nextValue);
+
+      if (onUpdate) {
+        onUpdate();
+      }
+    }
+  }, [collected, monitor, onUpdate]); // update the collected properties after react renders.
+  // Note that the "Dustbin Stress Test" fails if this is not
+  // done when the component updates
+
+  (0, _useIsomorphicLayoutEffect.useIsomorphicLayoutEffect)(updateCollected);
+  return [collected, updateCollected];
+}