react-video-annotation-tool/dist/contexts/CanvasProvider.js

A React-based video player with built-in annotation features, enabling interactive video tagging and markup for seamless media annotation workflows

function _toConsumableArray(r) { return _arrayWithoutHoles(r) || _iterableToArray(r) || _unsupportedIterableToArray(r) || _nonIterableSpread(); }
function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _iterableToArray(r) { if ("undefined" != typeof Symbol && null != r[Symbol.iterator] || null != r["@@iterator"]) return Array.from(r); }
function _arrayWithoutHoles(r) { if (Array.isArray(r)) return _arrayLikeToArray(r); }
function _slicedToArray(r, e) { return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _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(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(r) { if (Array.isArray(r)) return r; }
import React, { createContext, useCallback, useContext, useState } from "react";
var CanvasContext = /*#__PURE__*/createContext();
export var CanvasProvider = function CanvasProvider(_ref) {
  var children = _ref.children,
    shapes = _ref.shapes,
    setShapes = _ref.setShapes;
  // GENERAL STATES
  // const [shapes, setShapes] = useState(initialData || []);
  var _useState = useState(false),
    _useState2 = _slicedToArray(_useState, 2),
    isDrawing = _useState2[0],
    setIsDrawing = _useState2[1];
  var _useState3 = useState(null),
    _useState4 = _slicedToArray(_useState3, 2),
    newShape = _useState4[0],
    setNewShape = _useState4[1];
  var _useState5 = useState(null),
    _useState6 = _slicedToArray(_useState5, 2),
    selectedShapeId = _useState6[0],
    setSelectedShapeId = _useState6[1];
  var _useState7 = useState({
      x: null,
      y: null
    }),
    _useState8 = _slicedToArray(_useState7, 2),
    rectPosititon = _useState8[0],
    setRectPosition = _useState8[1];
  var _useState9 = useState(null),
    _useState10 = _slicedToArray(_useState9, 2),
    videoRefVal = _useState10[0],
    setVideoRefVal = _useState10[1];
  var _useState11 = useState({
      width: 500,
      height: 300
    }),
    _useState12 = _slicedToArray(_useState11, 2),
    dimensions = _useState12[0],
    setDimensions = _useState12[1];

  // STACK STATES
  var _useState13 = useState([]),
    _useState14 = _slicedToArray(_useState13, 2),
    history = _useState14[0],
    setHistory = _useState14[1];
  var _useState15 = useState([]),
    _useState16 = _slicedToArray(_useState15, 2),
    redoStack = _useState16[0],
    setRedoStack = _useState16[1];

  /**
  * Handle UNDO.
  */
  var undo = useCallback(function () {
    if (history.length > 0) {
      var lastState = history[history.length - 1];
      setRedoStack(function (prevRedoStack) {
        return [shapes].concat(_toConsumableArray(prevRedoStack));
      });
      setShapes(lastState);
      setHistory(function (prevHistory) {
        return prevHistory.slice(0, -1);
      });
    }
  }, [history, shapes]);

  /**
   * Handle REDO.
   */
  var redo = useCallback(function () {
    if (redoStack.length > 0) {
      var nextState = redoStack[0];
      setHistory(function (prevHistory) {
        return [].concat(_toConsumableArray(prevHistory), [shapes]);
      });
      setShapes(nextState);
      setRedoStack(function (prevRedoStack) {
        return prevRedoStack.slice(1);
      });
    }
  }, [redoStack, shapes]);

  /**
    * Handle shape deletion by filtering out the shape with the given ID.
    *
    * @param {string} shapeId - The ID of the shape to delete.
    */
  var deleteShape = useCallback(function () {
    setHistory(function (prevHistory) {
      return [].concat(_toConsumableArray(prevHistory), [shapes]);
    });
    setRedoStack([]);
    setShapes(function (prevShapes) {
      return prevShapes.filter(function (shape) {
        return shape.id !== selectedShapeId;
      });
    });
    setSelectedShapeId(null);
  }, [selectedShapeId]);
  return /*#__PURE__*/React.createElement(CanvasContext.Provider, {
    value: {
      shapes: shapes,
      setShapes: setShapes,
      isDrawing: isDrawing,
      setIsDrawing: setIsDrawing,
      newShape: newShape,
      setNewShape: setNewShape,
      selectedShapeId: selectedShapeId,
      setSelectedShapeId: setSelectedShapeId,
      rectPosititon: rectPosititon,
      setRectPosition: setRectPosition,
      videoRefVal: videoRefVal,
      setVideoRefVal: setVideoRefVal,
      dimensions: dimensions,
      setDimensions: setDimensions,
      history: history,
      setHistory: setHistory,
      redoStack: redoStack,
      setRedoStack: setRedoStack,
      deleteShape: deleteShape,
      undo: undo,
      redo: redo
    }
  }, children);
};
export var useCanvas = function useCanvas() {
  return useContext(CanvasContext);
};