@instructure/quiz-interactions/lib/components/hotspot/common/Canvas/index.js

A React UI component Library for quiz interaction types.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
var _possibleConstructorReturn2 = _interopRequireDefault(require("@babel/runtime/helpers/possibleConstructorReturn"));
var _getPrototypeOf2 = _interopRequireDefault(require("@babel/runtime/helpers/getPrototypeOf"));
var _inherits2 = _interopRequireDefault(require("@babel/runtime/helpers/inherits"));
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _react = require("react");
var _propTypes = _interopRequireDefault(require("prop-types"));
var _pickBy = _interopRequireDefault(require("lodash/pickBy"));
var _propTypes2 = _interopRequireWildcard(require("./propTypes"));
var _emotion = require("@instructure/emotion");
var _theme = _interopRequireDefault(require("./theme"));
var _styles = _interopRequireDefault(require("./styles"));
var _quizCommon = require("@instructure/quiz-common");
var _dec, _class, _Canvas;
/** @jsx jsx */
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) { symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); } keys.push.apply(keys, symbols); } return keys; }
function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { (0, _defineProperty2["default"])(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
function _callSuper(_this, derived, args) {
  function isNativeReflectConstruct() {
    if (typeof Reflect === "undefined" || !Reflect.construct) return false;
    if (Reflect.construct.sham) return false;
    if (typeof Proxy === "function") return true;
    try {
      return !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {}));
    } catch (e) {
      return false;
    }
  }
  derived = (0, _getPrototypeOf2["default"])(derived);
  return (0, _possibleConstructorReturn2["default"])(_this, isNativeReflectConstruct() ? Reflect.construct(derived, args || [], (0, _getPrototypeOf2["default"])(_this).constructor) : derived.apply(_this, args));
}
var Canvas = exports["default"] = (_dec = (0, _quizCommon.withStyleOverrides)(_styles["default"], _theme["default"]), _dec(_class = (_Canvas = /*#__PURE__*/function (_Component) {
  function Canvas(props) {
    var _this2;
    (0, _classCallCheck2["default"])(this, Canvas);
    _this2 = _callSuper(this, Canvas, [props]);
    // these handlers shouldn't change, so set them once per initialization
    (0, _defineProperty2["default"])(_this2, "state", {
      isDrawing: false
    });
    (0, _defineProperty2["default"])(_this2, "refCanvas", function (node) {
      _this2.canvasElement = node;
    });
    // ===========
    //   ACTIONS
    // ===========
    (0, _defineProperty2["default"])(_this2, "drawShape", function (coordinates) {
      _this2.clearCanvas();
      _this2.props.drawShape(coordinates);
    });
    // ===========
    //   HANDLERS
    // ===========
    (0, _defineProperty2["default"])(_this2, "onMouseOut", function (e) {
      // the mouse out event is handled by default as a click/release on the exiting canvas border
      _this2.props.onMouseOut // eslint-disable-line no-unused-expressions
      ? _this2.props.onMouseOut(e) : function (e) {};
    });
    _this2.eventHandlers = _objectSpread({
      onMouseOut: _this2.onMouseOut
    }, (0, _pickBy["default"])(props, function (prop, propName) {
      return prop !== null && propName.startsWith('on');
    }));
    return _this2;
  }
  (0, _inherits2["default"])(Canvas, _Component);
  return (0, _createClass2["default"])(Canvas, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      if (this.props.realRef) {
        this.props.realRef(this);
      }
      this.drawShape(this.props.coordinates);
    }
  }, {
    key: "componentDidUpdate",
    value: function componentDidUpdate() {
      this.drawShape(this.props.coordinates);
      if (this.isDrawing()) {
        this.canvasElement.focus();
      }
    }

    // ===========
    //   HELPERS
    // ===========
  }, {
    key: "isDrawing",
    value: function isDrawing() {
      return this.state.isDrawing;
    }
  }, {
    key: "getInitialCoordinate",
    value: function getInitialCoordinate() {
      return this.props.coordinates[0];
    }
  }, {
    key: "getLastCoordinate",
    value: function getLastCoordinate() {
      return this.props.coordinates[this.props.coordinates.length - 1];
    }
  }, {
    key: "getCurrentCoordinates",
    value: function getCurrentCoordinates(e) {
      var x = e.nativeEvent.offsetX;
      var y = e.nativeEvent.offsetY;
      return {
        x: x,
        y: y
      };
    }
  }, {
    key: "convertTouchCoordinates",
    value: function convertTouchCoordinates(touchEvent) {
      var rect = this.canvasElement.getBoundingClientRect();
      var x = touchEvent.changedTouches[0].pageX - rect.left;
      var y = touchEvent.changedTouches[0].pageY - rect.top;
      var evt = {
        nativeEvent: {
          offsetX: x,
          offsetY: y
        }
      };
      return evt;
    }
  }, {
    key: "focus",
    value: function focus() {
      this.canvasElement.focus();
    }
  }, {
    key: "clearCanvas",
    value: function clearCanvas() {
      var ctx = this.canvasElement.getContext('2d');
      ctx.clearRect(0, 0, this.canvasElement.width, this.canvasElement.height);
    }
  }, {
    key: "setStrokeStyle",
    value: function setStrokeStyle() {
      var color = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.props.styles.shapeColor;
      var ctx = this.canvasElement.getContext('2d');
      ctx.lineWidth = 2;
      ctx.strokeStyle = color;
    }
  }, {
    key: "setFillStyle",
    value: function setFillStyle() {
      var color = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.props.styles.shapeColor;
      var ctx = this.canvasElement.getContext('2d');
      ctx.globalAlpha = 0.5;
      ctx.fillStyle = color;
    }
  }, {
    key: "startDrawing",
    value: function startDrawing(e) {
      var initialCoordinate = this.getCurrentCoordinates(e);
      this.props.handleSetCoordinates([initialCoordinate], true);
      this.setState({
        isDrawing: true
      });
    }
  }, {
    key: "stopDrawing",
    value: function stopDrawing(coordinates) {
      this.props.handleSetCoordinates(coordinates, false);
      this.setState({
        isDrawing: false
      });
    }
  }, {
    key: "renderCanvas",
    value:
    // ===========
    //   RENDER
    // ===========

    function renderCanvas() {
      if (this.props.readOnly) {
        return (0, _emotion.jsx)("canvas", {
          height: this.props.height,
          ref: this.refCanvas,
          width: this.props.width
        });
      }
      return (0, _emotion.jsx)("canvas", Object.assign({
        css: this.props.styles.canvas,
        height: this.props.height,
        ref: this.refCanvas,
        tabIndex: "0",
        width: this.props.width,
        onBlur: this.onMouseOut
      }, this.eventHandlers));
    }
  }, {
    key: "render",
    value: function render() {
      return (0, _emotion.jsx)("div", {
        css: this.props.styles.canvasWrapper
      }, this.renderCanvas());
    }
  }]);
}(_react.Component), (0, _defineProperty2["default"])(_Canvas, "displayName", 'Canvas'), (0, _defineProperty2["default"])(_Canvas, "componentId", "Quizzes".concat(_Canvas.displayName)), (0, _defineProperty2["default"])(_Canvas, "propTypes", _objectSpread(_objectSpread({}, _propTypes2["default"]), {}, {
  realRef: _propTypes["default"].func,
  drawShape: _propTypes["default"].func.isRequired,
  onMouseOut: _propTypes["default"].func,
  onMouseMove: _propTypes["default"].func,
  onDoubleClick: _propTypes["default"].func,
  onClick: _propTypes["default"].func,
  onKeyPress: _propTypes["default"].func,
  onMouseDown: _propTypes["default"].func,
  onMouseUp: _propTypes["default"].func,
  onTouchStart: _propTypes["default"].func,
  onTouchMove: _propTypes["default"].func,
  onTouchEnd: _propTypes["default"].func,
  styles: _propTypes["default"].object
})), (0, _defineProperty2["default"])(_Canvas, "defaultProps", _objectSpread({
  realRef: null,
  onMouseOut: null,
  onMouseMove: null,
  onDoubleClick: null,
  onClick: null,
  onKeyPress: null,
  onMouseDown: null,
  onMouseUp: null,
  onTouchStart: null,
  onTouchMove: null,
  onTouchEnd: null
}, _propTypes2.defaultProps)), _Canvas)) || _class);