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");

var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));

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 _react = _interopRequireWildcard(require("react"));

var _propTypes = _interopRequireDefault(require("prop-types"));

var _uiThemeable = require("@instructure/ui-themeable");

var _pickBy = _interopRequireDefault(require("lodash/pickBy"));

var _propTypes2 = _interopRequireWildcard(require("./propTypes"));

var _theme = _interopRequireDefault(require("./theme"));

var _dec, _class, _class2, _temp;

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(source, true).forEach(function (key) { (0, _defineProperty2.default)(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(source).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

var styles = {
  componentId: 'fjxel',
  template: function template(theme) {
    return "\n\n.fjxel_eVTu{left:50%;max-height:100%;max-width:100%;position:absolute;top:50%;transform:translate(-50%,-50%)}\n\n.fjxel_cjLo:hover{cursor:crosshair}";
  },
  'canvasWrapper': 'fjxel_eVTu',
  'canvas': 'fjxel_cjLo'
};
var Canvas = (_dec = (0, _uiThemeable.themeable)(_theme.default, styles), _dec(_class = (_temp = _class2 =
/*#__PURE__*/
function (_Component) {
  (0, _inherits2.default)(Canvas, _Component);

  function Canvas(props) {
    var _this;

    (0, _classCallCheck2.default)(this, Canvas);
    _this = (0, _possibleConstructorReturn2.default)(this, (0, _getPrototypeOf2.default)(Canvas).call(this, props)); // these handlers shouldn't change, so set them once per initialization

    _this.state = {
      isDrawing: false
    };

    _this.refCanvas = function (node) {
      _this.canvasElement = node;
    };

    _this.drawShape = function (coordinates) {
      _this.clearCanvas();

      _this.props.drawShape(coordinates);
    };

    _this.onMouseOut = function (e) {
      // the mouse out event is handled by default as a click/release on the exiting canvas border
      _this.props.onMouseOut // eslint-disable-line no-unused-expressions
      ? _this.props.onMouseOut(e) : function (e) {};
    };

    _this.eventHandlers = _objectSpread({
      onMouseOut: _this.onMouseOut
    }, (0, _pickBy.default)(props, function (prop, propName) {
      return prop !== null && propName.startsWith('on');
    }));
    return _this;
  }

  (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] !== void 0 ? arguments[0] : this.theme.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] !== void 0 ? arguments[0] : this.theme.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]);
      this.setState({
        isDrawing: true
      });
    }
  }, {
    key: "stopDrawing",
    value: function stopDrawing(coordinates) {
      this.props.handleSetCoordinates(coordinates);
      this.setState({
        isDrawing: false
      });
    } // ===========
    //   HANDLERS
    // ===========

  }, {
    key: "renderCanvas",
    // ===========
    //   RENDER
    // ===========
    value: function renderCanvas() {
      if (this.props.readOnly) {
        return _react.default.createElement("canvas", {
          height: this.props.height,
          ref: this.refCanvas,
          width: this.props.width
        });
      }

      return (
        /* eslint-disable jsx-a11y/no-interactive-element-to-noninteractive-role */
        _react.default.createElement("canvas", Object.assign({
          className: 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 _react.default.createElement("div", {
        className: styles.canvasWrapper
      }, this.renderCanvas());
    }
  }]);
  Canvas.displayName = "Canvas";
  return Canvas;
}(_react.Component), _class2.propTypes = _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
}), _class2.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), _temp)) || _class);
exports.default = Canvas;