zrmc/components/slider.js

ZRMC is an ES7 React wrapper for Material Components Web.

"use strict";

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

var _extends2 = require("babel-runtime/helpers/extends");

var _extends3 = _interopRequireDefault(_extends2);

var _objectWithoutProperties2 = require("babel-runtime/helpers/objectWithoutProperties");

var _objectWithoutProperties3 = _interopRequireDefault(_objectWithoutProperties2);

var _classCallCheck2 = require("babel-runtime/helpers/classCallCheck");

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _createClass2 = require("babel-runtime/helpers/createClass");

var _createClass3 = _interopRequireDefault(_createClass2);

var _possibleConstructorReturn2 = require("babel-runtime/helpers/possibleConstructorReturn");

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _inherits2 = require("babel-runtime/helpers/inherits");

var _inherits3 = _interopRequireDefault(_inherits2);

var _react = require("react");

var _react2 = _interopRequireDefault(_react);

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

var _propTypes2 = _interopRequireDefault(_propTypes);

var _ = require("../");

var _2 = _interopRequireDefault(_);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * mdc-slider
 *
 * See:
 * https://material.io/develop/web/components/input-controls/sliders/
 */

var MDC_SLIDER = "mdc-slider"; /**
                                * Copyright (c) 2015-present, CWB SAS
                                *
                                * This source code is licensed under the MIT license found in the
                                * LICENSE file in the root directory of this source tree.
                                */

var Slider = function (_Component) {
  (0, _inherits3.default)(Slider, _Component);

  function Slider(props) {
    (0, _classCallCheck3.default)(this, Slider);

    var _this = (0, _possibleConstructorReturn3.default)(this, (Slider.__proto__ || Object.getPrototypeOf(Slider)).call(this, props));

    _this.onBlur = function () {
      _this.setState({ focused: false, active: false });
    };

    _this.onFocus = function () {
      if (!_this.props.disabled) {
        _this.setState({ focused: true });
      }
    };

    _this.setRef = function (c) {
      _this.thumbRef = c;
    };

    _this.handleMoveStart = function (event) {
      if (!_this.props.disabled && _this.state.focused) {
        event.preventDefault();
        _this.setState({ active: true });
        var value = _this.moveThumbPosition(event);
        if (_this.props.onChange) {
          _this.props.onChange(value);
        }
      }
    };

    _this.handleMoveChange = function (event) {
      if (!_this.props.disabled && _this.state.active) {
        event.preventDefault();
        var value = _this.moveThumbPosition(event);
        if (_this.props.onChange) {
          _this.props.onChange(value);
        }
      }
    };

    _this.handleMoveEnd = function (event) {
      if (!_this.props.disabled) {
        event.preventDefault();
        _this.setState({ active: false });
        var value = _this.moveThumbPosition(event);
        if (_this.props.onInput) {
          _this.props.onInput(value);
        }
      }
    };

    _this.state = {
      focused: false,
      active: false,
      min: _this.props.min,
      max: _this.props.max,
      value: _this.props.value
    };
    _this.contentWidth = 0;
    return _this;
  }

  (0, _createClass3.default)(Slider, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      this.updateContent();
    }
  }, {
    key: "componentDidUpdate",
    value: function componentDidUpdate() {
      this.updateContent();
    }
  }, {
    key: "setSliderThumbPosition",
    value: function setSliderThumbPosition(min, max, value) {
      var position = 0;
      if (this.contentWidth > 0 && max > 0 && max > min) {
        position = this.contentWidth / (max - min) * value;
      }
      return "transform: translateX(" + position + "px) translateX(-50%);";
    }
  }, {
    key: "moveThumbPosition",
    value: function moveThumbPosition(event) {
      var bounds = this.contentRef.getBoundingClientRect();
      var x = event.clientX - bounds.left;
      var _state = this.state,
          min = _state.min,
          max = _state.max;

      var value = 0;
      if (this.contentWidth > 0 && max > 0 && min < this.state.max) {
        value = (max - min) / this.contentWidth * x + min;
        if (value > max) {
          value = max;
        } else if (value < min) {
          value = min;
        }
        if (this.props.discrete) {
          value = Math.round(value);
        }
      }
      if (value !== this.state.value) {
        this.setState({ value: value });
      }
    }
  }, {
    key: "updateContent",
    value: function updateContent() {
      if (this.contentRef && this.thumbRef) {
        var width = this.contentRef.clientWidth;
        this.contentWidth = width;
        var _state2 = this.state,
            min = _state2.min,
            max = _state2.max,
            value = _state2.value;

        this.thumbRef.style = this.setSliderThumbPosition(min, max, value);
      }
    }
  }, {
    key: "render",
    value: function render() {
      var _this2 = this;

      var _props = this.props,
          discrete = _props.discrete,
          disabled = _props.disabled,
          label = _props.label,
          displayMarker = _props.displayMarker,
          onChange = _props.onChange,
          onInput = _props.onInput,
          props = (0, _objectWithoutProperties3.default)(_props, ["discrete", "disabled", "label", "displayMarker", "onChange", "onInput"]);

      var classes = MDC_SLIDER;
      var container = void 0;
      var _state3 = this.state,
          focused = _state3.focused,
          active = _state3.active,
          min = _state3.min,
          max = _state3.max,
          value = _state3.value;

      if (discrete) {
        classes += " mdc-slider--discrete";
        container = _react2.default.createElement(
          "div",
          { className: "mdc-slider__thumb-container", ref: this.setRef },
          _react2.default.createElement(
            "div",
            { className: "mdc-slider__pin" },
            _react2.default.createElement(
              "span",
              { className: "mdc-slider__pin-value-marker" },
              value
            )
          ),
          _react2.default.createElement(
            "svg",
            { className: "mdc-slider__thumb", width: "21", height: "21" },
            _react2.default.createElement("circle", { cx: "10.5", cy: "10.5", r: "7.875" })
          ),
          _react2.default.createElement("div", { className: "mdc-slider__focus-ring" })
        );
      } else {
        container = _react2.default.createElement(
          "div",
          { className: "mdc-slider__thumb-container", ref: this.setRef },
          _react2.default.createElement(
            "svg",
            { className: "mdc-slider__thumb", width: "21", height: "21" },
            _react2.default.createElement("circle", { cx: "10.5", cy: "10.5", r: "7.875" })
          ),
          _react2.default.createElement("div", { className: "mdc-slider__focus-ring" })
        );
      }
      var p = {
        tabIndex: "0",
        role: "slider",
        "aria-valuemin": min,
        "aria-valuemax": max,
        "aria-valuenow": value,
        "aria-label": label,
        onBlur: this.onBlur,
        onFocus: this.onFocus,
        onMouseDown: this.handleMoveStart,
        onMouseUp: this.handleMoveEnd,
        onMouseMove: this.handleMoveChange,
        onTouchStart: this.handleMoveStart,
        onTouchEnd: this.handleMoveEnd,
        onTouchMove: this.handleMoveChange,
        onTouchCancel: this.handleMoveEnd,

        ref: function ref(c) {
          _this2.contentRef = c;
        }
      };
      if (disabled) {
        classes += " mdc-slider--disabled";
        p["aria-disabled"] = "true";
      } else if (focused) {
        classes += " mdc-slider--focus";
      }
      if (active) {
        classes += " mdc-slider--active";
      }
      var styleTrack = void 0;
      var marker = void 0;
      if (discrete && displayMarker) {
        if (max > 0) {
          var scale = value / max;
          styleTrack = { transform: "scaleX(" + scale + ")" };
        }
        classes += " mdc-slider--display-markers";
        var markers = [];
        for (var i = 0; i < max; i += 1) {
          var key = "marker_" + i;
          markers.push(_react2.default.createElement("div", { className: "mdc-slider__track-marker", key: key }));
        }
        marker = _react2.default.createElement(
          "div",
          { className: "mdc-slider__track-marker-container" },
          markers
        );
      }
      return _2.default.render(_react2.default.createElement(
        "div",
        (0, _extends3.default)({ className: classes }, p),
        _react2.default.createElement(
          "div",
          { className: "mdc-slider__track-container" },
          _react2.default.createElement("div", { className: "mdc-slider__track", style: styleTrack }),
          marker
        ),
        container
      ), props);
    }
  }], [{
    key: "getDerivedStateFromProps",
    value: function getDerivedStateFromProps(nextProps, prevState) {
      var min = nextProps.min,
          max = nextProps.max,
          value = nextProps.value;

      if ((min !== prevState.min || max !== prevState.max || value !== prevState.value) && !nextProps.derivedState) {
        return { min: min, max: max, value: value };
      }
      return null;
    }
  }]);
  return Slider;
}(_react.Component);

exports.default = Slider;


Slider.defaultProps = {
  mdcElement: MDC_SLIDER,
  discrete: false,
  disabled: false,
  min: 0,
  max: 100,
  value: 0,
  label: "",
  displayMarker: false,
  onInput: null,
  onChange: null
};

Slider.propTypes = {
  mdcElement: _propTypes2.default.string,
  discrete: _propTypes2.default.bool,
  disabled: _propTypes2.default.bool,
  min: _propTypes2.default.number,
  max: _propTypes2.default.number,
  value: _propTypes2.default.number,
  label: _propTypes2.default.string,
  displayMarker: _propTypes2.default.bool,
  onInput: _propTypes2.default.func,
  onChange: _propTypes2.default.func
};