carbon-components/es/components/slider/slider.js

Carbon Components is a component library for IBM Cloud

function _typeof(obj) {
  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
    _typeof = function _typeof(obj) {
      return typeof obj;
    };
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    _typeof = function _typeof(obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    };
  }

  return _typeof(obj);
}

function _classCallCheck(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

function _possibleConstructorReturn(self, call) {
  if (call && (_typeof(call) === "object" || typeof call === "function")) {
    return call;
  }

  return _assertThisInitialized(self);
}

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

function _getPrototypeOf(o) {
  _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
    return o.__proto__ || Object.getPrototypeOf(o);
  };
  return _getPrototypeOf(o);
}

function _inherits(subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function");
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      writable: true,
      configurable: true
    }
  });
  if (superClass) _setPrototypeOf(subClass, superClass);
}

function _setPrototypeOf(o, p) {
  _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
    o.__proto__ = p;
    return o;
  };

  return _setPrototypeOf(o, p);
}
/**
 * Copyright IBM Corp. 2016, 2018
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */


import settings from '../../globals/js/settings';
import mixin from '../../globals/js/misc/mixin';
import createComponent from '../../globals/js/mixins/create-component';
import initComponentBySearch from '../../globals/js/mixins/init-component-by-search';
import eventedState from '../../globals/js/mixins/evented-state';
import handles from '../../globals/js/mixins/handles';
import on from '../../globals/js/misc/on';

var Slider =
/*#__PURE__*/
function (_mixin) {
  _inherits(Slider, _mixin);
  /**
   * Slider.
   * @extends CreateComponent
   * @extends InitComponentBySearch
   * @extends Handles
   * @param {HTMLElement} element The element working as an slider.
   */


  function Slider(element, options) {
    var _this;

    _classCallCheck(this, Slider);

    _this = _possibleConstructorReturn(this, _getPrototypeOf(Slider).call(this, element, options));

    _this._changeState = function (state, detail, callback) {
      callback();
    };

    _this.sliderActive = false;
    _this.dragging = false;
    _this.track = _this.element.querySelector(_this.options.selectorTrack);
    _this.filledTrack = _this.element.querySelector(_this.options.selectorFilledTrack);
    _this.thumb = _this.element.querySelector(_this.options.selectorThumb);
    _this.input = _this.element.querySelector(_this.options.selectorInput);

    if (_this.element.dataset.sliderInputBox) {
      _this.boundInput = _this.element.ownerDocument.querySelector(_this.element.dataset.sliderInputBox);

      _this._updateInput();

      _this.manage(on(_this.boundInput, 'change', function (evt) {
        _this.setValue(evt.target.value);
      }));

      _this.manage(on(_this.boundInput, 'focus', function (evt) {
        evt.target.select();
      })); // workaround for safari


      _this.manage(on(_this.boundInput, 'mouseup', function (evt) {
        evt.preventDefault();
      }));
    }

    _this._updatePosition();

    _this.manage(on(_this.thumb, 'mousedown', function () {
      _this.sliderActive = true;
    }));

    _this.manage(on(_this.element.ownerDocument, 'mouseup', function () {
      _this.sliderActive = false;
    }));

    _this.manage(on(_this.element.ownerDocument, 'mousemove', function (evt) {
      var disabled = _this.element.classList.contains(_this.options.classDisabled);

      if (_this.sliderActive === true && !disabled) {
        _this._updatePosition(evt);
      }
    }));

    _this.manage(on(_this.thumb, 'keydown', function (evt) {
      var disabled = _this.element.classList.contains(_this.options.classDisabled);

      if (!disabled) {
        _this._updatePosition(evt);
      }
    }));

    _this.manage(on(_this.track, 'click', function (evt) {
      var disabled = _this.element.classList.contains(_this.options.classDisabled);

      if (!disabled) {
        _this._updatePosition(evt);
      }
    }));

    return _this;
  }

  _createClass(Slider, [{
    key: "_updatePosition",
    value: function _updatePosition(evt) {
      var _this2 = this;

      var _this$_calcValue = this._calcValue(evt),
          left = _this$_calcValue.left,
          newValue = _this$_calcValue.newValue;

      if (this.dragging) {
        return;
      }

      this.dragging = true;
      requestAnimationFrame(function () {
        _this2.dragging = false;
        _this2.thumb.style.left = "".concat(left, "%");
        _this2.filledTrack.style.transform = "translate(0%, -50%) scaleX(".concat(left / 100, ")");
        _this2.input.value = newValue;

        _this2._updateInput();

        _this2.changeState('slider-value-change', {
          value: newValue
        });
      });
    }
  }, {
    key: "_calcValue",
    value: function _calcValue(evt) {
      var _this$getInputProps = this.getInputProps(),
          value = _this$getInputProps.value,
          min = _this$getInputProps.min,
          max = _this$getInputProps.max,
          step = _this$getInputProps.step;

      var range = max - min;
      var valuePercentage = (value - min) / range * 100;
      var left;
      var newValue;
      left = valuePercentage;
      newValue = value;

      if (evt) {
        var type = evt.type;

        if (type === 'keydown') {
          var direction = {
            40: -1,
            // decreasing
            37: -1,
            // decreasing
            38: 1,
            // increasing
            39: 1 // increasing

          }[evt.which];

          if (direction !== undefined) {
            var multiplier = evt.shiftKey === true ? range / step / this.options.stepMultiplier : 1;
            var stepMultiplied = step * multiplier;
            var stepSize = stepMultiplied / range * 100;
            left = valuePercentage + stepSize * direction;
            newValue = Number(value) + stepMultiplied * direction;
          }
        }

        if (type === 'mousemove' || type === 'click') {
          if (type === 'click') {
            this.element.querySelector(this.options.selectorThumb).classList.add(this.options.classThumbClicked);
          } else {
            this.element.querySelector(this.options.selectorThumb).classList.remove(this.options.classThumbClicked);
          }

          var track = this.track.getBoundingClientRect();
          var unrounded = (evt.clientX - track.left) / track.width;
          var rounded = Math.round(range * unrounded / step) * step;
          left = rounded / range * 100;
          newValue = rounded + min;
        }
      }

      if (newValue <= Number(min)) {
        left = 0;
        newValue = min;
      }

      if (newValue >= Number(max)) {
        left = 100;
        newValue = max;
      }

      return {
        left: left,
        newValue: newValue
      };
    }
  }, {
    key: "_updateInput",
    value: function _updateInput() {
      if (this.boundInput) {
        this.boundInput.value = this.input.value;
      }
    }
  }, {
    key: "getInputProps",
    value: function getInputProps() {
      var values = {
        value: Number(this.input.value),
        min: Number(this.input.min),
        max: Number(this.input.max),
        step: this.input.step ? Number(this.input.step) : 1
      };
      return values;
    }
  }, {
    key: "setValue",
    value: function setValue(value) {
      this.input.value = value;

      this._updatePosition();
    }
  }, {
    key: "stepUp",
    value: function stepUp() {
      this.input.stepUp();

      this._updatePosition();
    }
  }, {
    key: "stepDown",
    value: function stepDown() {
      this.input.stepDown();

      this._updatePosition();
    }
    /**
     * The map associating DOM element and Slider UI instance.
     * @type {WeakMap}
     */

  }], [{
    key: "options",

    /**
     * The component options.
     * If `options` is specified in the constructor,
     * properties in this object are overriden for the instance being created.
     * @property {string} selectorInit The CSS selector to find slider instances.
     */
    get: function get() {
      var prefix = settings.prefix;
      return {
        selectorInit: '[data-slider]',
        selectorTrack: ".".concat(prefix, "--slider__track"),
        selectorFilledTrack: ".".concat(prefix, "--slider__filled-track"),
        selectorThumb: ".".concat(prefix, "--slider__thumb"),
        selectorInput: ".".concat(prefix, "--slider__input"),
        classDisabled: "".concat(prefix, "--slider--disabled"),
        classThumbClicked: "".concat(prefix, "--slider__thumb--clicked"),
        eventBeforeSliderValueChange: 'slider-before-value-change',
        eventAfterSliderValueChange: 'slider-after-value-change',
        stepMultiplier: 4
      };
    }
  }]);

  Slider.components = new WeakMap();
  return Slider;
}(mixin(createComponent, initComponentBySearch, eventedState, handles));

export default Slider;