bump 5.4.0

* Adjust handle drag position to account for the difference between handle origin and mouse or touch event origin.

* Add slider dragOffset tests.

HISTORY.md

@@ -1,6 +1,11 @@
 # History
 ----
 
+## 5.0.0 / 2016-09-12
+
+[#147](https://github.com/react-component/slider/issues/147) fix style conflicts with rc-tooltip [@benjycui](https://github.com/benjycui)
+[#145](https://github.com/react-component/slider/pull/145) fix `onChange` will be triggered while mousemove [@Fuzzyma](https://github.com/Fuzzyma)
+
 ## 4.0.0 / 2016-08-12
 
 [#133](https://github.com/react-component/slider/pull/133) support multi-range ([@sosz](https://github.com/sosz))

README.md

@@ -56,8 +56,8 @@ require('rc-slider/assets/index.css');
 
 var React = require('react');
 var ReactDOM = require('react-dom');
-var Rcslider = require('rc-slider');
-ReactDOM.render(<Rcslider />, container);
+var Slider = require('rc-slider');
+ReactDOM.render(<Slider />, container);
 ```
 
 ## API
@@ -168,7 +168,7 @@ ReactDOM.render(<Rcslider />, container);
           <td>tipFormatter</td>
           <td>function or `null`</td>
           <td></td>
-          <td>Format the value of the tooltip if it shows. If `null` the tooltip will always be hidden.</td>
+          <td>Format the value of the tooltip if it shows. If `null` the tooltip will always be hidden. When given a function, the first argument will be the value and the second will be the index of the slider handle.</td>
         </tr>
         <tr>
           <td>dots</td>

assets/index.less

@@ -23,13 +23,19 @@
 
 .@{prefixClass} {
   position: relative;
-  height: 4px;
+  height: 14px;
+  padding: 5px 0;
   width: 100%;
   border-radius: @border-radius-base;
-  background-color: #e9e9e9;
-
   .borderBox();
 
+  &-rail {
+    position: absolute;
+    width: 100%;
+    background-color: #e9e9e9;
+    height: 4px;
+  }
+
   &-track {
     position: absolute;
     left: 0;
@@ -62,7 +68,7 @@
 
   &-mark {
     position: absolute;
-    top: 10px;
+    top: 18px;
     left: 0;
     width: 100%;
     font-size: 12px;
@@ -130,23 +136,30 @@
 }
 
 .@{prefixClass}-vertical {
-  width: 4px;
+  width: 14px;
   height: 100%;
+  padding: 0 5px;
+
   .@{prefixClass} {
+    &-rail {
+      height: 100%;
+      width: 4px;
+    }
+
     &-track {
+      left: 5px;
       bottom: 0;
       width: 4px;
     }
 
     &-handle {
-      position: absolute;
       margin-left: -5px;
       margin-bottom: -7px;
     }
 
     &-mark {
       top: 0;
-      left: 10px;
+      left: 18px;
       height: 100%;
     }
 

examples/custom-handles.js

@@ -18,16 +18,19 @@ const handleStyle = {
   textAlign: 'center',
 };
 
-const CustomHandle = props => {
-  const style = Object.assign({ left: `${props.offset}%` }, handleStyle);
-  return (
-    <div style={style}>val: {props.value}</div>
-  );
-};
-CustomHandle.propTypes = {
-  value: React.PropTypes.any,
-  offset: React.PropTypes.number,
-};
+const CustomHandle = React.createClass({
+  propTypes: {
+    value: React.PropTypes.any,
+    offset: React.PropTypes.number,
+  },
+  render() {
+    const props = this.props;
+    const style = Object.assign({ left: `${props.offset}%` }, handleStyle);
+    return (
+        <div style={style}>val: {props.value}</div>
+    );
+  },
+});
 
 ReactDOM.render(
   <div>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rc-slider",
-  "version": "5.1.1",
+  "version": "5.4.0",
   "description": "slider ui component for react",
   "keywords": [
     "react",
@@ -19,10 +19,14 @@
   },
   "files": [
     "assets/*.css",
-    "lib"
+    "lib",
+    "dist"
   ],
   "licenses": "MIT",
   "main": "./lib/index.js",
+  "entry": {
+    "rc-slider": ["./assets/index.less", "./src/index.js"]
+  },
   "style": "./assets/index.css",
   "config": {
     "port": 8005

src/Handle.jsx

@@ -10,18 +10,18 @@ export default class Handle extends React.Component {
     };
   }
 
-  showTooltip() {
-    this.setState({
-      isTooltipVisible: true,
-    });
-  }
-
   hideTooltip() {
     this.setState({
       isTooltipVisible: false,
     });
   }
 
+  showTooltip() {
+    this.setState({
+      isTooltipVisible: true,
+    });
+  }
+
   render() {
     const {
       prefixCls,
@@ -34,6 +34,7 @@ export default class Handle extends React.Component {
       value,
       dragging,
       noTip,
+      index,
     } = this.props;
 
     const style = vertical ? { bottom: `${offset}%` } : { left: `${offset}%` };
@@ -55,7 +56,7 @@ export default class Handle extends React.Component {
         prefixCls={tooltipPrefixCls || `${prefixCls}-tooltip`}
         placement="top"
         visible={isTooltipVisible}
-        overlay={<span>{tipFormatter(value)}</span>}
+        overlay={<span>{tipFormatter(value, index)}</span>}
         delay={0}
         transitionName={tipTransitionName}
       >
@@ -76,4 +77,5 @@ Handle.propTypes = {
   value: React.PropTypes.number,
   dragging: React.PropTypes.bool,
   noTip: React.PropTypes.bool,
+  index: React.PropTypes.number,
 };

src/Marks.jsx

@@ -18,7 +18,7 @@ const Marks = ({ className, vertical, marks, included, upperBound, lowerBound, m
 
     const bottomStyle = {
       // height: markWidth + '%',
-      marginBottom: '-200%',
+      marginBottom: '-50%',
       bottom: `${(point - min) / range * 100}%`,
     };
 

src/Slider.jsx

@@ -1,3 +1,4 @@
+import { findDOMNode } from 'react-dom';
 import React, { cloneElement } from 'react';
 import addEventListener from 'rc-util/lib/Dom/addEventListener';
 import classNames from 'classnames';
@@ -22,6 +23,13 @@ function getMousePosition(vertical, e) {
   return vertical ? e.clientY : e.pageX;
 }
 
+function getHandleCenterPosition(vertical, handle) {
+  const coords = handle.getBoundingClientRect();
+  return vertical ?
+    coords.top + (coords.height * 0.5) :
+    coords.left + (coords.width * 0.5);
+}
+
 function pauseEvent(e) {
   e.stopPropagation();
   e.preventDefault();
@@ -93,7 +101,7 @@ class Slider extends React.Component {
     const isNotControlled = !('value' in props);
     if (isNotControlled) {
       this.setState(state);
-    } else if (state.handle) {
+    } else if (state.handle !== undefined) {
       this.setState({ handle: state.handle });
     }
 
@@ -102,19 +110,25 @@ class Slider extends React.Component {
     props.onChange(changedValue);
   }
 
-  onMouseMove(e) {
-    const position = getMousePosition(this.props.vertical, e);
-    this.onMove(e, position);
+  onMouseDown(e) {
+    if (e.button !== 0) { return; }
+
+    let position = getMousePosition(this.props.vertical, e);
+    if (!this.isEventFromHandle(e)) {
+      this.dragOffset = 0;
+    } else {
+      const handlePosition = getHandleCenterPosition(this.props.vertical, e.target);
+      this.dragOffset = position - handlePosition;
+      position = handlePosition;
+    }
+    this.onStart(position);
+    this.addDocumentEvents('mouse');
+    pauseEvent(e);
   }
 
-  onTouchMove(e) {
-    if (isNotTouchEvent(e)) {
-      this.end('touch');
-      return;
-    }
-
-    const position = getTouchPosition(this.props.vertical, e);
-    this.onMove(e, position);
+  onMouseMove(e) {
+    const position = getMousePosition(this.props.vertical, e);
+    this.onMove(e, position - this.dragOffset);
   }
 
   onMove(e, position) {
@@ -146,23 +160,6 @@ class Slider extends React.Component {
     });
   }
 
-  onTouchStart(e) {
-    if (isNotTouchEvent(e)) return;
-
-    const position = getTouchPosition(this.props.vertical, e);
-    this.onStart(position);
-    this.addDocumentEvents('touch');
-    pauseEvent(e);
-  }
-
-  onMouseDown(e) {
-    if (e.button !== 0) { return; }
-    const position = getMousePosition(this.props.vertical, e);
-    this.onStart(position);
-    this.addDocumentEvents('mouse');
-    pauseEvent(e);
-  }
-
   onStart(position) {
     const props = this.props;
     props.onBeforeChange(this.getValue());
@@ -208,34 +205,30 @@ class Slider extends React.Component {
     this.onChange({ bounds: nextBounds });
   }
 
-  getValue() {
-    const { bounds } = this.state;
-    return this.props.range ? bounds : bounds[1];
-  }
-
-  getSliderLength() {
-    const slider = this.refs.slider;
-    if (!slider) {
-      return 0;
+  onTouchMove(e) {
+    if (isNotTouchEvent(e)) {
+      this.end('touch');
+      return;
     }
 
-    return this.props.vertical ? slider.clientHeight : slider.clientWidth;
+    const position = getTouchPosition(this.props.vertical, e);
+    this.onMove(e, position - this.dragOffset);
   }
 
-  getSliderStart() {
-    const slider = this.refs.slider;
-    const rect = slider.getBoundingClientRect();
+  onTouchStart(e) {
+    if (isNotTouchEvent(e)) return;
 
-    return this.props.vertical ? rect.top : rect.left;
-  }
-
-  getPrecision(step) {
-    const stepString = step.toString();
-    let precision = 0;
-    if (stepString.indexOf('.') >= 0) {
-      precision = stepString.length - stepString.indexOf('.') - 1;
+    let position = getTouchPosition(this.props.vertical, e);
+    if (!this.isEventFromHandle(e)) {
+      this.dragOffset = 0;
+    } else {
+      const handlePosition = getHandleCenterPosition(this.props.vertical, e.target);
+      this.dragOffset = position - handlePosition;
+      position = handlePosition;
     }
-    return precision;
+    this.onStart(position);
+    this.addDocumentEvents('touch');
+    pauseEvent(e);
   }
 
   /**
@@ -259,10 +252,155 @@ class Slider extends React.Component {
     return this._getPointsCache.points;
   }
 
+  getPrecision(step) {
+    const stepString = step.toString();
+    let precision = 0;
+    if (stepString.indexOf('.') >= 0) {
+      precision = stepString.length - stepString.indexOf('.') - 1;
+    }
+    return precision;
+  }
+
+  getSliderLength() {
+    const slider = this.refs.slider;
+    if (!slider) {
+      return 0;
+    }
+
+    return this.props.vertical ? slider.clientHeight : slider.clientWidth;
+  }
+
+  getSliderStart() {
+    const slider = this.refs.slider;
+    const rect = slider.getBoundingClientRect();
+
+    return this.props.vertical ? rect.top : rect.left;
+  }
+
+  getValue() {
+    const { bounds } = this.state;
+    return this.props.range ? bounds : bounds[1];
+  }
+
+  addDocumentEvents(type) {
+    if (type === 'touch') {
+      // just work for chrome iOS Safari and Android Browser
+      this.onTouchMoveListener =
+        addEventListener(document, 'touchmove', this.onTouchMove.bind(this));
+      this.onTouchUpListener =
+        addEventListener(document, 'touchend', this.end.bind(this, 'touch'));
+    } else if (type === 'mouse') {
+      this.onMouseMoveListener =
+        addEventListener(document, 'mousemove', this.onMouseMove.bind(this));
+      this.onMouseUpListener =
+        addEventListener(document, 'mouseup', this.end.bind(this, 'mouse'));
+    }
+  }
+
+  calcOffset(value) {
+    const { min, max } = this.props;
+    const ratio = (value - min) / (max - min);
+    return ratio * 100;
+  }
+
+  calcValue(offset) {
+    const { vertical, min, max } = this.props;
+    const ratio = Math.abs(offset / this.getSliderLength());
+    const value = vertical ? (1 - ratio) * (max - min) + min : ratio * (max - min) + min;
+    return value;
+  }
+
+  calcValueByPos(position) {
+    const pixelOffset = position - this.getSliderStart();
+    const nextValue = this.trimAlignValue(this.calcValue(pixelOffset));
+    return nextValue;
+  }
+
+  end(type) {
+    this.removeEvents(type);
+    this.props.onAfterChange(this.getValue());
+    this.setState({ handle: null });
+  }
+
+  isEventFromHandle(e) {
+    return this.state.bounds.some((x, i) => (
+        this.refs[`handle-${i}`] &&
+        e.target === findDOMNode(this.refs[`handle-${i}`])
+    ));
+  }
+
   isValueOutOfBounds(value, props) {
     return value < props.min || value > props.max;
   }
 
+  pushHandle(bounds, handle, direction, amount) {
+    const originalValue = bounds[handle];
+    let currentValue = bounds[handle];
+    while (direction * (currentValue - originalValue) < amount) {
+      if (!this.pushHandleOnePoint(bounds, handle, direction)) {
+        // can't push handle enough to create the needed `amount` gap, so we
+        // revert its position to the original value
+        bounds[handle] = originalValue;
+        return false;
+      }
+      currentValue = bounds[handle];
+    }
+    // the handle was pushed enough to create the needed `amount` gap
+    return true;
+  }
+
+  pushHandleOnePoint(bounds, handle, direction) {
+    const points = this.getPoints();
+    const pointIndex = points.indexOf(bounds[handle]);
+    const nextPointIndex = pointIndex + direction;
+    if (nextPointIndex >= points.length || nextPointIndex < 0) {
+      // reached the minimum or maximum available point, can't push anymore
+      return false;
+    }
+    const nextHandle = handle + direction;
+    const nextValue = points[nextPointIndex];
+    const { pushable: threshold } = this.props;
+    const diffToNext = direction * (bounds[nextHandle] - nextValue);
+    if (!this.pushHandle(bounds, nextHandle, direction, threshold - diffToNext)) {
+      // couldn't push next handle, so we won't push this one either
+      return false;
+    }
+    // push the handle
+    bounds[handle] = nextValue;
+    return true;
+  }
+
+  pushSurroundingHandles(bounds, handle, originalValue) {
+    const { pushable: threshold } = this.props;
+    const value = bounds[handle];
+
+    let direction = 0;
+    if (bounds[handle + 1] - value < threshold) {
+      direction = +1;
+    } else if (value - bounds[handle - 1] < threshold) {
+      direction = -1;
+    }
+
+    if (direction === 0) { return; }
+
+    const nextHandle = handle + direction;
+    const diffToNext = direction * (bounds[nextHandle] - value);
+    if (!this.pushHandle(bounds, nextHandle, direction, threshold - diffToNext)) {
+      // revert to original value if pushing is impossible
+      bounds[handle] = originalValue;
+    }
+  }
+
+  removeEvents(type) {
+    if (type === 'touch') {
+      this.onTouchMoveListener.remove();
+      this.onTouchUpListener.remove();
+    } else if (type === 'mouse') {
+      this.onMouseMoveListener.remove();
+      this.onMouseUpListener.remove();
+    }
+  }
+
   trimAlignValue(v, nextProps) {
     const state = this.state || {};
     const { handle, bounds } = state;
@@ -296,114 +434,6 @@ class Slider extends React.Component {
     return step !== null ? parseFloat(closestPoint.toFixed(this.getPrecision(step))) : closestPoint;
   }
 
-  pushHandleOnePoint(bounds, handle, direction) {
-    const points = this.getPoints();
-    const pointIndex = points.indexOf(bounds[handle]);
-    const nextPointIndex = pointIndex + direction;
-    if (nextPointIndex >= points.length || nextPointIndex < 0) {
-      // reached the minimum or maximum available point, can't push anymore
-      return false;
-    }
-    const nextHandle = handle + direction;
-    const nextValue = points[nextPointIndex];
-    const { pushable: threshold } = this.props;
-    const diffToNext = direction * (bounds[nextHandle] - nextValue);
-    if (!this.pushHandle(bounds, nextHandle, direction, threshold - diffToNext)) {
-      // couldn't push next handle, so we won't push this one either
-      return false;
-    }
-    // push the handle
-    bounds[handle] = nextValue;
-    return true;
-  }
-
-  pushHandle(bounds, handle, direction, amount) {
-    const originalValue = bounds[handle];
-    let currentValue = bounds[handle];
-    while (direction * (currentValue - originalValue) < amount) {
-      if (!this.pushHandleOnePoint(bounds, handle, direction)) {
-        // can't push handle enough to create the needed `amount` gap, so we
-        // revert its position to the original value
-        bounds[handle] = originalValue;
-        return false;
-      }
-      currentValue = bounds[handle];
-    }
-    // the handle was pushed enough to create the needed `amount` gap
-    return true;
-  }
-
-  pushSurroundingHandles(bounds, handle, originalValue) {
-    const { pushable: threshold } = this.props;
-    const value = bounds[handle];
-
-    let direction = 0;
-    if (bounds[handle + 1] - value < threshold) {
-      direction = +1;
-    } else if (value - bounds[handle - 1] < threshold) {
-      direction = -1;
-    }
-
-    if (direction === 0) { return; }
-
-    const nextHandle = handle + direction;
-    const diffToNext = direction * (bounds[nextHandle] - value);
-    if (!this.pushHandle(bounds, nextHandle, direction, threshold - diffToNext)) {
-      // revert to original value if pushing is impossible
-      bounds[handle] = originalValue;
-    }
-  }
-
-  calcOffset(value) {
-    const { min, max } = this.props;
-    const ratio = (value - min) / (max - min);
-    return ratio * 100;
-  }
-
-  calcValue(offset) {
-    const { vertical, min, max } = this.props;
-    const ratio = Math.abs(offset / this.getSliderLength());
-    const value = vertical ? (1 - ratio) * (max - min) + min : ratio * (max - min) + min;
-    return value;
-  }
-
-  calcValueByPos(position) {
-    const pixelOffset = position - this.getSliderStart();
-    const nextValue = this.trimAlignValue(this.calcValue(pixelOffset));
-    return nextValue;
-  }
-
-  addDocumentEvents(type) {
-    if (type === 'touch') {
-      // just work for chrome iOS Safari and Android Browser
-      this.onTouchMoveListener =
-        addEventListener(document, 'touchmove', this.onTouchMove.bind(this));
-      this.onTouchUpListener =
-        addEventListener(document, 'touchend', this.end.bind(this, 'touch'));
-    } else if (type === 'mouse') {
-      this.onMouseMoveListener =
-        addEventListener(document, 'mousemove', this.onMouseMove.bind(this));
-      this.onMouseUpListener =
-        addEventListener(document, 'mouseup', this.end.bind(this, 'mouse'));
-    }
-  }
-
-  removeEvents(type) {
-    if (type === 'touch') {
-      this.onTouchMoveListener.remove();
-      this.onTouchUpListener.remove();
-    } else if (type === 'mouse') {
-      this.onMouseMoveListener.remove();
-      this.onMouseUpListener.remove();
-    }
-  }
-
-  end(type) {
-    this.removeEvents(type);
-    this.props.onAfterChange(this.getValue());
-    this.setState({ handle: null });
-  }
-
   render() {
     const {
         handle,
@@ -456,7 +486,9 @@ class Slider extends React.Component {
       value: v,
       offset: offsets[i],
       dragging: handle === i,
+      index: i,
       key: i,
+      ref: `handle-${i}`,
     }));
     if (!range) { handles.shift(); }
 
@@ -477,9 +509,10 @@ class Slider extends React.Component {
 
     const sliderClassName = classNames({
       [prefixCls]: true,
+      [`${prefixCls}-with-marks`]: Object.keys(marks).length,
       [`${prefixCls}-disabled`]: disabled,
-      [className]: !!className,
       [`${prefixCls}-vertical`]: this.props.vertical,
+      [className]: !!className,
     });
 
     return (
@@ -487,6 +520,7 @@ class Slider extends React.Component {
         onTouchStart={disabled ? noop : this.onTouchStart.bind(this)}
         onMouseDown={disabled ? noop : this.onMouseDown.bind(this)}
       >
+        <div className={`${prefixCls}-rail`} />
         {tracks}
         <Steps prefixCls={prefixCls} vertical = {vertical} marks={marks} dots={dots} step={step}
           included={isIncluded} lowerBound={bounds[0]}

tests/index.js

@@ -5,6 +5,18 @@ const ReactDOM = require('react-dom');
 const ReactTestUtils = require('react-addons-test-utils');
 const Slider = require('..');
 
+function createSliderWrapperComponent() {
+  return class SliderWrapper extends React.Component {
+    render() {
+      return (
+        <div style={{ position: `absolute`, width: `100px`, height: `10px` }}>
+          <Slider ref="slider"/>
+        </div>
+      );
+    }
+  };
+}
+
 require('../assets/index.less');
 
 describe('rc-slider', function test() {
@@ -232,4 +244,100 @@ describe('rc-slider', function test() {
 
     expect(values.length).to.be(0);
   });
+
+  it('should set `dragOffset` to correct value when the left handle is clicked off-center', () => {
+    const slider = ReactDOM.render(<Slider />, div);
+    const leftHandle = ReactTestUtils.scryRenderedDOMComponentsWithClass(slider, 'rc-slider-handle')[0];
+    slider.onMouseDown({
+      type: 'mousedown',
+      target: leftHandle,
+      pageX: 5, button: 0,
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.dragOffset).to.be(5);
+  });
+
+  it('should respect `dragOffset` while dragging the handle via MouseEvents', () => {
+    const SliderWrapper = createSliderWrapperComponent();
+    const slider = ReactDOM.render(<SliderWrapper/>, div).refs.slider;
+    const leftHandle = ReactTestUtils.scryRenderedDOMComponentsWithClass(slider, 'rc-slider-handle')[0];
+    slider.onMouseDown({
+      type: 'mousedown',
+      target: leftHandle,
+      pageX: 5, button: 0,
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.dragOffset).to.be(5);
+    slider.onMouseMove({
+      type: 'mousemove',
+      target: leftHandle,
+      pageX: 14, button: 0,
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.getValue()).to.be(9);
+  });
+
+  it('should set `dragOffset` to 0 when the MouseEvent target isn\'t a handle', () => {
+    const slider = ReactDOM.render(<Slider />, div);
+    const sliderTrack = ReactTestUtils.scryRenderedDOMComponentsWithClass(slider, 'rc-slider-track')[0];
+    slider.onMouseDown({
+      type: 'mousedown',
+      target: sliderTrack,
+      pageX: 5, button: 0,
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.dragOffset).to.be(0);
+  });
+
+  it('should set `dragOffset` to correct value when the left handle is touched off-center', () => {
+    const slider = ReactDOM.render(<Slider />, div);
+    const leftHandle = ReactTestUtils.scryRenderedDOMComponentsWithClass(slider, 'rc-slider-handle')[0];
+    slider.onTouchStart({
+      type: 'touchstart',
+      target: leftHandle,
+      touches: [{ pageX: 5 }],
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.dragOffset).to.be(5);
+  });
+
+  it('should respect `dragOffset` while dragging the handle via TouchEvents', () => {
+    const SliderWrapper = createSliderWrapperComponent();
+    const slider = ReactDOM.render(<SliderWrapper/>, div).refs.slider;
+    const leftHandle = ReactTestUtils.scryRenderedDOMComponentsWithClass(slider, 'rc-slider-handle')[0];
+    slider.onTouchStart({
+      type: 'touchstart',
+      target: leftHandle,
+      touches: [{ pageX: 5 }],
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.dragOffset).to.be(5);
+    slider.onTouchMove({
+      type: 'touchmove',
+      target: leftHandle,
+      touches: [{ pageX: 14 }],
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.getValue()).to.be(9);
+  });
+
+  it('should set `dragOffset` to 0 when the TouchEvent target isn\'t a handle', () => {
+    const slider = ReactDOM.render(<Slider />, div);
+    const sliderTrack = ReactTestUtils.scryRenderedDOMComponentsWithClass(slider, 'rc-slider-track')[0];
+    slider.onTouchStart({
+      type: 'touchstart',
+      target: sliderTrack,
+      touches: [{ pageX: 5 }],
+      stopPropagation() {},
+      preventDefault() {},
+    });
+    expect(slider.dragOffset).to.be(0);
+  });
 });