diff --git a/src/common/util.js b/src/common/util.js
index 2126f3d45..9ab1294bc 100644
--- a/src/common/util.js
+++ b/src/common/util.js
@@ -245,6 +245,12 @@ module.exports = {
 
     context[method] = (...args) =>
       refinement.call(context, args, original.apply(context, args))
+  },
+
+  restrict(value, lower, upper) {
+    value = Math.max(value, (lower != null) ? lower : value)
+    value = Math.min(value, (upper != null) ? upper : value)
+    return value
   }
 
 }
diff --git a/src/components/panel.js b/src/components/panel.js
index 5259f4512..e04b406c1 100644
--- a/src/components/panel.js
+++ b/src/components/panel.js
@@ -57,7 +57,7 @@ const PanelGroup = ({ header, children, height }) => {
       </header>
       <div className="panel-group-body">
         {panels.map((panel, idx) => (
-          <Resizable key={idx} relative edge="bottom" value={height[idx]}>
+          <Resizable key={idx} isRelative edge="bottom" value={height[idx]}>
             {panel}
           </Resizable>
         ))}
diff --git a/src/components/resizable.js b/src/components/resizable.js
index 00e0e6ca4..a2569859e 100644
--- a/src/components/resizable.js
+++ b/src/components/resizable.js
@@ -1,9 +1,13 @@
 'use strict'
 
 const React = require('react')
-const { PropTypes } = React
-const { Shapes } = require('./util')
-const cn = require('classnames')
+const { PureComponent, PropTypes } = React
+const { func, node, bool, number, oneOf } = PropTypes
+const cx = require('classnames')
+const { bounds, on, off } = require('../dom')
+const { restrict } = require('../common/util')
+const { keys } = Object
+
 
 const DIR = {
   top: 'row', right: 'col', bottom: 'row', left: 'col'
@@ -13,36 +17,132 @@ const DIM = {
   top: 'height', right: 'width', bottom: 'height', left: 'width'
 }
 
+const OPP = {
+  top: 'bottom', right: 'left', bottom: 'top', left: 'right'
+}
 
-const ResizableHandle = ({ edge }) => (
-  <div className={cn([
-    `resizable-handle-${DIR[edge]}`,
-    `resizable-handle-${edge}`
-  ])}/>
-)
-
-ResizableHandle.propTypes = {
-  edge: Shapes.edge.isRequired
+const AXS = {
+  top: 'pageY', right: 'pageX', bottom: 'pageY', left: 'pageX'
 }
 
 
-const Resizable = ({ value, children, edge, relative }) => (
-  <div
-    className="resizable"
-    style={{ [DIM[edge]]: `${value}${relative ? '%' : 'px'}` }}>
-    {children}
-    <ResizableHandle edge={edge}/>
-  </div>
-)
-
-Resizable.propTypes = {
-  children: PropTypes.node,
-  edge: Shapes.edge.isRequired,
-  relative: PropTypes.bool,
-  value: PropTypes.number.isRequired
+class Resizable extends PureComponent {
+  constructor(props) {
+    super(props)
+
+    this.state = {
+      value: props.value,
+      isDragging: false
+    }
+  }
+
+  componentWillUnmount() {
+    if (this.state.isDragging) {
+      this.stop()
+    }
+  }
+
+  componentWillReceiveProps(props) {
+    this.setState({ value: props.value })
+  }
+
+  get dimension() {
+    return DIM[this.props.edge]
+  }
+
+  get value() {
+    return `${this.state.value}${this.props.isRelative ? '%' : 'px'}`
+  }
+
+  get style() {
+    return {
+      [this.dimension]: this.value
+    }
+  }
+
+  handleMouseDown = () => {
+    this.start()
+  }
+
+  setContainer = (container) => {
+    this.container = container
+  }
+
+  update = (event) => {
+    const { edge, min, max } = this.props
+
+    const origin = bounds(this.container)[OPP[edge]]
+    const value = restrict(event[AXS[edge]] - origin, min, max)
+
+    this.setState({ value })
+  }
+
+  start() {
+    this.setState({ isDragging: true })
+
+    on(document, 'mousemove', this.update)
+    on(document, 'mouseup', this.stop, { capture: true })
+    on(document, 'mouseleave', this.stop)
+    on(window, 'blur', this.stop)
+  }
+
+  stop = () => {
+    this.setState({ isDragging: false })
+
+    off(document, 'mousemove', this.update)
+    off(document, 'mouseup', this.stop, { capture: true })
+    off(document, 'mouseleave', this.stop)
+    off(window, 'blur', this.stop)
+
+    if (this.props.value !== this.state.value) {
+      //this.props.onResize(value)
+      //console.log('resize', this.state.value)
+    }
+  }
+
+
+  renderHandle() {
+    const { edge, isDisabled } = this.props
+
+    return !isDisabled && (
+      <div
+        onMouseDown={this.handleMouseDown}
+        className={cx([
+          `resizable-handle-${DIR[edge]}`,
+          `resizable-handle-${edge}`
+        ])}/>
+    )
+  }
+
+  render() {
+    return (
+      <div
+        ref={this.setContainer}
+        className="resizable"
+        style={this.style}>
+        {this.props.children}
+        {this.renderHandle()}
+      </div>
+    )
+  }
+
+  static propTypes = {
+    children: node,
+    edge: oneOf(keys(DIM)).isRequired,
+    isDisabled: bool,
+    isRelative: bool,
+    value: number.isRequired,
+    min: number,
+    max: number,
+    onResize: func //.isRequired
+  }
+
+  static defaultProps = {
+    min: 0
+  }
 }
 
+
 module.exports = {
-  Resizable,
-  ResizableHandle
+  Resizable
 }
diff --git a/src/components/slider.js b/src/components/slider.js
index b02d11f3d..566dc1fe6 100644
--- a/src/components/slider.js
+++ b/src/components/slider.js
@@ -5,8 +5,9 @@ const { PureComponent, PropTypes } = React
 const { IconButton } = require('./button')
 const cx = require('classnames')
 const { bounds, borders, on, off } = require('../dom')
-const { noop } = require('../common/util')
+const { restrict } = require('../common/util')
 const { bool, element, func, number, oneOf } = PropTypes
+const { round } = Math
 
 
 class Slider extends PureComponent {
@@ -20,7 +21,7 @@ class Slider extends PureComponent {
 
   componentWillReceiveProps({ value }) {
     if (value !== this.props.value &&
-        value !== Math.round(this.state.value)) {
+        value !== round(this.state.value)) {
       this.setState({ value })
     }
   }
@@ -44,7 +45,7 @@ class Slider extends PureComponent {
     const left = box.left + border.left
     const width = box.width - border.left - border.right
 
-    this.set(min + restrict((event.pageX - left) / width) * max)
+    this.set(min + restrict((event.pageX - left) / width, 0, 1) * max)
   }
 
   handleMouseDown = ({ button, pageX }) => {
@@ -54,21 +55,10 @@ class Slider extends PureComponent {
     this.startDragging()
   }
 
-  handleMouseUp = (event) => {
-    try {
-      if (event instanceof MouseEvent) {
-        this.update(event)
-      }
-
-    } finally {
-      this.stopDragging()
-    }
-  }
-
   set = (value) => {
     this.setState({ value })
 
-    const nearest = Math.round(value)
+    const nearest = round(value)
 
     if (nearest !== this.props.value) {
       this.props.onChange(nearest)
@@ -106,18 +96,18 @@ class Slider extends PureComponent {
     this.setState({ isDragging: true })
 
     on(document, 'mousemove', this.update)
-    on(document, 'mouseup', this.handleMouseUp, { capture: true })
+    on(document, 'mouseup', this.stopDragging, { capture: true })
     on(document, 'mouseleave', this.stopDragging)
-    on(window, 'blur', this.handleMouseUp)
+    on(window, 'blur', this.stopDragging)
   }
 
   stopDragging = () => {
     this.setState({ isDragging: false })
 
     off(document, 'mousemove', this.update)
-    off(document, 'mouseup', this.handleMouseUp, { capture: true })
+    off(document, 'mouseup', this.stopDragging, { capture: true })
     off(document, 'mouseleave', this.stopDragging)
-    off(window, 'blur', this.handleMouseUp)
+    off(window, 'blur', this.stopDragging)
 
     if (this.delayed) {
       clearTimeout(this.delayed)
@@ -197,15 +187,10 @@ class Slider extends PureComponent {
   static defaultProps = {
     min: 0,
     max: 1,
-    size: 'md',
-    onChange: noop
+    size: 'md'
   }
 }
 
-function restrict(value, lower = 0, upper = 1) {
-  return Math.min(Math.max(value, lower), upper)
-}
-
 module.exports = {
   Slider
 }
diff --git a/src/components/util.js b/src/components/util.js
index 378344a3f..3c4c9af6f 100644
--- a/src/components/util.js
+++ b/src/components/util.js
@@ -1,7 +1,7 @@
 'use strict'
 
 const {
-  Children, PropTypes, PureComponent, createElement: create
+  Children, PureComponent, createElement: create
 } = require('react')
 
 const { diff } = require('../common/util')
@@ -86,8 +86,6 @@ module.exports = {
   },
 
   Shapes: {
-    edge: PropTypes.oneOf(['top', 'right', 'bottom', 'left']),
-
     number(min, max, required = true) {
       return (props, name, component) => {
         const value = props[name]