Dual Sliders

Dual Sliders.ipynb

{
 "metadata": {
  "name": "",
  "signature": "sha256:84c7300250d364448fdadb45622e6d0f3de5ce63e3a14f32ff83db494ef9e7ca"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "This notebook demonstrates how to create two sliders and constrain one to have a value less than or equal to the other."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "from IPython.html import widgets"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 2
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Create two sliders by hande and use `on_trait_change` to register callbacks that will be called when either value is changed. These callbacks simple set the `value` of the other slider to the new value."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "s1 = widgets.FloatSliderWidget(min=0.0,max=10.0,step=0.1,value=0.0)\n",
      "s2 = widgets.FloatSliderWidget(min=0.0,max=10.0,step=0.1,value=5.0)\n",
      "\n",
      "def s1_changed(name, new):\n",
      "    if new > s2.value:\n",
      "        s2.value = new\n",
      "\n",
      "def s2_changed(name, new):\n",
      "    if new < s1.value:\n",
      "        s1.value = new\n",
      "        \n",
      "s1.on_trait_change(s1_changed, 'value')\n",
      "s2.on_trait_change(s2_changed, 'value')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 10
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def printer(x, y):\n",
      "    print x, y"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 11
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "These slider instances can simply be passed to `interact`:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "widgets.interact(printer, x=s1, y=s2);"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "3.2 6.1\n"
       ]
      }
     ],
     "prompt_number": 12
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}