examples/Interactive Widgets/Widget Styling.ipynb

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   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "[Index](Index.ipynb) - [Back](Widget Events.ipynb) - [Next](Custom Widget - Hello World.ipynb)"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%html\n",
      "<style>\n",
      ".example-container { background: #999999; padding: 2px; min-height: 100px; }\n",
      ".example-container.sm { min-height: 50px; }\n",
      ".example-box { background: #9999FF; width: 50px; height: 50px; text-align: center; vertical-align: middle; color: white; font-weight: bold; margin: 2px;}\n",
      ".example-box.med { width: 65px; height: 65px; }   \n",
      ".example-box.lrg { width: 80px; height: 80px; }   \n",
      "</style>"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "from IPython.html import widgets\n",
      "from IPython.display import display"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Widget Styling"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Basic styling"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "The widgets distributed with IPython can be styled by setting the following traits:\n",
      "\n",
      "- width  \n",
      "- height  \n",
      "- fore_color  \n",
      "- back_color  \n",
      "- border_color  \n",
      "- border_width  \n",
      "- border_style  \n",
      "- font_style  \n",
      "- font_weight  \n",
      "- font_size  \n",
      "- font_family  \n",
      "\n",
      "The example below shows how a `Button` widget can be styled:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "button = widgets.Button(\n",
      "    description='Hello World!',\n",
      "    width=100, # Integers are interpreted as pixel measurements.\n",
      "    height='2em', # em is valid HTML unit of measurement.\n",
      "    color='lime', # Colors can be set by name,\n",
      "    background_color='#0022FF', # and also by color code.\n",
      "    border_color='red')\n",
      "display(button)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Parent/child relationships"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "To display widget A inside widget B, widget A must be a child of widget B.  Widgets that can contain other widgets have a **`children` attribute**.  This attribute can be **set via a keyword argument** in the widget's constructor **or after construction**.  Calling display on an **object with children automatically displays those children**, too."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "from IPython.display import display\n",
      "\n",
      "float_range = widgets.FloatSlider()\n",
      "string = widgets.Text(value='hi')\n",
      "container = widgets.Box(children=[float_range, string])\n",
      "\n",
      "container.border_color = 'red'\n",
      "container.border_style = 'dotted'\n",
      "container.border_width = 3\n",
      "display(container) # Displays the `container` and all of it's children."
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "After the parent is displayed"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Children **can be added to parents** after the parent has been displayed.  The **parent is responsible for rendering its children**."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "container = widgets.Box()\n",
      "container.border_color = 'red'\n",
      "container.border_style = 'dotted'\n",
      "container.border_width = 3\n",
      "display(container)\n",
      "\n",
      "int_range = widgets.IntSlider()\n",
      "container.children=[int_range]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Fancy boxes"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "If you need to display a more complicated set of widgets, there are **specialized containers** that you can use.  To display **multiple sets of widgets**, you can use an **`Accordion` or a `Tab` in combination with one `Box` per set of widgets** (as seen below).  The \"pages\" of these widgets are their children.  To set the titles of the pages, one must **call `set_title` after the widget has been displayed**."
     ]
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "Accordion"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "name1 = widgets.Text(description='Location:')\n",
      "zip1 = widgets.BoundedIntText(description='Zip:', min=0, max=99999)\n",
      "page1 = widgets.Box(children=[name1, zip1])\n",
      "\n",
      "name2 = widgets.Text(description='Location:')\n",
      "zip2 = widgets.BoundedIntText(description='Zip:', min=0, max=99999)\n",
      "page2 = widgets.Box(children=[name2, zip2])\n",
      "\n",
      "accord = widgets.Accordion(children=[page1, page2])\n",
      "display(accord)\n",
      "\n",
      "accord.set_title(0, 'From')\n",
      "accord.set_title(1, 'To')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "TabWidget"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "name = widgets.Text(description='Name:')\n",
      "color = widgets.Dropdown(description='Color:', values=['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet'])\n",
      "page1 = widgets.Box(children=[name, color])\n",
      "\n",
      "age = widgets.IntSlider(description='Age:', min=0, max=120, value=50)\n",
      "gender = widgets.RadioButtons(description='Gender:', values=['male', 'female'])\n",
      "page2 = widgets.Box(children=[age, gender])\n",
      "\n",
      "tabs = widgets.Tab(children=[page1, page2])\n",
      "display(tabs)\n",
      "\n",
      "tabs.set_title(0, 'Name')\n",
      "tabs.set_title(1, 'Details')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Popup"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Unlike the other two special containers, the `Popup` is only **designed to display one set of widgets**.  The `Popup` can be used to **display widgets outside of the widget area**.  "
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "counter = widgets.IntText(description='Counter:')\n",
      "popup = widgets.Popup(children=[counter], description='Popup Demo', button_text='Popup Button')\n",
      "display(popup)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "counter.value += 1"
     ],
     "language": "python",
     "metadata": {},
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     "cell_type": "code",
     "collapsed": false,
     "input": [
      "counter.value += 1"
     ],
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    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "popup.close()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Alignment"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Most widgets have a **`description` attribute**, which allows a label for the widget to be defined.\n",
      "The label of the widget **has a fixed minimum width**.\n",
      "The text of the label is **always right aligned and the widget is left aligned**:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "display(widgets.Text(description=\"a:\"))\n",
      "display(widgets.Text(description=\"aa:\"))\n",
      "display(widgets.Text(description=\"aaa:\"))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "If a **label is longer** than the minimum width, the **widget is shifted to the right**:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "display(widgets.Text(description=\"a:\"))\n",
      "display(widgets.Text(description=\"aa:\"))\n",
      "display(widgets.Text(description=\"aaa:\"))\n",
      "display(widgets.Text(description=\"aaaaaaaaaaaaaaaaaa:\"))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "If a `description` is **not set** for the widget, the **label is not displayed**:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "display(widgets.Text(description=\"a:\"))\n",
      "display(widgets.Text(description=\"aa:\"))\n",
      "display(widgets.Text(description=\"aaa:\"))\n",
      "display(widgets.Text())"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Flex boxes"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Widgets can be aligned using the `FlexBox`, `HBox`, and `VBox` widgets."
     ]
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Application to widgets"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Widgets display vertically by default:"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "buttons = [widgets.Button(description=str(i)) for i in range(3)]\n",
      "display(*buttons)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Using hbox"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "To make widgets display horizontally, you need to **child them to a `HBox` widget**."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "container = widgets.HBox(children=buttons)\n",
      "display(container)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "By setting the width of the container to 100% and its `pack` to `center`, you can center the buttons."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "container.width = '100%'\n",
      "container.pack = 'center'"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Visibility"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Sometimes it is necessary to **hide or show widgets** in place, **without having to re-display** the widget.\n",
      "The `visibility` property of widgets can be used to hide or show **widgets that have already been displayed** (as seen below)."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string = widgets.Latex(value=\"Hello World!\")\n",
      "display(string) "
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string.visible=False"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "string.visible=True"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {
      "slideshow": {
       "slide_type": "slide"
      }
     },
     "source": [
      "Another example"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "In the example below, a form is rendered, which conditionally displays widgets depending on the state of other widgets.  Try toggling the student checkbox."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "form = widgets.VBox()\n",
      "first = widgets.Text(description=\"First Name:\")\n",
      "last = widgets.Text(description=\"Last Name:\")\n",
      "\n",
      "student = widgets.Checkbox(description=\"Student:\", value=False)\n",
      "school_info = widgets.VBox(visible=False, children=[\n",
      "    widgets.Text(description=\"School:\"),\n",
      "    widgets.IntText(description=\"Grade:\", min=0, max=12)\n",
      "    ])\n",
      "\n",
      "pet = widgets.Text(description=\"Pet's Name:\")\n",
      "form.children = [first, last, student, school_info, pet]\n",
      "display(form)\n",
      "\n",
      "def on_student_toggle(name, value):\n",
      "    if value:\n",
      "        school_info.visible = True\n",
      "    else:\n",
      "        school_info.visible = False\n",
      "student.on_trait_change(on_student_toggle, 'value')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "[Index](Index.ipynb) - [Back](Widget Events.ipynb) - [Next](Custom Widget - Hello World.ipynb)"
     ]
    }
   ],
   "metadata": {}
  }
 ]
}