{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import panel as pn\n",
    "\n",
    "pn.extension()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The ``DiscretePlayer`` widget displays media-player-like controls that allow playing and stepping through the provided options. When playing it triggers events at a pre-defined interval on the frontend, advancing the player value each time. It falls into the broad category of single-value, option-selection widgets that provide a compatible API and include the [``AutocompleteInput``](AutocompleteInput.ipynb), [``Select``](Select.ipynb) and [``DiscreteSlider``](DiscreteSlider.ipynb) widgets.\n",
    "\n",
    "Discover more on using widgets to add interactivity to your applications in the [how-to guides on interactivity](../../how_to/interactivity/index.md). Alternatively, learn [how to set up callbacks and (JS-)links between parameters](../../how_to/links/index.md) or [how to use them as part of declarative UIs with Param](../../how_to/param/index.md).\n",
    "\n",
    "#### Parameters:\n",
    "\n",
    "For details on other options for customizing the component see the [layout](../../how_to/layout/index.md) and [styling](../../how_to/styling/index.md) how-to guides.\n",
    "\n",
    "##### Core\n",
    "\n",
    "* **``direction``** (int): Current play direction of the Player (-1: playing in reverse,\n",
    "0: paused, 1: playing).\n",
    "* **``interval``** (int): Interval in milliseconds between updates\n",
    "* **``loop_policy``** (str): Looping policy; must be one of 'once', 'loop', or 'reflect'\n",
    "* **``options``** (list or dict): A list or dictionary of options to select from\n",
    "* **``value``** (object): The current value; must be one of the option values\n",
    "* **``value_throttled``** (object): The current value throttled until mouseup  (when selected using slider)\n",
    "\n",
    "##### Display\n",
    "\n",
    "* **``disabled``** (boolean): Whether the widget is editable\n",
    "* **``name``** (str): The title of the widget\n",
    "* **``scale_buttons``** (float): The scaling factor to resize the buttons\n",
    "* **``show_loop_controls``** (boolean): Whether radio buttons allowing to switch between loop policies options are shown\n",
    "* **``show_value``** (boolean): Whether to display the value of the player\n",
    "* **``value_align``** (str): Where to display the value; must be one of 'start', 'center', 'end'\n",
    "* **``visible_buttons``** (list[str]): The buttons to display on the player ('slower', 'first', 'previous', 'reverse', 'pause', 'play', 'next', 'last', 'faster')\n",
    "* **``visible_loop_options``** (list[str]): The loop options to display on the player. ('once', 'loop', 'reflect')\n",
    "\n",
    "___"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The widget has a number of buttons to go to the first or last value, step forward or backward, and play and pause the widget. It also provides control over the ``loop_policy``, which determines whether to play 'once', 'loop', or 'reflect'. Additionally ``-`` and ``+`` buttons slow down and speed up the player speed."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "discrete_player = pn.widgets.DiscretePlayer(name='Discrete Player', options=[2, 4, 8, 16, 32, 64, 128],\n",
    "                                            value=8, loop_policy='loop', show_value=True, value_align='start')\n",
    "\n",
    "discrete_player"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Like most other widgets, ``DiscretePlayer`` has a value parameter that can be accessed or set:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "discrete_player.value"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The `DiscretePlayer` can be controlled programmatically using the `direction` parameter which has three possible states:\n",
    "    \n",
    "- `-1`: playing in reverse\n",
    "-  `0`: paused\n",
    "-  `1`: playing\n",
    "\n",
    "Alternatively it can be controlled via the `.play`, `.pause` and `.reverse` methods:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import time\n",
    "\n",
    "discrete_player.play()\n",
    "time.sleep(2)\n",
    "discrete_player.reverse()\n",
    "time.sleep(2)\n",
    "discrete_player.pause()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The `DiscretePlayer` can be slimmed down by setting `scale_buttons`, `show_loop_controls`, `visible_buttons`, and/or `visible_loop_options`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "discrete_player = pn.widgets.DiscretePlayer(name='Player', visible_buttons=[\"play\", \"pause\"], scale_buttons=0.9, show_loop_controls=False, width=150)\n",
    "discrete_player"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Controls\n",
    "\n",
    "The `DiscretePlayer` widget exposes a number of options which can be changed from both Python and Javascript. Try out the effect of these parameters interactively:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pn.Row(discrete_player.controls(jslink=True), discrete_player)"
   ]
  }
 ],
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