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       "VBox(children=(FileUpload(value={}, description='Upload', multiple=True), HTML(value=\"Use the above 'Upload' b…"
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   "source": [
    "import numpy as np\n",
    "from traitlets import dlink\n",
    "import ipywidgets as widgets\n",
    "from IPython.display import display\n",
    "from io import StringIO\n",
    "import glob\n",
    "import random \n",
    "\n",
    "# widgets\n",
    "file_uploader = widgets.FileUpload(multiple=True )\n",
    "#file_name = widgets.Text()\n",
    "#files = glob.glob(\"*.xlsx\")\n",
    "#files = glob.glob(\"*.csv\")\n",
    "files = glob.glob(\"*.tsv\")\n",
    "#print(files)  # FOR DEBUGGING ONLY\n",
    "current_file = None\n",
    "\n",
    "#upload_suggest = widgets.Label(value=\"Use above button to upload your data file if not listed among the choices below.)\")\n",
    "#select_markdown = widgets.HTML(value=markdown.markdown(\"\"\"Use above button to upload your data file if not among the choices you see listed below.<br/>**Choose the file with the data to plot from below**:\"\"\")) # based on https://github.com/jupyter-widgets/ipywidgets/issues/2428#issuecomment-500084610 and https://ipywidgets.readthedocs.io/en/stable/examples/Widget%20List.html#HTML ; need to pip install markdown first and import it\n",
    "select_markdown = widgets.HTML(value=\"Use the above 'Upload' button to \"\n",
    "                               \"upload your data file if it is not among the choices you see \"\n",
    "                               \"listed below.<br/><b>Click on the file name among list below \"\n",
    "                               \"to select the data to plot</b> and then click the \"\n",
    "                               \"'Plot Selected' button.\")\n",
    "\n",
    "select_file = widgets.Select(options = files, description='Data files:')\n",
    "button = widgets.Button(description=\"Plot Selected\")\n",
    "ax = None\n",
    "out = widgets.Output()\n",
    "\n",
    "@out.capture(clear_output=True,wait=True)\n",
    "def on_button_clicked(b):\n",
    "    global file_uploader,select_file, current_file, ax\n",
    "    # get data file to be used\n",
    "    current_file = select_file.value\n",
    "    print(f\"Using data from:\\t{current_file}\")\n",
    "    # bring data into Pandas\n",
    "    import pandas as pd\n",
    "    import matplotlib.pyplot as plt\n",
    "    import numpy as np\n",
    "    import seaborn as sns\n",
    "    from mpl_toolkits.mplot3d import Axes3D\n",
    "    from ipywidgets import interact\n",
    "    from ipywidgets.widgets import FloatSlider, IntSlider, Dropdown\n",
    "    #wines = pd.read_excel(current_file) # Uncomment for Excel files\n",
    "    #wines = pd.read_csv(current_file) # Uncomment for CSV files\n",
    "    wines = pd.read_csv(current_file, sep='\\t')\n",
    "    #print(wines.head(random.randint(2, 12) ))\n",
    "    #construct or update plot\n",
    "    \n",
    "    if ax is None:\n",
    "        '''\n",
    "        fig1, axes1 = plt.subplots()\n",
    "        df.hist(ax = axes1)\n",
    "        '''\n",
    "        # BOTH `plt.show(fig1)` and `plt.show(block=True)` seem to work\n",
    "        #plt.show(fig1) # based on https://stackoverflow.com/a/51060721/8508004\n",
    "        #plt.show(block=True) # based on https://stackoverflow.com/a/61993497/8508004\n",
    "        xs = wines['residual sugar']\n",
    "        ys = wines['fixed acidity']\n",
    "        zs = wines['alcohol']\n",
    "        cmaps = ['coolwarm', 'viridis', 'magma','plasma','RdYlBu','YlGnBu','hsv']\n",
    "        v_angles = [\"30, 185\",\"50, 185\",\"230,110\",\"1,140\"]\n",
    "\n",
    "        view_widget = Dropdown(options=v_angles)\n",
    "        elevation_widget= IntSlider(value=30, min=0, max=360,step=5, continuous_update=False)\n",
    "        azimuth_widget= IntSlider(value=185, min=0, max=360,step=5, continuous_update=False)\n",
    "        def update_elevation_and_azimuth(*args):\n",
    "            view_nums = view_widget.value.split(\",\")\n",
    "            view_nums = [int(x) for x in view_nums]\n",
    "            elevation_widget.value, azimuth_widget.value = view_nums\n",
    "        view_widget.observe(update_elevation_and_azimuth, 'value')\n",
    "\n",
    "        def plot_data(opacity, cmap, coloring,marker_size,view_choice,elevation,azimuth):\n",
    "            fig = plt.figure(figsize=(9.5, 6))\n",
    "            ax = fig.add_subplot(111, projection='3d')\n",
    "            #norm = mpl.colors.Normalize(vmin=min(wines[coloring],), vmax=max(wines[coloring],))\n",
    "            g = ax.scatter(xs, ys, zs, s=marker_size, alpha=opacity, edgecolors='w', marker='o', depthshade=False, c=wines[coloring], cmap=cmap)\n",
    "            ax.view_init(elevation,azimuth)\n",
    "            ax.set_xlabel('Residual Sugar')\n",
    "            ax.set_ylabel('Fixed Acidity')\n",
    "            ax.set_zlabel('Alcohol')\n",
    "            clb = fig.colorbar(g)\n",
    "            clb.solids.set_edgecolor(\"face\") #based on https://stackoverflow.com/a/5495912/8508004; \n",
    "            # addition of `.solids.set_edgecolor(\"face\")` based on https://matplotlib.org/3.1.0/api/_as_gen/matplotlib.pyplot.colorbar.html to \n",
    "            # avoid banding seen with just `fig.colorbar(g)` along with ipywidgets use; note it needed further adjusting to \n",
    "            # clb.solids.set_edgecolor(\"face\") when added title to colorbar based on https://stackoverflow.com/a/33740567/8508004\n",
    "            clb.ax.set_title(coloring) #adding title based on https://stackoverflow.com/a/33740567/8508004\n",
    "            plt.show()\n",
    "\n",
    "        p = interact(plot_data,\n",
    "                     opacity=FloatSlider(value=0.75, min=0, max=1.0, step=0.05, readout_format='.3f', continuous_update=False),\n",
    "                     cmap=Dropdown(value='magma',options=cmaps),\n",
    "                     coloring=Dropdown(value='alcohol',options=['residual sugar','fixed acidity','alcohol']),\n",
    "                     marker_size= IntSlider(value=50, min=10, max=180,step=10, continuous_update=False),\n",
    "                     view_choice=view_widget,\n",
    "                     elevation= elevation_widget,\n",
    "                     azimuth= azimuth_widget\n",
    "                    )\n",
    "    else:\n",
    "        print(\"updating...\")\n",
    "        #ax = fig.add_subplot(111, projection='3d')\n",
    "    #display(fig1)\n",
    "    vbox.children = [file_uploader, select_markdown, select_file,button, out]\n",
    "    \n",
    "\n",
    "button.on_click(on_button_clicked)\n",
    "vbox = widgets.VBox([file_uploader, select_markdown, select_file,button])\n",
    "\n",
    "def on_file_upload(change):\n",
    "    global file_uploader,select_file, current_file\n",
    "    print(change['new'])\n",
    "    #for filename in change['new'].keys(): #worked last time I tried, now `change['new']` is a tuple for each file with a dictionary as each item\n",
    "    for details_dict in change['new']:\n",
    "\n",
    "        #files.append(filename) #worked with `for filename in change['new'].keys():`\n",
    "        files.append(details_dict['name'])\n",
    "\n",
    "        #with open(details_dict['name'], \"wb\") as f: #worked with `for filename in change['new'].keys():`\n",
    "        with open(details_dict['name'], \"wb\") as f:\n",
    "            #f.write(change['new'][filename]['content']) #worked with `for filename in change['new'].keys():`\n",
    "            f.write(details_dict['content'])\n",
    "    #select_file.options=tuple(files)\n",
    "\n",
    "    current_file = select_file.value\n",
    "    select_file.options=tuple(files)\n",
    "    select_file.value\n",
    "    #print(current_file)\n",
    "\n",
    "# links between widgets\n",
    "#color_picker.observe(change_input, 'value')\n",
    "#dlink((file_uploader, 'value'), (select_file, 'value'), get_name)\n",
    "#file_picker.observe(change_input, 'value')\n",
    "file_uploader.observe(on_file_upload, 'value')\n",
    "\n",
    "vbox"
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