add ipywidgets to install_requires (#638)

* add ipywidgets to install_requires

* test_movie_making.ipynb

* turn off conda build now

* using py3.6

.travis.yml

@@ -3,9 +3,9 @@ language: cpp
 matrix:
   include:
      - { os: linux, env: PYTHON_VERSION=2.7 }
-     - { os: linux, env: PYTHON_VERSION=3.4 }
-     - { os: linux, env: PYTHON_VERSION=3.5 CONDA_BUILD=True}
-     - { os: linux, env: PYTHON_VERSION=3.5 TESTJS=True}
+     - { os: linux, env: PYTHON_VERSION=3.6 }
+       # - { os: linux, env: PYTHON_VERSION=3.6 CONDA_BUILD=True} # turn on if ipywidgets=7 is built
+     - { os: linux, env: PYTHON_VERSION=3.6 TESTJS=True}
 
 sudo: true
 dist: trusty

nglview/tests/notebooks/api/test_movie_making.ipynb

@@ -0,0 +1,109 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "application/vnd.jupyter.widget-view+json": {
+       "model_id": "4a569424c063488b8d61fed66d2fb7b2",
+       "version_major": "2",
+       "version_minor": "0"
+      },
+      "text/plain": [
+       "A Jupyter Widget"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "[MoviePy] Building file ./test.gif with imageio\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      " 83%|████████▎ | 5/6 [00:00<00:00,  5.56it/s]\n"
+     ]
+    }
+   ],
+   "source": [
+    "import pytraj\n",
+    "import nglview as nv\n",
+    "\n",
+    "traj = pytraj.load(nv.datafiles.XTC, top=nv.datafiles.PDB)\n",
+    "view = nv.show_pytraj(traj[:5])\n",
+    "view"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "<nglview.contrib.movie.MovieMaker at 0x109757190>"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "maker = view._get_movie_maker()\n",
+    "maker"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "maker.output = './test.gif'\n",
+    "maker.make() # non-blocking call"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "![](./test.gif)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.13"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

setup.py

@@ -64,6 +64,8 @@ def enable_extentions():
         #    - permission denied? 
         print('Failed to enable extensions.')
         print('Skip. Tips: Do it yourself')
+        print('    nglview install')
+        print('    nglview enable')
 
 def js_prerelease(command, strict=False):
     """decorator for building minified js/css prior to another command"""
@@ -183,6 +185,9 @@ def run(self):
     'tests_require': [
         'pytest'
     ],
+    'install_requires': [
+        'ipywidgets>=7.0.b0',
+    ],
     'extras_require': {
         "ipywidgets": ["ipywidgets"],
         "simpletraj": ["simpletraj"],