Source code for pyquickhelper.ipythonhelper.interact

"""
To add interactive widgets in a notebook and connect it to Python function,
Source: https://github.com/jakevdp/ipywidgets, the module was modified for Python 3
See notebook :ref:`havingaforminanotebookrst`.

Copyright (c) 2013, Jake Vanderplas
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:githublink:`%|py|35`
"""
from collections import OrderedDict
import itertools
import base64


[docs]def _get_html(obj): """ Get the HTML representation of an object :githublink:`%|py|43` """ # TODO: use displaypub to make this more general from IPython import get_ipython ip = get_ipython() if ip is not None: png_rep = ip.display_formatter.formatters['image/png'](obj) else: png_rep = None if png_rep is not None: # do not move this import to the root or # you will be exposed to the issue mentioned by # function fix_tkinter_issues_virtualenv import matplotlib.pyplot as plt if isinstance(obj, plt.Figure): plt.close(obj) # keep from displaying twice new_bytes = base64.b64encode(png_rep) new_str = new_bytes.decode("utf8") return '<img src="data:image/png;base64,{0}">'.format(new_str) else: return "<p> {0} </p>".format(str(obj)) rep = ip.display_formatter.formatters['text/html'](obj) if rep is not None: return rep elif hasattr(obj, '_repr_html_'): return obj._repr_html_()
[docs]class StaticInteract(object): """ Static Interact Object See notebook :ref:`havingaforminanotebookrst`. .. warning:: In order to be fast in the notebook, the function is called for every possible combination of values the controls can return. If it is a graph, all graphs are generared. :githublink:`%|py|83` """ template = """ <script type="text/javascript"> var mergeNodes = function(a, b) {{ return [].slice.call(a).concat([].slice.call(b)); }}; // http://stackoverflow.com/questions/914783/javascript-nodelist/17262552#17262552 function interactUpdate(div){{ var outputs = div.getElementsByTagName("div"); //var controls = div.getElementsByTagName("input"); var controls = mergeNodes(div.getElementsByTagName("input"), div.getElementsByTagName("select")); function nameCompare(a,b) {{ return a.getAttribute("name").localeCompare(b.getAttribute("name")); }} controls.sort(nameCompare); var value = ""; for(i=0; i<controls.length; i++){{ if((controls[i].type == "range") || controls[i].checked){{ value = value + controls[i].getAttribute("name") + controls[i].value; }} if(controls[i].type == "select-one"){{ value = value + controls[i].getAttribute("name") + controls[i][controls[i].selectedIndex].value; }} }} for(i=0; i<outputs.length; i++){{ var name = outputs[i].getAttribute("name"); if(name == value){{ outputs[i].style.display = 'block'; }} else if(name != "controls"){{ outputs[i].style.display = 'none'; }} }} }} </script> <div> {outputs} {widgets} </div> """ subdiv_template = """ <div name="{name}" style="display:{display}"> {content} </div> """
[docs] @staticmethod def _get_strrep(val): """ Need to match javascript string rep :githublink:`%|py|136` """ # TODO: is there a better way to do this? if isinstance(val, str): return val elif val % 1 == 0: return str(int(val)) else: return str(val)
[docs] def __init__(self, function, **kwargs): """ constructor :githublink:`%|py|148` """ # TODO: implement *args (difficult because of the name thing) # update names for name in kwargs: kwargs[name] = kwargs[name].renamed(name) self.widgets = OrderedDict(kwargs) self.function = function
[docs] def _output_html(self): """ html output :return: string :githublink:`%|py|162` """ names = [name for name in self.widgets] values = [widget.values() for widget in self.widgets.values()] defaults = tuple([widget.default for widget in self.widgets.values()]) # Now reorder alphabetically by names so divnames match javascript names, values, defaults = zip(*sorted(zip(names, values, defaults))) results = [self.function(**dict(zip(names, vals))) for vals in itertools.product(*values)] divnames = [''.join(['{0}{1}'.format(n, self._get_strrep(v)) for n, v in zip(names, vals)]) for vals in itertools.product(*values)] display = [vals == defaults for vals in itertools.product(*values)] tmplt = self.subdiv_template return "".join(tmplt.format(name=divname, display="block" if disp else "none", content=_get_html(result)) for divname, result, disp in zip(divnames, results, display))
[docs] def _widget_html(self): """ :return: string :githublink:`%|py|187` """ return "\n<br>\n".join([widget.html() for name, widget in sorted(self.widgets.items())])
[docs] def html(self): """ Produce the HTML output, insert results from :meth:`_output_html <pyquickhelper.ipythonhelper.interact.StaticInteract._output_html>` and :meth:`_widget_html <pyquickhelper.ipythonhelper.interact.StaticInteract._widget_html>` and insert it into the template. :return: string :githublink:`%|py|197` """ return self.template.format(outputs=self._output_html(), widgets=self._widget_html())
[docs] def _repr_html_(self): """ Synonym for :meth:`html <pyquickhelper.ipythonhelper.interact.StaticInteract.html>`. :githublink:`%|py|204` """ return self.html()