Source code for nglview.layout
# TODO: reorg
# simplify code
from ipywidgets import Box, Button, Label, Layout, Tab, ToggleButton
def _make_box_layout(width='100%'):
return Layout(display='flex',
flex_flow='column',
align_items='stretch',
width=width)
def _relayout(box, form_item_layout):
form_items = []
for kid in box.children:
if hasattr(kid,
'description') and not isinstance(kid,
(Button, ToggleButton)):
label_value = kid.description
kid.description = ''
else:
label_value = ''
if isinstance(kid, Button):
box2 = Box([
kid,
], layout=form_item_layout)
else:
box2 = Box([Label(value=label_value), kid],
layout=form_item_layout)
form_items.append(box2)
return form_items
def _relayout_master(box, width='20%'):
"""make nicer layout for box.
This method will take the `description` of each child to make corresponding Label
The `description` will be cleared.
"""
old_children = box.children[:]
form_items = _relayout(box, make_form_item_layout())
form = Box(form_items, layout=_make_box_layout(width=width))
form._ngl_children = old_children
return form
def _make_autofit(box):
'''
Parameters
----------
box : ipywidgets.Box
children is a list of buttons
Returns
-------
relayouted box
'''
items_layout = Layout(flex='1 1 auto', width='auto')
box.layout = items_layout
return box
def _make_delay_tab(box_factory, selected_index=0):
"""
Parameters
----------
box_factory : list of (func, tab_name)
Example of box_factory: [(_make_gen_box, 'General'),
(_make_repr_box, 'Representation')]
"""
tab = Tab([Box() for box, _ in box_factory])
[tab.set_title(i, title) for i, (_, title) in enumerate(box_factory)]
# trick
if not tab.children[selected_index].children:
tab.selected_index = 1
def on_update_selected_index(change):
index = change['new']
if not tab.children[index].children:
# make widget on demand
tab.children[index].children = [
box_factory[index][0](),
]
tab.observe(on_update_selected_index, names='selected_index')
# trigger
tab.selected_index = selected_index
return tab