Often I use sliders from ipywidgets both for numeric data (IntSlider) and
for selection (SelectionSlider). When I need to go over several consequent
slider values it is convenient to have buttons like next/prev step, and as
ipywidgets doesn't provide anything like this I implemented it myself:
import ipywidgets as iw
slider = iw.SelectionSlider(options=['a', 'b', 'c', 'd', 'e'])
btn_prev = iw.Button(description='<')
btn_prev.layout.width = '32px'@btn_prev.on_clickdef _(*_):
ind = slider.options.index(slider.value)
if ind > 0:
slider.value = slider.options[ind - 1]
btn_next = iw.Button(description='>')
btn_next.layout.width = '32px'@btn_next.on_clickdef _(*_):
ind = slider.options.index(slider.value)
if ind < len(slider.options) - 1:
slider.value = slider.options[ind + 1]
def upd_btns_state(*_):
btn_prev.disabled = slider.value == slider.options[0]
btn_next.disabled = slider.value == slider.options[-1]
slider.observe(upd_btns_state, 'value')
upd_btns_state()
display(iw.HBox(children=[btn_prev, slider, btn_next]))
This basically works (not for dict as options through, but that's not
difficult to add), but I have to paste this code everywhere I need a
slider, and can't use it with interact.
What I think I need is make a widget which contains all this stuff and
exposes only value, like a plain SelectionSlider. However, I couldn't find
any docs about how to implement this anywhere (documentation on creating
custom widgets addresses only making a widget from scratch, including
html/javascript code) - any ideas?
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