Widget demo example script

[GenevieveBuckley]

I thought it would be good to have an easy to run example script showcasing all the widget types supported by magicgui.

Right now there's nowhere in the docs or examples that explains all the different types of widgets you can have. I personally learnt most of what I know about the Gooey from their widget demo script, so that's a big motivation to include something similar here.

[tlambert03]

love it! I was gonna say add a slider... but I think we need to have our own API for that (rather than using "widget_type: QSlider"). So lets' add that once we have it.

thanks!

[GenevieveBuckley]

love it! I was gonna say add a slider... but I think we need to have our own API for that (rather than using "widget_type: QSlider"). So lets' add that once we have it.

I forgot about sliders! I'm not sure what you mean by "we need to have our own API... let's add that once we have it", can you elaborate? Ideally I'd like to include as many things as possible into the examples.

[tlambert03]

I mean that every feature should have some “magicgui” representation/API that we wouldn’t mind reusing even if we switched to another backend. So we should be able to do widget_type=slider where “slider” means something special in magicgui. Not for this PR of course... just that I’ve never liked how you’re supposed to ask for a slider. (I imagine there are other cases too, where there are multiple suitable widgets for a given type)

[codecov]

Codecov Report

Merging #36 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   95.82%   95.77%   -0.05%     
==========================================
  Files          14       14              
  Lines         934      923      -11     
==========================================
- Hits          895      884      -11     
  Misses         39       39              

Impacted Files	Coverage Δ
magicgui/_tests/test_magicgui.py	92.06% <0.00%> (-0.13%)	⬇️
magicgui/_qt/widgets/file_dialog.py	93.75% <0.00%> (-0.10%)	⬇️
magicgui/_qt/_qt.py	95.06% <0.00%> (-0.07%)	⬇️
magicgui/_tests/test_ qt.py	98.93% <0.00%> (-0.05%)	⬇️

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[jni]

Love it!

[tlambert03]

I'm going to merge this, we can continue to embellish this example as the "showroom" script as we add more widgets and/or simplify the API. thanks @GenevieveBuckley