Add tracking property to sliders. When False, changed only emits on release.

[tlambert03]

closes #https://github.com/napari/magicgui/issues/234

This adds a 'tracking' property to sliders, following the naming set by Qt:

tracking : bool

This property holds whether slider tracking is enabled

---

If tracking is enabled (the default), the slider emits the valueChanged() signal while the slider is being dragged. If tracking is disabled, the slider emits the valueChanged() signal only when the user releases the slider.

from magicgui import magicgui


@magicgui(auto_call=True, input={"widget_type": "Slider", "tracking": False})
def slider(input=1):
    ...

[codecov]

Codecov Report

Merging #248 (ef87de0) into master (8dfe2e7) will increase coverage by 0.01%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
+ Coverage   90.69%   90.70%   +0.01%     
==========================================
  Files          28       28              
  Lines        3075     3100      +25     
==========================================
+ Hits         2789     2812      +23     
- Misses        286      288       +2     

Impacted Files	Coverage Δ
magicgui/backends/_qtpy/widgets.py	87.80% <85.71%> (-0.03%)	⬇️
magicgui/widgets/_concrete.py	84.17% <88.88%> (+0.13%)	⬆️
magicgui/widgets/_bases/slider_widget.py	89.28% <100.00%> (+3.57%)	⬆️
magicgui/widgets/_protocols.py	99.45% <100.00%> (+<0.01%)	⬆️

---

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[queenmatalie]

can i used used example ( the clock deblur example using napari & magicgui:) with real time.

[tlambert03]

I'm sorry, I'm not following... clarify?

[queenmatalie]

code clock deblur example using napari & magicgui:
can not run this code

AttributeError: No napari attribute types

[tlambert03]

Hi @queenmatalie, I'm sorry, I don't understand. If you'd like help running the example, you'll need to provide more information. What version of napari and magicgui are you running, exactly what code are you running, etc...

[queenmatalie]

Python 3.8.8 on windows 10 used this code on jupyter notebook
when command version napari on anaconda this result below:
'napari--version' is not recognized as an internal or external command,
operable program or batch file.

but another code is running and open window napari

[tlambert03]

you can't run the command napari in a jupyter notebook. it's a command line command. please have a look through the napari tutorials for an introduction to napari
https://napari.org/tutorials/fundamentals/index.html

[queenmatalie]

thank you , very much