HorizontalSliderWithBrowser: slider with play button

[EdgarGF93]

Checklist:

• The PR title is formatted as: <Module or Topic>: <Action> <Summary> (see contributing guidelines)

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This PR provides:

• A Play Button for the HorizontalSliderWithBrowser to play a "movie" with the frames along that axis
• ContextMenu with a Lineedit to change the frame per seconds, (the maximum is set by the rendering time per frame)
• ContextMenu with a SpinBox to set an interval between displayed frames (not one by one)

[EdgarGF93]

[t20100]

Thanks for the PR, it's a nice feature!

I left a few comments, mainly:

• Probably best to extend HorizontalSliderWithBrowser rather than using inheritance
• Improve the play settings menu to be discoverable and only available on the play button.

[t20100]

A square "stop" icon would makes more sense, or keeping the button checked while playing and uncheck it at the end.

[EdgarGF93]

Thanks Thomas, yesterday a user asked me if it would be possible to export this 'movie' as a file to use it in presentations. What do you think?

[t20100]

That sounds interesting!

There's something like this in silx.gui.plot3d:

silx/src/silx/gui/plot3d/actions/io.py

Line 192 in 1191989

class VideoAction(Plot3DAction):

It rotates the 3D scene and saves it as a list of *.png or as a .mng (the multi-image version of png).
It's not the best output formats for videos (need to be converted), but it doesn't need extra dependencies ;).

It would be good to output in a more common file format yet without a too cumbersome dependency....
I propose to do this in a different PR.

[t20100]

I made a few propositions of changes in EdgarGF93#2
I let you review it.

[EdgarGF93]

Thanks, Thomas, looks good to me

[t20100]

Looks good to me.

Nice feature!