Add support for progress slider widget

[mixxxbot]

Reported by: esbrandt
Date: 2015-04-14T19:31:13Z
Status: Confirmed
Importance: Wishlist
Launchpad Issue: lp1444121
Tags: skin

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This is a request to extend the existing <SliderComposed> widget functionality to allow for sequential <Slider> background images, like we have it in the <Knob> widget.

This would combine the best from both worlds. <Slidercomposed> works horizontal or vertical and allows scaling [1],  while <Knob> can load sequential images.

Usage

• A progress bar can indicate, well progress, if space is tight e.g. replacing the small waveform overview and its tiny play position indicator.

• A progress bar slider can improve visibility by a factor. Currently it is hard to see the actual position of the line/crossfader handle at a glance.

• A progress bar slider can also replace a rotary knob, if necessary.

  Example (crossfader)

  old: ---|-----------------
  new: ---|=======----------

Demo

http://bootstrapmaster.com/live/simpliq2/ui-sliders-progress.html

[1] #426

[mixxxbot]

Commented by: ferranpujolcamins
Date: 2015-07-22T22:16:12Z

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I've implemented a different approach for WKnobComposed in PR #⁠645 (#645).
I added an additional Pixmap that is masked according to the position of the knob.

Would something like this suit your needs?