[Slider] Add support for secondary track

[Tolriq]

Is your feature request related to a problem? Please describe.

I want to be able to show the cache buffer in a slider that allows to control a player. The value is informational and should not limit the ability to slide to values larger than the buffer.

Describe the solution you'd like Behave like SeekBar and propose a secondary track to represent that value to users.

Describe alternatives you've considered As all is private there's no way to implement that by extending the slider, alternative are seekbar with custom labels.

[wcshi]

Hi @Tolriq could you please share a mock of what you had in mind?

[Tolriq]

More or less like the normal android SeekBar/ProgressBar when using secondary Progress

https://developer.android.com/reference/android/widget/ProgressBar.html#attr_android:secondaryProgress

Defines the secondary progress value, between 0 and max. This progress is drawn between the primary progress and the background. It can be ideal for media scenarios such as showing the buffering progress while the default progress shows the play progress.

But handling of the round corners and all the shiny material :)

[matpag]

This would be a nice feature to have. It would solve the Slider as "track player" use case.

[dovahkiin98]

It's a nice feature, but doesn't adding a Slider with a LinearProgressBar below it give the same behavior and look?

[Tolriq]

Not at all, proper positioning is complex due to rounding issues, it adds another view and most important it's drawn under so you always have the slider inactive track paint over when the wanted effect is the opposite.

[jimiduiveman-npo]

This feature would make sense indeed, what are the latest findings on this request?

[MusabAlothman]

Agree, feature is needed

[ag2s20150909]

Agree, feature is needed

[Ygor8686]

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[Ygor8686]

I'm an .com.droit'

[Ygor8686]

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