feat: add subtitle size and position controls

[aditya0155]

Pull Request Type

• Feature

Related Issue

Partially closes #968 (check additional context)

Description

This PR brings Shaka’s built-in subtitle style controls directly into FreeTube’s video player.

After this PR, when you’re watching a video, you can tweak the subtitle size and move the subtitles up or down—straight from the player menu. To keep things solid, this uses Shaka’s native captions-position and captions-size controls.

Also, FreeTube saves your preferences. So if you change the subtitle size or reposition them, FreeTube remembers what you picked by saving fontScaleFactor and positionArea in your defaultCaptionSettings. Next time you watch a video or restart the player, your subtitles will look just how you left them.

And to make sure nothing breaks, the app double-checks your saved settings before loading them. If anything is corrupt or doesn’t make sense, the player just skips it and keeps working as usual.

Screenshots

Before:

Before.The.Pr.mp4

After:

After.The.Pr.1.mp4

Testing

1. Open any video that has subtitles available.
2. Turn the subtitles on.
3. Open the player menu.
4. Check that the new subtitle size and position controls are showing up.
5. Change the subtitle size (e.g., to 150%), and make sure the subtitles actually get bigger.
6. Change the subtitle position (e.g., to Center Right), and confirm they move over.
7. Open a different video and check that your new size and position settings carried over.
8. Reopen the menus to make sure the right options are still checked.
9. Test a video without captions to make sure the player still behaves normally.

Desktop

• OS: Windows
• OS Version: 11
• FreeTube version: 0.24.0

Additional Context

Update on Hover Previews: I’ve sent an upstream PR to Shaka Player (shaka-project/shaka-player#10077) to add live hover previews for subtitle styles. Having this in Shaka itself means FreeTube doesn’t need to change around with the DOM anymore. Once Shaka merges that PR and FreeTube updates its Shaka version, #968 will be natively fixed.

(requiring only a one line configuration toggle in FreeTube to enable the native preview)

[aditya0155]

quick update:

I submitted the upstream PR to Shaka Player (shaka-project/shaka-player#10077) to add native live hover previews for subtitle settings! I have also updated the PR body for this.

[aditya0155]

Final update:

The PR is merged now :)
shaka-project/shaka-player#10077

will make a new PR for integrating this feature when they release 5.2.0

[PikachuEXE]

Just update this PR to have that when 5.2.0 is out?

[aditya0155]

Just update this PR to have that when 5.2.0 is out?

Sure I'll make it draft till then