feat: Add sink availability indicator with blinking light

[Tusharjamdade]

Changes

• 🎁 Added available export variable to Scripts/sink.gd to control sink status (defaults to true).
• 🎁 Added a visual IndicatorLight (centered green circle) to Scenes/sink.tscn.
• 🎁 Implemented a blinking animation in _process that activates only when the sink is available.
• 🐛 Set mouse_filter = 2 (Ignore) on the indicator light so it does not block mouse clicks on the sink.

/kind

Fixes #65

Release Note

Added a blinking green indicator light to sinks to visually represent their availability status.

Docs

[knative-prow]

@Tusharjamdade: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

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In response to this:

Changes

• 🎁 Added available export variable to Scripts/sink.gd to control sink status (defaults to true).
• 🎁 Added a visual IndicatorLight (centered green circle) to Scenes/sink.tscn.
• 🎁 Implemented a blinking animation in _process that activates only when the sink is available.
• 🐛 Set mouse_filter = 2 (Ignore) on the indicator light so it does not block mouse clicks on the sink.

/kind

Fixes #65

Release Note

Added a blinking green indicator light to sinks to visually represent their availability status.

Docs

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[knative-prow]

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[Tusharjamdade]

Hi @Cali0707 and @ankitajana21,

I’ve added a green indicator to show the availability of the sink, as demonstrated in the video below. This functionality works consistently across all levels.

Please take a look and let me know if any changes are needed.

2026-01-30.00-23-26.mp4

[iwdie]

Hi @Tusharjamdade ,
Thanks for working on this!!
I think it works fine overall, but I have a small suggestion. The light becomes invisible when an event gets in the sink . The simplest fix might be to shift it to the right side. You could also adjust the Z-index, but I wouldn’t recommend that.
I also don’t think using a Panel node for the light was the best approach. Using a ColorRect would have been a better option, since UI nodes sometimes cause issues, and you wouldn’t have needed to set mouse_filter to Ignore. It still works fine though!

[Tusharjamdade]

Hi @iwdie,

I previously tested adding the indicator on the right side, but it didn’t make much sense visually, so I moved it to the center.

Also, added mouse_filter so that mouse clicks pass through the indicator to the component below it (the sink), which might be helpful in case of misclicks on the indicator, since it is placed at the center.

[knative-prow-robot]

PR needs rebase.

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