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Docs: Describe Panel._addToPanelBox logic

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Describe what `Panel._addToPanelBox` does with the role and indicator it
gets.
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Julian 2021-05-12 14:11:25 +02:00
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docs/About_the_Top_(Menu)Bar.md
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@ -16,3 +16,14 @@ These functions basically make sure, that the top bar has a `Panel._leftBox`, `P
### Adding Items to the Top Bar
Extensions can add new items to the top bar using `Panel.addToStatusArea()`.
### About `Panel._addToPanelBox`
#### Indicator
`Panel._somethingBox` is an instance of [`St.BoxLayout`](https://gjs-docs.gnome.org/st10~1.0_api/st.boxlayout).
`Panel._addToPanelBox`, then uses `Panel._somethingBox.insert_child_at_index` (which is a method `Panel._somethingBox` inherits from [`Clutter.Actor`](https://gjs-docs.gnome.org/clutter7/clutter.actor)) to add an indicator container to the relevant box.
#### Role
`Panel._addToPanelBox` then saves the indicator into `Panel.statusArea` using the role as an index.