Add FoldableContainer Node

[WhalesState]

Bugsquad edit: closes godotengine/godot-proposals#8974

A Container similar to EditorInspector Sections!

FoldableContainer.mp4

WIP!
1- Generate class docs.
2- Allow RTL text orientation.
3- Allow text translation.
4- Add font outlines.
5- Add more advanced text styling [clipping text and fill alignment] to optionally respect the title width when text changes, similar to Button text behavior.

[WhalesState]

I have tried to override the theme stylebox with a null value for TabBar, and it throws this error only without pausing the game!
Condition "!p_style.is_valid()" is true. <C++ Source> scene\gui\control.cpp:2833 @ Control::add_theme_style_override()
and in TabBar it's only checking if the Tab icon is valid!
is it safe to use theme_cache.styleboxes directly without checking if they are valid?

[YuriSizov]

This needs a proposal.

[WhalesState]

This needs a proposal.

Yes, but it's still a work in progress since I'm learning more about TextLine class now, after finishing it we can discuss it's usability in a feature proposal, since it can be helpful for game menus, programs UI and the editor because it can replace the editor inspector sections and can be used in project and editor settings to simplify the UI.

[YuriSizov]

Well, we might reject the proposal because a foldable container can be easily done with a script, for example. So I would rather you not wasted your time unless you know this is desired.

Remember, proposal comes before a PR.

[WhalesState]

Well, we might reject the proposal because a foldable container can be easily done with a script, for example. So I would rather you not wasted your time unless you know this is desired.

Remember, proposal comes before a PR.

it will have a limitation with theming, this is why i have started it, i do have the same Container written in gdscript, and to customize it you need to create a custom_type, and if the project doesn't have a project_theme in project setting it will be hard to find the theme resource to add the custom_type to it, also you will have to keep the theme styleboxes, constants, colors, fonts as variables, and without a theme changing a stylebox property such as color it will not load since they don't have signals to emit to call queue_redraw() to redraw the styleboxes.

[KoBeWi]

without a theme changing a stylebox property such as color it will not load since they don't have signals to emit to call queue_redraw() to redraw the styleboxes.

Pretty sure you can use NOTIFICATION_THEME_CHANGED and connect to the stylebox changed signal if the notification alone doesn't suffice.

[Mickeon]

If you could roughly fill in the documentation it would be heavily appreciated. Since you are the one that developed the Node in the first place, it should be easier for you to document and note down any additional quirk, as well.
I can take a look at it for additional polish at a later time.

[AThousandShips]

Can't name the signal and the property the same

Edit: and also expanded is IMO a non-correct name as it happens when both collapsed and expanded, so something else like expansion_changed might be better, or folding_changed

I'd prefer flipping the condition though and call the property folded and have it be false by default

[WhalesState]

ok, I also was wondering about that error. Thank you all.

[WhalesState]

Sorry about the noise again, sometimes I forget to commit the changes before doing a force push.