ScrollBar no highlight in 3D

[rakkarage]

Tested versions

Reproducible in:

• v4.4.dev.custom_build [4c4e673]
• v4.3.stable.official [77dcf97]

Works in:

• v4.2.stable.official [46dc277]

System information

Godot v4.3.stable - Ubuntu 24.04.1 LTS 24.04 - Wayland - Vulkan (Forward+) - dedicated AMD Radeon RX 6600 (RADV NAVI23) - 12th Gen Intel(R) Core(TM) i5-12400F (12 Threads)

Issue description

In the gui_in_3d demo the mouse over highlight works on buttons and sliders, but if you add a scroll bar it does not show mouseover highlight for scroll bar?

https://github.com/godotengine/godot-demo-projects/blob/master/viewport/gui_in_3d/gui_3d.gd

• It works when the ui is extracted to a 2d scene and run like that. scroll bar shows mouse over highlight. But in 3D not work?
• It works fine for buttons and sliders.
• It shows the highlight sometimes if you click around on the bar to move the grabber around a bit and then correctly un-highlights when move off bar… but should show on mouse over like it does for other controls?

Thanks.

Steps to reproduce

• make a control scene with a scroll bar, note highlight works
• put it in 3d, note it not

Minimal reproduction project (MRP)

https://github.com/rakkarage/test-grabber

[AThousandShips]

Sounds like this issue:

• Pushing events to Viewports no longer triggers InputEventMouseMotion in _gui_input #89757

[rakkarage]

Thanks. It does seem kinda familiar, but since the highlight works for buttons and sliders, and example not directly using _gui_input idk...

[Sauermann]

ScrollBar uses a more sophisticated approach for highlighting in comparison to buttons and sliders (it uses gui_input).

If #99890 gets merged, your MRP can be adjusted like this in order to resolve the problem:

func _ready() -> void:
	_area.input_event.connect(_on_input_event)
	_area.mouse_entered.connect(_viewport.notify_mouse_entered)
	_area.mouse_exited.connect(_viewport.notify_mouse_exited)