Can't determine when viewport or window size changes

[davidicus]

Godot Version

4.3 Stable

Question

I have tried both of these in a node, in the root node, and in my global autoload singleton. I resize the window repeatedly, but the functions never print my debug text, so I guess they never fire.

Is there a better way? Ultimately, I’m trying to fix an off-screen indicator that disappears off the right and bottom screen edges when the window is resized or maximized. I run it in viewport stretch mode, keeping aspect.

get_tree().get_root().size_changed.connect(update_window) # window has been resized
get_viewport().size_changed.connect(update_viewport) # viewport size has changed

[teotigraphix]

@davidicus

get_tree().get_root().size_changed.connect(update_window)

In a simple project I just tried:

func _ready() -> void:
	get_tree().get_root().size_changed.connect(update_window)

func update_window():
	print("Foo")

Must be something with the stretch mode then, mine was set to disabled

[teotigraphix]

Ah doesn’t seem to fire with stretch_mode equal viewport.

[davidicus]

Thanks for trying! I get that the pixel dimensions might be considered the same in that mode, but I don’t know why the offscreen indicator would break if the viewport or window weren’t considered different.

[Sauermann]

Stretch mode means, that the size of the viewport doesn’t change, when the size of the window changes and the Viewport.size_changed signal acts on viewport size changes.

You should overwrite the _notification function of the window and listen for NOTIFICATION_WM_SIZE_CHANGED. (to achieve this, this project could help)

The following proposal and pull request might also be of interest to you, if you compile the engine yourself.

• Notify users about window size changes · Issue #8788 · godotengine/godot-proposals · GitHub
• Add `window_size_changed` signal by kubasobon · Pull Request #87210 · godotengine/godot · GitHub

[teotigraphix]

That is nice that the low level _notification() works, cool. Nice to know. So many things to take into account.

[davidicus]

For any future searchers, I had to rethink things because get_viewport().size doesn’t account for window scale. I solved by comparing get_viewport().get_visible_rect().size instead (I wasn’t even aware of that one at the time).