How to detect when a single Area2D was touched / stop InputEvents propagation to overlapping objects

meffcio

Hey, I seem not to be able to grasp the idea of InputEvents propagation in Godot. I have prepared an example project to show you the problem I'm having.

So I have pointing/emulate_touch_from_mouse=true set in my project as I'd like to be able to deploy to mobile but test on the PC.

I have a set of shapes - squares in this instance - that are all Area2Ds. Whenever I click any of them I need it to disappear and send a signal that it's gone. Here's the code I'm using

func _input_event(viewport, event, shape_idx):
	if event is InputEventScreenTouch and event.is_pressed():
		print("_input_event(...)");
		queue_free()
		emit_signal("square_destroyed")
		get_tree().set_input_as_handled()

The problem is that whenever the squares overlap each other one InputEvent propagates to all of them (checked in the debugger that it's in fact the same event), despite the get_tree().set_input_as_handled() line at the end. Do I really need to create a cooldown timer for such functionality?

I tried defining an action in the input map, and using event.is_action_released(...), but then none of the squares get destroyed.

Thanks in advance.

TheDiavolo

If the game is for mobile the best idea I think would be to replace the Areas2D with a TouchScreenButton, basically it is used as for example the game controls for mobile

TwistedTwigleg

This might kinda be a roundabout way to handle it, but I think you can use the set_meta function on the input event after you have processed it. Then you could check using has_meta and if the data exists, skip processing the event. Here's the code:

extends Area2D

signal square_destroyed

func _ready():
	print("square created");

func _input_event(viewport, event, shape_idx):
	if event.has_meta("processed") == true:
		return;
	
	if event is InputEventScreenTouch and event.is_pressed():
		print("_input_event(...)");
		queue_free()
		emit_signal("square_destroyed")
		get_tree().set_input_as_handled()
		
		event.set_meta("processed", true);

I tested and it works, though it's perhaps a bit of a hack rather than proper solution.

BingBong

This MIGHT work, do you have in the collision shape, Resource > Local to scene turned on? This does solve other issues where every instance is affected when something happens to one.