I’m using Godot 4, and I want a special LineEdit control, which I can instantiate multiple times. Is it right to create a scene for it? I tried this, see here:
So there is a normal LineEdit, and then there is a Button as a child. I attached a script to the button, for implementing dragging on it. This works fine, and I can instantiate it as a node in other scenes.
But I also defined a signal, but I can’t see it in the Node tab to connect it to a script in the parent scene. How would I do this? And is this approach with a scene the right way to implement reusable components?
Yes, this is exactly what scenes are made for. Since the script is on your button, the signal is also on your button. To see the signal in a other scene, you have to either put the script on the LineEdit (this would require to change a lot of code) or you press right-click on the LineEdit in the other scene and activate “Editable Children”. Then you can click on the button and should see your signal
Could you just have the button’s signal instead connect to the root node (line edit) of the scene, and have it connect to a function that emits a custom signal of that root node?
So you would just need a script on the line edit that was a few lines long to define a signal and have a function that emits it?
Thanks, moving the script to the LineEdit worked. Wasn’t that much code.
It is a component, where the user can click on the (invisible) button, and then drag it to change the value of the underlying field. This is the current code:
extends LineEdit
signal value_changed(number)
var dragging = false
var ofs = 0
var current_number = 0
var start = 10
var end = 1000
var width = 200
func _ready():
pass
func _process(delta):
if dragging:
var x = get_global_mouse_position().x
var dx = x - ofs
ofs = x
var value_range = end - start
if value_range == 0:
dx = 0
else:
var pixels_per_value = value_range / width
dx *= pixels_per_value
current_number += dx
current_number = clampf(current_number, start, end)
_update_number_text()
emit_signal("value_changed", current_number)
func _update_number_text():
text = String.num(current_number)
func _on_button_down():
dragging = true
mouse_default_cursor_shape = Control.CURSOR_HSIZE
ofs = get_global_mouse_position().x
func _on_button_up():
mouse_default_cursor_shape = Control.CURSOR_ARROW
dragging = false
func init(start, end, number):
self.start = start
self.end = end
self.number = number
Might need some more code to synchronize text edits as well.
. Your solution would work, but its unneccessarily complicated