_UnhandledInput method not working as I expect

February 12, 2022

I’m new learner of Godot Mono and I couldn’t understand why _UnhandledInput method does not work. I don’t get any error or warnings either.

using Godot;
using System;

public class GameScene : Node2D
{
    PackedScene towerPackedScene;

    public override void _Ready()
    {
        towerPackedScene = (PackedScene)GD.Load("res://Tower.tscn");
    }

    public override void _Process(float delta)
    {
                    
        
    }

    public override void _UnhandledInput(InputEvent @event)
    {
        if (@event is InputEventMouseButton mouseButton)
        {
            GD.Print("clicked"); // does not show message on output
            KinematicBody2D tower = (KinematicBody2D)towerPackedScene.Instance();
            tower.Position = mouseButton.Position;
            this.AddChild(tower);
        }
    }
}

>Solution :

Presumably the input is not unhandled. In other words, some other node is taking the input (for example with _input).

You are looking for a mouse event. Is there some Control taking the mouse input? Be aware that Controls will take mouse input before other nodes, even if they are behind them. You need to set their mouse_filter to Ignore.

A common gotcha is using a ColorRect or TextureRect for background, and leave it with mouse_filter set to Stop (which is the default), and then being unable to get input.

See Using InputEvent