Mouse over Label - Learn Godot 4 UI - no talking

Introduction

In this tutorial, we will learn how to create a mouse-over effect in Godot 4, which will display a description label when the mouse hovers over a UI element. This feature enhances user experience by providing additional context and information. By following these steps, you can implement this functionality in your own Godot projects.

Step 1: Setting Up the Scene

1. Open Godot 4 and Create a New Scene

   • Start by launching Godot and creating a new scene.
   • You can use a Control node as the root for your UI.

2. Add a Label Node

   • Right-click on the root node and select Add Child Node.
   • Choose the Label node to create a text label.
   • Set the label text to something like "Hover over me" to serve as your interactive element.

3. Adjust Label Properties

   • Select the Label node and adjust its properties in the Inspector.
   • Change the Visible property to false so it is hidden by default.

Step 2: Adding Mouse Over Functionality

1. Add the Mouse Area Node

   • Right-click on the root Control node and select Add Child Node.
   • Choose the Area2D node. This will track mouse events.

2. Add a Collision Shape

   • With the Area2D node selected, add a CollisionShape2D as a child.
   • Set the shape to a rectangle or circle that fits around your label. This defines the area that will trigger the mouse events.

3. Connect Signals

   • Select the Area2D node and go to the Node panel.
   • Right-click on the mouse_entered signal and choose Connect.
   • Connect it to the root node or a script attached to it.

4. Write the Mouse Entered Function

   • In the connected function, write the following code to show the label when the mouse enters the area:

   func _on_Area2D_mouse_entered():
       $Label.visible = true
   

5. Connect the Mouse Exited Signal

   • Repeat the connection process for the mouse_exited signal.
   • In this function, write the code to hide the label:

   func _on_Area2D_mouse_exited():
       $Label.visible = false
   

Step 3: Testing Your Implementation

1. Run the Scene

   • Click the Play button to test your scene.
   • Move the mouse over the designated area to observe the label appearing and disappearing.

2. Adjustments

   • If the label does not appear as expected, check the collision shape size and ensure it covers the area properly.
   • Customize the label’s text and style to fit your design.

Conclusion

In this tutorial, you learned how to set up a mouse-over label in Godot 4. By using Area2D and signals, you can enhance interactivity in your UI. Experiment with different designs and functionalities to create engaging user experiences in your projects. Next steps could include adding animations to the label or integrating this feature into a larger UI system.