UI Toolkit mouse dragging label sample 🖱️

using UnityEditor;
using UnityEditor.UIElements;
using UnityEngine.UIElements;

[CustomEditor(typeof(MouseDraggerScript))]
public class MouseDraggerScriptEditor : Editor
{
    public override VisualElement CreateInspectorGUI()
    {
        VisualElement root = new VisualElement();
        
        // When creating a float field with a label a mouse dragger will automatically be added on the label.
        // Let's creat a FloatField and set it's label to show it's behaviour
        FloatField floatFieldWithLabel = new FloatField();
        floatFieldWithLabel.label = "Float field label";

        // When creating a float field without a label a mouse dragger will not be added on the label.
        // Let's creat a FloatField without defining the label to show it's behaviour
        FloatField floatFieldWithoutLabel = new FloatField();

        // Let's first create the label that we will be using to add the FieldMouseDragger to
        Label mouseDraggingLabel = new Label();
        mouseDraggingLabel.text = "Dragging Label";

        // Then create the field that it will be connected to
        FloatField floatFieldWithMouseDragger = new FloatField();

        // Now we're going to create a mouse dragger
        // This needs the float field in the constructor and passing the data type in the angle brackets
        // As we're working with a FloatField this is float
        FieldMouseDragger<float> mouseDragger = new FieldMouseDragger<float>(floatFieldWithMouseDragger);

        //Next we just have to set what area will be used as the drag zone
        mouseDragger.SetDragZone(mouseDraggingLabel);

        // This will already work but it won't change the cursor, for that we need to add a uss class.
        // Add the uss class that will show it as a dragger on hover 
        mouseDraggingLabel.AddToClassList(BaseField<float>.labelDraggerVariantUssClassName);


        // Add all the fields to the editor 
        root.Add(floatFieldWithLabel);
        root.Add(floatFieldWithoutLabel);
        root.Add(mouseDraggingLabel);
        root.Add(floatFieldWithMouseDragger);

        return root;
    }
}

//The script can just be an empty script for this examples
public class MouseDraggerScript : MonoBehaviour
{
}