// Editor Window using UI Toolkit

// Custom tool window accessible from the Tools menu.

// Place in an Editor/ folder.

using UnityEditor;

using UnityEngine;

using UnityEngine.UIElements;

namespace MyGame.Editor

{

public class QuickPlacer : EditorWindow

{

[SerializeField] private VisualTreeAsset _layout;

private ObjectField _prefabField;

[MenuItem("Tools/Quick Placer")]

public static void ShowWindow()

{

var window = GetWindow<QuickPlacer>("Quick Placer");

window.minSize = new Vector2(300, 200);

}

public void CreateGUI()

{

var root = rootVisualElement;

root.Add(new Label("Quick Placer Tool")

{

style = { fontSize = 16, unityFontStyleAndWeight = FontStyle.Bold, marginBottom = 10 }

});

var prefabField = new UnityEditor.UIElements.ObjectField("Prefab to Place")

{

objectType = typeof(GameObject)

};

root.Add(prefabField);

var spacing = new FloatField("Grid Spacing") { value = 2f };

root.Add(spacing);

var placeButton = new Button(() =>

{

var prefab = prefabField.value as GameObject;

if (prefab == null)

{

Debug.LogWarning("Select a prefab first");

return;

}

var sceneView = SceneView.lastActiveSceneView;

if (sceneView == null) return;

var instance = (GameObject)PrefabUtility.InstantiatePrefab(prefab);

instance.transform.position = sceneView.pivot;

Selection.activeGameObject = instance;

Undo.RegisterCreatedObjectUndo(instance, "Place Prefab");

})

{

text = "Place at Scene View Center"

};

placeButton.style.marginTop = 10;

root.Add(placeButton);

}

}

}