GUILayoutUtility.GetLastRect

Returns

Rect The last used rectangle.

Description

Get the rectangle last used by GUILayout for a control.

Note that this only works during the Repaint event.

    function OnGUI() {
        GUILayout.Button( "My button" );
        if(Event.current.type == EventType.Repaint &&
           GUILayoutUtility.GetLastRect().Contains(Event.current.mousePosition )) {
            GUILayout.Label( "Mouse over!" );
        } else {
            GUILayout.Label( "Mouse somewhere else" );
        }
    }

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnGUI() {
        GUILayout.Button("My button");
        if (Event.current.type == EventType.Repaint && GUILayoutUtility.GetLastRect().Contains(Event.current.mousePosition))
            GUILayout.Label("Mouse over!");
        else
            GUILayout.Label("Mouse somewhere else");
    }
}