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GUIUtility.hotControl

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public static var hotControl: int;
public static int hotControl;

Description

The controlID of the current hot control.

The hot control is one that is temporarily active. When the user mousedown's on a button, it becomes hot.
No other controls are allowed to respond to mouse events while some other control is hot.
once the user mouseup's, the control sets hotControl to 0 in order to indicate that other controls can now respond to user input.

    // Click on the button to see the id

function OnGUI() { GUILayout.Button("Press Me!"); Debug.Log("id: " + GUIUtility.hotControl); }
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void OnGUI() { GUILayout.Button("Press Me!"); Debug.Log("id: " + GUIUtility.hotControl); } }