GUIUtility.hotControl

IMGUI中每个可点击(交互)的控件都会有一个controlID, 一般在mouseDown的时候设置, mouseUp的时候清除。

 

#if UNITY_EDITOR

using UnityEditor;
using UnityEngine;

public class TestHotControlIdWindow : EditorWindow
{
    [MenuItem("MyTools/TestHotControlIdWindow")]
    public static void ShowWindow()
    {
        EditorWindow.GetWindow<TestHotControlIdWindow>(false, "TestHotControlIdWindow", true).Show();
    }

    private Vector3 m_Scale = Vector3.one;
    private Quaternion m_Rot = Quaternion.identity;
    private float m_Radius = 2.0f;

    private void OnEnable()
    {
        SceneView.onSceneGUIDelegate -= OnMySceneGUI;
        SceneView.onSceneGUIDelegate += OnMySceneGUI;
    }

    private void OnDisable()
    {
        SceneView.onSceneGUIDelegate -= OnMySceneGUI;
    }

    private void OnMySceneGUI(SceneView sceneView)
    {
        var curEvt = Event.current;

        var hotControl1 = GUIUtility.hotControl;
        var evtType1 = curEvt.type;

        //控制柄控件
        Handles.color = Color.blue;

        var pos = new Vector3(-5, 0, 0);
        float handleSize = HandleUtility.GetHandleSize(pos);

        m_Scale = Handles.ScaleHandle(m_Scale, pos, Quaternion.identity, handleSize); //缩放控制柄

        pos.x -= 6;
        m_Rot = Handles.RotationHandle(m_Rot, pos); //旋转控制柄

        pos.x -= 6;
        m_Radius = Handles.RadiusHandle(Quaternion.identity, pos, m_Radius); //半径控制柄

        //gui控件
        GUILayout.BeginArea(new Rect(40, 20, 200, 300), "test");
        GUILayout.Button("Button");
        GUILayout.Label("Label Text");
        GUILayout.EndArea();

        if (evtType1 == EventType.MouseMove)
        {
            curEvt.Use(); //调用后, curEvtType会变为Used
        }

        var hotControl2 = GUIUtility.hotControl;
        var evtType2 = curEvt.type;
        if (evtType1 == EventType.Repaint || evtType1 == EventType.Layout)
        {
            //no log
        }
        else
        {
            if (evtType1 == EventType.MouseDown)
            {
                Debug.Log($"hotControl 111:{hotControl1}, {hotControl2}; evtType:{evtType1}, {evtType2}");
            }
            else if (0 != hotControl1)
            {
                Debug.Log($"hotControl 222:{hotControl1}, {hotControl2}; evtType:{evtType1}, {evtType2}");
            }
        }

    }

}

#endif

在Scene视图中点击空白位置, hotControl也是有值的, 是Scene视图本身就属于一个控件么？