HandleUtility.PickGameObject

参数

结果

游戏对象 当前位置下的游戏对象。

描述

选择与指定位置最接近的游戏对象。

HandleUtility.PickGameObject 不应在重新绘制时调用。在大多数情况下，适宜在 EventType.MouseDown 或 EventType.MouseUp 期间调用。

using UnityEditor;
using UnityEngine;

static class ShowHovered
{
    static GameObject m_LastHoveredObject, m_LastClickedObject;

    [InitializeOnLoadMethod]
    static void Init()
    {
        SceneView.duringSceneGui += OnSceneGUI;
    }

    static void OnSceneGUI(SceneView view)
    {
        var evt = Event.current;

        // Register a control so that if no other handle is engaged, we can use the event.
        var pickingControlId = GUIUtility.GetControlID(FocusType.Passive);
        HandleUtility.AddDefaultControl(pickingControlId);

        switch (evt.type)
        {
            case EventType.MouseMove:
            {
                var picked = HandleUtility.PickGameObject(evt.mousePosition, false);

                if (picked != m_LastHoveredObject)
                {
                    m_LastHoveredObject = picked;
                    SceneView.RepaintAll();
                }

                break;
            }

            case EventType.MouseDown:
            {
                // Make sure to check Tools.viewToolActive before consuming a mouse event, otherwise Scene navigation
                // controls will not work.
                if (!Tools.viewToolActive && HandleUtility.nearestControl == pickingControlId)
                {
                    GUIUtility.hotControl = pickingControlId;
                    evt.Use();
                }

                break;
            }

            case EventType.MouseUp:
            {
                // If the hotControl is not pickingControlId, that means another control has the rights to this event.
                if (GUIUtility.hotControl != pickingControlId)
                    return;

                var picked = HandleUtility.PickGameObject(evt.mousePosition, false);

                if (picked != m_LastClickedObject)
                {
                    m_LastClickedObject = picked;
                    SceneView.RepaintAll();
                }

                // Make sure to Use() and reset the hotControl the event if we are the active control ID.
                evt.Use();
                GUIUtility.hotControl = 0;
                break;
            }
        }

        Handles.BeginGUI();
        GUILayout.BeginVertical(EditorStyles.helpBox, GUILayout.ExpandWidth(false));
        GUILayout.Label($"Last Hovered Object: {m_LastHoveredObject}");
        GUILayout.Label($"Last Clicked Object: {m_LastClickedObject}");
        GUILayout.EndVertical();
        Handles.EndGUI();
    }
}