Version: 2023.2
public static void AddControl (int controlId, float distance);

参数

controlId The ID that is recorded as the nearest control if the mouse cursor is near the handle.
distance The distance from the mouse cursor to the handle.

描述

记录从手柄到测量点的距离。

所有手柄都会在布局期间使用它们的 controlID 调用此方法,然后使用 nearestControl 检查它们是否获得 mouseDown。

using UnityEngine;
using UnityEditor;

public class ExampleScript : MonoBehaviour
{
    public float value = 1.0f;
}

// A tiny custom editor for ExampleScript component.
[CustomEditor(typeof(ExampleScript))]
public class ExampleEditor : Editor
{
    // Custom in-scene UI for when ExampleScript component is selected.
    public void OnSceneGUI()
    {
        var controlID = GUIUtility.GetControlID(FocusType.Passive);
        var evt = Event.current;

        var t = target as ExampleScript;
        var tr = t.transform;
        var pos = tr.position;

        switch (evt.GetTypeForControl(controlID))
        {
            case EventType.Layout:
            case EventType.MouseMove:
                // Set the nearest control ID to "controlID" if the mouse cursor is
                // near or directly above the solid disc handle.
                var distanceToHandle = HandleUtility.DistanceToCircle(pos, t.value);
                HandleUtility.AddControl(controlID, distanceToHandle);
                break;
            case EventType.MouseDown:
                // Log the nearest control ID if the click is near or directly above
                // the solid disc handle.
                if (controlID == HandleUtility.nearestControl && evt.button == 0)
                {
                    Debug.Log($"The nearest control is {controlID}.");

                    GUIUtility.hotControl = controlID;
                    evt.Use();
                }
                break;
            case EventType.MouseUp:
                if (GUIUtility.hotControl == controlID && evt.button == 0)
                {
                    GUIUtility.hotControl = 0;
                    evt.Use();
                }
                break;
            case EventType.Repaint:
                // Display an orange solid disc where the object is.
                Handles.color = new Color(1, 0.8f, 0.4f, 1);
                Handles.DrawSolidDisc(pos, tr.up, t.value);
                break;
        }
    }
}