PrimitiveBoundsHandle.DrawHandle

描述

使用实例的当前配置在当前手柄摄像机中显示此实例的函数。

在调用此函数之前始终将属性写入手柄。在 EditorGUI.BeginChangeCheck 和 EditorGUI.EndChangeCheck 中调用此函数，以检测用户交互并从手柄中读取更新后的属性。\ \ 以下组件定义了具有 Bounds 属性的对象。

using UnityEngine;

public class BoundsExample : MonoBehaviour
{
    public Bounds bounds { get { return m_Bounds; } set { m_Bounds = value; } }
    [SerializeField]
    private Bounds m_Bounds = new Bounds(Vector3.zero, Vector3.one);
}

借助以下自定义编辑器，用户可以在 Scene View 中编辑此组件的边界属性。

using UnityEditor;
using UnityEditor.IMGUI.Controls;
using UnityEngine;

[CustomEditor(typeof(BoundsExample)), CanEditMultipleObjects]
public class BoundsExampleEditor : Editor
{
    private BoxBoundsHandle m_BoundsHandle = new BoxBoundsHandle();

    // the OnSceneGUI callback uses the Scene view camera for drawing handles by default
    protected virtual void OnSceneGUI()
    {
        BoundsExample boundsExample = (BoundsExample)target;

        // copy the target object's data to the handle
        m_BoundsHandle.center = boundsExample.bounds.center;
        m_BoundsHandle.size = boundsExample.bounds.size;

        // draw the handle
        EditorGUI.BeginChangeCheck();
        m_BoundsHandle.DrawHandle();
        if (EditorGUI.EndChangeCheck())
        {
            // record the target object before setting new values so changes can be undone/redone
            Undo.RecordObject(boundsExample, "Change Bounds");

            // copy the handle's updated data back to the target object
            Bounds newBounds = new Bounds();
            newBounds.center = m_BoundsHandle.center;
            newBounds.size = m_BoundsHandle.size;
            boundsExample.bounds = newBounds;
        }
    }
}

另请参阅：Editor.OnSceneGUI、Handles.SetCamera。