Unity编辑器扩展-拖拽调整区域大小_限制unity在编辑器中拖拽物体的移动单位

using UnityEngine;
using UnityEditor;

public class ExampleEditorWindow : EditorWindow
{
    private Vector2 lScrollPosition, rScrollPosition;
    //分割线宽度
    private const float splitterWidth = 2f;
    //分割线位置
    private float splitterPos;
    private Rect splitterRect;
    //是否正在拖拽分割线
    private bool isDragging;

    [MenuItem("Tools/Example Editor Window")]
    public static void Open() {
        GetWindow<ExampleEditorWindow>().Show();
    }

    private void OnEnable() {
        splitterPos = position.width * .3f;
    }

    internal void OnGUI() {
        GUILayout.BeginHorizontal();
        {
            lScrollPosition = GUILayout.BeginScrollView(lScrollPosition , GUILayout.Width(splitterPos) , GUILayout.MaxWidth(splitterPos) , GUILayout.MinWidth(splitterPos));
            OnLeftGUI();
            GUILayout.EndScrollView();

            //分割线
            GUILayout.Box(string.Empty , GUILayout.Width(splitterWidth) , GUILayout.MaxWidth(splitterWidth) , GUILayout.MinWidth(splitterWidth) , GUILayout.ExpandHeight(true));
            splitterRect = GUILayoutUtility.GetLastRect();

            rScrollPosition = GUILayout.BeginScrollView(rScrollPosition , GUILayout.ExpandWidth(true));
            OnRightGUI();
            GUILayout.EndScrollView();
        }
        GUILayout.EndHorizontal();

        if (Event.current != null) {
            //光标
            EditorGUIUtility.AddCursorRect(splitterRect , MouseCursor.ResizeHorizontal);
            switch (Event.current.rawType) {
                //开始拖拽分割线
                case EventType.MouseDown:
                isDragging = splitterRect.Contains(Event.current.mousePosition);
                break;
                case EventType.MouseDrag:
                if (isDragging) {
                    splitterPos += Event.current.delta.x;
                    //限制其最大最小值
                    splitterPos = Mathf.Clamp(splitterPos , position.width * .2f , position.width * .8f);
                    Repaint();
                }
                break;
                //结束拖拽分割线
                case EventType.MouseUp:
                if (isDragging)
                    isDragging = false;
                break;
            }
        }
    }
    private void OnLeftGUI() {
        for (int i = 0 ; i < 10 ; i++) {
            if (GUILayout.Button("左侧按钮")) {
                Debug.Log("左侧按钮按下");
            }
        }
    }

    private void OnRightGUI() {
        if (GUILayout.Button("右侧按钮")) {
            Debug.Log("右侧按钮按下");
        }
    }
}
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