Unity编辑器中分割线拖拽的实现

GUI splitter control

How can I make a GUI splitter control, similar to the splitter the console has?

 using UnityEngine;
  using UnityEditor;

  public class GUISplitter : EditorWindow {
      Vector2 posLeft;
      Vector2 posRight;
      GUIStyle styleLeftView;
      GUIStyle styleRightView;
      float splitterPos;
      Rect splitterRect;
      Vector2 dragStartPos;
      bool dragging;
      float splitterWidth = ;

      // Add menu named "My Window" to the Window menu
      [MenuItem ("GUI/GUISplitter")]
      static void Init () {
             GUISplitter window = (GUISplitter)EditorWindow.GetWindow (
                 typeof (GUISplitter));
          window.position = new Rect(, , ,);
          window.splitterPos = ;
      }

      void OnGUI (){
          if (styleLeftView == null)
              styleLeftView = new GUIStyle(GUI.skin.box);
          if (styleRightView == null)
              styleRightView = new GUIStyle(GUI.skin.button);

          GUILayout.BeginHorizontal ();

          // Left view
          posLeft = GUILayout.BeginScrollView (posLeft,
              GUILayout.Width (splitterPos),
              GUILayout.MaxWidth(splitterPos),
              GUILayout.MinWidth(splitterPos));
              GUILayout.Box ("Left View",
                      styleLeftView,
                      GUILayout.ExpandWidth(true),
                      GUILayout.ExpandHeight(true));
          GUILayout.EndScrollView ();

          // Splitter
          GUILayout.Box ("",
              GUILayout.Width(splitterWidth),
              GUILayout.MaxWidth (splitterWidth),
              GUILayout.MinWidth(splitterWidth),
              GUILayout.ExpandHeight(true));
          splitterRect = GUILayoutUtility.GetLastRect ();

          // Right view
          posRight = GUILayout.BeginScrollView (posRight,
              GUILayout.ExpandWidth(true));
              GUILayout.Box ("Right View",
              styleRightView,
              GUILayout.ExpandWidth(true),
              GUILayout.ExpandHeight(true));
          GUILayout.EndScrollView ();

          GUILayout.EndHorizontal ();

          // Splitter events
          if (Event.current != null) {
              switch (Event.current.rawType) {
                  case EventType.MouseDown:
                      if (splitterRect.Contains (Event.current.mousePosition)) {
                          Debug.Log ("Start dragging");
                          dragging = true;
                      }
                      break;
                  case EventType.MouseDrag:
                      if (dragging){
                          Debug.Log ("moving splitter");
                          splitterPos += Event.current.delta.x;
                          Repaint ();
                      }
                      break;
                  case EventType.MouseUp:
                      if (dragging){
                          Debug.Log ("Done dragging");
                          dragging = false;
                      }
                      break;
              }
          }
      }
  }

原文链接:https://answers.unity.com/questions/461391/gui-splitter-control.html