unity3D提供了自定义编辑器的接口

• 在Assets中新建一个C# 脚本，并让public类继承EditorWindow

  • using UnityEngine;
    using UnityEditor;
     
    public class ResizablePanels : EditorWindow
    {
     
    }

     

•  编辑器窗口需要初始化一个静态方法OpenWindow()，然后在这个窗口中获得一个窗口并添加标题， 仅靠静态方法是不够的，我们还需要添加一个按钮或类似的按钮，以使我们的用户在Unity中打开窗口。幸运的是，已经有一个名为MenuItem的属性，该属性可将菜单项添加到Unity的菜单栏中并运行应用于该菜单项的方法。

  • using UnityEngine;
    using UnityEditor;
     
    public class ResizablePanels : EditorWindow
    {
        [MenuItem("Window/Resizable Panels")]
        private static void OpenWindow()
        {
            ResizablePanels window = GetWindow();
            window.titleContent = new GUIContent("Resizable Panels"); // 添加标题
        }
    }

     

•  为了在窗口中绘制图案，我们需要调用OnGUI()方法，首先我们需要两个矩形来定义面板

  • using UnityEngine;
    using UnityEditor;
     
    public class ResizablePanels : EditorWindow
    {
        private Rect upperPanel;
        private Rect lowerPanel;
     
        [MenuItem("Window/Resizable Panels")]
        private static void OpenWindow()
        {
            ResizablePanels window = GetWindow();
            window.titleContent = new GUIContent("Resizable Panels");
        }
     
        private void OnGUI()
        {
            DrawUpperPanel();
            DrawLowerPanel();
        }
     
        private void DrawUpperPanel()
        {
        }
     
        private void DrawLowerPanel()
        {
        }
    }

     

• GUILayout.BeginArea（Rect rect）将创建一个矩形区域,GUILayout.EndArea（）标记结束。这些区域将定义我们的面板。我还将在两个区域中添加标签，以便我们可以看到它们的外观。

  • using UnityEngine;
    using UnityEditor;
     
    public class ResizablePanels : EditorWindow
    {
        private Rect upperPanel;
        private Rect lowerPanel;
     
        [MenuItem("Window/Resizable Panels")]
        private static void OpenWindow()
        {
            ResizablePanels window = GetWindow();
            window.titleContent = new GUIContent("Resizable Panels");
        }
     
        private void OnGUI()
        {
            DrawUpperPanel();
            DrawLowerPanel();
        }
     
        private void DrawUpperPanel()
        {
            upperPanel = new Rect(0, 0, position.width, position.height * 0.5f);
     
            GUILayout.BeginArea(upperPanel);
            GUILayout.Label("Upper Panel");
            GUILayout.EndArea();
        }
     
        private void DrawLowerPanel()
        {
            lowerPanel = new Rect(0, position.height * 0.5f, position.width, position.height * 0.5f);
     
            GUILayout.BeginArea(lowerPanel);
            GUILayout.Label("Lower Panel");
            GUILayout.EndArea();
        }
    }

     

•  但是，这两个面板分别设置为覆盖窗口的一半，但是如果我们希望它们可调整大小，则它们需要具有可变的高度。因此，我将添加一个大小比例变量；这样，当一个面板覆盖一定数量的窗口时，另一个面板可以覆盖其余部分。

  • using UnityEngine;
    using UnityEditor;
     
    public class ResizablePanels : EditorWindow
    {
        private Rect upperPanel;
        private Rect lowerPanel;
     
        private float sizeRatio = 0.5f;
     
        [MenuItem("Window/Resizable Panels")]
        private static void OpenWindow()
        {
            ResizablePanels window = GetWindow();
            window.titleContent = new GUIContent("Resizable Panels");
        }
     
        private void OnGUI()
        {
            DrawUpperPanel();
            DrawLowerPanel();
        }
     
        private void DrawUpperPanel()
        {
            upperPanel = new Rect(0, 0, position.width, position.height * sizeRatio);
     
            GUILayout.BeginArea(upperPanel);
            GUILayout.Label("Upper Panel");
            GUILayout.EndArea();
        }
     
        private void DrawLowerPanel()
        {
            lowerPanel = new Rect(0, (position.height * sizeRatio), position.width, position.height * (1 - sizeRatio));
     
            GUILayout.BeginArea(lowerPanel);
            GUILayout.Label("Lower Panel");
            GUILayout.EndArea();
        }
    }

     

• 接下来，我们使用EditorGUIUtility.AddCursorRect（Rect rect，MouseCursor光标） 方法来完成用鼠标调节区域大小的功能

• using UnityEngine;
  using UnityEditor;
   
  public class ResizablePanels : EditorWindow
  {
      private Rect upperPanel;
      private Rect lowerPanel;
      private Rect resizer;
   
      private float sizeRatio = 0.5f;
      private bool isResizing;
   
      private GUIStyle resizerStyle;
   
      [MenuItem("Window/Resizable Panels")]
      private static void OpenWindow()
      {
          ResizablePanels window = GetWindow();
          window.titleContent = new GUIContent("Resizable Panels");
      }
   
      private void OnEnable()
      {
          resizerStyle = new GUIStyle();
          resizerStyle.normal.background = EditorGUIUtility.Load("icons/d_AvatarBlendBackground.png") as Texture2D;
      }
   
      private void OnGUI()
      {
          DrawUpperPanel();
          DrawLowerPanel();
          DrawResizer();
      }
   
      private void DrawUpperPanel()
      {
          upperPanel = new Rect(0, 0, position.width, position.height * sizeRatio);
   
          GUILayout.BeginArea(upperPanel);
          GUILayout.Label("Upper Panel");
          GUILayout.EndArea();
      }
   
      private void DrawLowerPanel()
      {
          lowerPanel = new Rect(0, (position.height * sizeRatio) + 5, position.width, position.height * (1 - sizeRatio) - 5);
   
          GUILayout.BeginArea(lowerPanel);
          GUILayout.Label("Lower Panel");
          GUILayout.EndArea();
      }
   
      private void DrawResizer()
      {
          resizer = new Rect(0, (position.height * sizeRatio) - 5f, position.width, 10f); // 这里是确定位置的
   
          GUILayout.BeginArea(new Rect(resizer.position + (Vector2.up * 5f), new Vector2(position.width, 2)), resizerStyle); // 这里是绘制调节的横条，宽度为整个面板的宽度，高度为2
          GUILayout.EndArea();
   
          EditorGUIUtility.AddCursorRect(resizer, MouseCursor.ResizeVertical);
      }
  }

   

•  最后，我们给鼠标来配置事件

  • using UnityEngine;
    using UnityEditor;
     
    public class ResizablePanels : EditorWindow
    {
        private Rect upperPanel;
        private Rect lowerPanel;
        private Rect resizer;
     
        private float sizeRatio = 0.5f;
        private bool isResizing;
     
        private GUIStyle resizerStyle;
     
        [MenuItem("Window/Resizable Panels")]
        private static void OpenWindow()
        {
            ResizablePanels window = GetWindow();
            window.titleContent = new GUIContent("Resizable Panels");
        }
     
        private void OnEnable()
        {
            resizerStyle = new GUIStyle();
            resizerStyle.normal.background = EditorGUIUtility.Load("icons/d_AvatarBlendBackground.png") as Texture2D;
        }
     
        private void OnGUI()
        {
            DrawUpperPanel();
            DrawLowerPanel();
            DrawResizer();
     
            ProcessEvents(Event.current);
     
            if (GUI.changed) Repaint();
        }
     
        private void DrawUpperPanel()
        {
            upperPanel = new Rect(0, 0, position.width, position.height * sizeRatio);
     
            GUILayout.BeginArea(upperPanel);
            GUILayout.Label("Upper Panel");
            GUILayout.EndArea();
        }
     
        private void DrawLowerPanel()
        {
            lowerPanel = new Rect(0, (position.height * sizeRatio) + 5, position.width, position.height * (1 - sizeRatio) - 5);
     
            GUILayout.BeginArea(lowerPanel);
            GUILayout.Label("Lower Panel");
            GUILayout.EndArea();
        }
     
        private void DrawResizer()
        {
            resizer = new Rect(0, (position.height * sizeRatio) - 5f, position.width, 10f);
     
            GUILayout.BeginArea(new Rect(resizer.position + (Vector2.up * 5f), new Vector2(position.width, 2)), resizerStyle);
            GUILayout.EndArea();
     
            EditorGUIUtility.AddCursorRect(resizer, MouseCursor.ResizeVertical);
        }
     
        private void ProcessEvents(Event e)
        {
            switch (e.type)
            {
                case EventType.MouseDown:
                    if (e.button == 0 && resizer.Contains(e.mousePosition)) // 鼠标左键按下且鼠标在调节条的位置处
                    {
                        isResizing = true; // 调节为true
                    }
                    break;
     
                case EventType.MouseUp:
                    isResizing = false;
                    break;
            }
     
            Resize(e);
        }
     
        private void Resize(Event e)
        {
            if (isResizing) // 如果调节为true
            {
                sizeRatio = e.mousePosition.y / position.height; // 开始计算比例
                Repaint();
            }
        }
    }

      

本文参考（https://gram.gs/gramlog/creating-editor-windows-in-unity/）

效果如下