unity-editor-imgui-design

Unity Editor IMGUI Design Skill

WARNING: IMGUI is for Unity Editor extensions ONLY. For game UI, use unity-game-ugui-design or unity-game-ui-toolkit-design.

IMGUI vs Game UI

Aspect	IMGUI (Editor)	uGUI / UI Toolkit (Game)
Purpose	Editor tools, inspectors	In-game UI, HUD
Build inclusion	Editor only	Included in builds
Rendering	Immediate mode	Retained mode
Performance	OK for editor	Optimized for runtime
Styling	Limited (GUISkin)	Rich (USS, materials)

---

Quick Start

Create EditorWindow

// Create editor window script
mcp__unity-mcp-server__create_class({
  path: "Assets/Editor/MyToolWindow.cs",
  className: "MyToolWindow",
  namespace: "MyProject.Editor",
  baseType: "EditorWindow",
  usings: "UnityEditor"
})

// Add window content
mcp__unity-mcp-server__edit_structured({
  path: "Assets/Editor/MyToolWindow.cs",
  symbolName: "MyToolWindow",
  operation: "insert_after",
  newText: `
    [MenuItem("Tools/My Tool Window")]
    public static void ShowWindow()
    {
        GetWindow<MyToolWindow>("My Tool");
    }

    private void OnGUI()
    {
        GUILayout.Label("My Tool", EditorStyles.boldLabel);

        if (GUILayout.Button("Do Something"))
        {
            Debug.Log("Button clicked!");
        }
    }
`
})

Create Custom Inspector

// Create custom inspector script
mcp__unity-mcp-server__create_class({
  path: "Assets/Editor/MyComponentEditor.cs",
  className: "MyComponentEditor",
  namespace: "MyProject.Editor",
  baseType: "Editor",
  usings: "UnityEditor"
})

// Add CustomEditor attribute and OnInspectorGUI
mcp__unity-mcp-server__edit_structured({
  path: "Assets/Editor/MyComponentEditor.cs",
  symbolName: "MyComponentEditor",
  operation: "insert_before",
  newText: "[CustomEditor(typeof(MyComponent))]\n"
})

mcp__unity-mcp-server__edit_structured({
  path: "Assets/Editor/MyComponentEditor.cs",
  symbolName: "MyComponentEditor",
  operation: "insert_after",
  newText: `
    public override void OnInspectorGUI()
    {
        serializedObject.Update();

        EditorGUILayout.PropertyField(serializedObject.FindProperty("myField"));

        if (GUILayout.Button("Custom Button"))
        {
            ((MyComponent)target).DoSomething();
        }

        serializedObject.ApplyModifiedProperties();
    }
`
})