Unity editor expansion - the framework and context of unity imgui

Little knowledge

• Unity Based on IMGUI The design idea of ui Frame and use it to make UnityEditor
• In the early Unity Users of ui Also mostly used IMGUI Realization
• IMGUI Performance ratio ngui and ugui low , No one should use the new project now ngui 了
• Now? Unity A new ui programme , Integrate the past unity Officially supported ui
• I guess I'll leave the world ui The framework update is not far away , Another wave of technological progress

Unity IMGUI Framework

• stay Monobehaviour perhaps Window Defined in subclasses OnGUI Method , stay OnGUI Method can be used Unity Of api establish ui
• make carbon copies Editor Class OnInspectorGUI The method has a similar effect , This is often used to customize a Mono Script editor

Core class ： create a window 、 Control , Make a layout , Modify the style

• EditorWindow, The custom window must be EditorWindow Subclasses of , Use GetWindow establish
• GUI, There is no automatic layout , You can create controls , You can set to get GUI The state of
• GUILayout, There is automatic layout , You can create controls
• GUILayoutUtility, Yes GUILayout expand
• EditorGUI, More functions GUI
• EditorGUILayout, More functions GUILayout
• EditorGUIUtility, Yes GUILayout Development of
• Handles, Painting in the scene 3D ui
• What does auto layout mean
  • You can specify scalable size information to make the control layout automatically
  • Use GUILayout Method creation under GUILayoutOption To set layout properties
• Create in the editor GUISkin, When you create a control, you can change the style by passing it to the control

example

• More examples can be found in the resources below unity Official documents found

using UnityEditor;
using UnityEngine;

namespace DC.DCIMGUIBox
{
    public class LayoutAndAreaWindow_01 : EditorWindow
    {
        [MenuItem("DC/IMGUI/LayoutAndAreaWindow_01")]
        public static void Open()
        {
            var window = GetWindow<LayoutAndAreaWindow_01>();
            window.minSize = new Vector2(800, 600);
        }

        public void OnGUI()
        {
            GUILayout.BeginArea(new Rect(0, 0, 200, 200));
            EditorGUI.DrawRect(new Rect(0, 0, 100, 100), Color.blue);
            if (Event.current.type == EventType.MouseDown)
            {
                Debug.Log("box a" + Event.current.mousePosition);
            }

            GUILayout.EndArea();


            GUILayout.BeginArea(new Rect(210, 0, 200, 200));
            EditorGUI.DrawRect(new Rect(0, 0, 100, 100), Color.red);
            if (Event.current.type == EventType.MouseDown)
            {
                Debug.Log("box b" + Event.current.mousePosition);
            }

            GUILayout.EndArea();
        }
    }
}

Reference material

• https://docs.unity3d.com/Manual/GUIScriptingGuide.html