sceneWindow.cs

using UnityEngine;

using UnityEditor;
using UnityEditor.SceneManagement;

using System.Collections.Generic;
using System.IO;

// Scene selection

class sceneWindow : EditorWindow {

	[MenuItem ("Window/Scenes")]
	public static void ShowWindow () {
		
		EditorWindow.GetWindow(typeof(sceneWindow), false, "Scenes");
		
	}
	
	int selected; int changedSelected;
	List<string> scenes = new List<string>();

	void OnGUI () {
		
		EditorGUILayout.Space();
		
		scenes.Clear();
		
		string[] dropOptions = new string[EditorBuildSettings.scenes.Length];
		
		for(int i = 0; i < EditorBuildSettings.scenes.Length; i++){
			
			EditorBuildSettingsScene scene = EditorBuildSettings.scenes[i];
			
			string sceneName = Path.GetFileNameWithoutExtension(scene.path);
			
			scenes.Add(sceneName);
			
			dropOptions[i] = scenes[i];
			
			if(scene.path == EditorSceneManager.GetActiveScene().path){
				
				selected = changedSelected = i;
				
			}
			
		}
		
		// Selection
		
		changedSelected = EditorGUILayout.Popup(selected, dropOptions);
		
		if(selected != changedSelected){
			
			selected = changedSelected;
			
			EditorSceneManager.SaveCurrentModifiedScenesIfUserWantsTo();
			EditorSceneManager.OpenScene(EditorBuildSettings.scenes[changedSelected].path);
			
		}
		
		EditorGUILayout.Space();
		
		EditorGUILayout.LabelField("Scenes", EditorStyles.boldLabel);
		
		for(int i = 0; i < scenes.Count; i++){
			
			if(GUILayout.Button(scenes[i], GUILayout.Height(20))){
				
				selected = changedSelected = i;
				
				EditorSceneManager.SaveCurrentModifiedScenesIfUserWantsTo();
				EditorSceneManager.OpenScene(EditorBuildSettings.scenes[i].path);
				
			}
			
			dropOptions[i] = scenes[i];
			
		}
		
	}
	
}