Revit menu (UI) custom items: ribbon tabs, panels, buttons, textBoxes, comboBoxes

using System.IO;
using System.Reflection;
using System.Windows.Media.Imaging;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

namespace RevitMastery.Revit
{
	[Transaction(TransactionMode.Manual)]
	[Regeneration(RegenerationOption.Manual)]
	public class RevitMasteryApplication : IExternalApplication
	{
		public static int SelectedElementsNumber { get; private set; } = 1;
		public static Type SelectedElementType { get; private set; } = typeof(Wall);


		public Result OnStartup(UIControlledApplication application)
		{
			var ribbonTabName = "Revit Mastery";
			application.CreateRibbonTab(ribbonTabName);
			var panel = application.CreateRibbonPanel(ribbonTabName, "Revit Mastery Panel");

			var assemblyPath = Assembly.GetExecutingAssembly().Location; //localization of the currently executing assembly. Don't worry, copy ;)
			var assemblyDirectory = Path.GetDirectoryName(assemblyPath);

			// Button
			var buttonData = new PushButtonData(
				typeof(ShowElementsDataCommand).FullName,
				"Show elements data", 
				assemblyPath,
				typeof(ShowElementsDataCommand).FullName);
			
			var button = panel.AddItem(buttonData) as PushButton;
			button.ToolTip = "Click to show data of elements of inserted number and selected type.";

			var buttonContextualHelp = new ContextualHelp(ContextualHelpType.Url, "https://revitmastery.com/revit-plugin-types/");
			button.SetContextualHelp(buttonContextualHelp);

			var buttonImageUri = new Uri(Path.Combine(assemblyDirectory, "Resources", "Images", "description_32.png")); // Image size: 32x32 px	
			var buttonImage = new BitmapImage(buttonImageUri);
			button.LargeImage = buttonImage;


			// TextBox
			var textBoxData = new TextBoxData("nameTextBox");
			var textBox = panel.AddItem(textBoxData) as TextBox;

			textBox.PromptText = "Number of elements";
			textBox.ToolTip = "Enter the number of elements to show and click Enter.";

			var textBoxImageUri = new Uri(Path.Combine(assemblyDirectory, "Resources", "Images", "numbers_16.png")); // Image size: 16x16 px	
			var textBoxImage = new BitmapImage(textBoxImageUri);
			textBox.Image = textBoxImage;
			
			textBox.EnterPressed += TextBox_EnterPressed; // event
			

			// ComboBox
			var comboBoxData = new ComboBoxData("elementTypeComboBox");
			var comboBox = panel.AddItem(comboBoxData) as ComboBox;
			comboBox.ToolTip = "Select elements type.";			

			var comboBoxImageUri = new Uri(Path.Combine(assemblyDirectory, "Resources", "Images", "list_16.png")); // Image size: 16x16 px	
			var comboBoxImage = new BitmapImage(comboBoxImageUri);
			comboBox.Image = comboBoxImage;

			var comboBoxMemberData_wall = new ComboBoxMemberData("elementTypeComboBox_wall", "Walls");
			var comboBoxMember_wall = comboBox.AddItem(comboBoxMemberData_wall);

			var comboBoxMemberData_floor = new ComboBoxMemberData("elementTypeComboBox_floor", "Floors");
			var comboBoxMember_floor = comboBox.AddItem(comboBoxMemberData_floor);

			comboBox.CurrentChanged += ComboBox_CurrentChanged; //event 
			

			return Result.Succeeded;
		}			

		private void TextBox_EnterPressed(object? sender, Autodesk.Revit.UI.Events.TextBoxEnterPressedEventArgs e)
		{
			var textBox = sender as TextBox;
			var textBoxValue = textBox.Value.ToString();

			var isTextBoxValueInt = int.TryParse(textBoxValue, out var intTextBoxValue);

			if(isTextBoxValueInt)
			{
				SelectedElementsNumber = intTextBoxValue; // assigning to a static property
				TaskDialog.Show("TextBox", $"Current texBox value is: {textBoxValue}");
			}
			else
			{
				TaskDialog.Show("TextBox", $"Insert an integer!");
			}			
		}

		private void ComboBox_CurrentChanged(object? sender, Autodesk.Revit.UI.Events.ComboBoxCurrentChangedEventArgs e)
		{
			var comboBox = sender as ComboBox;
			var comboBoxValue = comboBox.Current.ItemText;

			var elementType =  comboBoxValue == "Walls" ? typeof(Wall) : typeof(Floor);
			SelectedElementType = elementType; // assigning to a static property

			TaskDialog.Show("ComboBox", $"Current comboBox value is: {comboBoxValue}");
		}


		public Result OnShutdown(UIControlledApplication application)
		{
			return Result.Succeeded;
		}
	}
}

using Autodesk.Revit.Attributes;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB;

namespace RevitMastery.Revit
{
	[Transaction(TransactionMode.Manual)]
	[Regeneration(RegenerationOption.Manual)]
	public class ShowElementsDataCommand : IExternalCommand
	{
		public Result Execute(ExternalCommandData commandData, ref string message,
		ElementSet elements)
		{
			UIApplication uiApp = commandData.Application;
			Document doc = uiApp.ActiveUIDocument.Document;

			var elementsNumber = RevitMasteryApplication.SelectedElementsNumber;
			var elementsType = RevitMasteryApplication.SelectedElementType;

			var collector = new FilteredElementCollector(doc).WhereElementIsNotElementType().OfClass(elementsType);
			var collectedElements = collector.ToElements();

			var numberToShow = Math.Min(collectedElements.Count, elementsNumber);

			var elementsMessage = "Elements names: \n";
			for ( var i = 0; i<numberToShow; i++)
			{
				var element = collectedElements[i];
				var elementName = element.Name;
				elementsMessage += $"{i+1}. {elementName}\n";
			}			
			
			TaskDialog.Show("Show elements data", elementsMessage);

			return Result.Succeeded;
		}
	}
}