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Showing content from https://docs.unity3d.com/Manual/sprite/../../ScriptReference/UIElements.GenericDropdownMenu.html below:

Unity - Scripting API: GenericDropdownMenu

GenericDropdownMenu

class in UnityEngine.UIElements

Implemented in:UnityEngine.UIElementsModule

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Description

GenericDropdownMenu allows you to display contextual menus with default textual options or any VisualElement.

The GenericDropdownMenu is a generic implementation of a dropdown menu that you can use in both Editor UI and runtime UI.

The following example creates a dropdown menu with three items. It displays the menu when the user clicks the button. The example also demonstrates how to set the width of the dropdown menu with the DropDown method.

using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;public class MenuExample : EditorWindow
{
    [MenuItem("Window/UI Toolkit/MenuExample")]
    public static void ShowExample()
    {
        MenuExample wnd = GetWindow<MenuExample>();
        wnd.titleContent = new GUIContent("MenuExample");
    }
    public void CreateGUI()
    {
        VisualElement root = rootVisualElement;
        // Create a button.
        var button = new Button();
        button.text = "Button";
        button.style.width = 70;
        // Create a dropdown menu with three items.
        var menu = new GenericDropdownMenu();
        menu.AddItem("Item 1", false, a => { Debug.Log("Item 1 was selected"); }, null);
        menu.AddItem("Item 2", false, a => { Debug.Log("Item 2 was selected"); }, null);
        menu.AddItem("Item 3 has a very very long label", false, a => { Debug.Log("Item 3 was selected"); }, null);
        // When the button is clicked, the dropdown menu is displayed aligned with the button's world boundaries.
        button.clicked += () =>
        {
            // The third and the fourth parameters of the DropDown set the width of the dropdown menu.
            // This sets the width of the dropdown menu to the width of the container.
            menu.DropDown(button.worldBound, button, false);
            // This sets the width of the dropdown menu to the width of the button.
            // menu.DropDown(button.worldBound, button, true, false);
            // This sets the width of the dropdown menu to the width of the longest item.
            // menu.DropDown(button.worldBound, button, true, true);
        };
         root.Add(button);
    }
}

Properties Property Description contentContainer Returns the content container for the GenericDropdownMenu. Allows users to create their own dropdown menu if they don't want to use the default implementation. Constructors Constructor Description GenericDropdownMenu Initializes and returns an instance of GenericDropdownMenu. Public Methods Method Description AddDisabledItem Adds a disabled item to this menu using a default VisualElement. AddItem Adds an item to this menu using a default VisualElement. AddSeparator Adds a visual separator after the previously added items in this menu. DropDown Displays the menu at the specified position.

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