Create a pop-up window

Version: 2021.3+

This example demonstrates how to use UnityEditor.PopupWindow to create a pop-up window.

Example overview

This example creates a pop-up window that’s displayed through a button in a custom Editor window. The pop-up window has three toggles and closes when it isn’t in focus.

You can find the completed files that this example creates in this GitHub repository.

Prerequisites

This is an advanced example for developers familiar with the Unity Editor, UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Toolkit, and C# scripting. You are recommended to have a basic understanding of the following concepts:

Create a custom Editor window

Create a custom Editor window with a button. Define the button in a UI Document (UXML file) and style it in a USS file. Finally, define the button logic in a C# script so that when you click the button, the pop-up window displays.

Create a Unity project with any template.
Right-click in the Project window, and then select Create > UI Toolkit > Editor Window.
In the C# box of the UI Toolkit Editor Window Creator window, enter PopupExample.
Select Confirm. This creates three files: PopupExample.cs, PopupExample.uxml, and PopupExample.uss.

Replace PopupExample.uxml with the following content:

<ui:UXML xmlns:ui="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements" xsi="http://www.w3.org/2001/XMLSchema-instance" engine="UnityEngine.UIElements" editor="UnityEditor.UIElements" noNamespaceSchemaLocation="../../UIElementsSchema/UIElements.xsd" editor-extension-mode="True">
    <Style src="PopupExample.uss" />
    <ui:Button text="Popup Options" display-tooltip-when-elided="true" class="popup-button" />
</ui:UXML>

Replace PopupExample.cs with the following content:

using UnityEditor;
using UnityEngine.UIElements;
using PopupWindow = UnityEditor.PopupWindow;

public class PopupExample : EditorWindow
{
    // Add menu item
    [MenuItem("Example/Popup Example")]
    static void Init()
    {
        EditorWindow window = EditorWindow.CreateInstance<PopupExample>();
        window.Show();
    }

    private void CreateGUI()
    {
        var visualTreeAsset = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/Editor/PopupExample.uxml");
        visualTreeAsset.CloneTree(rootVisualElement);

        var button = rootVisualElement.Q<Button>();
        button.clicked += () => PopupWindow.Show(button.worldBound, new PopupContentExample());
    }
}

Replace PopupExample.uss with the following content:

    .popup-button {
        width: 200px;
    }

Create the pop-up window content

Create a UI Document (UXML file) to define the content in the pop-up window. Create a C# class to set the window size and to display the window.

In the Editor folder, create a UI Document named PopupWindowContent.uxml with the following content:

<ui:UXML xmlns:ui="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements" xsi="http://www.w3.org/2001/XMLSchema-instance" engine="UnityEngine.UIElements" editor="UnityEditor.UIElements" noNamespaceSchemaLocation="../../../UIElementsSchema/UIElements.xsd" editor-extension-mode="True">
    <ui:Toggle label="Toggle 1" name="Toggle1"/>
    <ui:Toggle label="Toggle 2" />
    <ui:Toggle label="Toggle 3" />
</ui:UXML>

In the Editor folder, create a C# file named PopupContentExample.cs with the following content:

using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

public class PopupContentExample : PopupWindowContent
{
    //Set the window size
    public override Vector2 GetWindowSize()
    {
        return new Vector2(200, 100);
    }

    public override void OnGUI(Rect rect)
    {
        // Intentionally left empty
    }

    public override void OnOpen()
    {
        Debug.Log("Popup opened: " + this);

        var visualTreeAsset = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>("Assets/Editor/PopupWindowContent.uxml");
        visualTreeAsset.CloneTree(editorWindow.rootVisualElement);
    }
        
    public override void OnClose()
    {
        Debug.Log("Popup closed: " + this);
    }
}

To test the popup window, from the menu, select Example > Popup Example > Popup Options.

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