UI Toolkitサンプル:MouseDown・MouseUpショートコード

UIToolkit_MouseDownUpTest.cs

using UnityEngine;
using UnityEngine.UIElements;

// 解説Qiita記事 : https://qiita.com/ohbashunsuke/items/ae1da96e582aef734eee
[RequireComponent(typeof(UIDocument))]
public class UIToolkit_MouseDownUpTest : MonoBehaviour
{
    void OnEnable()
    {
        var document = GetComponent<UIDocument>();
        var visualTree = document.rootVisualElement;
        var container = visualTree.Q("container");
        container.RegisterCallback<PointerDownEvent>(OnPointerDown);
        container.RegisterCallback<PointerUpEvent>(OnPointerUp);
    }

    private void OnPointerDown(PointerDownEvent evt)
    {
        var ve = (VisualElement) evt.target;
        ve.style.backgroundColor = Color.red;
    }

    private void OnPointerUp(PointerUpEvent evt)
    {
        var ve = (VisualElement) evt.target;
        ve.style.backgroundColor = Color.yellow;
    }
}

UIToolkit_MouseDownUpTest.uxml

<ui:UXML xmlns:ui="UnityEngine.UIElements" editor-extension-mode="False">
    <Style src="TouchTest.uss" />
    <ui:VisualElement name="container" style="height: 100%; width: 100%; background-color: rgba(255, 255, 0, 255);" />
</ui:UXML>