Example Scroll View Code

cs

    /// <summary>
    /// Controller for the interact menu canvas.
    /// </summary>
    public class InteractMenuCanvasController : MonoBehaviour
    {
        // Constants
        private const string PanelName = "Panel";
        private const string ScrollViewName = "Scroll View";
        private const string ViewPortName = "Viewport";
        private const string Content = "Content";
        private const float FadeSpeed = 5f;
        private const float MenuToLauncherDistance = 5f;
        private const float PanelAlphaTarget = 0.5f;

        // Properties
        private GameObject canvas;
        private GameObject panel;
        private Image panelImage;
        private GameObject scrollView;
        private GameObject content;
        private Camera mainCamera;
        private BoxCollider2D canvasCollider;
        private bool alive;

        // Prefabs
        public GameObject buttonPrefab;

        void Awake()
        {
            canvas = gameObject;
            panel = findChildOrFail(PanelName);
            panelImage = panel.GetComponent<Image>();
            Helpers.VerifyNotNull(panel, "Panel image was null!");
            scrollView = findChildOrFail(string.Join("/", PanelName, ScrollViewName));
            content = findChildOrFail(string.Join("/", PanelName, ScrollViewName, ViewPortName, Content));
            mainCamera = Camera.main;
            alive = false;

            // Set Collider Size
            canvasCollider = gameObject.GetComponent<BoxCollider2D>();
            Helpers.VerifyNotNull(canvasCollider, "Canvas collider didn't exist");
            RectTransform canvasRect = transform.GetComponent<RectTransform>();
            Helpers.VerifyNotNull(canvasRect, "Canvas rect transform was null");
            canvasCollider.offset = new Vector2(0, 0);
            canvasCollider.size = canvasRect.rect.size;
        }

        void Update()
        {
            // Fade in and out
            Fading();
        }

        public void Setup(InteractMenuConfiguration config)
        {
            // Position the Canvas
            PositionCanvas(config);

            // Setup All UI Elements 
            SetupUIElements(config);

            // Set Fade In
            alive = true;
        }

        private void PositionCanvas(InteractMenuConfiguration config)
        {
            // Situate the canvas
            Vector3 bottomLeft = mainCamera.ViewportToWorldPoint(new Vector3(0, 0, 0));
            Vector3 bottomRight = mainCamera.ViewportToWorldPoint(new Vector3(1, 0, 0));
            Vector3 launcherPosition = config.launcherObject.transform.position;
            Vector3 menuPosition = transform.position;

            // Left or Right
            float leftDistX = Mathf.Abs(bottomLeft.x - launcherPosition.x);
            float rightDistX = Mathf.Abs(bottomRight.x - launcherPosition.x);
            if (leftDistX <= rightDistX)
            {
                // Right
                menuPosition.x = launcherPosition.x + MenuToLauncherDistance;
            }
            else if (leftDistX > rightDistX)
            {
                // Left
                menuPosition.x = launcherPosition.x - MenuToLauncherDistance;
            }

            // Vertical
            menuPosition.y = launcherPosition.y;

            // Set Position
            transform.position = menuPosition;
        }

        private void SetupUIElements(InteractMenuConfiguration config)
        {
            GameObject button = Instantiate(buttonPrefab);
            RectTransform buttonTransform = (RectTransform)button.transform;

            // Set Name
            button.name = "Use Button";

            // Set Parent
            button.transform.SetParent(content.transform);

            // Set anchors
            buttonTransform.anchorMin = new Vector2(0, 0);
            buttonTransform.anchorMax = new Vector2(1, 1);
            buttonTransform.pivot = new Vector2(0.5f, 0.5f);

            // Position the button
            button.transform.localScale = new Vector3(1, 1, 1);
            button.transform.position = new Vector3(0, 0, 0);

            Button buttonScript = button.GetComponent<Button>();
            GameObject buttonText = buttonScript.transform.Find("Text")?.gameObject;
            //TextMeshProUGUI buttonTextScript = buttonText.GetComponent<TextMeshProUGUI>();
            //buttonTextScript.text = "Shit";
        }

        public void TearDown()
        {
            // Set Fade Out
            alive = false;
        }

        private void Fading()
        {
            if (alive)
            {
                if (panelImage.color.a < PanelAlphaTarget)
                {
                    Color color = panelImage.color;
                    color.a += FadeSpeed * Time.deltaTime;
                    panelImage.color = color;
                }
            }
            else
            {
                if (panelImage.color.a > 0)
                {
                    Color color = panelImage.color;
                    color.a -= FadeSpeed * Time.deltaTime;
                    panelImage.color = color;
                }
                else
                {
                    Destroy(gameObject);
                }
            }
        }

        GameObject findChildOrFail(string name)
        {
            Transform toFindTransform = gameObject.transform.Find(name);
            Helpers.VerifyNotNull(toFindTransform?.gameObject, "Could not find: " + name);
            return toFindTransform.gameObject;
        }
    }

    /// <summary>
    /// InteractMenuConfiguration contains configuration to setup the interact menu.
    /// </summary>
    public class InteractMenuConfiguration
    {
        public GameObject launcherObject { get; }
        public InteractMenuConfiguration(GameObject launcherObject)
        {
            this.launcherObject = launcherObject;
        }
    }