micromissiles-unity/Assets/Scripts/UI/UISelectableEntry.cs

using System.Collections.Generic;
using System;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEngine.EventSystems;

public class UISelectableEntry : EventTrigger {
    private List<UISelectableEntry> children;
    private List<string> textContent;

    private UIDialog parentDialog;

    private RectTransform rectTransform;

    private CanvasRenderer canvasRenderer;

    private Image image;

    private TextMeshProUGUI textHandle;

    private bool isSelectable = true;

    private static Color baseColor = new Color32(31, 31, 45, 140);

    private Action<object> OnClickCallback;
    private  object callbackArgument;


    public void Awake() {
        rectTransform = gameObject.AddComponent<RectTransform>();
        textHandle = Instantiate(Resources.Load<GameObject>("Prefabs/EmptyObject"), rectTransform).AddComponent<TextMeshProUGUI>();
        textHandle.gameObject.name = "UISelectableEntry::Text";
        textHandle.fontSize = 12;
        textHandle.font = UIManager.Instance.Font;
        textHandle.alignment = TextAlignmentOptions.MidlineLeft;
        textHandle.GetComponent<RectTransform>().anchorMin = new Vector2(0, 0.5f);
        textHandle.GetComponent<RectTransform>().anchorMax = new Vector2(1, 0.5f);
        textHandle.GetComponent<RectTransform>().pivot = new Vector2(0.5f, 0.5f);
        textHandle.GetComponent<RectTransform>().anchoredPosition = new Vector2(0, 0);
        textHandle.GetComponent<RectTransform>().sizeDelta = new Vector2(0, 20);

        image = gameObject.AddComponent<Image>();
        image.type = Image.Type.Sliced;
        image.color = baseColor;
    }

    public void SetClickCallback(Action<object> callback, object argument)
    {
        OnClickCallback = callback;
        callbackArgument = argument;
    }

    public override void OnPointerEnter(PointerEventData eventData)
    {
        if(isSelectable)
            image.color = baseColor + new Color32(20, 20, 20, 40);
        base.OnPointerEnter(eventData);
    }

    public override void OnPointerDown(PointerEventData eventData)
    {
        if(isSelectable && OnClickCallback != null)
        {
            OnClickCallback(callbackArgument);
            image.color = baseColor + new Color32(40, 40, 40, 40);

        }
        base.OnPointerClick(eventData);
    }

    public override void OnPointerExit(PointerEventData eventData)
    {
        if(isSelectable)
            image.color = baseColor;
        base.OnPointerExit(eventData);
    }

    public void SetIsSelectable(bool isSelectable) {
        if(isSelectable)
            image.enabled = true;
        else
            image.enabled = false;
        this.isSelectable = isSelectable;
    }

    public bool GetIsSelectable() {
        return isSelectable;
    }

    public void AddChildEntry(UISelectableEntry child) {
        if (children == null) {
            children = new List<UISelectableEntry>();
        }
        children.Add(child);
    }

    public void SetParent(UIDialog parentDialog) {
        this.parentDialog = parentDialog;
    }

    public void SetChildEntries(List<UISelectableEntry> children) {
        this.children = children;
    }

    // Get the children of this entry
    public List<UISelectableEntry> GetChildEntries() {
        return children;
    }

    public void SetTextContent(List<string> textContent) {
        this.textContent = textContent;
        textHandle.text = string.Join("\t", textContent);
    }

    public RectTransform GetTextTransform() {
        return textHandle.GetComponent<RectTransform>();
    }
}