UILinkPage.cs

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using System;
using System.Collections.Generic;
 
namespace Terraria.UI.Gamepad;
 
public class UILinkPage
{
    public int ID;
 
    public int PageOnLeft = -1;
 
    public int PageOnRight = -1;
 
    public int DefaultPoint;
 
    public int CurrentPoint;
 
    public Dictionary<int, UILinkPoint> LinkMap = new Dictionary<int, UILinkPoint>();
 
    public event Action<int, int> ReachEndEvent;
 
    public event Action TravelEvent;
 
    public event Action LeaveEvent;
 
    public event Action EnterEvent;
 
    public event Action UpdateEvent;
 
    public event Func<bool> IsValidEvent;
 
    public event Func<bool> CanEnterEvent;
 
    public event Action<int> OnPageMoveAttempt;
 
    public event Func<string> OnSpecialInteracts;
 
    public UILinkPage()
    {
    }
 
    public UILinkPage(int id)
    {
        ID = id;
    }
 
    public void Update()
    {
        if (this.UpdateEvent != null)
        {
            this.UpdateEvent();
        }
    }
 
    public void Leave()
    {
        if (this.LeaveEvent != null)
        {
            this.LeaveEvent();
        }
    }
 
    public void Enter()
    {
        if (this.EnterEvent != null)
        {
            this.EnterEvent();
        }
    }
 
    public bool IsValid()
    {
        if (this.IsValidEvent != null)
        {
            return this.IsValidEvent();
        }
        return true;
    }
 
    public bool CanEnter()
    {
        if (this.CanEnterEvent != null)
        {
            return this.CanEnterEvent();
        }
        return true;
    }
 
    public void TravelUp()
    {
        Travel(LinkMap[CurrentPoint].Up);
    }
 
    public void TravelDown()
    {
        Travel(LinkMap[CurrentPoint].Down);
    }
 
    public void TravelLeft()
    {
        Travel(LinkMap[CurrentPoint].Left);
    }
 
    public void TravelRight()
    {
        Travel(LinkMap[CurrentPoint].Right);
    }
 
    public void SwapPageLeft()
    {
        if (this.OnPageMoveAttempt != null)
        {
            this.OnPageMoveAttempt(-1);
        }
        UILinkPointNavigator.ChangePage(PageOnLeft);
    }
 
    public void SwapPageRight()
    {
        if (this.OnPageMoveAttempt != null)
        {
            this.OnPageMoveAttempt(1);
        }
        UILinkPointNavigator.ChangePage(PageOnRight);
    }
 
    private void Travel(int next)
    {
        if (next < 0)
        {
            if (this.ReachEndEvent != null)
            {
                this.ReachEndEvent(CurrentPoint, next);
                if (this.TravelEvent != null)
                {
                    this.TravelEvent();
                }
            }
        }
        else
        {
            UILinkPointNavigator.ChangePoint(next);
            if (this.TravelEvent != null)
            {
                this.TravelEvent();
            }
        }
    }
 
    public string SpecialInteractions()
    {
        if (this.OnSpecialInteracts != null)
        {
            return this.OnSpecialInteracts();
        }
        return string.Empty;
    }
}