UITextBox.cs

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using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria.UI;
 
namespace Terraria.GameContent.UI.Elements;
 
internal class UITextBox : UITextPanel<string>
{
    private int _cursor;
 
    private int _frameCount;
 
    private int _maxLength = 20;
 
    public bool ShowInputTicker = true;
 
    public bool HideSelf;
 
    public UITextBox(string text, float textScale = 1f, bool large = false)
        : base(text, textScale, large)
    {
    }
 
    public void Write(string text)
    {
        SetText(base.Text.Insert(_cursor, text));
        _cursor += text.Length;
    }
 
    public override void SetText(string text, float textScale, bool large)
    {
        if (text == null)
        {
            text = "";
        }
        if (text.Length > _maxLength)
        {
            text = text.Substring(0, _maxLength);
        }
        base.SetText(text, textScale, large);
        _cursor = Math.Min(base.Text.Length, _cursor);
    }
 
    public void SetTextMaxLength(int maxLength)
    {
        _maxLength = maxLength;
    }
 
    public void Backspace()
    {
        if (_cursor != 0)
        {
            SetText(base.Text.Substring(0, base.Text.Length - 1));
        }
    }
 
    public void CursorLeft()
    {
        if (_cursor != 0)
        {
            _cursor--;
        }
    }
 
    public void CursorRight()
    {
        if (_cursor < base.Text.Length)
        {
            _cursor++;
        }
    }
 
    protected override void DrawSelf(SpriteBatch spriteBatch)
    {
        if (HideSelf)
        {
            return;
        }
        _cursor = base.Text.Length;
        base.DrawSelf(spriteBatch);
        _frameCount++;
        if ((_frameCount %= 40) <= 20 && ShowInputTicker)
        {
            CalculatedStyle innerDimensions = GetInnerDimensions();
            Vector2 pos = innerDimensions.Position();
            Vector2 vector = new Vector2((base.IsLarge ? FontAssets.DeathText.Value : FontAssets.MouseText.Value).MeasureString(base.Text.Substring(0, _cursor)).X, base.IsLarge ? 32f : 16f) * base.TextScale;
            if (base.IsLarge)
            {
                pos.Y -= 8f * base.TextScale;
            }
            else
            {
                pos.Y -= 2f * base.TextScale;
            }
            pos.X += (innerDimensions.Width - base.TextSize.X) * TextHAlign + vector.X - (base.IsLarge ? 8f : 4f) * base.TextScale + 6f;
            if (base.IsLarge)
            {
                Utils.DrawBorderStringBig(spriteBatch, "|", pos, base.TextColor, base.TextScale);
            }
            else
            {
                Utils.DrawBorderString(spriteBatch, "|", pos, base.TextColor, base.TextScale);
            }
        }
    }
}