GuiTextPanel.cs

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using Microsoft.Xna.Framework.Graphics;
using Terraria;
using Terraria.GameContent.UI.Elements;

namespace Loot.UI.Common.Controls.Panel
{
    internal class GuiTextPanel : GuiPanel
    {
        private const string DEFAULT_TEXT = "...";
        private string _hoverText;
        private UIText _text;

        public override void OnInitialize()
        {
            base.OnInitialize();
            _text = new UIText(DEFAULT_TEXT, 0.75f);
            Frame.Append(_text);
        }

        public void SetHoverText(string line)
        {
            _hoverText = line;
        }

        public void UpdateText(string line)
        {
            if (_text == null) return;
            _text.SetText(line);
            _text.Left.Pixels = GuiTab.PADDING;
            _text.Top.Set(Main.fontMouseText.MeasureString(line).Y * 0.375f, 0);
        }

        public void ResetText()
        {
            UpdateText(DEFAULT_TEXT);
        }

        protected override void DrawSelf(SpriteBatch spriteBatch)
        {
            base.DrawSelf(spriteBatch);

            if (IsMouseHovering)
            {
                Main.hoverItemName = _hoverText ?? _text.Text;
            }
        }
    }
}