UIProgressBar.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria.UI;
 
namespace Terraria.GameContent.UI.Elements;
 
public class UIProgressBar : UIElement
{
    private class UIInnerProgressBar : UIElement
    {
        protected override void DrawSelf(SpriteBatch spriteBatch)
        {
            CalculatedStyle dimensions = GetDimensions();
            spriteBatch.Draw(TextureAssets.MagicPixel.Value, new Vector2(dimensions.X, dimensions.Y), null, Color.Blue, 0f, Vector2.Zero, new Vector2(dimensions.Width, dimensions.Height / 1000f), SpriteEffects.None, 0f);
        }
    }
 
    private UIInnerProgressBar _progressBar = new UIInnerProgressBar();
 
    private float _visualProgress;
 
    private float _targetProgress;
 
    public UIProgressBar()
    {
        _progressBar.Height.Precent = 1f;
        _progressBar.Recalculate();
        Append(_progressBar);
    }
 
    public void SetProgress(float value)
    {
        _targetProgress = value;
        if (value < _visualProgress)
        {
            _visualProgress = value;
        }
    }
 
    protected override void DrawSelf(SpriteBatch spriteBatch)
    {
        _visualProgress = _visualProgress * 0.95f + 0.05f * _targetProgress;
        _progressBar.Width.Precent = _visualProgress;
        _progressBar.Recalculate();
    }
}