osu-lazer/osu.Game/Graphics/UserInterface/OsuPasswordTextBox.cs

// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Graphics.Transforms;
using OpenTK;
using OpenTK.Graphics;

namespace osu.Game.Graphics.UserInterface
{
    public class OsuPasswordTextBox : OsuTextBox
    {
        protected override Drawable GetDrawableCharacter(char c) => new PasswordMaskChar(CalculatedTextSize);

        public class PasswordMaskChar : Container
        {
            private CircularContainer circle;

            public PasswordMaskChar(float size)
            {
                Size = new Vector2(size / 2, size);
                Children = new[]
                {
                    circle = new CircularContainer
                    {
                        Anchor = Anchor.Centre,
                        Alpha = 0,
                        RelativeSizeAxes = Axes.Both,
                        Size = new Vector2(0.8f, 0),
                        Children = new[]
                        {
                            new Box
                            {
                                Colour = Color4.White,
                                RelativeSizeAxes = Axes.Both,
                            }
                        },
                    }
                };
            }

            protected override void LoadComplete()
            {
                base.LoadComplete();
                circle.FadeIn(500, EasingTypes.OutQuint);
                circle.ResizeTo(new Vector2(0.8f), 500, EasingTypes.OutQuint);
            }
        }
    }
}