osu/osu.Game/Overlays/Settings/SettingsTextBox.cs

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using osu.Framework.Allocation;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Input.Events;
using osu.Game.Graphics;
using osu.Game.Graphics.UserInterface;
using osuTK.Graphics;

namespace osu.Game.Overlays.Settings
{
    public class SettingsTextBox : SettingsItem<string>
    {
        protected override Drawable CreateControl() => new TextBox
        {
            Margin = new MarginPadding { Top = 5 },
            RelativeSizeAxes = Axes.X,
            CommitOnFocusLost = true,
        };

        public class TextBox : OsuTextBox
        {
            private const float border_thickness = 3;

            private Color4 borderColourFocused;
            private Color4 borderColourUnfocused;

            [BackgroundDependencyLoader]
            private void load(OsuColour colour)
            {
                borderColourUnfocused = colour.Gray4.Opacity(0.5f);
                borderColourFocused = BorderColour;

                updateBorder();
            }

            protected override void OnFocus(FocusEvent e)
            {
                base.OnFocus(e);

                updateBorder();
            }

            protected override void OnFocusLost(FocusLostEvent e)
            {
                base.OnFocusLost(e);

                updateBorder();
            }

            private void updateBorder()
            {
                BorderThickness = border_thickness;
                BorderColour = HasFocus ? borderColourFocused : borderColourUnfocused;
            }
        }
    }
}