osu/osu.Game/Overlays/Music/CollectionsDropdown.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 OpenTK;
using OpenTK.Graphics;
using osu.Framework.Allocation;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.UserInterface;
using osu.Game.Graphics;
using osu.Game.Graphics.UserInterface;

public class CollectionsDropdown<T> : OsuDropdown<T>
{
    protected override DropdownHeader CreateHeader() => new CollectionsHeader { AccentColour = AccentColour };
    protected override Menu CreateMenu() => new CollectionsMenu();

    [BackgroundDependencyLoader]
    private void load(OsuColour colours)
    {
        AccentColour = colours.Gray6;
    }

    private class CollectionsHeader : OsuDropdownHeader
    {
        [BackgroundDependencyLoader]
        private void load(OsuColour colours)
        {
            BackgroundColour = colours.Gray4;
        }

        public CollectionsHeader()
        {
            CornerRadius = 5;
            Height = 30;
            Icon.TextSize = 14;
            Icon.Margin = new MarginPadding(0);
            Foreground.Padding = new MarginPadding { Top = 4, Bottom = 4, Left = 10, Right = 10 };
            EdgeEffect = new EdgeEffect
            {
                Type = EdgeEffectType.Shadow,
                Colour = Color4.Black.Opacity(0.3f),
                Radius = 3,
                Offset = new Vector2(0f, 1f),
            };
        }
    }

    private class CollectionsMenu : OsuMenu
    {
        [BackgroundDependencyLoader]
        private void load(OsuColour colours)
        {
            Background.Colour = colours.Gray4;
        }

        public CollectionsMenu()
        {
            CornerRadius = 5;
            EdgeEffect = new EdgeEffect
            {
                Type = EdgeEffectType.Shadow,
                Colour = Color4.Black.Opacity(0.3f),
                Radius = 3,
                Offset = new Vector2(0f, 1f),
            };
        }
    }
}