Implement DismissableFlag component for rankings overlay (#6065)

Implement DismissableFlag component for rankings overlay

Co-authored-by: Dean Herbert <pe@ppy.sh>

osu.Game.Tests/Visual/Online/TestSceneRankingsDismissableFlag.cs

@@ -0,0 +1,65 @@
+// 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 System;
+using System.Collections.Generic;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics;
+using osu.Game.Overlays.Rankings;
+using osu.Game.Users;
+using osuTK;
+
+namespace osu.Game.Tests.Visual.Online
+{
+    public class TestSceneRankingsDismissableFlag : OsuTestScene
+    {
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(DismissableFlag),
+        };
+
+        public TestSceneRankingsDismissableFlag()
+        {
+            DismissableFlag flag;
+            SpriteText text;
+
+            var countryA = new Country
+            {
+                FlagName = "BY",
+                FullName = "Belarus"
+            };
+
+            var countryB = new Country
+            {
+                FlagName = "US",
+                FullName = "United States"
+            };
+
+            AddRange(new Drawable[]
+            {
+                flag = new DismissableFlag
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Size = new Vector2(30, 20),
+                    Country = countryA,
+                },
+                text = new SpriteText
+                {
+                    Anchor = Anchor.TopCentre,
+                    Origin = Anchor.TopCentre,
+                    Text = "Invoked",
+                    Font = OsuFont.GetFont(size: 30),
+                    Alpha = 0,
+                }
+            });
+
+            flag.Action += () => text.FadeIn().Then().FadeOut(1000, Easing.OutQuint);
+
+            AddStep("Trigger click", () => flag.Click());
+            AddStep("Change to country 2", () => flag.Country = countryB);
+            AddStep("Change to country 1", () => flag.Country = countryA);
+        }
+    }
+}

osu.Game/Overlays/Rankings/DismissableFlag.cs

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+// 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.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Users.Drawables;
+using osuTK.Graphics;
+using osuTK;
+using osu.Framework.Input.Events;
+using System;
+
+namespace osu.Game.Overlays.Rankings
+{
+    public class DismissableFlag : UpdateableFlag
+    {
+        private const int duration = 200;
+
+        public Action Action;
+
+        private readonly SpriteIcon hoverIcon;
+
+        public DismissableFlag()
+        {
+            AddInternal(hoverIcon = new SpriteIcon
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Depth = -1,
+                Alpha = 0,
+                Size = new Vector2(10),
+                Icon = FontAwesome.Solid.Times,
+            });
+        }
+
+        protected override bool OnHover(HoverEvent e)
+        {
+            hoverIcon.FadeIn(duration, Easing.OutQuint);
+            this.FadeColour(Color4.Gray, duration, Easing.OutQuint);
+            return base.OnHover(e);
+        }
+
+        protected override void OnHoverLost(HoverLostEvent e)
+        {
+            base.OnHoverLost(e);
+            hoverIcon.FadeOut(duration, Easing.OutQuint);
+            this.FadeColour(Color4.White, duration, Easing.OutQuint);
+        }
+
+        protected override bool OnClick(ClickEvent e)
+        {
+            Action?.Invoke();
+            return true;
+        }
+    }
+}