Block input and show loading when submitting registration

osu.Game/Graphics/UserInterface/ProcessingOverlay.cs

@@ -0,0 +1,56 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input.Events;
+using osuTK.Graphics;
+
+namespace osu.Game.Graphics.UserInterface
+{
+    /// <summary>
+    /// An overlay that will consume all available space and block input when required.
+    /// Useful for disabling all elements in a form and showing we are waiting on a response, for instance.
+    /// </summary>
+    public class ProcessingOverlay : VisibilityContainer
+    {
+        private const float transition_duration = 200;
+
+        public ProcessingOverlay()
+        {
+            RelativeSizeAxes = Axes.Both;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            InternalChildren = new Drawable[]
+            {
+                new Box
+                {
+                    Colour = Color4.Black,
+                    RelativeSizeAxes = Axes.Both,
+                    Alpha = 0.9f,
+                },
+                new LoadingAnimation { State = Visibility.Visible }
+            };
+        }
+
+        protected override bool Handle(UIEvent e)
+        {
+            return true;
+        }
+
+        protected override void PopIn()
+        {
+            this.FadeIn(transition_duration * 2, Easing.OutQuint);
+        }
+
+        protected override void PopOut()
+        {
+            this.FadeOut(transition_duration, Easing.OutQuint);
+        }
+    }
+}