Make LoginOverlay mask better.

osu.Game/Overlays/Toolbar/ToolbarUserArea.cs

@@ -0,0 +1,46 @@
+//Copyright (c) 2007-2016 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.Primitives;
+using OpenTK;
+
+namespace osu.Game.Overlays.Toolbar
+{
+    class ToolbarUserArea : Container
+    {
+        private LoginOverlay loginOverlay;
+        private ToolbarUserButton button;
+
+        public override RectangleF BoundingBox => button.BoundingBox;
+
+        public override bool Contains(Vector2 screenSpacePos) => true;
+
+        public override Vector2 Size => button.Size;
+
+        public ToolbarUserArea()
+        {
+            RelativeSizeAxes = Axes.Y;
+
+            Children = new Drawable[] {
+                button = new ToolbarUserButton
+                {
+                    Action = toggle,
+                },
+                loginOverlay = new LoginOverlay
+                {
+                    Position = new Vector2(0, 1),
+                    RelativePositionAxes = Axes.Y,
+                    Anchor = Anchor.TopRight,
+                    Origin = Anchor.TopRight,
+                }
+            };
+        }
+
+        private void toggle()
+        {
+            loginOverlay.ToggleVisibility();
+        }
+    }
+}