Merge branch 'master' into mapping-del

osu.Game/Overlays/HoldToConfirmOverlay.cs

@@ -0,0 +1,66 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using OpenTK.Graphics;
+
+namespace osu.Game.Overlays
+{
+    /// <summary>
+    /// An overlay which will display a black screen that dims over a period before confirming an exit action.
+    /// Action is BYO (derived class will need to call <see cref="BeginConfirm"/> and <see cref="AbortConfirm"/> from a user event).
+    /// </summary>
+    public abstract class HoldToConfirmOverlay : Container
+    {
+        public Action Action;
+
+        private Box overlay;
+
+        private const int activate_delay = 400;
+        private const int fadeout_delay = 200;
+
+        private bool fired;
+
+        /// <summary>
+        /// Whether the overlay should be allowed to return from a fired state.
+        /// </summary>
+        protected virtual bool AllowMultipleFires => false;
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            RelativeSizeAxes = Axes.Both;
+            AlwaysPresent = true;
+
+            Children = new Drawable[]
+            {
+                overlay = new Box
+                {
+                    Alpha = 0,
+                    Colour = Color4.Black,
+                    RelativeSizeAxes = Axes.Both,
+                }
+            };
+        }
+
+        protected void BeginConfirm()
+        {
+            if (!AllowMultipleFires && fired) return;
+            overlay.FadeIn(activate_delay * (1 - overlay.Alpha), Easing.Out).OnComplete(_ =>
+            {
+                Action?.Invoke();
+                fired = true;
+            });
+        }
+
+        protected void AbortConfirm()
+        {
+            if (!AllowMultipleFires && fired) return;
+            overlay.FadeOut(fadeout_delay, Easing.Out);
+        }
+    }
+}

osu.Game/Overlays/VolumeOverlay.cs

@@ -100,6 +100,8 @@ namespace osu.Game.Overlays
 
         public bool Adjust(GlobalAction action)
         {
+            if (!IsLoaded) return false;
+
             switch (action)
             {
                 case GlobalAction.DecreaseVolume: