Add keybinding repeat extension method

osu.Game/Extensions/DrawableExtensions.cs

@@ -0,0 +1,32 @@
+// 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 osu.Framework.Input.Bindings;
+using osu.Framework.Threading;
+
+namespace osu.Game.Extensions
+{
+    public static class DrawableExtensions
+    {
+        /// <summary>
+        /// Helper method that is used while <see cref="IKeyBindingHandler"/> doesn't support repetitions of <see cref="IKeyBindingHandler{T}.OnPressed"/>.
+        /// Simulates repetitions by continually invoking a delegate according to the default key repeat rate.
+        /// </summary>
+        /// <remarks>
+        /// The returned delegate can be cancelled to stop repeat events from firing (usually in <see cref="IKeyBindingHandler{T}.OnReleased"/>).
+        /// </remarks>
+        /// <param name="handler">The <see cref="IKeyBindingHandler{T}"/> which is handling the repeat.</param>
+        /// <param name="scheduler">The <see cref="Scheduler"/> to schedule repetitions on.</param>
+        /// <param name="action">The <see cref="Action"/> to be invoked once immediately and with every repetition.</param>
+        /// <returns>A <see cref="ScheduledDelegate"/> which can be cancelled to stop the repeat events from firing.</returns>
+        public static ScheduledDelegate BeginKeyRepeat(this IKeyBindingHandler handler, Scheduler scheduler, Action action)
+        {
+            action();
+
+            ScheduledDelegate repeatDelegate = new ScheduledDelegate(action, handler.Time.Current + 250, 70);
+            scheduler.Add(repeatDelegate);
+            return repeatDelegate;
+        }
+    }
+}