Refactor PowerStatus (now called BatteryInfo)

osu.Game/Utils/BatteryInfo.cs

@@ -0,0 +1,24 @@
+// 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.
+
+namespace osu.Game.Utils
+{
+    /// <summary>
+    /// Provides access to the system's power status.
+    /// </summary>
+    public abstract class BatteryInfo
+    {
+        /// <summary>
+        /// The charge level of the battery, from 0 to 1.
+        /// </summary>
+        public abstract double ChargeLevel { get; }
+
+        public abstract bool IsCharging { get; }
+
+        /// <summary>
+        /// Whether the battery is currently low in charge.
+        /// Returns true if not charging and current charge level is lower than or equal to 25%.
+        /// </summary>
+        public bool IsLowBattery => !IsCharging && ChargeLevel <= 0.25;
+    }
+}