osu/osu.Game/Input/IdleTracker.cs

// 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 osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Input;
using osu.Framework.Input.Bindings;
using osu.Framework.Input.Events;

namespace osu.Game.Input
{
    /// <summary>
    /// Track whether the end-user is in an idle state, based on their last interaction with the game.
    /// </summary>
    public class IdleTracker : Component, IKeyBindingHandler<PlatformAction>, IHandleGlobalKeyboardInput
    {
        private readonly double timeToIdle;

        private double lastInteractionTime;

        protected double TimeSpentIdle => Clock.CurrentTime - lastInteractionTime;

        /// <summary>
        /// Whether the user is currently in an idle state.
        /// </summary>
        public IBindable<bool> IsIdle => isIdle;

        private readonly BindableBool isIdle = new BindableBool();

        /// <summary>
        /// Whether the game can currently enter an idle state.
        /// </summary>
        protected virtual bool AllowIdle => true;

        /// <summary>
        /// Intstantiate a new <see cref="IdleTracker"/>.
        /// </summary>
        /// <param name="timeToIdle">The length in milliseconds until an idle state should be assumed.</param>
        public IdleTracker(double timeToIdle)
        {
            this.timeToIdle = timeToIdle;
            RelativeSizeAxes = Axes.Both;
        }

        protected override void Update()
        {
            base.Update();
            isIdle.Value = TimeSpentIdle > timeToIdle && AllowIdle;
        }

        public bool OnPressed(PlatformAction action) => updateLastInteractionTime();

        public void OnReleased(PlatformAction action) => updateLastInteractionTime();

        protected override bool Handle(UIEvent e)
        {
            switch (e)
            {
                case KeyDownEvent _:
                case KeyUpEvent _:
                case MouseDownEvent _:
                case MouseUpEvent _:
                case MouseMoveEvent _:
                    return updateLastInteractionTime();

                default:
                    return base.Handle(e);
            }
        }

        private bool updateLastInteractionTime()
        {
            lastInteractionTime = Clock.CurrentTime;
            return false;
        }
    }
}