Inertia – Rev 1

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using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using WindowsInput;
using AutoUpdaterDotNET;
using Gma.System.MouseKeyHook;

namespace Inertia
{
    public partial class Form1 : Form
    {
        #region Static Fields and Constants

        private static IKeyboardMouseEvents _globalMouseKeyHook;

        private static InputSimulator _inputSimulator;

        private static ScheduledContinuation _scrollUpContinuation;

        private static long _upDelta;

        private static long _downDelta;

        private static ScheduledContinuation _scrollDownContinuation;

        private static CancellationTokenSource _scrollCancellationTokenSource;

        #endregion

        #region Private Delegates, Events, Enums, Properties, Indexers and Fields

        private AboutForm _aboutForm;

        #endregion

        #region Constructors, Destructors and Finalizers

        public Form1()
        {
            InitializeComponent();
            AutoUpdater.Start("http://inertia.grimore.org/update/update.xml");

            _inputSimulator = new InputSimulator();

            _globalMouseKeyHook = Hook.GlobalEvents();
            _globalMouseKeyHook.MouseWheel += GlobalMouseKeyHookMouseWheel;

            _scrollUpContinuation = new ScheduledContinuation();
            _scrollDownContinuation = new ScheduledContinuation();
        }

        /// <summary>
        ///     Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && components != null)
            {
                _globalMouseKeyHook.MouseWheel -= GlobalMouseKeyHookMouseWheel;
                _globalMouseKeyHook.Dispose();

                components.Dispose();
            }

            base.Dispose(disposing);
        }

        #endregion

        #region Event Handlers

        private static void GlobalMouseKeyHookMouseWheel(object sender, MouseEventArgs e)
        {
            var delta = Math.Abs(e.Delta);

            switch (Math.Sign(e.Delta))
            {
                case 0:
                    break;
                case 1: // up
                    Interlocked.Add(ref _upDelta, delta);
                    _scrollUpContinuation.Schedule(TimeSpan.FromMilliseconds(50), ScrollUp);
                    Debug.WriteLine($"Mouse wheel moved up by {e.Delta}.");
                    break;
                case -1: // down
                    Interlocked.Add(ref _downDelta, delta);
                    _scrollDownContinuation.Schedule(TimeSpan.FromMilliseconds(50), ScrollDown);
                    Debug.WriteLine($"Mouse wheel moved down by {e.Delta}.");
                    break;
            }
        }

        private void AboutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (_aboutForm != null)
            {
                return;
            }

            _aboutForm = new AboutForm();
            _aboutForm.Closing += AboutForm_Closing;
            _aboutForm.Show();
        }

        private void AboutForm_Closing(object sender, CancelEventArgs e)
        {
            if (_aboutForm == null)
            {
                return;
            }

            _aboutForm.Closing -= AboutForm_Closing;
            _aboutForm.Dispose();
            _aboutForm = null;
        }

        private void QuitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        #endregion

        #region Private Methods

        private static async void ScrollDown()
        {
            var downDelta = Interlocked.Read(ref _downDelta);
            var delta = Math.Abs(downDelta / SystemInformation.MouseWheelScrollDelta);
            Interlocked.Exchange(ref _downDelta, 0);

            Debug.WriteLine($"Down event expired with delta {delta}");

            if (_scrollCancellationTokenSource != null)
            {
                _scrollCancellationTokenSource.Cancel();
            }

            _scrollCancellationTokenSource = new CancellationTokenSource();
            var cancellationToken = _scrollCancellationTokenSource.Token;

            _globalMouseKeyHook.MouseWheel -= GlobalMouseKeyHookMouseWheel;

            try
            {
                await ScrollDown((int) delta, cancellationToken);
            }
            finally
            {
                _globalMouseKeyHook.MouseWheel += GlobalMouseKeyHookMouseWheel;
            }
        }

        private static async void ScrollUp()
        {
            var upDelta = Interlocked.Read(ref _upDelta);
            var delta = Math.Abs(upDelta / SystemInformation.MouseWheelScrollDelta);
            Interlocked.Exchange(ref _upDelta, 0);

            Debug.WriteLine($"Up event expired with delta {delta}");

            if (_scrollCancellationTokenSource != null)
            {
                _scrollCancellationTokenSource.Cancel();
            }

            _scrollCancellationTokenSource = new CancellationTokenSource();
            var cancellationToken = _scrollCancellationTokenSource.Token;

            _globalMouseKeyHook.MouseWheel -= GlobalMouseKeyHookMouseWheel;

            try
            {
                await ScrollUp((int) delta, cancellationToken);
            }
            finally
            {
                _globalMouseKeyHook.MouseWheel += GlobalMouseKeyHookMouseWheel;
            }
        }

        private static async Task ScrollUp(int delta, CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested && delta > 0)
            {
                _inputSimulator.Mouse.VerticalScroll(delta);
                await Task.Delay(25 * delta, cancellationToken);
                Debug.WriteLine($"Moving: {delta}");
                delta = (int) Math.Log(delta, 2);
            }
        }

        private static async Task ScrollDown(int delta, CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested && delta > 0)
            {
                _inputSimulator.Mouse.VerticalScroll(-delta);
                await Task.Delay(25 * delta, cancellationToken);
                Debug.WriteLine($"Moving: {delta}");
                delta = (int) Math.Log(delta, 2);
            }
        }

        #endregion
    }
}

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