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Initial setup of CursorKeeper
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‎CursorKeeper.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.12.35707.178 d17.12
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CursorKeeper", "CursorKeeper\CursorKeeper.csproj", "{D72F4513-6DDE-4933-924F-38F044FE8D0F}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{D72F4513-6DDE-4933-924F-38F044FE8D0F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{D72F4513-6DDE-4933-924F-38F044FE8D0F}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{D72F4513-6DDE-4933-924F-38F044FE8D0F}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{D72F4513-6DDE-4933-924F-38F044FE8D0F}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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EndGlobal

‎CursorKeeper/CursorKeeper.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>WinExe</OutputType>
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<TargetFramework>net8.0-windows</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>disable</ImplicitUsings>
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<UseWindowsForms>true</UseWindowsForms>
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</PropertyGroup>
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<ItemGroup>
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<None Remove="Resources\tray-icon16.png" />
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</ItemGroup>
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<ItemGroup>
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<EmbeddedResource Include="Resources\tray-icon16.png" />
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</ItemGroup>
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</Project>

‎CursorKeeper/CursorKeeperContext.cs‎

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using System;
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using System.Drawing;
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using System.Windows.Forms;
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using CursorKeeper.Services.CursorConstraint;
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namespace CursorKeeper
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{
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public sealed class CursorKeeperContext : ApplicationContext, IDisposable
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{
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private readonly NotifyIcon _trayIcon;
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private readonly ICursorConstraintService _cursorService;
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private readonly ToolStripMenuItem _enableMenuItem;
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private bool _disposed;
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public CursorKeeperContext()
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{
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(_trayIcon, _enableMenuItem) = InitializeComponents();
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_cursorService = new CursorConstraintService();
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_cursorService.EnableConstraints(); // Start with constraints enabled
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}
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private (NotifyIcon icon, ToolStripMenuItem menuItem) InitializeComponents()
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{
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// Create context menu
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var contextMenu = new ContextMenuStrip();
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var enableMenuItem = new ToolStripMenuItem("Disable CursorKeeper", null, ToggleConstraints);
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var exitMenuItem = new ToolStripMenuItem("Exit", null, Exit);
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contextMenu.Items.AddRange(new ToolStripItem[]
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{
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enableMenuItem,
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new ToolStripSeparator(),
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exitMenuItem
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});
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// Create tray icon
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var icon = new NotifyIcon
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{
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Icon = CreateCursorIcon(),
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ContextMenuStrip = contextMenu,
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Text = "CursorKeeper - Active",
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Visible = true
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};
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icon.MouseClick += (s, e) =>
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{
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if (e.Button == MouseButtons.Left)
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icon.ContextMenuStrip.Show(Cursor.Position);
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};
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return (icon, enableMenuItem);
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}
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private static Icon CreateCursorIcon()
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{
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using var stream = typeof(CursorKeeperContext).Assembly
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.GetManifestResourceStream("CursorKeeper.Resources.tray-icon16.png");
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if (stream == null)
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throw new InvalidOperationException("Could not load tray icon resource");
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using var bitmap = new Bitmap(stream);
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return Icon.FromHandle(bitmap.GetHicon());
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}
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private void ToggleConstraints(object? sender, EventArgs e)
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{
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if (_cursorService.IsEnabled)
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{
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_cursorService.DisableConstraints();
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_enableMenuItem.Text = "Enable CursorKeeper";
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_trayIcon.Text = "CursorKeeper - Inactive";
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}
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else
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{
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_cursorService.EnableConstraints();
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_enableMenuItem.Text = "Disable CursorKeeper";
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_trayIcon.Text = "CursorKeeper - Active";
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}
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}
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private void Exit(object? sender, EventArgs e)
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{
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Dispose();
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Application.Exit();
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}
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public void Dispose()
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{
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if (_disposed) return;
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_trayIcon.Visible = false;
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_trayIcon.Dispose();
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_cursorService.Dispose();
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_disposed = true;
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GC.SuppressFinalize(this);
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}
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}
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}

‎CursorKeeper/Program.cs‎

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using System;
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using System.Windows.Forms;
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namespace CursorKeeper
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{
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public class Program
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{
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[STAThread]
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static void Main()
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{
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Application.EnableVisualStyles();
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Application.SetCompatibleTextRenderingDefault(false);
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Application.SetHighDpiMode(HighDpiMode.SystemAware);
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Application.Run(new CursorKeeperContext());
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}
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}
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}

‎CursorKeeper/Resources/tray-icon16.png‎

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‎CursorKeeper/Resources/tray-ison.svg‎

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‎CursorKeeper/Services/CursorConstraint/CursorConstraintService.cs‎

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using System;
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using System.Drawing;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace CursorKeeper.Services.CursorConstraint
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{
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public sealed class CursorConstraintService : ICursorConstraintService
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{
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private const int WH_MOUSE_LL = 14;
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private const int WM_MOUSEMOVE = 0x200;
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private const int HC_ACTION = 0;
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private const int EDGE_PADDING = 2;
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private IntPtr _hookHandle = IntPtr.Zero;
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private readonly MouseHookDelegate _hookDelegate;
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private readonly Screen _primaryScreen;
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private Point _lastValidPosition;
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private bool _disposed;
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public bool IsEnabled { get; private set; }
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private delegate IntPtr MouseHookDelegate(int nCode, IntPtr wParam, ref MSLLHOOKSTRUCT lParam);
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[StructLayout(LayoutKind.Sequential)]
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private struct POINT
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{
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public int x;
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public int y;
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}
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[StructLayout(LayoutKind.Sequential)]
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private struct MSLLHOOKSTRUCT
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{
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public POINT pt;
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public int mouseData;
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public int flags;
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public int time;
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public IntPtr dwExtraInfo;
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}
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[DllImport("user32.dll")]
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private static extern IntPtr SetWindowsHookEx(int idHook, MouseHookDelegate lpfn, IntPtr hMod, uint dwThreadId);
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[DllImport("user32.dll")]
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private static extern bool UnhookWindowsHookEx(IntPtr hhk);
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[DllImport("user32.dll")]
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private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, ref MSLLHOOKSTRUCT lParam);
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[DllImport("user32.dll")]
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private static extern bool SetCursorPos(int x, int y);
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public CursorConstraintService()
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{
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_hookDelegate = MouseHookCallback;
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_primaryScreen = Screen.PrimaryScreen ?? throw new InvalidOperationException("No primary screen found");
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_lastValidPosition = Cursor.Position;
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}
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public void EnableConstraints()
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{
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if (IsEnabled) return;
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_hookHandle = SetWindowsHookEx(WH_MOUSE_LL, _hookDelegate, IntPtr.Zero, 0);
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if (_hookHandle == IntPtr.Zero)
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throw new InvalidOperationException("Failed to set mouse hook");
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IsEnabled = true;
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}
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public void DisableConstraints()
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{
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if (!IsEnabled || _hookHandle == IntPtr.Zero) return;
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UnhookWindowsHookEx(_hookHandle);
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_hookHandle = IntPtr.Zero;
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IsEnabled = false;
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}
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private IntPtr MouseHookCallback(int nCode, IntPtr wParam, ref MSLLHOOKSTRUCT lParam)
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{
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if (nCode == HC_ACTION && wParam == (IntPtr)WM_MOUSEMOVE)
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{
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var currentPos = new Point(lParam.pt.x, lParam.pt.y);
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if (!IsPositionInPrimaryScreen(currentPos))
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{
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var newPos = CalculateValidPosition(currentPos);
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SetCursorPos(newPos.X, newPos.Y);
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_lastValidPosition = newPos;
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return (IntPtr)1;
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}
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_lastValidPosition = currentPos;
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}
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return CallNextHookEx(_hookHandle, nCode, wParam, ref lParam);
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}
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private bool IsPositionInPrimaryScreen(Point position)
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{
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var paddedBounds = new Rectangle(
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_primaryScreen.Bounds.Left + EDGE_PADDING,
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_primaryScreen.Bounds.Top + EDGE_PADDING,
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_primaryScreen.Bounds.Width - (2 * EDGE_PADDING),
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_primaryScreen.Bounds.Height - (2 * EDGE_PADDING)
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);
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return paddedBounds.Contains(position);
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}
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private Point CalculateValidPosition(Point currentPos) =>
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new(
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Math.Max(_primaryScreen.Bounds.Left + EDGE_PADDING,
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Math.Min(currentPos.X, _primaryScreen.Bounds.Right - EDGE_PADDING)),
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Math.Max(_primaryScreen.Bounds.Top + EDGE_PADDING,
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Math.Min(currentPos.Y, _primaryScreen.Bounds.Bottom - EDGE_PADDING))
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);
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public void Dispose()
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{
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if (_disposed) return;
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DisableConstraints();
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_disposed = true;
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GC.SuppressFinalize(this);
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}
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}
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}

‎CursorKeeper/Services/CursorConstraint/ICursorConstraintService.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace CursorKeeper.Services.CursorConstraint
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{
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public interface ICursorConstraintService : IDisposable
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{
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bool IsEnabled { get; }
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void EnableConstraints();
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void DisableConstraints();
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}
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}

‎screenshots/tray-icon.png‎

2.48 KB
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