Add project files.

LPaper.cs

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+using System.Runtime.InteropServices;
+using CefSharp;
+using CefSharp.WinForms;
+using System.Diagnostics;
+
+namespace LWallPaper;
+public partial class LPaper : Form
+{
+    private NotifyIcon trayIcon;
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
+
+    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
+    public static extern IntPtr SendMessageTimeout(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam, SendMessageTimeoutFlags fuFlags, uint uTimeout, out IntPtr lpdwResult);
+
+    [DllImport("user32.dll")]
+    public static extern bool EnumWindows(EnumWindowsProc enumProc, IntPtr lParam);
+    public delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, IntPtr windowTitle);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
+
+    public enum SendMessageTimeoutFlags : uint
+    {
+        SMTO_NORMAL = 0x0,
+        SMTO_BLOCK = 0x1,
+        SMTO_ABORTIFHUNG = 0x2,
+        SMTO_NOTIMEOUTIFNOTHUNG = 0x8,
+        SMTO_ERRORONEXIT = 0x20
+    }
+
+    private static IntPtr workerw;
+
+    public LPaper()
+    {
+        InitializeComponent();
+        setSystemTray();
+        setForm(createBrowser());
+
+        Load += new EventHandler(Form1_Load);
+    }
+
+    private void setForm(ChromiumWebBrowser browser)
+    {
+        FormBorderStyle = FormBorderStyle.None;
+        WindowState = FormWindowState.Maximized;
+        TopMost = false;
+        Controls.Add(browser);
+    }
+
+    private ChromiumWebBrowser createBrowser()
+    {
+        CefSettings settings = new CefSettings();
+        Cef.Initialize(settings);
+
+        string exePath = AppDomain.CurrentDomain.BaseDirectory;
+        string url = Path.Combine(exePath, "index.html");
+        var browser = new ChromiumWebBrowser(exePath);
+
+        browser.LoadUrl(url);
+
+        return browser;
+    }
+
+    private void setSystemTray()
+    {
+        trayIcon = new NotifyIcon();
+
+        // Set the icon for the tray icon
+        trayIcon.Icon = new Icon("Resources/icon.ico");
+
+        // Set the text for the tray icon
+        trayIcon.Text = "LWallPaper";
+
+        // Add a context menu strip to the tray icon
+        ContextMenuStrip trayMenu = new ContextMenuStrip();
+        trayMenu.Items.Add("Exit", null, OnExit);
+        trayIcon.ContextMenuStrip = trayMenu;
+
+        // Show the tray icon
+        trayIcon.Visible = true;
+    }
+
+    private void Form1_Load(object sender, EventArgs e)
+    {
+        IntPtr progman = FindWindow("Progman", null);
+        IntPtr result = IntPtr.Zero;
+        workerw = IntPtr.Zero;
+
+        SendMessageTimeout(progman, 0x052C, new IntPtr(0), IntPtr.Zero, SendMessageTimeoutFlags.SMTO_NORMAL, 1000, out result);
+
+        EnumWindows(new EnumWindowsProc((tophandle, topparamhandle) =>
+        {
+            IntPtr shellDefViewHandle = FindWindowEx(tophandle, IntPtr.Zero, "SHELLDLL_DefView", IntPtr.Zero);
+
+            if (shellDefViewHandle != IntPtr.Zero)
+            {
+                // Gets the WorkerW Window after the current one.
+                workerw = FindWindowEx(IntPtr.Zero, tophandle, "WorkerW", IntPtr.Zero);
+            }
+
+            return true;
+        }), IntPtr.Zero);
+
+        SetParent(this.Handle, workerw);
+
+        // Get all screens
+        Screen[] screens = Screen.AllScreens;
+
+        // Choose the primary screen
+        Screen primaryScreen = Screen.PrimaryScreen;
+
+        // Get the working area (considering taskbar space) of the primary screen
+        Rectangle workingArea = primaryScreen.WorkingArea;
+
+        // We adjust for this by offsetting our window position with the smallest left bound among all screens.
+        int offset = screens.Min(screen => screen.Bounds.Left);
+
+        // Set the position and size of the window to fit the primary screen, considering offset
+        SetWindowPos(this.Handle, IntPtr.Zero, workingArea.Left + Math.Abs(offset), workingArea.Top, workingArea.Width, workingArea.Height, 0);
+    }
+
+    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
+    {
+        Cef.Shutdown();
+    }
+
+    private void OnExit(object sender, EventArgs e)
+    {
+        //  shut down the browser
+        Cef.Shutdown();
+        // Get a handle for the Progman window
+        IntPtr progman = FindWindow("Progman", null);
+
+        // Send a message to Progman to refresh the desktop
+        SendMessageTimeout(progman, 0x052C, new IntPtr(0), IntPtr.Zero, SendMessageTimeoutFlags.SMTO_NORMAL, 1000, out _);
+
+        // really bad solution, but is done to avoid weirdness in in the desktop background
+        Process[] explorer = Process.GetProcessesByName("explorer");
+
+        foreach (Process process in explorer)
+            process.Kill();
+
+        Application.Exit();
+    }
+}
+