src/Carnac/UI/KeyShowView.xaml.cs

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using System;
using System.Runtime.InteropServices;
using System.Timers;
using System.Windows;
using System.Windows.Interop;
using Carnac.Logic;

namespace Carnac.UI
{
    public partial class KeyShowView
    {
        public KeyShowView(KeyShowViewModel keyShowViewModel)
        {
            DataContext = keyShowViewModel;
            InitializeComponent();
        }

        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);

            var hwnd = new WindowInteropHelper(this).Handle;
            Win32Methods.SetWindowExTransparent(hwnd);

            var timer = new Timer(100);
            timer.Elapsed +=
                (s, x) =>
                {
                    SetWindowPos(hwnd,
                                 HWND.TOPMOST,
                                 0, 0, 0, 0,
                                 (uint)(SWP.NOMOVE | SWP.NOSIZE | SWP.SHOWWINDOW));
                };

            timer.Start();

            var vm = ((KeyShowViewModel)DataContext);
            Left = vm.Settings.Left;
            vm.Settings.LeftChanged += SettingsLeftChanged;
            WindowState = WindowState.Maximized;
        }

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int W, int H, uint uFlags);


        /// <summary>
        /// HWND values for hWndInsertAfter
        /// </summary>
        public static class HWND
        {
            public static readonly IntPtr
            NOTOPMOST = new IntPtr(-2),
            BROADCAST = new IntPtr(0xffff),
            TOPMOST = new IntPtr(-1),
            TOP = new IntPtr(0),
            BOTTOM = new IntPtr(1);
        }