Add winalfred workflow installer

WinAlfred/Helper/DwmDropShadow.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Drawing.Printing;
+using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Interop;
+
+namespace WinAlfred.Helper
+{
+    public static class DwmDropShadow
+    {
+
+        [DllImport("dwmapi.dll", PreserveSig = true)]
+        private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
+
+        [DllImport("dwmapi.dll")]
+        private static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref Margins pMarInset);
+
+        /// <summary>
+        /// Drops a standard shadow to a WPF Window, even if the window isborderless. Only works with DWM (Vista and Seven).
+        /// This method is much more efficient than setting AllowsTransparency to true and using the DropShadow effect,
+        /// as AllowsTransparency involves a huge permormance issue (hardware acceleration is turned off for all the window).
+        /// </summary>
+        /// <param name="window">Window to which the shadow will be applied</param>
+        public static void DropShadowToWindow(Window window)
+        {
+            if (!DropShadow(window))
+            {
+                window.SourceInitialized += new EventHandler(window_SourceInitialized);
+            }
+        }
+
+        private static void window_SourceInitialized(object sender, EventArgs e) //fixed typo
+        {
+            Window window = (Window)sender;
+
+            DropShadow(window);
+
+            window.SourceInitialized -= new EventHandler(window_SourceInitialized);
+        }
+
+        /// <summary>
+        /// The actual method that makes API calls to drop the shadow to the window
+        /// </summary>
+        /// <param name="window">Window to which the shadow will be applied</param>
+        /// <returns>True if the method succeeded, false if not</returns>
+        private static bool DropShadow(Window window)
+        {
+            try
+            {
+                WindowInteropHelper helper = new WindowInteropHelper(window);
+                int val = 2;
+                int ret1 = DwmSetWindowAttribute(helper.Handle, 2, ref val, 2);
+
+                if (ret1 == 0)
+                {
+                    Margins m = new Margins { Bottom = 0, Left = 0, Right = 0, Top = 0 };
+                    int ret2 = DwmExtendFrameIntoClientArea(helper.Handle, ref m);
+                    return ret2 == 0;
+                }
+                else
+                {
+                    return false;
+                }
+            }
+            catch (Exception ex)
+            {
+                // Probably dwmapi.dll not found (incompatible OS)
+                return false;
+            }
+        }
+
+    }
+}