add win32 api DwmSetIconicLivePreviewBitmap

Author: yanjinhuagood

src/WPFDevelopers.Shared/Core/Helpers/Win32.cs

@@ -1,4 +1,5 @@
-using System;
+using Standard;
+using System;
 using System.Runtime.InteropServices;
 using System.Text;
 using System.Windows.Interop;
@@ -192,6 +193,9 @@ public static bool EnableDarkModeForWindow(HwndSource source, bool enable)
         [DllImport(DwmApi)]
         public static extern int DwmInvalidateIconicBitmaps(IntPtr hwnd);
 
+        [DllImport(DwmApi)]
+        public static extern int DwmSetIconicLivePreviewBitmap(IntPtr hwnd, IntPtr hBitmap, IntPtr pptClient, DWM_SIT dwSITFlags);
+
         [DllImport(User32)]
         public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
 
@@ -218,6 +222,7 @@ internal class WindowsMessageCodes
         public const int WM_NCHITTEST = 0x0084;
 
         public const int WM_DWMSENDICONICTHUMBNAIL = 0x0323;
+        public const int WM_DWMSENDICONICLIVEPREVIEWBITMAP = 0x0326;
     }
 
     [Flags]
@@ -230,4 +235,10 @@ public enum DwmWindowAttributes : uint
         UseImmersiveDarkMode = 20
     }
 
+    [Flags]
+    public enum DWM_SIT : uint
+    {
+        None = 0x0,
+        DisplayFrame = 0x1
+    }
 }

src/WPFDevelopers.Shared/Core/Helpers/WindowHelpers.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Drawing;
 using System.IO;
 using System.Runtime.InteropServices;
@@ -89,6 +90,23 @@ public static void SetIconicThumbnail(this Window window, string imagePath)
 
                         handled = true;
                     }
+                    if (msg == WindowsMessageCodes.WM_DWMSENDICONICLIVEPREVIEWBITMAP)
+                    {
+                        try
+                        {
+                            using (var bmp = new Bitmap(imagePath))
+                            {
+                                IntPtr hBitmap = bmp.GetHbitmap();
+                                Win32.DwmSetIconicLivePreviewBitmap(hwnd2, hBitmap, IntPtr.Zero, 0);
+                                Win32.DeleteObject(hBitmap);
+                            }
+                        }
+                        catch (Exception ex)
+                        {
+                            Debug.WriteLine($"LivePreview error: {ex.Message}");
+                        }
+                        handled = true;
+                    }
 
                     return IntPtr.Zero;
                 }));