Added Theme colours so it's on Twitch Brand

TwitchDesktopNotifications/ReconnectionNeeded.xaml.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
@@ -8,6 +9,7 @@ using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
+using System.Windows.Interop;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Shapes;
@@ -19,9 +21,63 @@ namespace TwitchDesktopNotifications
     /// </summary>
     public partial class ReconnectionNeeded : Window
     {
+
+        public enum DWMWINDOWATTRIBUTE
+        {
+            DWMWA_NCRENDERING_ENABLED,
+            DWMWA_NCRENDERING_POLICY,
+            DWMWA_TRANSITIONS_FORCEDISABLED,
+            DWMWA_ALLOW_NCPAINT,
+            DWMWA_CAPTION_BUTTON_BOUNDS,
+            DWMWA_NONCLIENT_RTL_LAYOUT,
+            DWMWA_FORCE_ICONIC_REPRESENTATION,
+            DWMWA_FLIP3D_POLICY,
+            DWMWA_EXTENDED_FRAME_BOUNDS,
+            DWMWA_HAS_ICONIC_BITMAP,
+            DWMWA_DISALLOW_PEEK,
+            DWMWA_EXCLUDED_FROM_PEEK,
+            DWMWA_CLOAK,
+            DWMWA_CLOAKED,
+            DWMWA_FREEZE_REPRESENTATION,
+            DWMWA_PASSIVE_UPDATE_MODE,
+            DWMWA_USE_HOSTBACKDROPBRUSH,
+            DWMWA_USE_IMMERSIVE_DARK_MODE = 20,
+            DWMWA_WINDOW_CORNER_PREFERENCE = 33,
+            DWMWA_BORDER_COLOR,
+            DWMWA_CAPTION_COLOR,
+            DWMWA_TEXT_COLOR,
+            DWMWA_VISIBLE_FRAME_BORDER_THICKNESS,
+            DWMWA_SYSTEMBACKDROP_TYPE,
+            DWMWA_LAST
+        }
+
+        // The DWM_WINDOW_CORNER_PREFERENCE enum for DwmSetWindowAttribute's third parameter, which tells the function  
+        // what value of the enum to set.  
+        public enum DWM_WINDOW_CORNER_PREFERENCE
+        {
+            DWMWCP_DEFAULT = 0,
+            DWMWCP_DONOTROUND = 1,
+            DWMWCP_ROUND = 2,
+            DWMWCP_ROUNDSMALL = 3
+        }
+
+        // Import dwmapi.dll and define DwmSetWindowAttribute in C# corresponding to the native function.  
+        [DllImport("dwmapi.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+        private static extern long DwmSetWindowAttribute(IntPtr hwnd,
+            DWMWINDOWATTRIBUTE attribute,
+            ref uint pvAttribute,
+            uint cbAttribute);
         public ReconnectionNeeded()
         {
             InitializeComponent();
+            IntPtr hWnd = new WindowInteropHelper(GetWindow(this)).EnsureHandle();
+            var attribute = DWMWINDOWATTRIBUTE.DWMWA_WINDOW_CORNER_PREFERENCE;
+            uint preference = 2;
+            DwmSetWindowAttribute(hWnd, attribute, ref preference, sizeof(uint));
+
+            var attribute2 = DWMWINDOWATTRIBUTE.DWMWA_USE_IMMERSIVE_DARK_MODE;
+            uint colour = 1;
+            DwmSetWindowAttribute(hWnd, attribute2, ref colour, sizeof(uint));
         }
 
         private void Button_Click(object sender, RoutedEventArgs e)