Use Mica for prettier dark theme

src/AboutDialog.cs

@@ -20,7 +20,7 @@ public partial class AboutDialog : Form
         public AboutDialog()
         {
             InitializeComponent();
-            DarkUI.ThemeForm(this);
+            AcrylicUI.ThemeForm(this);
             Localization.TranslateForm(this);
         }
 

src/AcrylicUI.cs

@@ -0,0 +1,85 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+using Dark.Net;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace WinDynamicDesktop
+{
+    internal class AcrylicUI
+    {
+        public static bool IsDark
+        {
+            get { return IsSupported && DarkNet.Instance.UserDefaultAppThemeIsDark; }
+        }
+
+        public static void ThemeForm(Form form, bool onInit = true)
+        {
+            if (!IsSupported)
+            {
+                return;
+            }
+
+            COM.WinBlur.BlurType blurType = IsDark ? COM.WinBlur.BlurType.Mica : COM.WinBlur.BlurType.None;
+            COM.WinBlur.SetBlurStyle(form, blurType, COM.WinBlur.Mode.DarkMode);
+            form.ForeColor = IsDark ? Color.White : Control.DefaultForeColor;
+
+            foreach (Control childControl in GetControls(form))
+            {
+                COM.WinBlur.SetBlurStyle(childControl, blurType, COM.WinBlur.Mode.DarkMode);
+                childControl.ForeColor = IsDark ? Color.White : Control.DefaultForeColor;
+
+                if (childControl is LinkLabel)
+                {
+                    ((LinkLabel)childControl).LinkColor = IsDark ? Color.LightBlue : Color.Blue;
+                }
+
+                if (onInit)
+                {
+                    childControl.Paint += (object sender, PaintEventArgs e) =>
+                    {
+                        if (!childControl.Enabled)
+                        {
+                            TextRenderer.DrawText(e.Graphics, childControl.Text, childControl.Font,
+                                childControl.ClientRectangle, Color.Gray);
+                        }
+                    };
+                }
+            }
+        }
+
+        public static void UserDefaultAppThemeIsDarkChanged(object sender, bool isDark)
+        {
+            AppContext.notifyIcon.ContextMenuStrip.BeginInvoke(() =>
+            {
+                foreach (Form form in Application.OpenForms)
+                {
+                    ThemeForm(form, false);
+                }
+            });
+        }
+
+        // Code from https://stackoverflow.com/a/664083/5504760
+        internal static IEnumerable<Control> GetControls(Control form)
+        {
+            foreach (Control childControl in form.Controls)
+            {
+                foreach (Control grandChild in GetControls(childControl))
+                {
+                    yield return grandChild;
+                }
+
+                yield return childControl;
+            }
+        }
+
+        private static bool IsSupported
+        {
+            get { return Environment.OSVersion.Version.Major >= 10 && Environment.OSVersion.Version.Build >= 22000; }
+        }
+    }
+}

src/AppContext.cs

@@ -63,7 +63,7 @@ private void HandleMultiInstance()
         private void InitializeTrayIcon()
         {
             Application.ApplicationExit += OnApplicationExit;
-            Dark.Net.DarkNet.Instance.UserDefaultAppThemeIsDarkChanged += DarkUI.UserDefaultAppThemeIsDarkChanged;
+            Dark.Net.DarkNet.Instance.UserDefaultAppThemeIsDarkChanged += AcrylicUI.UserDefaultAppThemeIsDarkChanged;
 
             notifyIcon = new NotifyIcon
             {

src/COM/WinBlur.cs

@@ -0,0 +1,108 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+using System;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace WinDynamicDesktop.COM
+{
+    // https://github.com/Pronner/WinBlur/blob/70384557eab3fb00a83360de24a18a620f086cfa/src/WinBlur/PInvoke.cs
+    public class WinBlur
+    {
+        public class ParameterTypes
+        {
+            [Flags]
+            public enum DWMWINDOWATTRIBUTE
+            {
+                DWMWA_USE_IMMERSIVE_DARK_MODE = 20,
+                DWMWA_SYSTEMBACKDROP_TYPE = 38
+            }
+
+            public struct MARGINS
+            {
+                public int cxLeftWidth;
+
+                public int cxRightWidth;
+
+                public int cyTopHeight;
+
+                public int cyBottomHeight;
+            }
+        }
+
+        public class Methods
+        {
+            [DllImport("DwmApi.dll")]
+            public static extern int DwmExtendFrameIntoClientArea(IntPtr hwnd, ref ParameterTypes.MARGINS pMarInset);
+
+            [DllImport("dwmapi.dll")]
+            public static extern int DwmSetWindowAttribute(IntPtr hwnd, ParameterTypes.DWMWINDOWATTRIBUTE dwAttribute, ref int pvAttribute, int cbAttribute);
+
+            public static int ExtendFrame(IntPtr hwnd, ParameterTypes.MARGINS margins)
+            {
+                return DwmExtendFrameIntoClientArea(hwnd, ref margins);
+            }
+
+            public static int SetWindowAttribute(IntPtr hwnd, ParameterTypes.DWMWINDOWATTRIBUTE attribute, int parameter)
+            {
+                return DwmSetWindowAttribute(hwnd, attribute, ref parameter, Marshal.SizeOf<int>());
+            }
+        }
+
+        public static void SetBlurStyle(Control cntrl, BlurType blurType, Mode designMode)
+        {
+            ParameterTypes.MARGINS bounds = default(ParameterTypes.MARGINS);
+            IntPtr hwnd = cntrl.Handle;
+            bounds.cxLeftWidth = 0;
+            bounds.cxRightWidth = 0;
+            checked
+            {
+                bounds.cyTopHeight = cntrl.Height + 10000000;
+                bounds.cyBottomHeight = 0;
+                int result = Methods.DwmExtendFrameIntoClientArea(hwnd, ref bounds);
+                cntrl.BackColor = blurType != BlurType.None ? System.Drawing.Color.Black : Control.DefaultBackColor;
+            }
+
+            if (blurType == BlurType.None)
+            {
+                Methods.SetWindowAttribute(cntrl.Handle, ParameterTypes.DWMWINDOWATTRIBUTE.DWMWA_SYSTEMBACKDROP_TYPE, 1);
+            }
+            if (blurType == BlurType.Mica)
+            {
+                Methods.SetWindowAttribute(cntrl.Handle, ParameterTypes.DWMWINDOWATTRIBUTE.DWMWA_SYSTEMBACKDROP_TYPE, 2);
+            }
+            if (blurType == BlurType.Acrylic)
+            {
+                Methods.SetWindowAttribute(cntrl.Handle, ParameterTypes.DWMWINDOWATTRIBUTE.DWMWA_SYSTEMBACKDROP_TYPE, 3);
+            }
+            if (blurType == BlurType.Tabbed)
+            {
+                Methods.SetWindowAttribute(cntrl.Handle, ParameterTypes.DWMWINDOWATTRIBUTE.DWMWA_SYSTEMBACKDROP_TYPE, 4);
+            }
+            if (designMode == Mode.LightMode)
+            {
+                Methods.SetWindowAttribute(cntrl.Handle, ParameterTypes.DWMWINDOWATTRIBUTE.DWMWA_USE_IMMERSIVE_DARK_MODE, 0);
+            }
+            if (designMode == Mode.DarkMode)
+            {
+                Methods.SetWindowAttribute(cntrl.Handle, ParameterTypes.DWMWINDOWATTRIBUTE.DWMWA_USE_IMMERSIVE_DARK_MODE, 1);
+            }
+        }
+
+        public enum BlurType
+        {
+            None,
+            Acrylic,
+            Mica,
+            Tabbed
+        }
+
+        public enum Mode
+        {
+            LightMode,
+            DarkMode
+        }
+    }
+}

src/DownloadDialog.cs

@@ -34,7 +34,7 @@ public partial class DownloadDialog : Form
         public DownloadDialog()
         {
             InitializeComponent();
-            DarkUI.ThemeForm(this);
+            AcrylicUI.ThemeForm(this);
             Localization.TranslateForm(this);
 
             this.FormClosing += OnFormClosing;