Tray icon now respects current system theme

2021-02-07 16:24:20 +00:00
parent fbf7713705
commit 72941706d9
17 changed files with 213 additions and 93 deletions
@@ -0,0 +1,69 @@
+using NotificationFlyout.Wpf.UI.Extensions;
+using System;
+using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Interop;
+using Windows.UI.ViewManagement;
+
+namespace NotificationFlyout.Wpf.UI.Helpers
+{
+    public class SystemPersonalisationHelper
+    {
+        private readonly UISettings _settings = new();
+
+        private SystemTheme _currentTheme;
+
+
+        private SystemPersonalisationHelper(Window window)
+        {
+            var source = HwndSource.FromHwnd(window.GetHandle());
+            source.AddHook(new HwndSourceHook(WndProc));
+
+            _settings.ColorValuesChanged += OnColorValuesChanged;
+            _currentTheme = GetSystemTheme();
+        }
+
+        public event EventHandler<ThemeChangedEventArgs> ThemeChanged;
+
+        public SystemTheme SystemTheme => GetSystemTheme();
+
+        public static SystemPersonalisationHelper Create(Window window)
+        {
+            return new SystemPersonalisationHelper(window);
+        }
+
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern IntPtr DefWindowProcW(IntPtr handle, uint msg, IntPtr wParam, IntPtr lParam);
+
+        private SystemTheme GetSystemTheme()
+        {
+            var uiTheme = _settings.GetColorValue(UIColorType.Background).ToString();
+            return uiTheme == "#FFFFFFFF" ? SystemTheme.Light : SystemTheme.Dark;
+        }
+
+        private void OnColorValuesChanged(UISettings sender, object args)
+        {
+            RaiseThemeChangedEvent();
+        }
+
+        private void RaiseThemeChangedEvent()
+        {
+            var theme = GetSystemTheme();
+            if (theme != _currentTheme)
+            {
+                ThemeChanged?.Invoke(this, new ThemeChangedEventArgs(theme));
+                _currentTheme = theme;
+            }
+        }
+
+        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            if (msg == (int)WndProcMessages.WM_SETTINGCHANGE)
+            {
+                RaiseThemeChangedEvent();
+            }
+
+            return DefWindowProcW(hwnd, (uint)msg, wParam, (lParam));
+        }
+    }
+}