Add ThemeChanged event to IPluginData

src/DesktopMagic/BuiltInPlugins/DatePlugin.cs

@@ -13,22 +13,28 @@ internal class DatePlugin : Plugin
     private readonly CheckBox shortDateCheckBox = new CheckBox(true);
 
     private DateTime oldDateTime = DateTime.MinValue;
-    private Color oldColor = Color.White;
-    private string oldFont = string.Empty;
-    private bool oldShortDateCheckBoxValue;
+    private bool themeChanged = false;
+
     public override int UpdateInterval => 1000;
 
+    public override void Start()
+    {
+        Application.ThemeChanged += (_, _) =>
+        {
+            themeChanged = true;
+            Application.UpdateWindow();
+            themeChanged = false;
+        };
+    }
+
     public override Bitmap? Main()
     {
-        if (oldDateTime.Date == DateTime.Now.Date && oldColor == Application.Theme.PrimaryColor && oldFont == Application.Theme.Font && oldShortDateCheckBoxValue == shortDateCheckBox.Value)
+        if (oldDateTime.Date == DateTime.Now.Date && !themeChanged)
         {
             return null;
         }
 
         oldDateTime = DateTime.Now;
-        oldColor = Application.Theme.PrimaryColor;
-        oldFont = Application.Theme.Font;
-        oldShortDateCheckBoxValue = shortDateCheckBox.Value;
 
         string date = shortDateCheckBox.Value ? DateTime.Now.ToShortDateString() : DateTime.Now.ToLongDateString();
 

src/DesktopMagic/BuiltInPlugins/TimePlugin.cs

@@ -13,24 +13,32 @@ internal class TimePlugin : Plugin
     private readonly CheckBox displaySecondsCheckBox = new CheckBox(true);
 
     private string oldTime = string.Empty;
-    private Color oldColor = Color.White;
-    private string oldFont = string.Empty;
-    private bool oldDisplaySecondsCheckBoxValue;
+    private bool themeChanged;
     public override int UpdateInterval => 1000;
 
+    public override void Start()
+    {
+        Application.ThemeChanged += (_, _) => ThemeChanged();
+        displaySecondsCheckBox.OnValueChanged += ThemeChanged;
+
+        void ThemeChanged()
+        {
+            themeChanged = true;
+            Application.UpdateWindow();
+            themeChanged = false;
+        }
+    }
+
     public override Bitmap? Main()
     {
         string time = displaySecondsCheckBox.Value ? DateTime.Now.ToLongTimeString() : DateTime.Now.ToShortTimeString();
 
-        if (oldTime == time && oldColor == Application.Theme.PrimaryColor && oldFont == Application.Theme.Font && oldDisplaySecondsCheckBoxValue == displaySecondsCheckBox.Value)
+        if (oldTime == time && !themeChanged)
         {
             return null;
         }
 
         oldTime = time;
-        oldColor = Application.Theme.PrimaryColor;
-        oldFont = Application.Theme.Font;
-        oldDisplaySecondsCheckBoxValue = displaySecondsCheckBox.Value;
 
         Font font = new Font(Application.Theme.Font, 200);
 

src/DesktopMagic/Plugins/PluginData.cs

@@ -1,6 +1,7 @@
 using DesktopMagic.Api;
 using DesktopMagic.Settings;
 
+using System;
 using System.Drawing;
 
 namespace DesktopMagic.Plugins;
@@ -9,6 +10,8 @@ internal class PluginData(PluginWindow window, PluginSettings pluginSettings) :
 {
     private readonly PluginWindow window = window;
 
+    public event EventHandler? ThemeChanged;
+
     public ITheme Theme => pluginSettings.Theme;
 
     public Size WindowSize => new Size((int)window.ActualWidth, (int)window.ActualHeight);
@@ -23,4 +26,9 @@ internal class PluginData(PluginWindow window, PluginSettings pluginSettings) :
     {
         window.UpdatePluginWindow();
     }
+
+    internal void NotifyThemeChanged()
+    {
+        ThemeChanged?.Invoke(this, EventArgs.Empty);
+    }
 }

src/DesktopMagic/Plugins/PluginWindow.xaml.cs

@@ -104,7 +104,6 @@ public partial class PluginWindow : Window, IPluginWindow
 
     public void UpdatePluginWindow()
     {
-        Dispatcher.Invoke(ThemeChanged);
         UpdateTimer_Elapsed(updateTimer, null);
     }
 
@@ -209,6 +208,8 @@ public partial class PluginWindow : Window, IPluginWindow
         viewBox.Margin = new Thickness(settings.Theme.Margin);
         border.Background = new SolidColorBrush(MultiColorConverter.ConvertToMediaColor(settings.Theme.BackgroundColor));
         border.CornerRadius = new CornerRadius(settings.Theme.CornerRadius);
+
+        (pluginClassInstance?.Application as PluginData)?.NotifyThemeChanged();
     }
 
     private void ExecuteSource()
@@ -267,6 +268,7 @@ public partial class PluginWindow : Window, IPluginWindow
 
         pluginClassInstance.Start();
         UpdatePluginWindow();
+        Dispatcher.Invoke(ThemeChanged);
 
         if (pluginClassInstance.UpdateInterval > 0)
         {

src/DesktopMagicPluginAPI/IPluginData.cs

@@ -1,4 +1,5 @@
-using System.Drawing;
+using System;
+using System.Drawing;
 
 namespace DesktopMagic.Api;
 
@@ -7,6 +8,14 @@ namespace DesktopMagic.Api;
 /// </summary>
 public interface IPluginData
 {
+    /// <summary>
+    /// Occurs when the application's theme has changed.
+    /// </summary>
+    /// <remarks>Subscribe to this event to be notified when the theme changes, allowing UI elements or
+    /// components to update their appearance accordingly. The event is raised after the theme change has been
+    /// applied.</remarks>
+    event EventHandler? ThemeChanged;
+
     /// <summary>
     /// Gets the current theme setting of the main application.
     /// </summary>