From 5b2b272f7665993a03dc58264b513136008f9736 Mon Sep 17 00:00:00 2001
From: Jack251970 <1160210343@qq.com>
Date: Sat, 5 Jul 2025 13:35:02 +0800
Subject: [PATCH] Add ActualApplicationThemeChanged in MainViewModel

---
 Flow.Launcher.Plugin/EventHandler.cs     | 20 +++++++++++++++++++-
 Flow.Launcher/ViewModel/MainViewModel.cs | 15 +++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/Flow.Launcher.Plugin/EventHandler.cs b/Flow.Launcher.Plugin/EventHandler.cs
index 893b0ba80..47ab24757 100644
--- a/Flow.Launcher.Plugin/EventHandler.cs
+++ b/Flow.Launcher.Plugin/EventHandler.cs
@@ -39,7 +39,14 @@ namespace Flow.Launcher.Plugin
     /// <param name="sender"></param>
     /// <param name="args"></param>
     public delegate void VisibilityChangedEventHandler(object sender, VisibilityChangedEventArgs args);
-    
+
+    /// <summary>
+    /// A delegate for when the actual application theme is changed
+    /// </summary>
+    /// <param name="sender"></param>
+    /// <param name="args"></param>
+    public delegate void ActualApplicationThemeChangedEventHandler(object sender, ActualApplicationThemeChangedEventArgs args);
+
     /// <summary>
     /// The event args for <see cref="VisibilityChangedEventHandler"/>
     /// </summary>
@@ -77,4 +84,15 @@ namespace Flow.Launcher.Plugin
         /// </summary>
         public Query Query { get; set; }
     }
+
+    /// <summary>
+    /// The event args for <see cref="ActualApplicationThemeChangedEventHandler"/>
+    /// </summary>
+    public class ActualApplicationThemeChangedEventArgs : EventArgs
+    {
+        /// <summary>
+        /// <see langword="true"/> if the application has changed actual theme
+        /// </summary>
+        public bool IsDark { get; init; }
+    }
 }
diff --git a/Flow.Launcher/ViewModel/MainViewModel.cs b/Flow.Launcher/ViewModel/MainViewModel.cs
index 64a39fa62..49f7ea6c5 100644
--- a/Flow.Launcher/ViewModel/MainViewModel.cs
+++ b/Flow.Launcher/ViewModel/MainViewModel.cs
@@ -22,6 +22,7 @@ using Flow.Launcher.Plugin;
 using Flow.Launcher.Plugin.SharedCommands;
 using Flow.Launcher.Storage;
 using Microsoft.VisualStudio.Threading;
+using ModernWpf;
 
 namespace Flow.Launcher.ViewModel
 {
@@ -195,6 +196,18 @@ namespace Flow.Launcher.ViewModel
 
             RegisterViewUpdate();
             _ = RegisterClockAndDateUpdateAsync();
+
+            ThemeManager.Current.ActualApplicationThemeChanged += ThemeManager_ActualApplicationThemeChanged;
+        }
+
+        private void ThemeManager_ActualApplicationThemeChanged(ThemeManager sender, object args)
+        {
+            ActualApplicationThemeChanged?.Invoke(
+                Application.Current,
+                new ActualApplicationThemeChangedEventArgs()
+                {
+                    IsDark = sender.ActualApplicationTheme == ApplicationTheme.Dark
+                });
         }
 
         private void RegisterViewUpdate()
@@ -821,6 +834,7 @@ namespace Flow.Launcher.ViewModel
         public bool MainWindowVisibilityStatus { get; set; } = true;
 
         public event VisibilityChangedEventHandler VisibilityChanged;
+        public event ActualApplicationThemeChangedEventHandler ActualApplicationThemeChanged;
 
         public Visibility ClockPanelVisibility { get; set; }
         public Visibility SearchIconVisibility { get; set; }
@@ -1975,6 +1989,7 @@ namespace Flow.Launcher.ViewModel
                     {
                         _resultsViewUpdateTask.Dispose();
                     }
+                    ThemeManager.Current.ActualApplicationThemeChanged -= ThemeManager_ActualApplicationThemeChanged;
                     _disposed = true;
                 }
             }