From 5c5f25cc615d608c1e81eb42bd266d0b684eaef6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A4=A9=E6=84=8FJily?= <jilysxz@outlook.com>
Date: Thu, 19 Mar 2026 00:07:18 +0800
Subject: [PATCH 1/2] Fixed the issue of the secondary screen's taskbar
 becoming transparent after restarting in mixed DPI multi-screen setups.

---
 .gitignore                         | 10 ++++++++++
 src/System/Program.cs              |  3 ++-
 src/UI/Helpers/TaskbarWinHelper.cs | 17 +++++++++++------
 src/UI/TaskbarForm.cs              |  8 +++++---
 4 files changed, 28 insertions(+), 10 deletions(-)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3cdf42a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,10 @@
+################################################################################
+# 此 .gitignore 文件已由 Microsoft(R) Visual Studio 自动创建。
+################################################################################
+
+/.dotnet_cli/.dotnet
+/.vs
+/bin/Debug/net8.0-windows
+/LiteMonitor.Updater/obj
+/obj
+/bin/Debug
diff --git a/src/System/Program.cs b/src/System/Program.cs
index 38eb757..38e9941 100644
--- a/src/System/Program.cs
+++ b/src/System/Program.cs
@@ -84,6 +84,7 @@ static void Main()
             try
             {
                 // ★★★ 3. 启动应用 ★★★
+                Application.SetHighDpiMode(HighDpiMode.PerMonitorV2);
                 ApplicationConfiguration.Initialize();
                 Application.Run(new MainForm());
             }
@@ -148,4 +149,4 @@ static void LogCrash(Exception? ex, string source)
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/UI/Helpers/TaskbarWinHelper.cs b/src/UI/Helpers/TaskbarWinHelper.cs
index 371fcf5..2903d49 100644
--- a/src/UI/Helpers/TaskbarWinHelper.cs
+++ b/src/UI/Helpers/TaskbarWinHelper.cs
@@ -215,7 +215,7 @@ private IntPtr FindSecondaryTaskbar(Screen screen)
                 if (screen.Bounds.Contains(r.Location) || screen.Bounds.IntersectsWith(r))
                     return hWnd;
             }
-            return FindWindow("Shell_TrayWnd", null);
+            return IntPtr.Zero;
         }
 
         public Rectangle GetTaskbarRect(IntPtr hTaskbar, string targetDevice)
@@ -264,7 +264,7 @@ public Rectangle GetTaskbarRect(IntPtr hTaskbar, string targetDevice)
 
                             if (!isVertical)
                             {
-                                int dpi = GetTaskbarDpi();
+                                int dpi = GetTaskbarDpi(hTaskbar);
                                 int standardHeight = (int)Math.Round(48.0 * dpi / 96.0);
 
                                 if (rectPhys.Height > (standardHeight * 0.8))
@@ -312,16 +312,21 @@ public static bool IsCenterAligned()
             catch { return false; }
         }
 
-        public static int GetTaskbarDpi()
+        public static int GetTaskbarDpi(IntPtr hWnd)
         {
-            IntPtr taskbar = FindWindow("Shell_TrayWnd", null);
-            if (taskbar != IntPtr.Zero)
+            if (hWnd != IntPtr.Zero)
             {
-                try { return (int)GetDpiForWindow(taskbar); } catch { }
+                try { return (int)GetDpiForWindow(hWnd); } catch { }
             }
             return 96;
         }
 
+        public static int GetTaskbarDpi()
+        {
+            IntPtr taskbar = FindWindow("Shell_TrayWnd", null);
+            return GetTaskbarDpi(taskbar);
+        }
+
         public static int GetWidgetsWidth()
         {
             int dpi = GetTaskbarDpi();
diff --git a/src/UI/TaskbarForm.cs b/src/UI/TaskbarForm.cs
index fa3972e..f39fbe4 100644
--- a/src/UI/TaskbarForm.cs
+++ b/src/UI/TaskbarForm.cs
@@ -57,12 +57,11 @@ public TaskbarForm(Settings cfg, UIController ui, MainForm mainForm)
             TopMost = false;
             DoubleBuffered = true;
 
-            ReloadLayout();
-
             _bizHelper.CheckTheme(true);
             _bizHelper.FindHandles();
             
             _bizHelper.AttachToTaskbar();
+            ReloadLayout();
             _winHelper.ApplyLayeredStyle(_bizHelper.TransparentKey, _cfg.TaskbarClickThrough);
 
             _timer.Interval = Math.Max(_cfg.RefreshMs, 60);
@@ -79,7 +78,10 @@ public void ReloadLayout()
         {
             _layout = new HorizontalLayout(ThemeManager.Current, 300, LayoutMode.Taskbar, _cfg);
             _lastLayoutSignature = ""; // 重置签名，强制重算
-            _winHelper.ApplyLayeredStyle(_bizHelper.TransparentKey, _cfg.TaskbarClickThrough);
+            if (IsHandleCreated)
+            {
+                _winHelper.ApplyLayeredStyle(_bizHelper.TransparentKey, _cfg.TaskbarClickThrough);
+            }
             _bizHelper.CheckTheme(true);
 
             // 更新悬浮窗模式 (支持热切换)

From 58cadb4c55bfe41a27c13d61ccf1f20e10ed6fb9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A4=A9=E6=84=8FJily?= <jilysxz@outlook.com>
Date: Thu, 19 Mar 2026 15:10:07 +0800
Subject: [PATCH 2/2] ignore

---
 .gitignore | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 3cdf42a..a3ffb03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,6 @@
 
 /.dotnet_cli/.dotnet
 /.vs
-/bin/Debug/net8.0-windows
-/LiteMonitor.Updater/obj
-/obj
-/bin/Debug
+/bin/*
+/obj/*
+/LiteMonitor.Updater/*
\ No newline at end of file