From 5d3a6e62a1e7853e94dc5f9deefef6823f16314f Mon Sep 17 00:00:00 2001
From: Nguyen Duy <wuuyi123@gmail.com>
Date: Fri, 7 Jun 2024 07:37:23 +0700
Subject: [PATCH] app: fix offline display arrival

---
 app/MainWindow.xaml.cs | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/app/MainWindow.xaml.cs b/app/MainWindow.xaml.cs
index f9cac72..2709f2c 100644
--- a/app/MainWindow.xaml.cs
+++ b/app/MainWindow.xaml.cs
@@ -37,6 +37,10 @@ protected override void OnSourceInitialized(EventArgs e)
 
             Handle = new WindowInteropHelper(this).EnsureHandle();
             Helper.EnableDropShadow(Handle);
+
+            var source = HwndSource.FromHwnd(Handle);
+            source.AddHook(new HwndSourceHook(WndProc));
+
         }
 
         protected override void OnClosing(CancelEventArgs e)
@@ -98,14 +102,15 @@ private void Window_Unloaded(object sender, RoutedEventArgs e)
             SystemEvents.DisplaySettingsChanged -= DisplayChanged;
         }
 
-        private void DisplayChanged(object sender, EventArgs  e)
+        private void DisplayChanged(object sender, EventArgs e)
         {
             Dispatcher.Invoke(() =>
             {
                 var displays = ParsecVDD.GetDisplays(out bool noMonitors);
 
                 xDisplays.Children.Clear();
-                xNoDisplay.Visibility = displays.Count <= 0 ? Visibility.Visible : Visibility.Hidden;
+                xNoDisplay.Visibility = displays.Count > 0
+                    ? Visibility.Hidden : Visibility.Visible;
 
                 foreach (var display in displays)
                 {
@@ -206,5 +211,15 @@ private void Window_KeyDown(object sender, KeyEventArgs e)
                 }
             }
         }
+
+        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            if (msg == 0x0219 && unchecked((int)wParam) == 0x7)
+            {
+                DisplayChanged(this, EventArgs.Empty);
+            }
+
+            return IntPtr.Zero;
+        }
     }
 }
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