Pause notifications when Windows is on lock screen

windows/TweetDuck/Browser/Notification/FormNotificationTweet.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Drawing;
 using System.Windows.Forms;
+using TweetDuck.Management;
 using TweetDuck.Utils;
 using TweetLib.Browser.Interfaces;
 using TweetLib.Core.Features.Notifications;
@@ -40,13 +41,27 @@ protected override bool CanDragWindow {
 			InitializeComponent();
 
 			Config.MuteToggled += Config_MuteToggled;
-			Disposed += (sender, args) => Config.MuteToggled -= Config_MuteToggled;
+			WindowsSessionManager.LockStateChanged += WindowsSessionManager_LockStateChanged;
+			
+			Disposed += (sender, args) => {
+				Config.MuteToggled -= Config_MuteToggled;
+				WindowsSessionManager.LockStateChanged -= WindowsSessionManager_LockStateChanged;
+			};
 
 			if (Config.MuteNotifications) {
 				PauseNotification(NotificationPauseReason.UserConfiguration);
 			}
 		}
 
+		private void WindowsSessionManager_LockStateChanged(object sender, EventArgs e) {
+			if (WindowsSessionManager.IsLocked) {
+				PauseNotification(NotificationPauseReason.WindowsSessionLocked);
+			}
+			else {
+				ResumeNotification(NotificationPauseReason.WindowsSessionLocked);
+			}
+		}
+
 		protected override void WndProc(ref Message m) {
 			if (m.Msg == 0x00A7) { // WM_NCMBUTTONDOWN
 				int hitTest = m.WParam.ToInt32();

windows/TweetDuck/Management/WindowsSessionManager.cs

@@ -0,0 +1,34 @@
+using System;
+using Microsoft.Win32;
+using Win = System.Windows.Forms;
+
+namespace TweetDuck.Management {
+	static class WindowsSessionManager {
+		public static bool IsLocked { get; private set; } = false;
+		public static event EventHandler LockStateChanged;
+
+		public static void Register() {
+			Win.Application.ApplicationExit += OnApplicationExit;
+			SystemEvents.SessionSwitch += OnSessionSwitch;
+		}
+
+		private static void OnApplicationExit(object sender, EventArgs e) {
+			SystemEvents.SessionSwitch -= OnSessionSwitch;
+		}
+
+		private static void OnSessionSwitch(object sender, SessionSwitchEventArgs e) {
+			var reason = e.Reason;
+			if (reason == SessionSwitchReason.SessionLock) {
+				SetLocked(true);
+			}
+			else if (reason == SessionSwitchReason.SessionUnlock) {
+				SetLocked(false);
+			}
+		}
+
+		private static void SetLocked(bool newState) {
+			IsLocked = newState;
+			LockStateChanged?.Invoke(null, EventArgs.Empty);
+		}
+	}
+}

windows/TweetDuck/Program.cs

@@ -50,6 +50,7 @@ internal static void SetupWinForms() {
 		[STAThread]
 		private static void Main() {
 			AppDomain.CurrentDomain.UnhandledException += OnUnhandledException;
+			WindowsSessionManager.Register();
 
 			SetupWinForms();
 			Cef.EnableHighDPISupport();

windows/TweetDuck/TweetDuck.csproj

@@ -141,6 +141,7 @@
     <Compile Include="Management\LockManager.cs" />
     <Compile Include="Management\ProfileManager.cs" />
     <Compile Include="Management\VideoPlayer.cs" />
+    <Compile Include="Management\WindowsSessionManager.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Reporter.cs" />