Handle WndProc power broadcast messages

Author: t1m0thyj

src/EventScheduler.cs

@@ -37,6 +37,7 @@ class EventScheduler
         public EventScheduler()
         {
             fullScreenChecker = new FullScreenApi(() => HandleTimerEvent(true));
+            HiddenForm.OnPowerModeChanged = OnPowerModeChanged;
 
             backgroundTimer.AutoReset = true;
             backgroundTimer.Interval = 60e3;
@@ -268,7 +269,7 @@ private void OnDisplaySettingsChanged(object sender, EventArgs e)
 
         private void OnPowerModeChanged(object sender, PowerModeChangedEventArgs e)
         {
-            if (e.Mode == PowerModes.Resume && (UpdateDisplayList() ||
+            if ((e == null || e.Mode == PowerModes.Resume) && (UpdateDisplayList() ||
                 (nextUpdateTime.HasValue && DateTime.Now >= nextUpdateTime.Value)))
             {
                 LoggingHandler.LogMessage("Scheduler event triggered by resume from sleep");

src/HiddenForm.cs

@@ -14,7 +14,12 @@ internal class HiddenForm : Form
         private const int ENDSESSION_CLOSEAPP = 0x1;
         private const int WM_QUERYENDSESSION = 0x11;
         private const int WM_ENDSESSION = 0x16;
+        private const int WM_POWERBROADCAST = 0x0218;
+        private const int PBT_APMRESUMESUSPEND = 0x0007;
+        private const int PBT_APMRESUMEAUTOMATIC = 0x0012;
 
+        public static Microsoft.Win32.PowerModeChangedEventHandler OnPowerModeChanged;
+        
         [DllImport("user32.dll")]
         private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hwndNewParent);
 
@@ -59,6 +64,13 @@ protected override void WndProc(ref Message m)
                     }
                     m.Result = IntPtr.Zero;
                     break;
+                case WM_POWERBROADCAST:
+                    int pbt = m.WParam.ToInt32();
+                    if (pbt == PBT_APMRESUMEAUTOMATIC || pbt == PBT_APMRESUMESUSPEND)
+                    {
+                        OnPowerModeChanged(null, null);
+                    }
+                    break;
             }
 
             base.WndProc(ref m);