Merge pull request #9254 from electron/endsession-event

End session event on browser window

atom/browser/api/atom_api_window.cc

@@ -191,6 +191,10 @@ void Window::OnWindowClosed() {
       FROM_HERE, GetDestroyClosure());
 }
 
+void Window::OnWindowEndSession() {
+  Emit("session-end");
+}
+
 void Window::OnWindowBlur() {
   Emit("blur");
 }

atom/browser/api/atom_api_window.h

@@ -63,6 +63,7 @@ class Window : public mate::TrackableObject<Window>,
   void WillCloseWindow(bool* prevent_default) override;
   void WillDestroyNativeObject() override;
   void OnWindowClosed() override;
+  void OnWindowEndSession() override;
   void OnWindowBlur() override;
   void OnWindowFocus() override;
   void OnWindowShow() override;

atom/browser/native_window.cc

@@ -474,6 +474,11 @@ void NativeWindow::NotifyWindowClosed() {
     observer.OnWindowClosed();
 }
 
+void NativeWindow::NotifyWindowEndSession() {
+  for (NativeWindowObserver& observer : observers_)
+    observer.OnWindowEndSession();
+}
+
 void NativeWindow::NotifyWindowBlur() {
   for (NativeWindowObserver& observer : observers_)
     observer.OnWindowBlur();

atom/browser/native_window.h

@@ -218,6 +218,7 @@ class NativeWindow : public base::SupportsUserData,
   // Public API used by platform-dependent delegates and observers to send UI
   // related notifications.
   void NotifyWindowClosed();
+  void NotifyWindowEndSession();
   void NotifyWindowBlur();
   void NotifyWindowFocus();
   void NotifyWindowShow();

atom/browser/native_window_observer.h

@@ -40,6 +40,9 @@ class NativeWindowObserver {
   // Called when the window is closed.
   virtual void OnWindowClosed() {}
 
+  // Called when Windows sends WM_ENDSESSION message
+  virtual void OnWindowEndSession() {}
+
   // Called when window loses focus.
   virtual void OnWindowBlur() {}
 

atom/browser/native_window_views_win.cc

@@ -147,6 +147,11 @@ bool NativeWindowViews::PreHandleMSG(
       }
       return false;
     }
+    case WM_ENDSESSION: {
+      if (w_param) {
+        NotifyWindowEndSession();
+      }
+    }
     default:
       return false;
   }

docs/api/browser-window.md

@@ -376,6 +376,11 @@ window.onbeforeunload = (e) => {
 Emitted when the window is closed. After you have received this event you should
 remove the reference to the window and avoid using it any more.
 
+#### Event: 'session-end' _Windows_
+
+Emitted when window session is going to end due to force shutdown or machine restart 
+or session log off.
+
 #### Event: 'unresponsive'
 
 Emitted when the web page becomes unresponsive.