Bug 1735458 - Do not show mail notification on Windows if running fullscreen app. r=mkmelin

Differential Revision: https://phabricator.services.mozilla.com/D128427

--HG--
extra : amend_source : db4b4e7c3baca7329e40eb02ac9918d1961baaf4

mailnews/base/public/nsIMessengerWindowsIntegration.idl

@@ -13,4 +13,7 @@ interface nsIMessengerWindowsIntegration : nsIMessengerOSIntegration {
   void hideWindow(in nsIBaseWindow aWindow);
 
   void showWindow(in mozIDOMWindowProxy aWindow);
+
+  /** Do not show notifications in some states, e.g. when running a fullscreen app. */
+  readonly attribute boolean suppressNotification;
 };

mailnews/base/src/MailNotificationManager.jsm

@@ -77,6 +77,7 @@ class MailNotificationManager {
     if (AppConstants.platform == "win") {
       Services.obs.addObserver(this, "windows-refresh-badge-tray");
       Services.prefs.addObserver("mail.biff.show_badge", this);
+      this._osIntegration.QueryInterface(Ci.nsIMessengerWindowsIntegration);
     }
   }
 
@@ -133,6 +134,12 @@ class MailNotificationManager {
     if (!Services.prefs.getBoolPref("mail.biff.show_alert")) {
       return;
     }
+    if (
+      AppConstants.platform == "win" &&
+      this._osIntegration.suppressNotification
+    ) {
+      return;
+    }
 
     this._logger.debug(
       `onFolderIntPropertyChanged; property=${property}: ${oldValue} => ${newValue}, folder.URI=${folder.URI}`
@@ -166,7 +173,7 @@ class MailNotificationManager {
   }
 
   /**
-   * Show an alert according the changed folder.
+   * Show an alert according to the changed folder.
    * @param {nsIMsgFolder} changedFolder - The folder that emitted the change
    *   event, can be a root folder or a real folder.
    */

mailnews/base/src/nsMessengerWinIntegration.cpp

@@ -226,6 +226,17 @@ nsMessengerWinIntegration::ShowWindow(mozIDOMWindowProxy* aWindow) {
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsMessengerWinIntegration::GetSuppressNotification(bool* suppressNotification) {
+  *suppressNotification = false;
+  QUERY_USER_NOTIFICATION_STATE qstate;
+  if (SUCCEEDED(SHQueryUserNotificationState(&qstate)) &&
+      qstate != QUNS_ACCEPTS_NOTIFICATIONS) {
+    *suppressNotification = true;
+  }
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsMessengerWinIntegration::UpdateUnreadCount(uint32_t unreadCount,
                                              const nsAString& unreadTooltip) {