Bug 699014 - Toolkit alerts shouldn't be displayed if the user's in a fullscreen app, presentation mode, or in Windows 8 immersive mode. r=bbondy, ui-r=limi

toolkit/components/alerts/nsAlertsService.cpp

@@ -74,6 +74,33 @@ nsAlertsService::nsAlertsService()
 nsAlertsService::~nsAlertsService()
 {}
 
+bool nsAlertsService::ShouldShowAlert()
+{
+  bool result = true;
+
+#ifdef XP_WIN
+  HMODULE shellDLL = ::LoadLibraryW(L"shell32.dll");
+  if (!shellDLL)
+    return result;
+
+  SHQueryUserNotificationStatePtr pSHQueryUserNotificationState =
+    (SHQueryUserNotificationStatePtr) ::GetProcAddress(shellDLL, "SHQueryUserNotificationState");
+
+  if (pSHQueryUserNotificationState) {
+    MOZ_QUERY_USER_NOTIFICATION_STATE qstate;
+    if (SUCCEEDED(pSHQueryUserNotificationState(&qstate))) {
+      if (qstate != QUNS_ACCEPTS_NOTIFICATIONS) {
+         result = false;
+      }
+    }
+  }
+
+  ::FreeLibrary(shellDLL);
+#endif
+
+  return result;
+}
+
 NS_IMETHODIMP nsAlertsService::ShowAlertNotification(const nsAString & aImageUrl, const nsAString & aAlertTitle, 
                                                      const nsAString & aAlertText, bool aAlertTextClickable,
                                                      const nsAString & aAlertCookie,
@@ -110,6 +137,13 @@ NS_IMETHODIMP nsAlertsService::ShowAlertNotification(const nsAString & aImageUrl
       return rv;
   }
 
+  if (!ShouldShowAlert()) {
+    // Do not display the alert. Instead call alertfinished and get out.
+    if (aAlertListener)
+      aAlertListener->Observe(NULL, "alertfinished", PromiseFlatString(aAlertCookie).get());
+    return NS_OK;
+  }
+
   nsCOMPtr<nsIWindowWatcher> wwatch(do_GetService(NS_WINDOWWATCHER_CONTRACTID));
   nsCOMPtr<nsIDOMWindow> newWindow;
 

toolkit/components/alerts/nsAlertsService.h

@@ -42,6 +42,23 @@
 #include "nsIAlertsService.h"
 #include "nsCOMPtr.h"
 
+#ifdef XP_WIN
+typedef enum tagMOZ_QUERY_USER_NOTIFICATION_STATE {
+    QUNS_NOT_PRESENT = 1,
+    QUNS_BUSY = 2,
+    QUNS_RUNNING_D3D_FULL_SCREEN = 3,
+    QUNS_PRESENTATION_MODE = 4,
+    QUNS_ACCEPTS_NOTIFICATIONS = 5,
+    QUNS_QUIET_TIME = 6,
+    QUNS_IMMERSIVE = 7
+} MOZ_QUERY_USER_NOTIFICATION_STATE;
+
+extern "C" {
+// This function is Windows Vista or later
+typedef HRESULT (__stdcall *SHQueryUserNotificationStatePtr)(MOZ_QUERY_USER_NOTIFICATION_STATE *pquns);
+}
+#endif // defined(XP_WIN)
+
 class nsAlertsService : public nsIAlertsService,
                         public nsIAlertsProgressListener
 {
@@ -54,6 +71,7 @@ public:
   virtual ~nsAlertsService();
 
 protected:
+  bool ShouldShowAlert();
 };
 
 #endif /* nsAlertsService_h__ */

toolkit/components/alerts/nsIAlertsService.idl

@@ -70,6 +70,11 @@ interface nsIAlertsService : nsISupports
     *   topic   - "alertfinished" when the alert goes away
     *             "alertclickcallback" when the text is clicked
     *   data    - the value of the cookie parameter passed to showAlertNotification.
+    *
+    * @note Depending on current circumstances (if the user's in a fullscreen
+    *       application, for instance), the alert might not be displayed at all.
+    *       In that case, if an alert listener is passed in it will receive the
+    *       "alertfinished" notification immediately.
     */
    void showAlertNotification(in AString  imageUrl, 
                               in AString  title,