Fix notification queue and add gem action (#4985) (#5024)

Signed-off-by: AMZN-alexpete <26804013+AMZN-alexpete@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/UI/Notifications/ToastNotificationsView.cpp

@@ -63,6 +63,12 @@ namespace AzToolsFramework
 
     ToastId ToastNotificationsView::ShowToastNotification(const AzQtComponents::ToastConfiguration& toastConfiguration)
     {
+        // reject duplicate messages
+        if (m_rejectDuplicates && DuplicateNotificationInQueue(toastConfiguration))
+        {
+            return ToastId();
+        }
+
         ToastId toastId = CreateToastNotification(toastConfiguration); 
         m_queuedNotifications.emplace_back(toastId);
 
@@ -70,10 +76,28 @@ namespace AzToolsFramework
         {
             DisplayQueuedNotification();
         }
+        else if (m_queuedNotifications.size() >= m_maxQueuedNotifications)
+        {
+            // hiding the active toast will cause the next toast to be displayed
+            HideToastNotification(m_activeNotification);
+        }
 
         return toastId;
     }
 
+    bool ToastNotificationsView::DuplicateNotificationInQueue(const AzQtComponents::ToastConfiguration& toastConfiguration)
+    {
+        for (auto iter : m_notifications)
+        {
+            if (iter.second && iter.second->IsDuplicate(toastConfiguration))
+            {
+                return true; 
+            }
+        }
+
+        return false;
+    }
+
     ToastId ToastNotificationsView::ShowToastAtCursor(const AzQtComponents::ToastConfiguration& toastConfiguration)
     {
         ToastId toastId = CreateToastNotification(toastConfiguration); 
@@ -187,4 +211,14 @@ namespace AzToolsFramework
     {
         m_anchorPoint = anchorPoint;
     }
+
+    void ToastNotificationsView::SetMaxQueuedNotifications(AZ::u32 maxQueuedNotifications)
+    {
+        m_maxQueuedNotifications = maxQueuedNotifications;
+    }
+
+    void ToastNotificationsView::SetRejectDuplicates(bool rejectDuplicates)
+    {
+        m_rejectDuplicates = rejectDuplicates;
+    }
 }

Code/Framework/AzToolsFramework/AzToolsFramework/UI/Notifications/ToastNotificationsView.h

@@ -52,10 +52,13 @@ namespace AzToolsFramework
 
         void SetOffset(const QPoint& offset);
         void SetAnchorPoint(const QPointF& anchorPoint);
+        void SetMaxQueuedNotifications(AZ::u32 maxQueuedNotifications);
+        void SetRejectDuplicates(bool rejectDuplicates);
 
     private:
         ToastId CreateToastNotification(const AzQtComponents::ToastConfiguration& toastConfiguration);
         void DisplayQueuedNotification();
+        bool DuplicateNotificationInQueue(const AzQtComponents::ToastConfiguration& toastConfiguration);
         QPoint GetGlobalPoint();
 
         ToastId m_activeNotification;
@@ -64,5 +67,7 @@ namespace AzToolsFramework
 
         QPoint m_offset = QPoint(10, 10);
         QPointF m_anchorPoint = QPointF(1, 0);
+        AZ::u32 m_maxQueuedNotifications = 5;
+        bool m_rejectDuplicates = true;
     };
 } // AzToolsFramework