From 2d1226fefc2f21e504418a9e2b08f2d781562d15 Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Sun, 14 Sep 2014 00:13:19 +0200
Subject: [PATCH] refs #325, reduced loading in ATC stations component

---
 .../components/atcstationcomponent.cpp         | 18 ++++++++++++++++++
 src/blackgui/components/atcstationcomponent.h  |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/src/blackgui/components/atcstationcomponent.cpp b/src/blackgui/components/atcstationcomponent.cpp
index bb6ece28b..ca439a23b 100644
--- a/src/blackgui/components/atcstationcomponent.cpp
+++ b/src/blackgui/components/atcstationcomponent.cpp
@@ -55,6 +55,16 @@ namespace BlackGui
             delete ui;
         }
 
+        int CAtcStationComponent::countBookedStations() const
+        {
+            return ui->tvp_AtcStationsBooked->rowCount();
+        }
+
+        int CAtcStationComponent::countOnlineStations() const
+        {
+            return ui->tvp_AtcStationsOnline->rowCount();
+        }
+
         void CAtcStationComponent::runtimeHasBeenSet()
         {
             Q_ASSERT(this->getRuntime());
@@ -74,6 +84,14 @@ namespace BlackGui
             Q_ASSERT(this->ui->tvp_AtcStationsOnline);
             Q_ASSERT(this->getIContextNetwork());
 
+            // check if component is visible, if we have already data then skip udpate
+            bool hasData = this->countBookedStations() > 0 || this->countOnlineStations() > 0;
+            if (hasData && !this->isVisibleWidget())
+            {
+                qDebug() << this->objectName() << "Skipping update, not visible";
+                return;
+            }
+
             // bookings
             if (this->m_timestampBookedStationsChanged > this->m_timestampLastReadBookedStations)
             {
diff --git a/src/blackgui/components/atcstationcomponent.h b/src/blackgui/components/atcstationcomponent.h
index f09f13e83..800a2d6ad 100644
--- a/src/blackgui/components/atcstationcomponent.h
+++ b/src/blackgui/components/atcstationcomponent.h
@@ -47,6 +47,12 @@ namespace BlackGui
             //! Timer for updating
             CTimerBasedComponent *getTimerComponent() { return this->m_timerComponent; }
 
+            //! Number of booked stations
+            int countBookedStations() const;
+
+            //! Number of online stations
+            int countOnlineStations() const;
+
         public slots:
             //! Update stations
             void update();