Update the IPB beacons table only when the dialog is visible

plugins/feature/map/mapibpbeacondialog.cpp

@@ -32,7 +32,6 @@ MapIBPBeaconDialog::MapIBPBeaconDialog(MapGUI *gui, QWidget* parent) :
     ui->setupUi(this);
     connect(&m_timer, &QTimer::timeout, this, &MapIBPBeaconDialog::updateTime);
     m_timer.setInterval(1000);
-    m_timer.start();
     ui->beacons->setRowCount(IBPBeacon::m_frequencies.size());
     for (int row = 0; row < IBPBeacon::m_frequencies.size(); row++)
     {
@@ -44,7 +43,6 @@ MapIBPBeaconDialog::MapIBPBeaconDialog(MapGUI *gui, QWidget* parent) :
         ui->beacons->setItem(row, IBP_BEACON_COL_DISTANCE, new QTableWidgetItem(""));
     }
     resizeTable();
-    updateTable(QTime::currentTime());
 }
 
 MapIBPBeaconDialog::~MapIBPBeaconDialog()
@@ -126,3 +124,17 @@ void MapIBPBeaconDialog::updateTime()
         updateTable(t);
     }
 }
+
+void MapIBPBeaconDialog::showEvent(QShowEvent *event)
+{
+    (void) event;
+    updateTable(QTime::currentTime());
+    updateTime();
+    m_timer.start();
+}
+
+void MapIBPBeaconDialog::hideEvent(QHideEvent *event)
+{
+    (void) event;
+    m_timer.stop();
+}

plugins/feature/map/mapibpbeacondialog.h

@@ -43,6 +43,8 @@ private slots:
     void accept();
     void on_beacons_cellDoubleClicked(int row, int column);
     void updateTime();
+    void showEvent(QShowEvent *event);
+    void hideEvent(QHideEvent *event);
 
 private:
     MapGUI *m_gui;