Add support for tuning on/off live updating

src/FactSystem/FactGroup.cc

@@ -46,7 +46,8 @@ void FactGroup::_setupTimer()
     if (_updateRateMSecs > 0) {
         connect(&_updateTimer, &QTimer::timeout, this, &FactGroup::_updateAllValues);
         _updateTimer.setSingleShot(false);
-        _updateTimer.start(_updateRateMSecs);
+        _updateTimer.setInterval(_updateRateMSecs);
+        _updateTimer.start();
     }
 }
 
@@ -125,3 +126,19 @@ void FactGroup::_updateAllValues(void)
         fact->sendDeferredValueChangedSignal();
     }
 }
+
+void FactGroup::setLiveUpdates(bool liveUpdates)
+{
+    if (_updateTimer.interval() == 0) {
+        return;
+    }
+
+    if (liveUpdates) {
+        _updateTimer.stop();
+    } else {
+        _updateTimer.start();
+    }
+    for(Fact* fact: _nameToFactMap) {
+        fact->setSendValueChangedSignals(liveUpdates);
+    }
+}

src/FactSystem/FactGroup.h

@@ -38,6 +38,9 @@ public:
     /// @return FactGroup for specified name, NULL if not found
     Q_INVOKABLE FactGroup* getFactGroup(const QString& name);
 
+    /// Turning on live updates will allow value changes to flow through as they are received.
+    Q_INVOKABLE void setLiveUpdates(bool liveUpdates);
+
     QStringList factNames(void) const { return _factNames; }
     QStringList factGroupNames(void) const { return _nameToFactGroupMap.keys(); }