add context menu to refresh a single param

src/ui/QGCBaseParamWidget.cc

@@ -95,6 +95,11 @@ void QGCBaseParamWidget::requestOnboardParamsUpdate()
     paramMgr->requestParameterList();
 }
 
+void QGCBaseParamWidget::requestOnboardParamUpdate(QString parameterName)
+{
+    paramMgr->requestParameterUpdate(paramMgr->getDefaultComponentId(), parameterName);
+}
+
 
 void QGCBaseParamWidget::saveParametersToFile()
 {

src/ui/QGCBaseParamWidget.h

@@ -43,6 +43,9 @@ public slots:
     /** @brief Request list of parameters from MAV */
     virtual void requestOnboardParamsUpdate();
 
+    /** @brief Request single parameter from MAV */
+    virtual void requestOnboardParamUpdate(QString parameterName);
+
 
     /** @brief Store parameters to a file */
     virtual void saveParametersToFile();

src/ui/QGCParamTreeWidget.cpp

@@ -60,9 +60,19 @@ void QGCParamTreeWidget::showContextMenu(const QPoint &pos)
         return;
     }
 
-
     QString param_id = item->data(0, Qt::DisplayRole).toString();
-    QAction* act = new QAction(tr("Map Parameter to RC"), this);
+
+    // Refresh single parameter
+    QAction* act = new QAction(tr("Refresh this param"), this);
+    act->setProperty("action", "refresh");
+    act->setProperty("param_id", param_id);
+    connect(act, &QAction::triggered, this,
+            &QGCParamTreeWidget::contextMenuAction);
+    menu.addAction(act);
+
+    // RC to parameter mapping
+    act = new QAction(tr("Map Parameter to RC"), this);
+    act->setProperty("action", "maprc");
     act->setProperty("param_id", param_id);
     connect(act, &QAction::triggered, this,
             &QGCParamTreeWidget::contextMenuAction);
@@ -71,7 +81,16 @@ void QGCParamTreeWidget::showContextMenu(const QPoint &pos)
 }
 
 void QGCParamTreeWidget::contextMenuAction() {
+    QString action = qobject_cast<QAction*>(
+            sender())->property("action").toString();
     QString param_id = qobject_cast<QAction*>(
             sender())->property("param_id").toString();
+
+    if (action == "refresh") {
+        emit refreshParamRequest(param_id);
+    } else if (action == "maprc") {
         emit mapRCToParamRequest(param_id);
+    } else {
+        qDebug() << "Undefined context menu action";
+    }
 }

src/ui/QGCParamTreeWidget.h

@@ -40,6 +40,7 @@ public:
 
 signals:
     void mapRCToParamRequest(QString param_id);
+    void refreshParamRequest(QString param_id);
 
 public slots:
     void showContextMenu(const QPoint &pos);

src/ui/QGCParamWidget.cc

@@ -79,6 +79,8 @@ void QGCParamWidget::connectViewSignalsAndSlots()
             this, SLOT(parameterItemChanged(QTreeWidgetItem*,int)));
     connect(tree, &QGCParamTreeWidget::mapRCToParamRequest, this,
             &QGCParamWidget::configureRCToParam);
+    connect(tree, &QGCParamTreeWidget::refreshParamRequest, this,
+            &QGCParamWidget::requestOnboardParamUpdate);
 }