[Pages][Welcome] Turn updateData off when this page is not visible

Author: kubark42

mobile/StatPage.qml

@@ -28,6 +28,7 @@ import Vedder.vesc.utility 1.0
 Item {
     property Commands mCommands: VescIf.commands()
     property bool isHorizontal: width > height
+    property alias updateData: commandsUpdate.enabled
 
     Component.onCompleted: {
         mCommands.emitEmptyStats()
@@ -87,6 +88,7 @@ Item {
     }
 
     Connections {
+        id: commandsUpdate
         target: mCommands
 
         onValuesSetupReceived: {

pages/pagewelcome.cpp

@@ -29,6 +29,8 @@
 #include <QSettings>
 #include <QmlHighlighter>
 #include <QQuickItem>
+#include <QQmlProperty>
+
 
 PageWelcome::PageWelcome(QWidget *parent) :
     QWidget(parent),
@@ -113,8 +115,39 @@ void PageWelcome::setVesc(VescInterface *vesc)
     ui->qmlWidget->engine()->rootContext()->setContextProperty("Utility", &mUtil);
 
     ui->qmlWidget->setSource(QUrl(QLatin1String("qrc:/res/qml/WelcomeQmlPanel.qml")));
+
+    // Install an event filter to monitor for when this QML widget becomes hidden
+    ui->qmlWidget->installEventFilter(this);
+}
+
+
+bool PageWelcome::eventFilter(QObject *obj, QEvent *event)
+{
+   switch(event->type()) {
+   case QEvent::Show: {
+      // Set the telemetry to active when this page is visible
+      bool ret = QQmlProperty::write(ui->qmlWidget->rootObject(), "shouldTelemetryBeActive", true);
+      if (ret == false) {
+         qDebug() << "[QML][Error] shouldTelemetryBeActive was not successfully written. Perhaps that variable no longer exists in the QML component file?";
+      }
+   } break;
+   case QEvent::Hide: {
+      // Set the telemetry to inactive when this page is not visible
+      bool ret = QQmlProperty::write(ui->qmlWidget->rootObject(), "shouldTelemetryBeActive", false);
+
+      if (ret == false) {
+         qDebug() << "[QML][Error] shouldTelemetryBeActive was not successfully written. Perhaps that variable no longer exists in the QML component file?";
+      }
+   } break;
+   default: {
+   } break;
+   }
+
+   return QObject::eventFilter(obj, event);
 }
 
+
+
 void PageWelcome::on_autoConnectButton_clicked()
 {
     Utility::autoconnectBlockingWithProgress(mVesc, this);

pages/pagewelcome.h

@@ -56,6 +56,9 @@ private slots:
     QmlUi mQmlUi;
     Utility mUtil;
 
+protected:
+    bool eventFilter(QObject *obj, QEvent *event);
+
 };
 
 #endif // PAGEWELCOME_H

res/qml/WelcomeQmlPanel.qml

@@ -37,6 +37,8 @@ Item {
     property int notchBot: 0
     property int notchTop: 0
 
+    property bool shouldTelemetryBeActive: true
+
     function setupMotors() {
         if (!VescIf.isPortConnected()) {
             VescIf.emitMessageDialog("Setup motors FOC",
@@ -213,13 +215,15 @@ Item {
                         RtDataSetup {
                             anchors.fill: parent
                             dialogParent: container
+                            updateData: shouldTelemetryBeActive
                         }
                     }
 
                     Page {
                         StatPage {
                             anchors.fill: parent
                             anchors.margins: 20
+                            updateData: shouldTelemetryBeActive
                         }
                     }
                 }