Add virtualJoystickCentralized setting

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/FlightDisplay/FlightDisplayViewWidgets.qml

@@ -86,6 +86,10 @@ Item {
         target:         QGroundControl.settingsManager.appSettings.virtualJoystick
         onValueChanged: _setInstrumentWidget()
     }
+    Connections {
+        target:         QGroundControl.settingsManager.appSettings.virtualJoystickCentralized
+        onValueChanged: _setInstrumentWidget()
+    }
 
     Connections {
         target:         QGroundControl.settingsManager.appSettings.showLargeCompass

src/Settings/App.SettingsGroup.json

@@ -103,6 +103,13 @@
     "type":             "bool",
     "defaultValue":     false
 },
+{
+    "name":             "virtualJoystickCentralized",
+    "shortDescription": "Set virtual joystick to be centralize throttle (spring-loaded).",
+    "longDescription":  "If this option is enabled the virtual joystick throttle stick will be centralized.",
+    "type":             "bool",
+    "defaultValue":     false
+},
 {
     "name":             "gstDebugLevel",
     "shortDescription": "Video streaming debug",

src/Settings/AppSettings.cc

@@ -78,6 +78,7 @@ DECLARE_SETTINGSFACT(AppSettings, telemetrySave)
 DECLARE_SETTINGSFACT(AppSettings, telemetrySaveNotArmed)
 DECLARE_SETTINGSFACT(AppSettings, audioMuted)
 DECLARE_SETTINGSFACT(AppSettings, virtualJoystick)
+DECLARE_SETTINGSFACT(AppSettings, virtualJoystickCentralized)
 DECLARE_SETTINGSFACT(AppSettings, appFontPointSize)
 DECLARE_SETTINGSFACT(AppSettings, showLargeCompass)
 DECLARE_SETTINGSFACT(AppSettings, savePath)

src/Settings/AppSettings.h

@@ -33,6 +33,7 @@ public:
     DEFINE_SETTINGFACT(telemetrySaveNotArmed)
     DEFINE_SETTINGFACT(audioMuted)
     DEFINE_SETTINGFACT(virtualJoystick)
+    DEFINE_SETTINGFACT(virtualJoystickCentralized)
     DEFINE_SETTINGFACT(appFontPointSize)
     DEFINE_SETTINGFACT(indoorPalette)
     DEFINE_SETTINGFACT(showLargeCompass)

src/ui/preferences/GeneralSettings.qml

@@ -455,6 +455,17 @@ QGCView {
                                 property Fact _virtualJoystick: QGroundControl.settingsManager.appSettings.virtualJoystick
                             }
 
+                            FactCheckBox {
+                                text:       qsTr("Auto-Center throttle")
+                                visible:    _virtualJoystickCentralized.visible && (
+                                        QGroundControl.multiVehicleManager.activeVehicle.sub || QGroundControl.multiVehicleManager.activeVehicle.rover
+                                    )
+                                fact:       _virtualJoystickCentralized
+                                Layout.leftMargin: _margins
+
+                                property Fact _virtualJoystickCentralized: QGroundControl.settingsManager.appSettings.virtualJoystickCentralized
+                            }
+
                             GridLayout {
                                 columns: 2