Add option to enforce the use (and passing) the checklist before being allowed to arm.

src/FlightDisplay/FlightDisplayView.qml

@@ -49,6 +49,8 @@ Item {
     property var    _rallyPointController:          _planController.rallyPointController
     property bool   _isPipVisible:                  QGroundControl.videoManager.hasVideo ? QGroundControl.loadBoolGlobalSetting(_PIPVisibleKey, true) : false
     property bool   _useChecklist:                  QGroundControl.settingsManager.appSettings.useChecklist.rawValue && QGroundControl.corePlugin.options.preFlightChecklistUrl.toString().length
+    property bool   _enforceChecklist:              _useChecklist && QGroundControl.settingsManager.appSettings.enforceChecklist.rawValue
+    property bool   _canArm:                        activeVehicle ? (_useChecklist ? (_enforceChecklist ? activeVehicle.checkListState === Vehicle.CheckListPassed : true) : true) : false
     property real   _margins:                       ScreenTools.defaultFontPixelWidth / 2
     property real   _pipSize:                       mainWindow.width * 0.2
     property alias  _guidedController:              guidedActionsController
@@ -595,7 +597,7 @@ Item {
                     name:               _guidedController.takeoffTitle,
                     iconSource:         "/res/takeoff.svg",
                     buttonVisible:      _guidedController.showTakeoff || !_guidedController.showLand,
-                    buttonEnabled:      _guidedController.showTakeoff,
+                    buttonEnabled:      _guidedController.showTakeoff && _canArm,
                     action:             _guidedController.actionTakeoff
                 },
                 {
@@ -623,7 +625,7 @@ Item {
                     name:               qsTr("Action"),
                     iconSource:         "/res/action.svg",
                     buttonVisible:      !_guidedController.showPause,
-                    buttonEnabled:      _anyActionAvailable,
+                    buttonEnabled:      _anyActionAvailable && _canArm,
                     action:             -1
                 }
             ]
@@ -657,7 +659,7 @@ Item {
             z:                  _flightVideoPipControl.z + 1
 
             onShowStartMissionChanged: {
-                if (showStartMission) {
+                if (showStartMission && _canArm) {
                     confirmAction(actionStartMission)
                 }
             }

src/Settings/App.SettingsGroup.json

@@ -139,6 +139,13 @@
     "defaultValue":     false
 },
 {
+    "name":             "enforceChecklist",
+    "shortDescription": "Preflight checklist must pass before arming",
+    "longDescription":  "If this option is enabled the preflight checklist must pass before arming.",
+    "type":             "bool",
+    "defaultValue":     false
+},
+{
     "name":                 "appFontPointSize",
     "shortDescription":     "Application font size",
     "longDescription":      "The point size for the default font used.",

src/Settings/AppSettings.cc

@@ -85,6 +85,7 @@ DECLARE_SETTINGSFACT(AppSettings, showLargeCompass)
 DECLARE_SETTINGSFACT(AppSettings, savePath)
 DECLARE_SETTINGSFACT(AppSettings, autoLoadMissions)
 DECLARE_SETTINGSFACT(AppSettings, useChecklist)
+DECLARE_SETTINGSFACT(AppSettings, enforceChecklist)
 DECLARE_SETTINGSFACT(AppSettings, mapboxToken)
 DECLARE_SETTINGSFACT(AppSettings, esriToken)
 DECLARE_SETTINGSFACT(AppSettings, defaultFirmwareType)

src/Settings/AppSettings.h

@@ -46,6 +46,7 @@ public:
     DEFINE_SETTINGFACT(savePath)
     DEFINE_SETTINGFACT(autoLoadMissions)
     DEFINE_SETTINGFACT(useChecklist)
+    DEFINE_SETTINGFACT(enforceChecklist)
     DEFINE_SETTINGFACT(mapboxToken)
     DEFINE_SETTINGFACT(esriToken)
     DEFINE_SETTINGFACT(defaultFirmwareType)

src/ui/preferences/GeneralSettings.qml

@@ -475,14 +475,24 @@ Rectangle {
                             spacing:                    _margins
 
                             FactCheckBox {
-                                text:       qsTr("Use Preflight Checklist")
-                                fact:       _useChecklist
-                                visible:    _useChecklist.visible && QGroundControl.corePlugin.options.preFlightChecklistUrl.toString().length
+                                id:             useCheckList
+                                text:           qsTr("Use Preflight Checklist")
+                                fact:           _useChecklist
+                                visible:        _useChecklist.visible && QGroundControl.corePlugin.options.preFlightChecklistUrl.toString().length
 
                                 property Fact _useChecklist: QGroundControl.settingsManager.appSettings.useChecklist
                             }
 
                             FactCheckBox {
+                                text:           qsTr("Enforce Preflight Checklist")
+                                fact:           _enforceChecklist
+                                enabled:        QGroundControl.settingsManager.appSettings.useChecklist.value
+                                visible:        useCheckList.visible && _enforceChecklist.visible && QGroundControl.corePlugin.options.preFlightChecklistUrl.toString().length
+
+                                property Fact _enforceChecklist: QGroundControl.settingsManager.appSettings.enforceChecklist
+                            }
+
+                            FactCheckBox {
                                 text:       qsTr("Keep Map Centered On Vehicle")
                                 fact:       _keepMapCenteredOnVehicle
                                 visible:    _keepMapCenteredOnVehicle.visible