Improve launcher feedback when location is disabled

Also improve warning text about conflicting args

src/GUI/qml/Launcher.qml

@@ -8,7 +8,13 @@ Item {
         id: pagesModel
         ListElement { title: qsTr("Summary"); pageSource: "qrc:///qml/Summary.qml"; iconPath: "qrc:///toolbox-summary"; state:"loader" }
         ListElement { title: qsTr("Aircraft"); pageSource: "qrc:///qml/AircraftList.qml"; iconPath: "qrc:///toolbox-aircraft"; state:"loader" }
-        ListElement { title: qsTr("Location"); pageSource: "qrc:///qml/Location.qml"; iconPath: "qrc:///toolbox-location"; state:"loader" }
+        
+        ListElement { 
+            title: qsTr("Location"); pageSource: "qrc:///qml/Location.qml"; 
+            iconPath: "qrc:///toolbox-location"; state:"loader"
+            buttonDisabled: false
+            disabledText: qsTr("Location page disabled due to conflicting user arguments (in Settings)");
+        }
 
         // due to some design stupidity by James, we can't use the Loader mechanism for these pages; they need to exist
         // permanently so that collecting args works. So we instantiate them down below, and toggle the visiblity
@@ -21,6 +27,11 @@ Item {
 
     }
 
+    Connections {
+        target: _location
+        onSkipFromArgsChanged: pagesModel.setProperty(2, "buttonDisabled", _location.skipFromArgs)
+    }
+
     states: [
         State {
             name: "loader"

src/GUI/qml/SettingExtraArguments.qml

@@ -22,7 +22,20 @@ SettingControl {
             enabled: root.enabled
             text: qsTr("Enter additional command-line arguments if any are required. " +
                        "See <a href=\"http://flightgear.sourceforge.net/getstart-en/getstart-enpa2.html#x5-450004.5\">here</a> " +
-                       "for documentation on possible arguments.");
+                       "for documentation on possible arguments. " +
+                       "<br>" +
+                       "<b>Warning:</b> values entered here always override other settings; <a href=\"#view-command-line\">click here</a> " +
+                       "to view the final set of arguments that will be used"
+                       );
+
+            onLinkActivated: {
+                if (link == "#view-command-line") {
+                    _launcher.viewCommandLine();
+                } else {
+                    Qt.openUrlExternally(link)
+                }
+            }
+
             width: parent.width
         }
 

src/GUI/qml/Sidebar.qml

@@ -33,6 +33,8 @@ Rectangle {
                     root.selectPage(model.pageSource);
                 }
 
+                enabled: !model.buttonDisabled
+                disabledText: model.hasOwnProperty("disabledText") ? model.disabledText : ""
                 selected: (model.index === root.selectedPage)
             }
         }
@@ -44,6 +46,7 @@ Rectangle {
         anchors.bottom: parent.bottom
         anchors.bottomMargin: Style.margin
         enabled: _launcher.canFly
+        disabledText: qsTr("The selected aircraft is not installed")
         icon: "qrc:///toolbox-fly"
         onClicked: _launcher.fly();
     }

src/GUI/qml/SidebarButton.qml

@@ -16,7 +16,10 @@ Item {
     property bool selected: false
     property bool enabled: true
 
+    property string disabledText: ""
+
     Rectangle {
+        id: baseRect
         anchors.fill: parent
         visible: root.enabled & (root.selected | mouse.containsMouse)
         color: Style.activeColor
@@ -42,9 +45,78 @@ Item {
 
     MouseArea {
         id: mouse
-        enabled: root.enabled
         anchors.fill: parent
         hoverEnabled: true
-        onClicked: root.clicked();
+        onClicked: if (root.enabled) root.clicked();
+
+        onEntered: {
+            // disabled tooltip
+            if (!root.enabled) tooltipTimer.restart()
         }
+
+        onExited: {
+            tooltipTimer.stop()
+            disabledTextBox.hide();
+        }
+    }
+
+    Timer {
+        id: tooltipTimer
+        onTriggered: {
+            disabledTextBox.show()
+        }
+    }
+
+    Rectangle {
+        id: disabledTextBox
+        height:disabledTextContent.implicitHeight + Style.margin * 2
+        width: disabledTextContent.implicitWidth + Style.margin * 2
+        color: Style.themeColor
+        visible: false  
+
+        anchors.left: baseRect.right
+        anchors.verticalCenter: baseRect.verticalCenter
+
+        function show() {
+            hideDisabledAnimation.stop();
+            showDisabledAnimation.start();
+        }
+
+        function hide() {
+            if (!visible)
+                return;
+            showDisabledAnimation.stop();
+            hideDisabledAnimation.start();
+        }
+
+        Text {
+            id: disabledTextContent
+            x: Style.margin
+            y: Style.margin
+            color: "white"
+            font.pixelSize: Style.subHeadingFontPixelSize
+            verticalAlignment: Text.AlignVCenter
+            text: root.disabledText
+        }
+
+        SequentialAnimation {
+            id: showDisabledAnimation
+            PropertyAction { target:disabledTextBox; property:"visible"; value: true }
+            NumberAnimation { 
+                target:disabledTextBox; property:"opacity"
+                from: 0.0; to: 1.0
+                duration: 500
+            }
+        }
+
+        SequentialAnimation {
+            id: hideDisabledAnimation
+            NumberAnimation { 
+                target:disabledTextBox; property:"opacity"
+                from: 1.0; to: 0.0
+                duration: 500
+            }
+            PropertyAction { target:disabledTextBox; property:"visible"; value: false }
+        }
+    } // of disabled text box
 }