Provide detection and help for unmapped gamepads. Fixes #70

app/gui/PcView.qml

@@ -46,6 +46,12 @@ GridView {
             noHwDecoderDialog.open()
         }
 
+        var unmappedGamepads = prefs.getUnmappedGamepads()
+        if (unmappedGamepads) {
+            unmappedGamepadDialog.unmappedGamepads = unmappedGamepads
+            unmappedGamepadDialog.open()
+        }
+
         // Don't show any highlighted item until interacting with them
         currentIndex = -1
     }
@@ -244,6 +250,20 @@ GridView {
         }
     }
 
+    MessageDialog {
+        id: unmappedGamepadDialog
+        property string unmappedGamepads : ""
+        modality:Qt.WindowModal
+        icon: StandardIcon.Warning
+        standardButtons: StandardButton.Ok | StandardButton.Help
+        text: "Moonlight detected gamepads without a proper mapping. " +
+              "The following gamepads will not function until this is resolved: " + unmappedGamepads + "\n\n" +
+              "Click the Help button for information on how to map your gamepads."
+        onHelp: {
+            Qt.openUrlExternally("https://github.com/moonlight-stream/moonlight-docs/wiki/Gamepad-Mapping");
+        }
+    }
+
     MessageDialog {
         id: pairDialog
         // don't allow edits to the rest of the window while open