Third gamepad (#110)

Co-authored-by: Levi Lesches <[email protected]>

lib/src/models/rover/rover.dart

@@ -22,6 +22,9 @@ class Rover extends Model {
 	/// Listens for inputs on the second connected gamepad.
 	final controller2 = Controller(1, ArmControls());
 
+  	/// Listens for inputs on the third connected gamepad.
+	final controller3 = Controller(2, CameraControls());
+
 	/// Whether the rover is connected.
 	bool get isConnected => models.sockets.data.isConnected;
 
@@ -33,6 +36,7 @@ class Rover extends Model {
 		await metrics.init();
 		await controller1.init();
 		await controller2.init();
+    await controller3.init();
 		await settings.init();
 
 		metrics.addListener(notifyListeners);
@@ -47,6 +51,7 @@ class Rover extends Model {
 		metrics.dispose();
 		controller1.dispose();
 		controller2.dispose();
+    controller3.dispose();
 		settings.dispose();
 		super.dispose();
 	}

lib/src/services/gamepad.dart

@@ -140,7 +140,7 @@ const vibrateIntensity = 65000;
 /// [update] to read any button presses, or else [Gamepad.state] will never update.
 class GamepadService extends Service {
   /// The maximum number of gamepads we support.
-  static const int numGamepads = 2;
+  static const int numGamepads = 3;
 
   /// A list of all the [Gamepad]s the user has connected.
   /// 

lib/src/widgets/generic/gamepad.dart

@@ -79,6 +79,8 @@ class GamepadButtons extends StatelessWidget {
 			GamepadButton(controller: models.rover.controller1),
 			const SizedBox(width: 8),
 			GamepadButton(controller: models.rover.controller2),
+      const SizedBox(width: 8),
+			GamepadButton(controller: models.rover.controller3),
 		],
 	);
 }