show custom keymap hint for gamepads

lib/pages/device.dart

@@ -151,6 +151,12 @@ class _DevicePageState extends State<DevicePage> with WidgetsBindingObserver {
                           Text('Enable auto-rotation on your device to make sure the app works correctly.'),
                         ],
                       ),
+                    if (connection.gamepadDevices.isNotEmpty && actionHandler.supportedApp is! CustomApp)
+                      Warning(
+                        children: [
+                          Text('Your gamepad requires a custom keymap to be able to use all buttons.'),
+                        ],
+                      ),
                     Padding(
                       padding: const EdgeInsets.symmetric(horizontal: 4),
                       child: Text('Connected Devices', style: Theme.of(context).textTheme.titleMedium),

lib/widgets/keymap_explanation.dart

@@ -101,8 +101,11 @@ class _KeymapExplanationState extends State<KeymapExplanation> {
                       crossAxisAlignment: WrapCrossAlignment.center,
                       children: [
                         if (actionHandler.supportedApp is! CustomApp)
-                          for (final button in keyPair.buttons.filter((b) => allAvailableButtons.contains(b)))
-                            IntrinsicWidth(child: ButtonWidget(button: button))
+                          if (keyPair.buttons.filter((b) => allAvailableButtons.contains(b)).isEmpty)
+                            Text('No button assigned for your connected device')
+                          else
+                            for (final button in keyPair.buttons.filter((b) => allAvailableButtons.contains(b)))
+                              IntrinsicWidth(child: ButtonWidget(button: button))
                         else
                           for (final button in keyPair.buttons) IntrinsicWidth(child: ButtonWidget(button: button)),
                       ],

lib/widgets/warning.dart

@@ -8,6 +8,7 @@ class Warning extends StatelessWidget {
   Widget build(BuildContext context) {
     return Container(
       margin: EdgeInsets.only(bottom: 6),
+      width: double.infinity,
       decoration: BoxDecoration(
         color: Theme.of(context).colorScheme.errorContainer,
         borderRadius: BorderRadius.circular(8),

macos/Podfile.lock

@@ -20,8 +20,6 @@ PODS:
     - FlutterMacOS
   - screen_retriever_macos (0.0.1):
     - FlutterMacOS
-  - share_plus (0.0.1):
-    - FlutterMacOS
   - shared_preferences_foundation (0.0.1):
     - Flutter
     - FlutterMacOS
@@ -46,7 +44,6 @@ DEPENDENCIES:
   - package_info_plus (from `Flutter/ephemeral/.symlinks/plugins/package_info_plus/macos`)
   - path_provider_foundation (from `Flutter/ephemeral/.symlinks/plugins/path_provider_foundation/darwin`)
   - screen_retriever_macos (from `Flutter/ephemeral/.symlinks/plugins/screen_retriever_macos/macos`)
-  - share_plus (from `Flutter/ephemeral/.symlinks/plugins/share_plus/macos`)
   - shared_preferences_foundation (from `Flutter/ephemeral/.symlinks/plugins/shared_preferences_foundation/darwin`)
   - universal_ble (from `Flutter/ephemeral/.symlinks/plugins/universal_ble/darwin`)
   - url_launcher_macos (from `Flutter/ephemeral/.symlinks/plugins/url_launcher_macos/macos`)
@@ -74,8 +71,6 @@ EXTERNAL SOURCES:
     :path: Flutter/ephemeral/.symlinks/plugins/path_provider_foundation/darwin
   screen_retriever_macos:
     :path: Flutter/ephemeral/.symlinks/plugins/screen_retriever_macos/macos
-  share_plus:
-    :path: Flutter/ephemeral/.symlinks/plugins/share_plus/macos
   shared_preferences_foundation:
     :path: Flutter/ephemeral/.symlinks/plugins/shared_preferences_foundation/darwin
   universal_ble:
@@ -98,7 +93,6 @@ SPEC CHECKSUMS:
   package_info_plus: 12f1c5c2cfe8727ca46cbd0b26677728972d9a5b
   path_provider_foundation: 0b743cbb62d8e47eab856f09262bb8c1ddcfe6ba
   screen_retriever_macos: 776e0fa5d42c6163d2bf772d22478df4b302b161
-  share_plus: 1fa619de8392a4398bfaf176d441853922614e89
   shared_preferences_foundation: fcdcbc04712aee1108ac7fda236f363274528f78
   universal_ble: cf52a7b3fd2e7c14d6d7262e9fdadb72ab6b88a6
   url_launcher_macos: c82c93949963e55b228a30115bd219499a6fe404