fix(Gamepad Settings): add mouse handling for gamepad settings button

core/ui/card_ui/settings/general_controller_settings_menu.gd

@@ -1,5 +1,42 @@
 extends Control
 
+var input_plumber := load("res://core/systems/input/input_plumber.tres") as InputPlumberInstance
+var state_machine := load("res://assets/state/state_machines/menu_state_machine.tres") as StateMachine
+var state := load("res://assets/state/states/gamepad_settings.tres") as State
+
+@onready var gamepad_button := $%GamepadSettingsButton as CardButton
+
 # Called when the node enters the scene tree for the first time.
 func _ready():
-	pass
+	gamepad_button.gui_input.connect(_on_button_input)
+
+
+# If the user presses the gamepad settings button with a non-gamepad input method,
+# open the settings for the first detected controller.
+# TODO: Add a controller select pop-up to select a gamepad to configure
+func _on_button_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton:
+		if (event as InputEventMouseButton).button_index != MOUSE_BUTTON_LEFT:
+			return
+		if (event as InputEventMouseButton).pressed:
+			return
+		_open_menu_default_gamepad()
+		return
+
+	if event is InputEventKey:
+		if !event.is_action("ui_accept"):
+			return
+		if event.pressed:
+			return
+		_open_menu_default_gamepad()
+
+
+# Push the gamepad config menu for the first detected controller.
+func _open_menu_default_gamepad() -> void:
+	state.set_meta("dbus_path", "")
+	var devices := input_plumber.get_composite_devices()
+	if !devices.is_empty():
+		var device := devices[0]
+		state.set_meta("dbus_path", device.dbus_path)
+
+	state_machine.push_state(state)

core/ui/card_ui/settings/general_controller_settings_menu.tscn

@@ -55,11 +55,12 @@ layout_mode = 2
 
 [node name="FocusGroup" parent="MarginContainer/VBoxContainer" instance=ExtResource("2_fdccl")]
 
-[node name="CardButton" parent="MarginContainer/VBoxContainer" instance=ExtResource("7_ynn8u")]
+[node name="GamepadSettingsButton" parent="MarginContainer/VBoxContainer" instance=ExtResource("7_ynn8u")]
+unique_name_in_owner = true
 layout_mode = 2
 text = "Gamepad Settings"
 
-[node name="StateUpdater" parent="MarginContainer/VBoxContainer/CardButton" instance=ExtResource("8_1egj0")]
+[node name="StateUpdater" parent="MarginContainer/VBoxContainer/GamepadSettingsButton" instance=ExtResource("8_1egj0")]
 state_machine = ExtResource("10_ij44t")
 state = ExtResource("10_uoc6p")
 on_signal = "player_button_up"