Reject conflicting controller bindings

settings/controller_mapping_manager.gd

@@ -282,7 +282,7 @@ func _validated_profiles(raw_profiles: Dictionary) -> Dictionary:
 			):
 				complete = false
 				break
-		if not complete:
+		if not complete or bindings_have_conflicts(bindings):
 			continue
 		validated[str(key_value)] = {
 			"controller_name": str(
@@ -402,6 +402,8 @@ func replace_active_bindings(bindings: Dictionary) -> bool:
 			return false
 		if not validate_binding(role, binding as Dictionary):
 			return false
+	if bindings_have_conflicts(bindings):
+		return false
 	var previous: Dictionary = _profiles.duplicate(true)
 	_profiles[_active_profile_key] = {
 		"controller_name": _active_controller_name,
@@ -484,6 +486,53 @@ func validate_binding(role: StringName, binding: Dictionary) -> bool:
 	)
 
 
+static func bindings_have_conflicts(bindings: Dictionary) -> bool:
+	for role_index: int in ROLE_ORDER.size():
+		var first_role: StringName = ROLE_ORDER[role_index]
+		var first_value: Variant = bindings.get(str(first_role), {})
+		if typeof(first_value) != TYPE_DICTIONARY:
+			continue
+		for other_index: int in range(role_index + 1, ROLE_ORDER.size()):
+			var second_role: StringName = ROLE_ORDER[other_index]
+			var second_value: Variant = bindings.get(str(second_role), {})
+			if typeof(second_value) != TYPE_DICTIONARY:
+				continue
+			if bindings_conflict(
+				first_role,
+				first_value as Dictionary,
+				second_role,
+				second_value as Dictionary,
+			):
+				return true
+	return false
+
+
+static func bindings_conflict(
+	first_role: StringName,
+	first: Dictionary,
+	second_role: StringName,
+	second: Dictionary,
+) -> bool:
+	var binding_kind: String = str(first.get("kind", ""))
+	if binding_kind != str(second.get("kind", "")):
+		return false
+	if binding_kind == "button":
+		return int(first.get("button", -1)) == int(
+			second.get("button", -1)
+		)
+	if binding_kind != "axis":
+		return false
+	if int(first.get("axis", -1)) != int(second.get("axis", -1)):
+		return false
+	var opposite_trigger_halves: bool = (
+		first_role in TRIGGER_ROLES
+		and second_role in TRIGGER_ROLES
+		and signf(float(first.get("direction", 0.0)))
+			!= signf(float(second.get("direction", 0.0)))
+	)
+	return not opposite_trigger_halves
+
+
 func binding_label(binding: Dictionary) -> String:
 	if str(binding.get("kind", "")) == "button":
 		return _button_label(int(binding.get("button", -1)))

tests/controller_mapping_validation.gd

@@ -152,6 +152,10 @@ func _validate_manager(manager: ControllerMappingManagerType) -> String:
 		"kind": "button",
 		"button": int(JOY_BUTTON_X),
 	}
+	custom[str(ControllerMappingManagerType.ROLE_X)] = {
+		"kind": "button",
+		"button": int(JOY_BUTTON_A),
+	}
 	custom[str(ControllerMappingManagerType.ROLE_POINTER_MODIFIER)] = (
 		trigger_binding
 	)
@@ -159,6 +163,41 @@ func _validate_manager(manager: ControllerMappingManagerType) -> String:
 		return "valid custom mapping could not be saved"
 	if not manager.has_custom_mapping():
 		return "saved custom mapping did not become active"
+	var duplicate: Dictionary = custom.duplicate(true)
+	duplicate[str(ControllerMappingManagerType.ROLE_X)] = (
+		duplicate[str(ControllerMappingManagerType.ROLE_A)] as Dictionary
+	).duplicate(true)
+	if manager.replace_active_bindings(duplicate):
+		return "duplicate controller buttons were accepted"
+	var shared_trigger_axis: Dictionary = custom.duplicate(true)
+	shared_trigger_axis[
+		str(ControllerMappingManagerType.ROLE_POINTER_MODIFIER)
+	] = {
+		"kind": "axis",
+		"axis": int(JOY_AXIS_TRIGGER_LEFT),
+		"direction": 1.0,
+		"rest": 0.0,
+	}
+	shared_trigger_axis[
+		str(ControllerMappingManagerType.ROLE_CAMERA_ZOOM)
+	] = {
+		"kind": "axis",
+		"axis": int(JOY_AXIS_TRIGGER_LEFT),
+		"direction": -1.0,
+		"rest": 0.0,
+	}
+	if ControllerMappingManagerType.bindings_have_conflicts(
+		shared_trigger_axis
+	):
+		return "opposite halves of a shared trigger axis conflict"
+	var malformed_profiles: Dictionary = manager._validated_profiles({
+		"name:controller": {
+			"controller_name": "controller",
+			"bindings": duplicate,
+		},
+	})
+	if not malformed_profiles.is_empty():
+		return "a stored controller profile with duplicate buttons was accepted"
 	if _keyboard_event_count(&"jump") != keyboard_events_before:
 		return "controller remapping changed keyboard bindings"
 	var active_button := InputEventJoypadButton.new()
@@ -309,12 +348,6 @@ func _validate_auto_map(manager: ControllerMappingManagerType) -> String:
 			ControllerMappingManagerType.default_bindings()[str(role)]
 			as Dictionary
 		)
-		if role == ControllerMappingManagerType.ROLE_B:
-			binding = (
-				ControllerMappingManagerType.default_bindings()[
-					str(ControllerMappingManagerType.ROLE_A)
-				] as Dictionary
-			)
 		if str(binding.get("kind", "")) == "button":
 			var button := InputEventJoypadButton.new()
 			button.device = manager.get_active_device_id()
@@ -335,24 +368,12 @@ func _validate_auto_map(manager: ControllerMappingManagerType) -> String:
 		ControllerMappingManagerType.ROLE_ORDER.size()
 	):
 		return "manual override list does not expose every mapped role"
-	var conflict_button := panel._binding_buttons.get(
+	var duplicate_saved: bool = manager.set_binding(
-		ControllerMappingManagerType.ROLE_A
-	) as Button
-	var conflict_style := conflict_button.get_theme_stylebox(
-		&"normal"
-	) as StyleBoxFlat
-	if (
-		conflict_style == null
-		or conflict_style.bg_color
-			!= UtilityPageStyle.OCEAN_DANGER
-	):
-		return "duplicate controller bindings were not marked in red"
-	manager.set_binding(
 		ControllerMappingManagerType.ROLE_B,
-		ControllerMappingManagerType.default_bindings()[
+		manager.get_binding(ControllerMappingManagerType.ROLE_A),
-			str(ControllerMappingManagerType.ROLE_B)
-		] as Dictionary,
 	)
+	if duplicate_saved:
+		return "manual mapping accepted a controller button already in use"
 	panel._begin_manual_capture(
 		ControllerMappingManagerType.ROLE_POINTER_MODIFIER
 	)

ui/controller_mapping_panel.gd

@@ -580,24 +580,12 @@ func _bindings_conflict(
 	second_role: StringName,
 	second: Dictionary,
 ) -> bool:
-	var binding_kind: String = str(first.get("kind", ""))
+	return ControllerMappingManagerType.bindings_conflict(
-	if binding_kind != str(second.get("kind", "")):
+		first_role,
-		return false
+		first,
-	if binding_kind == "button":
+		second_role,
-		return int(first.get("button", -1)) == int(
+		second,
-			second.get("button", -1)
-		)
-	if binding_kind != "axis":
-		return false
-	if int(first.get("axis", -1)) != int(second.get("axis", -1)):
-		return false
-	var opposite_trigger_halves: bool = (
-		first_role in ControllerMappingManagerType.TRIGGER_ROLES
-		and second_role in ControllerMappingManagerType.TRIGGER_ROLES
-		and signf(float(first.get("direction", 0.0)))
-			!= signf(float(second.get("direction", 0.0)))
 	)
-	return not opposite_trigger_halves
 
 
 func _apply_binding_button_style(button: Button, has_conflict: bool) -> void: