carousel scroll

app/scripts/ui/onboarding/carousel.gd

@@ -3,12 +3,23 @@ extends Control
 @export var ui_events: UiEvents
 @export var line: Control
 @export var close: Button
-@export var tween_duration: float
+
+@export var tween_duration: float = 0.3
+@export var drag_deadzone: float = 20.0
+@export var page_switch_threshold: float = 75.0
+@export var overscroll_softness: float = 30.0
+@export var overscroll_limit: float = 200.0
 
 var boards: Array[OnboardingBoard] = []
 var focused_page: int
 var tween: Tween
 
+var dragging: bool
+var drag_started: bool
+var drag_start_position: Vector2
+var drag_start_line_x: float
+var last_mouse_position: Vector2
+
 
 func _ready() -> void:
 	setup_boards()
@@ -59,3 +70,77 @@ func refresh_mouse_position() -> void:
 	var event = InputEventMouseMotion.new()
 	event.position = get_viewport().get_mouse_position()
 	Input.parse_input_event(event)
+
+
+func set_focus_buttons_disabled(disabled: bool) -> void:
+	close.disabled = disabled
+	for board in boards:
+		board.focus_button.disabled = disabled
+
+
+func _gui_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
+		if event.pressed:
+			# Start dragging
+			dragging = true
+			drag_started = false
+			drag_start_position = event.position
+			last_mouse_position = event.position
+			drag_start_line_x = line.position.x
+		else:
+			# End dragging
+			if dragging:
+				dragging = false
+				if not drag_started:
+					# Treat as click: if no tween is playing, keep current focused page
+					if not (is_instance_valid(tween) and tween.is_running()):
+						move_line(focused_page)
+					return
+				
+				# Drag was active: consume release and re-enable focus buttons
+				set_focus_buttons_disabled(false)
+				accept_event()
+				
+				# Decide target page based on drag distance/direction
+				var total_drag_x: float = event.position.x - drag_start_position.x
+				var last_index: int = boards.size() - 1
+				var target_index: int = focused_page
+				
+				if abs(total_drag_x) >= page_switch_threshold:
+					if total_drag_x < 0.0:
+						target_index = min(focused_page + 1, last_index)
+					else:
+						target_index = max(focused_page - 1, 0)
+				
+				move_line(target_index)
+	
+	elif event is InputEventMouseMotion:
+		if dragging:
+			var delta_x: float = event.position.x - last_mouse_position.x
+			if not drag_started:
+				var moved_enough: bool = abs(event.position.x - drag_start_position.x) >= drag_deadzone
+				if moved_enough:
+					drag_started = true
+					# Now that drag truly started, stop any ongoing tween
+					if is_instance_valid(tween): tween.stop()
+					set_focus_buttons_disabled(true)
+					accept_event()
+			
+			if drag_started:
+				var displacement: float = abs(line.position.x - drag_start_line_x)
+				var resistance: float = 1.0 / (1.0 + displacement / overscroll_softness)
+				var applied_dx: float = delta_x * resistance
+				var new_x: float = line.position.x + applied_dx
+				var delta_from_start: float = new_x - drag_start_line_x
+				
+				if delta_from_start > overscroll_limit:
+					new_x = drag_start_line_x + overscroll_limit
+				elif delta_from_start < -overscroll_limit:
+					new_x = drag_start_line_x - overscroll_limit
+				
+				line.position.x = new_x
+			
+			last_mouse_position = event.position
+			
+			if drag_started:
+				accept_event()