input (text/checkbox), form, button

addons/SmoothScroll/scroll_damper/scroll_damper.gd

@@ -0,0 +1,74 @@
+@icon("icon.svg")
+extends Resource
+class_name ScrollDamper
+
+## Abstract class
+
+## Rebound strength. The higher the value, the faster it attracts. 
+@export_range(0.0, 1.0, 0.001, "or_greater", "hide_slider")
+var rebound_strength := 7.0:
+	set(val):
+		rebound_strength= max(val, 0.0)
+		_attract_factor = rebound_strength * rebound_strength * rebound_strength
+
+## Factor for attracting.
+var _attract_factor := 400.0:
+	set(val):
+		_attract_factor = max(val, 0.0)
+
+
+# Abstract method
+func _calculate_velocity_by_time(time: float) -> float:
+	return 0.0
+
+# Abstract method
+func _calculate_time_by_velocity(velocity: float) -> float:
+	return 0.0
+
+# Abstract method
+func _calculate_offset_by_time(time: float) -> float:
+	return 0.0
+
+# Abstract method
+func _calculate_time_by_offset(offset: float) -> float:
+	return 0.0
+
+
+func _calculate_velocity_to_dest(from: float, to: float) -> float:
+	var dist = to - from
+	var time = _calculate_time_by_offset(abs(dist))
+	var vel = _calculate_velocity_by_time(time) * sign(dist)
+	return vel
+
+
+func _calculate_next_velocity(present_time: float, delta_time: float) -> float:
+	return _calculate_velocity_by_time(present_time - delta_time)
+
+
+func _calculate_next_offset(present_time: float, delta_time: float) -> float:
+	return _calculate_offset_by_time(present_time) \
+		 - _calculate_offset_by_time(present_time - delta_time)
+
+
+## Return the result of next velocity and position according to delta time
+func slide(velocity: float, delta_time: float) -> Array:
+	var present_time = _calculate_time_by_velocity(velocity)
+	return [
+		_calculate_next_velocity(present_time, delta_time) * sign(velocity),
+		_calculate_next_offset(present_time, delta_time) * sign(velocity)
+	]
+
+
+## Emulate force that attracts something to destination.
+## Return the result of next velocity according to delta time
+func attract(from: float, to: float, velocity: float, delta_time: float) -> float:
+	var dist = to - from
+	var target_vel = _calculate_velocity_to_dest(from, to)
+	velocity += _attract_factor * dist * delta_time \
+		 + _calculate_velocity_by_time(delta_time) * sign(dist)
+	if (
+		(dist > 0 and velocity >= target_vel) \
+		or (dist < 0 and velocity <= target_vel) \
+	):
+		velocity = target_vel
+	return velocity