1 files changed, 68 insertions, 0 deletions
diff --git a/ui/touch_item_list/touch_item_list.gd b/ui/touch_item_list/touch_item_list.gd
new file mode 100644
index 0000000..6794138
--- /dev/null
+++ b/ui/touch_item_list/touch_item_list.gd
@@ -0,0 +1,68 @@
+extends ItemList
+class_name TouchItemList
+
+const POINTER_VELOCITY_DECAYING_FACTOR: float = PI
+const POINTER_VELOCITY_BOOST_FACTOR: float = 1.25
+const EXACT_SELECTION: bool = true
+
+var is_pointer_dragging		:= false
+var pointer_drag_velocity	:= 0.0
+var when_last_dragged		:= 0
+
+onready var sensor			:= get_node("sensor") as PointerInputSensor
+onready var v_scroll_bar	:= get_v_scroll() as ScrollBar
+
+
+func _ready():
+	sensor.connect("on_press", self, "pointer_input_on_press_handler")
+	sensor.connect("on_drag", self, "pointer_input_on_drag_handler")
+	sensor.connect("on_end_drag", self, "pointer_input_on_end_drag_handler")
+	sensor.connect("on_click", self, "pointer_input_on_click_handler")
+	sensor.connect("on_scroll", self, "pointer_input_on_scroll_handler")
+
+
+func _process(delta: float):
+	# Apply drag movement inertia.
+	if is_pointer_dragging == false && abs(pointer_drag_velocity) > 0.5:
+		pointer_drag_velocity *= clamp((1.0 - POINTER_VELOCITY_DECAYING_FACTOR * delta), 0.0, 1.0)
+		v_scroll_bar.value -= pointer_drag_velocity * delta
+
+
+func pointer_input_on_press_handler(pointer: PointerInputSensor.PointerInputData):
+	is_pointer_dragging = true
+	grab_focus()
+
+
+func pointer_input_on_drag_handler(pointer: PointerInputSensor.PointerInputData):
+	is_pointer_dragging = true
+	var reported_velocity_abs := abs(pointer.velocity.y)
+	var relative_velocity := pointer.relative_position.y * Engine.get_frames_per_second()
+	var relative_velocity_abs := abs(relative_velocity)
+	pointer_drag_velocity = pointer.velocity.y if reported_velocity_abs > relative_velocity_abs else relative_velocity
+	v_scroll_bar.value -= pointer.relative_position.y
+	when_last_dragged = OS.get_ticks_msec()
+
+
+func pointer_input_on_end_drag_handler(pointer: PointerInputSensor.PointerInputData):
+	is_pointer_dragging = false
+	if OS.get_ticks_msec() - when_last_dragged > 20:
+		pointer_drag_velocity = 0.0
+	else:
+		pointer_drag_velocity *= POINTER_VELOCITY_BOOST_FACTOR
+
+
+func pointer_input_on_click_handler(pointer: PointerInputSensor.PointerInputData):
+	var selected_idx := get_item_at_position(pointer.current_position - rect_global_position, EXACT_SELECTION)
+	if selected_idx >= 0:
+		select(selected_idx)
+		emit_signal("item_selected", selected_idx)
+	else:
+		unselect_all()
+		emit_signal("nothing_selected")
+
+
+func pointer_input_on_scroll_handler(pointer: PointerInputSensor.PointerInputData):
+	var target := self
+	target._gui_input(pointer.event)
+
+