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extends Control
class_name OptionSetList
const POINTER_VELOCITY_DECAYING_FACTOR: float = PI
const POINTER_VELOCITY_BOOST_FACTOR: float = 1.25
const EXACT_SELECTION: bool = false
signal item_selected # (idx: int, text: String)
signal nothing_selected # ()
export var autowrap := true
var v_scroll_bar : VScrollBar
var sensor : PointerInputSensor
var is_pointer_dragging := false
var pointer_drag_velocity := 0.0
var when_last_dragged := 0
var labels : Control
var labels_end_positions: Array
var labels_sizes : Array
var items : Array
var selected_idx := -1
var is_dirty := true
var normal_style : StyleBoxFlat
var selected_style : StyleBoxFlat
var border_size := 5
onready var font : Font = get_font("font")
onready var screen_dpcm : float = float(OS.get_screen_dpi()) / 2.54
func _init():
self.anchor_right = 1.0
self.anchor_bottom = 1.0
self.rect_clip_content = true
labels = Control.new()
labels.anchor_right = 1.0
labels.anchor_bottom = 1.0
labels.mouse_filter = Control.MOUSE_FILTER_IGNORE
labels.name = "labels"
add_child(labels)
v_scroll_bar = VScrollBar.new()
v_scroll_bar.anchor_left = 1.0
v_scroll_bar.anchor_bottom = 1.0
v_scroll_bar.grow_horizontal = Control.GROW_DIRECTION_BEGIN
v_scroll_bar.name = "v_scroll_bar"
add_child(v_scroll_bar)
sensor = PointerInputSensor.new()
sensor.anchor_right = 1.0
sensor.anchor_bottom = 1.0
sensor.name = "sensor"
add_child(sensor)
normal_style = StyleBoxFlat.new()
normal_style.border_width_bottom = border_size
normal_style.border_color = Color.white * 0.333
normal_style.bg_color = Color.transparent
selected_style = StyleBoxFlat.new()
selected_style.border_width_bottom = border_size
selected_style.border_color = Color.white * 0.333
selected_style.bg_color = Color.dimgray
connect("resized", self, "mark_as_dirty")
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 mark_as_dirty():
is_dirty = true
func add_item(text: String):
items.append(text)
is_dirty = true
func add_items(texts: Array):
items.append_array(texts)
is_dirty = true
func set_item(index: int, text: String):
items[index] = text
is_dirty = true
func set_items(indices: Array, texts: Array):
for idx in indices.size():
items[indices[idx]] = texts[idx]
is_dirty = true
func remove_item(index: int):
items.remove(index)
is_dirty = true
func remove_items(indices: Array):
indices.sort()
var idx := indices.size()-1
while idx >= 0:
items.remove(indices[idx])
idx -= 1
is_dirty = true
func clear_items():
items.clear()
is_dirty = true
func build_labels():
var num_of_labels := int(min(
items.size(),
ceil(labels.rect_size.y / (font.get_height() + border_size)) + 1
))
var delta := num_of_labels - labels.get_child_count()
while delta > 0:
var label := Label.new()
label.autowrap = autowrap
label.anchor_right = 1.0
label.valign = Label.VALIGN_TOP
labels.add_child(label)
delta -= 1
while delta < 0:
var label := labels.get_child(0) as Label
labels.remove_child(label)
label.free()
delta += 1
labels_end_positions.clear()
labels_sizes.clear()
if num_of_labels == 0:
return
var position := 0.0
var proto_label := labels.get_child(0) as Label
var line_spacing := proto_label.get_constant("line_spacing")
var line_height := proto_label.get_line_height()
for it in items:
proto_label.text = it
var line_count := proto_label.get_line_count()
var height := line_count * line_height + (line_count - 1) * line_spacing + border_size
position += height
labels_end_positions.append(position)
labels_sizes.append(height)
func _process(delta):
if is_dirty:
build_labels()
is_dirty = false
var viewable_ratio := 1.0
var viewable_height := labels.rect_size.y
if items.size() > 0:
viewable_ratio = viewable_height / float(labels_end_positions.back())
v_scroll_bar.min_value = 0
v_scroll_bar.max_value = viewable_height / viewable_ratio
v_scroll_bar.visible = viewable_ratio < 1.0
v_scroll_bar.page = viewable_height
var labels_offset := v_scroll_bar.value
var idx_offset := labels_end_positions.bsearch(labels_offset)
var idx := idx_offset
for label in labels.get_children():
if idx >= items.size():
label.visible = false
continue
label.visible = true
label.text = items[idx]
label.rect_size.y = labels_sizes[idx]
label.rect_position.y = labels_end_positions[idx] - labels_sizes[idx] - labels_offset
if idx == selected_idx:
label.add_stylebox_override("normal", selected_style)
else:
label.add_stylebox_override("normal", normal_style)
idx += 1
var right_margin = - v_scroll_bar.rect_size.x if v_scroll_bar.visible else 0.0
labels.margin_right = right_margin
sensor.margin_right = right_margin
# 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 get_item_at_position(mouse_position: Vector2) -> int:
if items.size() == 0:
return -1
var labels_offset := v_scroll_bar.value
var position := mouse_position.y + labels_offset
var item_idx := labels_end_positions.bsearch(position)
return int(min(item_idx, items.size()-1)) # Return last item when position is below it.
func select(index: int):
selected_idx = index
emit_signal("item_selected", selected_idx, items[selected_idx])
func unselect():
selected_idx = -1
emit_signal("nothing_selected")
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)
if selected_idx >= 0:
select(selected_idx)
emit_signal("item_selected", selected_idx)
else:
unselect()
emit_signal("nothing_selected")
func pointer_input_on_scroll_handler(pointer: PointerInputSensor.PointerInputData):
pointer_drag_velocity -= pointer.scroll * POINTER_VELOCITY_BOOST_FACTOR * screen_dpcm
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