godot-accessibility/ScreenReader.gd

199 lines
5.9 KiB
GDScript

tool
extends Node
signal swipe_left
signal swipe_right
signal swipe_up
signal swipe_down
var Accessible = preload("Accessible.gd")
var accessibles = []
export var min_swipe_distance = 5
export var tap_execute_interval = 125
export var explore_by_touch_interval = 200
var focus_restore_timer
func focused(node):
focus_restore_timer = null
func click_focused(node):
pass
func unfocused(node):
focus_restore_timer = get_tree().create_timer(0.2)
func augment_node(node):
if node is Control:
var accessible = Accessible.new(node)
accessibles.append(accessible)
if not node.is_connected("focus_entered", self, "focused"):
node.connect("focus_entered", self, "focused", [node])
if not node.is_connected("mouse_entered", self, "click_focused"):
node.connect("mouse_entered", self, "click_focused", [node])
if not node.is_connected("focus_exited", self, "unfocused"):
node.connect("focus_exited", self, "unfocused", [node])
if not node.is_connected("mouse_exited", self, "unfocused"):
node.connect("mouse_exited", self, "unfocused", [node])
func augment_tree(node):
if node is Accessible:
return
augment_node(node)
for child in node.get_children():
augment_tree(child)
func set_initial_screen_focus(screen):
TTS.speak("%s: screen" % screen, false)
var control = find_focusable_control(get_tree().root)
if control.get_focus_owner() != null:
return
self.augment_tree(get_tree().root)
var focus = find_focusable_control(get_tree().root)
if not focus:
return
focus.grab_click_focus()
focus.grab_focus()
func find_focusable_control(node):
if node is Control and node.is_visible_in_tree() and (node.focus_mode == Control.FOCUS_CLICK or node.focus_mode == Control.FOCUS_ALL):
return node
for child in node.get_children():
var result = find_focusable_control(child)
if result:
return result
return null
func set_initial_scene_focus(scene):
self.augment_tree(get_tree().root)
var focus = find_focusable_control(get_tree().root)
if not focus:
return
focus.grab_click_focus()
focus.grab_focus()
func _enter_tree():
get_tree().connect("node_added", self, "augment_tree")
connect("swipe_right", self, "swipe_right")
connect("swipe_left", self, "swipe_left")
connect("swipe_up", self, "swipe_up")
connect("swipe_down", self, "swipe_down")
func _exit_tree():
for accessible in accessibles:
accessible.free()
accessibles = []
func press_and_release(action):
var event = InputEventAction.new()
event.action = action
event.pressed = true
get_tree().input_event(event)
event.pressed = false
get_tree().input_event(event)
func _ui_focus_next():
for event in InputMap.get_action_list("ui_focus_next"):
if event is InputEventKey:
event.pressed = true
Input.action_press("ui_focus_next")
get_tree().input_event(event)
event.pressed = false
Input.action_release("ui_focus_next")
get_tree().input_event(event)
return
func _ui_focus_prev():
for event in InputMap.get_action_list("ui_focus_prev"):
if event is InputEventKey:
event.pressed = true
Input.action_press("ui_focus_prev")
get_tree().input_event(event)
event.pressed = false
Input.action_release("ui_focus_prev")
get_tree().input_event(event)
return
func swipe_right():
_ui_focus_next()
func swipe_left():
_ui_focus_prev()
func swipe_up():
TTS.speak("Swipe up")
func swipe_down():
TTS.speak("Swipe down")
var touch_index = null
var touch_position = null
var touch_start_time = null
var touch_stop_time = null
var explore_by_touch = false
var tap_count = 0
func _input(event):
if event is InputEventScreenTouch:
get_tree().set_input_as_handled()
if touch_index and event.index != touch_index:
return
if event.pressed:
touch_index = event.index
touch_position = event.position
touch_start_time = OS.get_ticks_msec()
touch_stop_time = null
else:
touch_index = null
var relative = event.position - touch_position
if relative.length() < min_swipe_distance:
tap_count += 1
elif not explore_by_touch:
if abs(relative.x) > abs(relative.y):
if relative.x > 0:
emit_signal("swipe_right")
else:
emit_signal("swipe_left")
else:
if relative.y > 0:
emit_signal("swipe_down")
else:
emit_signal("swipe_up")
touch_position = null
touch_start_time = null
touch_stop_time = OS.get_ticks_msec()
explore_by_touch = false
elif event is InputEventScreenDrag:
if touch_index and event.index != touch_index:
return
if not explore_by_touch and OS.get_ticks_msec() - touch_start_time >= explore_by_touch_interval:
explore_by_touch = true
if event is InputEventMouseButton:
if event.device == -1 and not explore_by_touch:
get_tree().set_input_as_handled()
func _process(delta):
if touch_stop_time and OS.get_ticks_msec() - touch_stop_time >= tap_execute_interval and tap_count != 0:
touch_stop_time = null
if tap_count == 2:
press_and_release("ui_accept")
tap_count = 0
if focus_restore_timer and focus_restore_timer.time_left <= 0:
var focus = find_focusable_control(get_tree().root)
if focus and not focus.get_focus_owner():
print("Restoring focus.")
focus.grab_focus()
focus.grab_click_focus()