1 files changed, 117 insertions, 0 deletions
diff --git a/ui/pointer_input_sensor.gd b/ui/pointer_input_sensor.gd
new file mode 100644
index 0000000..f99fc17
--- /dev/null
+++ b/ui/pointer_input_sensor.gd
@@ -0,0 +1,117 @@
+extends Control
+class_name PointerInputSensor
+
+# All on_ACTION signals have a single argument of type PointerInputData.
+signal on_press
+signal on_release
+#signal on_release_outside
+signal on_click
+signal on_enter
+signal on_exit
+#signal on_exit_app_window
+signal on_begin_drag
+signal on_drag
+signal on_end_drag
+signal on_scroll
+
+enum PointerInputAction {
+	UNDEFINED,
+	ON_PRESS,
+	ON_RELEASE,
+#	ON_RELEASE_OUTSIDE,
+	ON_CLICK,
+	ON_ENTER,
+	ON_EXIT,
+#	ON_EXIT_APP_WINDOW,
+	ON_BEGIN_DRAG,
+	ON_DRAG,
+	ON_END_DRAG,
+	ON_SCROLL,
+}
+
+class PointerInputData:
+	var target: PointerInputSensor
+	var event: InputEvent
+	var index := -1
+	var initial_position := Vector2.ZERO
+	var current_position := Vector2.ZERO
+	var relative_position := Vector2.ZERO
+	var velocity := Vector2.ZERO
+	var was_dragged := false
+	var is_pressed := false
+	var scroll := 0.0
+	var action: int = PointerInputAction.UNDEFINED
+
+
+export var drag_threshold_cm: float = 0.250
+
+var pointer: PointerInputData
+
+onready var screen_dpcm := float(OS.get_screen_dpi()) / 2.54
+
+
+func _ready():
+	pointer = PointerInputData.new()
+	pointer.target = self
+	connect("mouse_entered", self, "_on_enter_exit", [true])
+	connect("mouse_exited", self, "_on_enter_exit", [false])
+
+
+func _on_enter_exit(is_inside: bool):
+	pointer.action = PointerInputAction.ON_ENTER if is_inside else PointerInputAction.ON_EXIT
+	emit_signal("on_enter" if is_inside else "on_exit", pointer)
+
+
+func _gui_input(event: InputEvent):
+	
+	# @DAM A bug on GODOT-3.X makes events from non-mouse-emulated pointers (index > 0) unreliable.
+	if event is InputEventScreenTouch || event is InputEventScreenDrag:
+		if event.index != 0:
+			return
+	
+	pointer.event = event
+	pointer.action = PointerInputAction.UNDEFINED
+	pointer.velocity = Vector2.ZERO
+	pointer.relative_position = Vector2.ZERO
+	pointer.scroll = 0.0
+	pointer.current_position = get_global_mouse_position()
+	
+	if event is InputEventScreenTouch && (pointer.is_pressed == false || pointer.index == event.index):
+		var touch := event as InputEventScreenTouch
+		pointer.is_pressed = event.pressed
+		
+		if pointer.is_pressed:
+			pointer.index = touch.index
+			pointer.initial_position = pointer.current_position
+			pointer.action = PointerInputAction.ON_PRESS
+			emit_signal("on_press", pointer)
+		else:
+			pointer.action = PointerInputAction.ON_RELEASE
+			emit_signal("on_release", pointer)
+			if pointer.was_dragged == false:
+				pointer.action = PointerInputAction.ON_CLICK
+				emit_signal("on_click", pointer)
+			else:
+				pointer.action = PointerInputAction.ON_END_DRAG
+				emit_signal("on_end_drag", pointer)
+			pointer.index = -1
+			pointer.was_dragged = false
+	
+	if event is InputEventScreenDrag && event.index == pointer.index:
+		var drag := event as InputEventScreenDrag
+		pointer.velocity = drag.speed
+		pointer.relative_position = drag.relative
+		if pointer.was_dragged == false && pointer.current_position.distance_to(pointer.initial_position) > drag_threshold_cm * screen_dpcm:
+			pointer.was_dragged = true
+			pointer.action = PointerInputAction.ON_BEGIN_DRAG
+			emit_signal("on_begin_drag", pointer)
+		pointer.action = PointerInputAction.ON_DRAG
+		emit_signal("on_drag", pointer)
+	
+	if event is InputEventMouseButton && event.is_pressed():
+		if event.button_index == BUTTON_WHEEL_UP || event.button_index == BUTTON_WHEEL_DOWN:
+			pointer.scroll = -1.0 if event.button_index == BUTTON_WHEEL_UP else 1.0
+			pointer.action = PointerInputAction.ON_SCROLL
+			emit_signal("on_scroll", pointer)
+
+