Move MorseState into autoload

Before this every instance of the MorseBanner had its own state, but as
we want to use the state also for other purposes, it doesn't make sense
to keep it in each instance. Therefore we now have an autoload that
keeps the state as a singleton. The MorseBanner now gets its state from
the autoload, so no more communication is needed between the main part
and the MorseBanner.

autoloads/morse_state.gd

@@ -0,0 +1,20 @@
+extends Node
+
+var states: Array[int] = []
+var curr_state := false
+var last_change: int = 0
+var start_time := 0
+
+func reset() -> void:
+	last_change = Time.get_ticks_msec()
+	start_time = last_change
+	states = []
+
+func set_state(state: bool) -> void:
+	if state == curr_state:
+		return
+	curr_state = state
+	
+	var now := Time.get_ticks_msec()
+	states.push_front(now - last_change)
+	last_change = now

project.godot

@@ -16,6 +16,10 @@ config/features=PackedStringArray("4.3", "Mobile")
 run/max_fps=120
 config/icon="res://icon.svg"
 
+[autoload]
+
+MorseState="*res://autoloads/morse_state.gd"
+
 [rendering]
 
 renderer/rendering_method="mobile"

scenes/MorseBanner.tscn

@@ -11,6 +11,3 @@ anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
 script = ExtResource("1_475pl")
-
-[connection signal="reset_buffer" from="." to="." method="_on_reset_buffer"]
-[connection signal="set_state" from="." to="." method="_on_set_state"]

scenes/main.gd

@@ -29,9 +29,7 @@ func _ready():
 	print(OS.get_connected_midi_inputs())
 
 func set_morse_state(state: bool):
-	%MorseBanner.set_state.emit(state)
-	%MorseBannerMedium.set_state.emit(state)
-	%MorseBannerSlow.set_state.emit(state)
+	MorseState.set_state(state)
 	morse_state = state
 	if state:
 		%ColorRect.color = Color(0, 128, 0)

scenes/morse_banner.gd

@@ -1,22 +1,13 @@
 extends Control
 
-signal set_state(state: bool)
-signal reset_buffer()
-
 var color_on := Color(0, 128, 0)
 var color_off := Color(0, 0, 0)
-var curr_state := false
 var last_delta := 0.0
 @export_range(0.1, 120.0) var display_sec := 5.0
 @export var stretch_display := false
-var start_time := 0
-var last_state_change_time: int = 0
+
 var morse_step_perc := 0.45
 
-var morse_states: Array[int] = []
-
-func _ready():
-	_on_reset_buffer()
 
 func _draw_morse_rect(x: float, width: float, state: bool):
 	var rect := Rect2(max(x, 0.0), morse_step_perc * size.y, width, (0.5 - morse_step_perc) * size.y)
@@ -26,17 +17,17 @@ func _draw():
 	# black background
 	draw_rect(Rect2(0.0, 0.0, size.x, size.y), Color.BLACK)
 	
-	var morse_on := curr_state
-	var first_time := Time.get_ticks_msec() - last_state_change_time
+	var morse_on := MorseState.curr_state
+	var first_time := Time.get_ticks_msec() - MorseState.last_change
 	var curr_x := float(size.x)
 	
 	var px_per_s := 0.0
 	if not stretch_display:
 		px_per_s = size.x / display_sec
 	else:
-		px_per_s = size.x / (Time.get_ticks_msec() - start_time) * 1000.0
+		px_per_s = size.x / (Time.get_ticks_msec() - MorseState.start_time) * 1000.0
 	
-	for duration in [first_time] + morse_states:
+	for duration in [first_time] + MorseState.states:
 		var rect_width: float = min(duration / 1000.0 * px_per_s, curr_x)
 		curr_x -= rect_width
 		if morse_on:
@@ -49,18 +40,3 @@ func _draw():
 func _process(_delta):
 	last_delta += _delta
 	queue_redraw()
-	
-func _on_set_state(state: bool) -> void:
-	if state == curr_state:
-		return
-	curr_state = state
-	
-	var now := Time.get_ticks_msec()
-	morse_states.push_front(now - last_state_change_time)
-	last_state_change_time = now
-
-
-func _on_reset_buffer() -> void:
-	last_state_change_time = Time.get_ticks_msec()
-	start_time = last_state_change_time
-	morse_states = []