1 files changed, 92 insertions, 0 deletions
diff --git a/src/helpers/text_fade.gd b/src/helpers/text_fade.gd
new file mode 100644
index 0000000..e83d59f
--- /dev/null
+++ b/src/helpers/text_fade.gd
@@ -0,0 +1,92 @@
+extends RichTextLabel
+
+export(PoolColorArray) var char_colors = PoolColorArray()
+export var fade_step_time = 0.1
+export var do_autostart = true
+export var char_delta = 1.0
+export var char_step = 0.01
+export var time_until_fadeout = 1.0
+
+var fade_timer
+var wait_timer
+var delta
+var current_max_index
+var last_index_delta
+var fadein
+
+func set_bbcode_opacity():
+	var new_bbcode = str("")
+	
+	for i in min(char_colors.size(), text.length()):
+		if i <= current_max_index:
+			if fadein == true:
+				char_colors[i].a = min(char_colors[i].a + char_step, 1.0)
+			else:
+				char_colors[i].a = max(char_colors[i].a - char_step, 0.0)
+		new_bbcode += "[color=#" + char_colors[i].to_html(true) + "]" + text[i] + "[/color]"
+
+	set_bbcode(new_bbcode)
+	
+	if char_colors[char_colors.size() - 1].a == 1.0 and fadein == true:
+		fade_timer.stop()
+		wait_timer.start()
+
+func set_next_char():
+	last_index_delta = delta
+	current_max_index = min(current_max_index + 1, text.length())
+
+func reset(_fadein = true):
+	delta = 0
+	current_max_index = 0
+	last_index_delta = delta
+	fadein = _fadein
+
+func _ready():
+	if char_colors.size() > text.length() or char_colors.size() == 0:
+		push_error (str(self.name) + ": Size of character colors more than the text length: " + str(char_colors.size()) + " > " + str(text.length()))
+		get_tree().quit(-1)
+
+	if char_colors.size() < text.length():
+		var i = char_colors.size() - 1
+		while i < text.length() - 1:
+			char_colors.append(char_colors[i])
+			i += 1
+
+	for i in char_colors.size():
+		char_colors[i].a = 0.0
+
+	current_max_index = -1
+	set_bbcode_opacity()
+	reset(true)
+	
+	fade_timer = Timer.new()
+	fade_timer.set_one_shot(false)
+	fade_timer.set_wait_time(fade_step_time)
+	fade_timer.set_autostart(do_autostart)
+	fade_timer.connect("timeout", self, "_fade_timer_callback")
+	add_child(fade_timer)
+
+	wait_timer = Timer.new()
+	wait_timer.set_one_shot(true)
+	wait_timer.set_wait_time(time_until_fadeout)
+	wait_timer.set_autostart(false)
+	wait_timer.connect("timeout", self, "_wait_timer_callback")
+	add_child(wait_timer)
+
+func _process(_delta):
+	delta += _delta
+
+func _fade_timer_callback():
+	if current_max_index >= 0:
+		if delta > last_index_delta + char_delta:
+			set_next_char()
+
+		set_bbcode_opacity()
+
+func _wait_timer_callback():
+	reset(false)
+	fade_timer.start()
+
+
+func _on_start_light_timeout():
+	fade_timer.start()