Initial commit

Half-baked state. Most of the UI is mostly done, but the integration
with Grist (or any other data provider) is still missing.

addons/onscreenkeyboard/keyboard_layout.gd

@@ -0,0 +1,51 @@
+class_name KeyboardLayout
+
+extends Node
+
+var data:Dictionary = {}
+
+
+func generate_character_data(char:String) -> Dictionary:
+	if char == "":
+		return {}
+	char = char.to_upper()
+
+	data = {
+		"type": "char",
+		"output": char,
+		"display": char.to_lower(),
+	}
+	# if uppercase != lowercase
+	if char != char.to_lower():
+		data["display-uppercase"] = char
+	return data
+
+
+func generate_characters_data(chars:String) -> Array:
+	var keys = []
+	for char in chars.split(""):
+		var data = generate_character_data(char)
+		if data != {}:
+			keys.append(data)
+	return keys
+
+
+func set_special(keys):
+	for key in keys:
+		if !("type" in key):
+			key["type"] = "special"
+
+
+func make_row(left_special_keys: Array, chars: String, right_special_keys: Array):
+	set_special(left_special_keys)
+	set_special(right_special_keys)
+
+	var keys = left_special_keys
+	var data = generate_characters_data(chars)
+	if data != []:
+		keys.append_array(data)
+	if right_special_keys != []:
+		keys.append_array(right_special_keys)
+	return {
+		"keys": keys
+	}