Now tab containers are also navigable with keys in the menu.

game/menu/Menu.gd

@@ -1,4 +1,3 @@
-
 extends Control
 class_name Menu
 

game/project.godot

@@ -713,6 +713,26 @@ jump={
 "events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":32,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
  ]
 }
+ui_prev_page={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777244,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+ ]
+}
+ui_next_page={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777245,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+ ]
+}
+ui_prev_page_2={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777254,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+ ]
+}
+ui_next_page_2={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777255,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+ ]
+}
 
 [layer_names]
 

game/scenes/Main.tscn

@@ -63,7 +63,7 @@ Broken Seals
 
 [wave]LOADING[/wave]
 [/center]"
-text = "[center]
+text = "
 
 
 
@@ -90,7 +90,7 @@ Broken Seals
 
 
 
-[wave]LOADING[/wave]
+LOADING
-[/center]"
+"
 
 [node name="DebugInfo" parent="." instance=ExtResource( 5 )]

game/ui/KeyboardTabContainer.gd

@@ -0,0 +1,60 @@
+extends TabContainer
+
+# Copyright (c) 2019-2021 Péter Magyar
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+export(NodePath) var focus_control_on_tab_change_path : NodePath
+
+export(String) var prev_tab_action : String = "ui_prev_page"
+export(String) var next_tab_action : String = "ui_next_page"
+
+var _focus_control_on_tab_change : Control = null
+
+func _ready():
+	_focus_control_on_tab_change = get_node(focus_control_on_tab_change_path) as Control
+	
+	connect("visibility_changed", self, "on_visibility_changed")
+	on_visibility_changed()
+
+func _input(event : InputEvent) -> void:
+	if event.is_action_pressed(next_tab_action, false):
+		var oct : int = current_tab
+		
+		current_tab += 1
+		
+		if current_tab != oct:
+			_focus_control_on_tab_change.grab_focus()
+			
+		get_tree().set_input_as_handled()
+	elif event.is_action_pressed(prev_tab_action, false):
+		var oct : int = current_tab
+		
+		current_tab -= 1
+		
+		if current_tab != oct:
+			_focus_control_on_tab_change.grab_focus()
+			
+		get_tree().set_input_as_handled()
+
+func on_visibility_changed() -> void:
+	if is_visible_in_tree():
+		set_process_input(true)
+	else:
+		set_process_input(false)

game/ui/about/About.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=9 format=2]
+[gd_scene load_steps=10 format=2]
 
 [ext_resource path="res://ui/about/GodotAuthors.gd" type="Script" id=1]
 [ext_resource path="res://ui/about/GodotDonors.gd" type="Script" id=2]
@@ -8,6 +8,7 @@
 [ext_resource path="res://ui/about/Authors.gd" type="Script" id=6]
 [ext_resource path="res://ui/about/Third-Party Licenses.gd" type="Script" id=7]
 [ext_resource path="res://ui/Window.gd" type="Script" id=8]
+[ext_resource path="res://ui/KeyboardTabContainer.gd" type="Script" id=9]
 
 [node name="About" type="Control"]
 anchor_right = 1.0
@@ -45,6 +46,8 @@ margin_bottom = 431.0
 size_flags_horizontal = 3
 size_flags_vertical = 3
 tab_align = 0
+script = ExtResource( 9 )
+focus_control_on_tab_change_path = NodePath("../Close")
 
 [node name="Authors" type="ScrollContainer" parent="PanelContainer/VBoxContainer/TabContainer"]
 anchor_right = 1.0
@@ -155,6 +158,10 @@ margin_right = -4.0
 margin_bottom = -4.0
 size_flags_horizontal = 3
 size_flags_vertical = 3
+script = ExtResource( 9 )
+focus_control_on_tab_change_path = NodePath("../../Close")
+prev_tab_action = "ui_prev_page_2"
+next_tab_action = "ui_next_page_2"
 
 [node name="Authors" type="ScrollContainer" parent="PanelContainer/VBoxContainer/TabContainer/Godot"]
 anchor_right = 1.0

game/ui/options/Options.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=9 format=2]
+[gd_scene load_steps=10 format=2]
 
 [ext_resource path="res://ui/theme/ui_theme.tres" type="Theme" id=1]
 [ext_resource path="res://ui/player_ui/RemoveProfile.gd" type="Script" id=2]
@@ -8,6 +8,7 @@
 [ext_resource path="res://ui/options/OptionEnumRow.tscn" type="PackedScene" id=6]
 [ext_resource path="res://ui/Window.gd" type="Script" id=7]
 [ext_resource path="res://ui/options/OptionsSpinboxRow.tscn" type="PackedScene" id=8]
+[ext_resource path="res://ui/KeyboardTabContainer.gd" type="Script" id=9]
 
 [node name="Options" type="Control"]
 anchor_right = 1.0
@@ -45,6 +46,8 @@ margin_bottom = 431.0
 size_flags_horizontal = 3
 size_flags_vertical = 3
 tab_align = 0
+script = ExtResource( 9 )
+focus_control_on_tab_change_path = NodePath("../Close")
 
 [node name="Video" type="VBoxContainer" parent="PanelContainer/VBoxContainer/TabContainer"]
 anchor_right = 1.0