Added a new InputMapEditor. I took the ProjectSettingsEditor and started refactoring it. Not yet finished.

SCsub

@@ -4,3 +4,5 @@ env.add_source_files(env.modules_sources,"register_types.cpp")
 
 env.add_source_files(env.modules_sources,"touch_button.cpp")
 env.add_source_files(env.modules_sources,"bs_input_event_key.cpp")
+
+env.add_source_files(env.modules_sources,"input_map_editor.cpp")

input_map_editor.h

@@ -0,0 +1,120 @@
+/*************************************************************************/
+/*  originally project_settings_editor.h                                 */
+/*************************************************************************/
+/*                This file is (originally) the part of:                 */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* 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.                */
+/*************************************************************************/
+
+#ifndef INPUT_MAP_EDITOR_H
+#define INPUT_MAP_EDITOR_H
+
+#include "scene/gui/dialogs.h"
+#include "scene/gui/menu_button.h"
+#include "scene/gui/option_button.h"
+#include "scene/gui/popup_menu.h"
+#include "scene/gui/tab_container.h"
+#include "scene/gui/tree.h"
+
+class InputMapEditor : public AcceptDialog {
+
+	GDCLASS(InputMapEditor, AcceptDialog);
+
+	enum InputType {
+		INPUT_KEY,
+		INPUT_JOY_BUTTON,
+		INPUT_JOY_MOTION,
+		INPUT_MOUSE_BUTTON
+	};
+
+	enum LocaleFilter {
+		SHOW_ALL_LOCALES,
+		SHOW_ONLY_SELECTED_LOCALES,
+	};
+
+	TabContainer *tab_container;
+
+	Timer *timer;
+	InputType add_type;
+	String add_at;
+	int edit_idx;
+
+	AcceptDialog *message;
+	LineEdit *category;
+	LineEdit *property;
+	OptionButton *type;
+	PopupMenu *popup_add;
+	ConfirmationDialog *press_a_key;
+	Label *press_a_key_label;
+	ConfirmationDialog *device_input;
+	OptionButton *device_id;
+	OptionButton *device_index;
+	Label *device_index_label;
+
+	Tree *input_editor;
+	bool setting;
+
+	Ref<InputEventKey> last_wait_for_key;
+
+	void _update_actions();
+	void _save();
+	void _add_item(int p_item, Ref<InputEvent> p_exiting_event = NULL);
+	void _edit_item(Ref<InputEvent> p_exiting_event);
+
+	void _device_input_add();
+
+	void _item_checked(const String &p_item, bool p_check);
+	void _action_selected();
+	void _action_edited();
+	void _action_activated();
+	void _action_button_pressed(Object *p_obj, int p_column, int p_id);
+	void _wait_for_key(const Ref<InputEvent> &p_event);
+	void _press_a_key_confirm();
+	void _show_last_added(const Ref<InputEvent> &p_event, const String &p_name);
+
+	void _settings_prop_edited(const String &p_name);
+	void _settings_changed();
+
+	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
+	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
+	void drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from);
+
+protected:
+	void _notification(int p_what);
+	static void _bind_methods();
+
+	int _get_current_device();
+	void _set_current_device(int i_device);
+	String _get_device_string(int i_device);
+
+public:
+	TabContainer *get_tabs();
+
+	void queue_save();
+
+	InputMapEditor();
+};
+
+#endif // PROJECT_SETTINGS_H

register_types.cpp

@@ -23,11 +23,13 @@ SOFTWARE.
 #include "register_types.h"
 
 #include "bs_input_event_key.h"
+#include "input_map_editor.h"
 #include "touch_button.h"
 
 void register_ui_extensions_types() {
 	ClassDB::register_class<TouchButton>();
 	ClassDB::register_class<BSInputEventKey>();
+	ClassDB::register_class<InputMapEditor>();
 }
 
 void unregister_ui_extensions_types() {