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/*************************************************************************/
/* undo_redo.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 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 UNDO_REDO_H
#define UNDO_REDO_H
#include "core/object/class_db.h"
#include "core/object/ref_counted.h"
class UndoRedo : public Object {
GDCLASS(UndoRedo, Object);
OBJ_SAVE_TYPE(UndoRedo);
public:
enum MergeMode {
MERGE_DISABLE,
MERGE_ENDS,
MERGE_ALL
};
typedef void (*CommitNotifyCallback)(void *p_ud, const String &p_name);
Variant _add_do_method(const Variant **p_args, int p_argcount, Callable::CallError &r_error);
Variant _add_undo_method(const Variant **p_args, int p_argcount, Callable::CallError &r_error);
typedef void (*MethodNotifyCallback)(void *p_ud, Object *p_base, const StringName &p_name, VARIANT_ARG_DECLARE);
typedef void (*PropertyNotifyCallback)(void *p_ud, Object *p_base, const StringName &p_property, const Variant &p_value);
private:
struct Operation {
enum Type {
TYPE_METHOD,
TYPE_PROPERTY,
TYPE_REFERENCE
};
Type type;
Ref<RefCounted> ref;
ObjectID object;
StringName name;
Variant args[VARIANT_ARG_MAX];
};
struct Action {
String name;
List<Operation> do_ops;
List<Operation> undo_ops;
uint64_t last_tick;
};
Vector<Action> actions;
int current_action = -1;
int action_level = 0;
MergeMode merge_mode = MERGE_DISABLE;
bool merging = false;
uint64_t version = 1;
void _pop_history_tail();
void _process_operation_list(List<Operation>::Element *E);
void _discard_redo();
bool _redo(bool p_execute);
CommitNotifyCallback callback = nullptr;
void *callback_ud = nullptr;
void *method_callbck_ud = nullptr;
void *prop_callback_ud = nullptr;
MethodNotifyCallback method_callback = nullptr;
PropertyNotifyCallback property_callback = nullptr;
int committing = 0;
protected:
static void _bind_methods();
public:
void create_action(const String &p_name = "", MergeMode p_mode = MERGE_DISABLE);
void add_do_method(Object *p_object, const StringName &p_method, VARIANT_ARG_LIST);
void add_undo_method(Object *p_object, const StringName &p_method, VARIANT_ARG_LIST);
void add_do_property(Object *p_object, const StringName &p_property, const Variant &p_value);
void add_undo_property(Object *p_object, const StringName &p_property, const Variant &p_value);
void add_do_reference(Object *p_object);
void add_undo_reference(Object *p_object);
bool is_committing_action() const;
void commit_action(bool p_execute = true);
bool redo();
bool undo();
String get_current_action_name() const;
int get_history_count();
int get_current_action();
String get_action_name(int p_id);
void clear_history(bool p_increase_version = true);
bool has_undo();
bool has_redo();
uint64_t get_version() const;
void set_commit_notify_callback(CommitNotifyCallback p_callback, void *p_ud);
void set_method_notify_callback(MethodNotifyCallback p_method_callback, void *p_ud);
void set_property_notify_callback(PropertyNotifyCallback p_property_callback, void *p_ud);
UndoRedo() {}
~UndoRedo();
};
VARIANT_ENUM_CAST(UndoRedo::MergeMode);
#endif // UNDO_REDO_H
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