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godot/core/object/undo_redo.cpp

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/*************************************************************************/
/* undo_redo.cpp */
/*************************************************************************/
/* 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. */
/*************************************************************************/
#include "undo_redo.h"
#include "core/io/resource.h"
#include "core/os/os.h"
#include "core/templates/local_vector.h"
void UndoRedo::_discard_redo() {
if (current_action == actions.size() - 1) {
return;
}
for (int i = current_action + 1; i < actions.size(); i++) {
for (Operation &E : actions.write[i].do_ops) {
if (E.type == Operation::TYPE_REFERENCE) {
if (E.ref.is_valid()) {
E.ref.unref();
} else {
Object *obj = ObjectDB::get_instance(E.object);
if (obj) {
memdelete(obj);
}
}
}
}
//ERASE do data
}
actions.resize(current_action + 1);
}
bool UndoRedo::_redo(bool p_execute) {
ERR_FAIL_COND_V(action_level > 0, false);
if ((current_action + 1) >= actions.size()) {
return false; //nothing to redo
}
current_action++;
if (p_execute) {
_process_operation_list(actions.write[current_action].do_ops.front());
}
version++;
emit_signal(SNAME("version_changed"));
return true;
}
void UndoRedo::create_action(const String &p_name, MergeMode p_mode) {
uint32_t ticks = OS::get_singleton()->get_ticks_msec();
if (action_level == 0) {
_discard_redo();
// Check if the merge operation is valid
if (p_mode != MERGE_DISABLE && actions.size() && actions[actions.size() - 1].name == p_name && actions[actions.size() - 1].last_tick + 800 > ticks) {
current_action = actions.size() - 2;
if (p_mode == MERGE_ENDS) {
// Clear all do ops from last action if they are not forced kept
LocalVector<List<Operation>::Element *> to_remove;
for (List<Operation>::Element *E = actions.write[current_action + 1].do_ops.front(); E; E = E->next()) {
if (!E->get().force_keep_in_merge_ends) {
to_remove.push_back(E);
}
}
for (unsigned int i = 0; i < to_remove.size(); i++) {
List<Operation>::Element *E = to_remove[i];
// Delete all object references
if (E->get().type == Operation::TYPE_REFERENCE) {
Object *obj = ObjectDB::get_instance(E->get().object);
if (obj) {
memdelete(obj);
}
}
E->erase();
}
}
actions.write[actions.size() - 1].last_tick = ticks;
merge_mode = p_mode;
merging = true;
} else {
Action new_action;
new_action.name = p_name;
new_action.last_tick = ticks;
actions.push_back(new_action);
merge_mode = MERGE_DISABLE;
}
}
action_level++;
force_keep_in_merge_ends = false;
}
void UndoRedo::add_do_method(Object *p_object, const StringName &p_method, VARIANT_ARG_DECLARE) {
VARIANT_ARGPTRS
ERR_FAIL_COND(p_object == nullptr);
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
Operation do_op;
do_op.object = p_object->get_instance_id();
if (Object::cast_to<RefCounted>(p_object)) {
do_op.ref = Ref<RefCounted>(Object::cast_to<RefCounted>(p_object));
}
do_op.type = Operation::TYPE_METHOD;
do_op.name = p_method;
for (int i = 0; i < VARIANT_ARG_MAX; i++) {
do_op.args[i] = *argptr[i];
}
actions.write[current_action + 1].do_ops.push_back(do_op);
}
void UndoRedo::add_undo_method(Object *p_object, const StringName &p_method, VARIANT_ARG_DECLARE) {
VARIANT_ARGPTRS
ERR_FAIL_COND(p_object == nullptr);
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
// No undo if the merge mode is MERGE_ENDS
if (!force_keep_in_merge_ends && merge_mode == MERGE_ENDS) {
return;
}
Operation undo_op;
undo_op.object = p_object->get_instance_id();
if (Object::cast_to<RefCounted>(p_object)) {
undo_op.ref = Ref<RefCounted>(Object::cast_to<RefCounted>(p_object));
}
undo_op.type = Operation::TYPE_METHOD;
undo_op.force_keep_in_merge_ends = force_keep_in_merge_ends;
undo_op.name = p_method;
for (int i = 0; i < VARIANT_ARG_MAX; i++) {
undo_op.args[i] = *argptr[i];
}
actions.write[current_action + 1].undo_ops.push_back(undo_op);
}
void UndoRedo::add_do_property(Object *p_object, const StringName &p_property, const Variant &p_value) {
ERR_FAIL_COND(p_object == nullptr);
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
Operation do_op;
do_op.object = p_object->get_instance_id();
if (Object::cast_to<RefCounted>(p_object)) {
do_op.ref = Ref<RefCounted>(Object::cast_to<RefCounted>(p_object));
}
do_op.type = Operation::TYPE_PROPERTY;
do_op.name = p_property;
do_op.args[0] = p_value;
actions.write[current_action + 1].do_ops.push_back(do_op);
}
void UndoRedo::add_undo_property(Object *p_object, const StringName &p_property, const Variant &p_value) {
ERR_FAIL_COND(p_object == nullptr);
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
// No undo if the merge mode is MERGE_ENDS
if (!force_keep_in_merge_ends && merge_mode == MERGE_ENDS) {
return;
}
Operation undo_op;
undo_op.object = p_object->get_instance_id();
if (Object::cast_to<RefCounted>(p_object)) {
undo_op.ref = Ref<RefCounted>(Object::cast_to<RefCounted>(p_object));
}
undo_op.type = Operation::TYPE_PROPERTY;
undo_op.force_keep_in_merge_ends = force_keep_in_merge_ends;
undo_op.name = p_property;
undo_op.args[0] = p_value;
actions.write[current_action + 1].undo_ops.push_back(undo_op);
}
void UndoRedo::add_do_reference(Object *p_object) {
ERR_FAIL_COND(p_object == nullptr);
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
Operation do_op;
do_op.object = p_object->get_instance_id();
if (Object::cast_to<RefCounted>(p_object)) {
do_op.ref = Ref<RefCounted>(Object::cast_to<RefCounted>(p_object));
}
do_op.type = Operation::TYPE_REFERENCE;
actions.write[current_action + 1].do_ops.push_back(do_op);
}
void UndoRedo::add_undo_reference(Object *p_object) {
ERR_FAIL_COND(p_object == nullptr);
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
// No undo if the merge mode is MERGE_ENDS
if (!force_keep_in_merge_ends && merge_mode == MERGE_ENDS) {
return;
}
Operation undo_op;
undo_op.object = p_object->get_instance_id();
if (Object::cast_to<RefCounted>(p_object)) {
undo_op.ref = Ref<RefCounted>(Object::cast_to<RefCounted>(p_object));
}
undo_op.type = Operation::TYPE_REFERENCE;
undo_op.force_keep_in_merge_ends = force_keep_in_merge_ends;
actions.write[current_action + 1].undo_ops.push_back(undo_op);
}
void UndoRedo::start_force_keep_in_merge_ends() {
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
force_keep_in_merge_ends = true;
}
void UndoRedo::end_force_keep_in_merge_ends() {
ERR_FAIL_COND(action_level <= 0);
ERR_FAIL_COND((current_action + 1) >= actions.size());
force_keep_in_merge_ends = false;
}
void UndoRedo::_pop_history_tail() {
_discard_redo();
if (!actions.size()) {
return;
}
for (Operation &E : actions.write[0].undo_ops) {
if (E.type == Operation::TYPE_REFERENCE) {
if (E.ref.is_valid()) {
E.ref.unref();
} else {
Object *obj = ObjectDB::get_instance(E.object);
if (obj) {
memdelete(obj);
}
}
}
}
actions.remove(0);
if (current_action >= 0) {
current_action--;
}
}
bool UndoRedo::is_committing_action() const {
return committing > 0;
}
void UndoRedo::commit_action(bool p_execute) {
ERR_FAIL_COND(action_level <= 0);
action_level--;
if (action_level > 0) {
return; //still nested
}
if (merging) {
version--;
merging = false;
}
committing++;
_redo(p_execute); // perform action
committing--;
if (callback && actions.size() > 0) {
callback(callback_ud, actions[actions.size() - 1].name);
}
}
void UndoRedo::_process_operation_list(List<Operation>::Element *E) {
for (; E; E = E->next()) {
Operation &op = E->get();
Object *obj = ObjectDB::get_instance(op.object);
if (!obj) { //may have been deleted and this is fine
continue;
}
switch (op.type) {
case Operation::TYPE_METHOD: {
Vector<const Variant *> argptrs;
argptrs.resize(VARIANT_ARG_MAX);
int argc = 0;
for (int i = 0; i < VARIANT_ARG_MAX; i++) {
if (op.args[i].get_type() == Variant::NIL) {
break;
}
argptrs.write[i] = &op.args[i];
argc++;
}
argptrs.resize(argc);
Callable::CallError ce;
obj->call(op.name, (const Variant **)argptrs.ptr(), argc, ce);
if (ce.error != Callable::CallError::CALL_OK) {
ERR_PRINT("Error calling method from signal '" + String(op.name) + "': " + Variant::get_call_error_text(obj, op.name, (const Variant **)argptrs.ptr(), argc, ce));
}
#ifdef TOOLS_ENABLED
Resource *res = Object::cast_to<Resource>(obj);
if (res) {
res->set_edited(true);
}
#endif
if (method_callback) {
method_callback(method_callbck_ud, obj, op.name, VARIANT_ARGS_FROM_ARRAY(op.args));
}
} break;
case Operation::TYPE_PROPERTY: {
obj->set(op.name, op.args[0]);
#ifdef TOOLS_ENABLED
Resource *res = Object::cast_to<Resource>(obj);
if (res) {
res->set_edited(true);
}
#endif
if (property_callback) {
property_callback(prop_callback_ud, obj, op.name, op.args[0]);
}
} break;
case Operation::TYPE_REFERENCE: {
//do nothing
} break;
}
}
}
bool UndoRedo::redo() {
return _redo(true);
}
bool UndoRedo::undo() {
ERR_FAIL_COND_V(action_level > 0, false);
if (current_action < 0) {
return false; //nothing to redo
}
_process_operation_list(actions.write[current_action].undo_ops.front());
current_action--;
version--;
emit_signal(SNAME("version_changed"));
return true;
}
int UndoRedo::get_history_count() {
ERR_FAIL_COND_V(action_level > 0, -1);
return actions.size();
}
int UndoRedo::get_current_action() {
ERR_FAIL_COND_V(action_level > 0, -1);
return current_action;
}
String UndoRedo::get_action_name(int p_id) {
ERR_FAIL_INDEX_V(p_id, actions.size(), "");
return actions[p_id].name;
}
void UndoRedo::clear_history(bool p_increase_version) {
ERR_FAIL_COND(action_level > 0);
_discard_redo();
while (actions.size()) {
_pop_history_tail();
}
if (p_increase_version) {
version++;
emit_signal(SNAME("version_changed"));
}
}
String UndoRedo::get_current_action_name() const {
ERR_FAIL_COND_V(action_level > 0, "");
if (current_action < 0) {
return "";
}
return actions[current_action].name;
}
bool UndoRedo::has_undo() const {
return current_action >= 0;
}
bool UndoRedo::has_redo() const {
return (current_action + 1) < actions.size();
}
uint64_t UndoRedo::get_version() const {
return version;
}
void UndoRedo::set_commit_notify_callback(CommitNotifyCallback p_callback, void *p_ud) {
callback = p_callback;
callback_ud = p_ud;
}
void UndoRedo::set_method_notify_callback(MethodNotifyCallback p_method_callback, void *p_ud) {
method_callback = p_method_callback;
method_callbck_ud = p_ud;
}
void UndoRedo::set_property_notify_callback(PropertyNotifyCallback p_property_callback, void *p_ud) {
property_callback = p_property_callback;
prop_callback_ud = p_ud;
}
UndoRedo::~UndoRedo() {
clear_history();
}
Variant UndoRedo::_add_do_method(const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
if (p_argcount < 2) {
r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
r_error.argument = 0;
return Variant();
}
if (p_args[0]->get_type() != Variant::OBJECT) {
r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
r_error.argument = 0;
r_error.expected = Variant::OBJECT;
return Variant();
}
if (p_args[1]->get_type() != Variant::STRING_NAME && p_args[1]->get_type() != Variant::STRING) {
r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
r_error.argument = 1;
r_error.expected = Variant::STRING_NAME;
return Variant();
}
r_error.error = Callable::CallError::CALL_OK;
Object *object = *p_args[0];
StringName method = *p_args[1];
Variant v[VARIANT_ARG_MAX];
for (int i = 0; i < MIN(VARIANT_ARG_MAX, p_argcount - 2); ++i) {
v[i] = *p_args[i + 2];
}
static_assert(VARIANT_ARG_MAX == 8, "This code needs to be updated if VARIANT_ARG_MAX != 8");
add_do_method(object, method, v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]);
return Variant();
}
Variant UndoRedo::_add_undo_method(const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
if (p_argcount < 2) {
r_error.error = Callable::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
r_error.argument = 0;
return Variant();
}
if (p_args[0]->get_type() != Variant::OBJECT) {
r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
r_error.argument = 0;
r_error.expected = Variant::OBJECT;
return Variant();
}
if (p_args[1]->get_type() != Variant::STRING_NAME && p_args[1]->get_type() != Variant::STRING) {
r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
r_error.argument = 1;
r_error.expected = Variant::STRING_NAME;
return Variant();
}
r_error.error = Callable::CallError::CALL_OK;
Object *object = *p_args[0];
StringName method = *p_args[1];
Variant v[VARIANT_ARG_MAX];
for (int i = 0; i < MIN(VARIANT_ARG_MAX, p_argcount - 2); ++i) {
v[i] = *p_args[i + 2];
}
static_assert(VARIANT_ARG_MAX == 8, "This code needs to be updated if VARIANT_ARG_MAX != 8");
add_undo_method(object, method, v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]);
return Variant();
}
void UndoRedo::_bind_methods() {
ClassDB::bind_method(D_METHOD("create_action", "name", "merge_mode"), &UndoRedo::create_action, DEFVAL(MERGE_DISABLE));
ClassDB::bind_method(D_METHOD("commit_action", "execute"), &UndoRedo::commit_action, DEFVAL(true));
ClassDB::bind_method(D_METHOD("is_committing_action"), &UndoRedo::is_committing_action);
{
MethodInfo mi;
mi.name = "add_do_method";
mi.arguments.push_back(PropertyInfo(Variant::OBJECT, "object"));
mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "method"));
ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "add_do_method", &UndoRedo::_add_do_method, mi, varray(), false);
}
{
MethodInfo mi;
mi.name = "add_undo_method";
mi.arguments.push_back(PropertyInfo(Variant::OBJECT, "object"));
mi.arguments.push_back(PropertyInfo(Variant::STRING_NAME, "method"));
ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "add_undo_method", &UndoRedo::_add_undo_method, mi, varray(), false);
}
ClassDB::bind_method(D_METHOD("add_do_property", "object", "property", "value"), &UndoRedo::add_do_property);
ClassDB::bind_method(D_METHOD("add_undo_property", "object", "property", "value"), &UndoRedo::add_undo_property);
ClassDB::bind_method(D_METHOD("add_do_reference", "object"), &UndoRedo::add_do_reference);
ClassDB::bind_method(D_METHOD("add_undo_reference", "object"), &UndoRedo::add_undo_reference);
ClassDB::bind_method(D_METHOD("start_force_keep_in_merge_ends"), &UndoRedo::start_force_keep_in_merge_ends);
ClassDB::bind_method(D_METHOD("end_force_keep_in_merge_ends"), &UndoRedo::end_force_keep_in_merge_ends);
ClassDB::bind_method(D_METHOD("get_history_count"), &UndoRedo::get_history_count);
ClassDB::bind_method(D_METHOD("get_current_action"), &UndoRedo::get_current_action);
ClassDB::bind_method(D_METHOD("get_action_name", "id"), &UndoRedo::get_action_name);
ClassDB::bind_method(D_METHOD("clear_history", "increase_version"), &UndoRedo::clear_history, DEFVAL(true));
ClassDB::bind_method(D_METHOD("get_current_action_name"), &UndoRedo::get_current_action_name);
ClassDB::bind_method(D_METHOD("has_undo"), &UndoRedo::has_undo);
ClassDB::bind_method(D_METHOD("has_redo"), &UndoRedo::has_redo);
ClassDB::bind_method(D_METHOD("get_version"), &UndoRedo::get_version);
ClassDB::bind_method(D_METHOD("redo"), &UndoRedo::redo);
ClassDB::bind_method(D_METHOD("undo"), &UndoRedo::undo);
ADD_SIGNAL(MethodInfo("version_changed"));
BIND_ENUM_CONSTANT(MERGE_DISABLE);
BIND_ENUM_CONSTANT(MERGE_ENDS);
BIND_ENUM_CONSTANT(MERGE_ALL);
}
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