Improve UndoRedo class

core/object/undo_redo.cpp

@@ -53,6 +53,23 @@ void UndoRedo::_discard_redo() {
 	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("version_changed");
+
+	return true;
+}
+
 void UndoRedo::create_action(const String &p_name, MergeMode p_mode) {
 	uint32_t ticks = OS::get_singleton()->get_ticks_msec();
 
@@ -242,7 +259,7 @@ bool UndoRedo::is_committing_action() const {
 	return committing > 0;
 }
 
-void UndoRedo::commit_action() {
+void UndoRedo::commit_action(bool p_execute) {
 	ERR_FAIL_COND(action_level <= 0);
 	action_level--;
 	if (action_level > 0) {
@@ -255,8 +272,9 @@ void UndoRedo::commit_action() {
 	}
 
 	committing++;
-	redo(); // perform action
+	_redo(p_execute); // perform action
 	committing--;
+
 	if (callback && actions.size() > 0) {
 		callback(callback_ud, actions[actions.size() - 1].name);
 	}
@@ -323,19 +341,7 @@ void UndoRedo::_process_operation_list(List<Operation>::Element *E) {
 }
 
 bool UndoRedo::redo() {
-	ERR_FAIL_COND_V(action_level > 0, false);
-
-	if ((current_action + 1) >= actions.size()) {
-		return false; //nothing to redo
-	}
-
-	current_action++;
-
-	_process_operation_list(actions.write[current_action].do_ops.front());
-	version++;
-	emit_signal("version_changed");
-
-	return true;
+	return _redo(true);
 }
 
 bool UndoRedo::undo() {
@@ -351,6 +357,24 @@ bool UndoRedo::undo() {
 	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();
@@ -480,7 +504,7 @@ Variant UndoRedo::_add_undo_method(const Variant **p_args, int p_argcount, Calla
 
 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"), &UndoRedo::commit_action);
+	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);
 
 	{
@@ -505,8 +529,14 @@ void UndoRedo::_bind_methods() {
 	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("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"), &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);

core/object/undo_redo.h

@@ -84,6 +84,7 @@ private:
 	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;
@@ -109,11 +110,15 @@ public:
 	void add_undo_reference(Object *p_object);
 
 	bool is_committing_action() const;
-	void commit_action();
+	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();

doc/classes/UndoRedo.xml

@@ -110,8 +110,10 @@
 		<method name="commit_action">
 			<return type="void">
 			</return>
+			<argument index="0" name="execute" type="bool" default="true">
+			</argument>
 			<description>
-				Commit the action. All "do" methods/properties are called/set when this function is called.
+				Commit the action. If [code]execute[/code] is true (default), all "do" methods/properties are called/set when this function is called.
 			</description>
 		</method>
 		<method name="create_action">
@@ -126,11 +128,34 @@
 				The way actions are merged is dictated by the [code]merge_mode[/code] argument. See [enum MergeMode] for details.
 			</description>
 		</method>
+		<method name="get_action_name">
+			<return type="String">
+			</return>
+			<argument index="0" name="arg0" type="int">
+			</argument>
+			<description>
+				Gets the action name from its index.
+			</description>
+		</method>
+		<method name="get_current_action">
+			<return type="int">
+			</return>
+			<description>
+				Gets the index of the current action.
+			</description>
+		</method>
 		<method name="get_current_action_name" qualifiers="const">
 			<return type="String">
 			</return>
 			<description>
-				Gets the name of the current action.
+				Gets the name of the current action, equivalent to [code]get_action_name(get_current_action())[/code].
+			</description>
+		</method>
+		<method name="get_history_count">
+			<return type="int">
+			</return>
+			<description>
+				Return how many element are in the history.
 			</description>
 		</method>
 		<method name="get_version" qualifiers="const">