On delete node or component event

[sityrax]

Здравствуйте! Есть ли где-нибудь событие или функция обратного вызова типа Update или Init, которое позволило бы узнать, что нода или компонент были удалены (например методом DeleteForce, DeleteLater или перезагрузкой мира)?

[Amerio.Stephane]

Hi, you can implement the shutdown method of a custom component, and then add this component to the node which destruction you want to monitor.

#pragma once
#include <UnigineComponentSystem.h>
#include <plugins/Unigine/IG/UnigineIG.h>
#include <plugins/Unigine/IG/UnigineIGNetwork.h>

/** 
* The sole purpose of this component is to have a callback called when this component is shutdown.
* This can be useful if you need to be alerted when a node is being destroyed.
*/
class ShutdownComponent :
	public Unigine::Plugins::IG::NetworkComponentBase
{
public:
	COMPONENT(ShutdownComponent, Unigine::Plugins::IG::NetworkComponentBase);
	COMPONENT_SHUTDOWN(shutdown);

	void shutdown();

	void setCallback(Unigine::CallbackBase* callback) { this->callback = callback; }
	Unigine::CallbackBase* getCallback() const { return callback; }

	PROP_NAME("ShutdownComponent");
	PROP_PARAM(String, message, "", "Message", "If not empty, logs this message when the component is shut down");

private:
	Unigine::CallbackBase* callback = nullptr;
};

 

#include "ShutdownComponent.h"

using namespace Unigine;

REGISTER_COMPONENT(ShutdownComponent)

void ShutdownComponent::shutdown()
{
	String msg = message.get();
	if (!msg.empty())
		Log::message("%s", msg.get());
	if (callback)
		callback->run();
}

 

[sityrax]

@Amerio.Stephane, Thanks for the answer! Apparently, i will use this solution.

I also found static method:

 Node.AddCallback(Node.CALLBACK_INDEX.NODE_REMOVE, OnDestroy);

But when node destroy event occured, unigine crashed with the message:

"Unigine fatal error d:\ba\work\fb3821776bc41fe5\include\UnigineCallback.h:115: Assertion: '0 && 'Unigine::CallbackBase::run(): wrong size''"

 

The documentation provides another event in Node instance API: 

Event<Node> EventNodeRemove

But i can't find it in 2.17.

Edited November 17 by sityrax