Problem with events...

[Nuker]

Hi @ll

I have a serious problem with the events in CEGUI ... it is no problem to register new handlers for events but i can't unsubscribe them ... I tried everything and searched the whole forum but I didn't find a solution ...

Here's a the piece of code I use .. don't worry, this code is only for testing ...

Code: Select all

// The eventName is always "MouseClick"

CEGUI::Event::ConnectionInterface* connection;

void thorGuiObject::SubscribeEvent( const char* eventName, const luabind::adl::object& luaFunc )
{
   connection = _targetWindow->subscribeEvent( eventName, CEGUI::Event::Subscriber( &thorGuiObject::HandleEvent, this )).get();
   LogManager::getSingleton().logMessage( "Subscribe" );
}

void thorGuiObject::UnsubscribeEvent( const char* eventName )
{
   connection->disconnect();
   
   //delete connection;

   LogManager::getSingleton().logMessage( "Unsubscribe" );
}

bool thorGuiObject::HandleEvent( const CEGUI::EventArgs& e )
{
   LogManager::getSingleton().logMessage( "Event handled" );

   UnsubscribeEvent( "MouseClick" );

   return true;
}


Everytime I want to unsubscribe I get an error message like this:



I don't know what to ... what am i doing wrong?? Please help me...

C YA - []Nuker

[CrazyEddie]

Hi,

The actual type that you should be using to store connections is:

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CEGUI::Event::Connection

And you hold the actual object, not a pointer to it. In actual fact 'CEGUI::Event::Connection' is a kind of light-weight container for the actual internal connection object, and these containers can be copied, assigned, and passed around freely.

So basically you need this kind of thing:

Code: Select all

CEGUI::Event::Connection connection;

void thorGuiObject::SubscribeEvent( const char* eventName, const luabind::adl::object& luaFunc )
{
   connection = _targetWindow->subscribeEvent( eventName, CEGUI::Event::Subscriber( &thorGuiObject::HandleEvent, this )).get();
   LogManager::getSingleton().logMessage( "Subscribe" );
}

void thorGuiObject::UnsubscribeEvent( const char* eventName )
{
   connection.disconnect();

   LogManager::getSingleton().logMessage( "Unsubscribe" );
}

bool thorGuiObject::HandleEvent( const CEGUI::EventArgs& e )
{
   LogManager::getSingleton().logMessage( "Event handled" );

   UnsubscribeEvent( "MouseClick" );

   return true;
}

HTH

CE.

[Nuker]

I tried it like you said but I get an compiler error

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connection.disconnect();

error C2039: 'disconnect' : is not a member of 'CEGUI::RefPtr<T>'
c:\projects\c++\thor\thorclient\thorclient\thorguiobject.cpp


I also tried

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connection.get()->disconnect();


But with this solution i get the same error message as shown in my first post.. but i'm using the latest (0.4.1) version of CEGUI ...

Strange...

C YA - []Nuker

[CrazyEddie]

Yeah, very sorry - my mistake

it should have been:

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connection->disconnect();

Even though connection is not a pointer type as such, as mentioned above it's a kind of container or "smart pointer", so the dereferencing operator is used.

CE.

[Nuker]

Still the same ... i always get the assertion failure ...

[Nuker]

I played a bit around and now I think I know where there failure came from:

I tried to close the Connection while i was inside the EventHandler.
My EventHandler function triggered the Unsubscribtion function ...

Hm... I think I must implement something like a queue where all connections are stored which should be closed ... and run through this queue after finishing all EventHandler functions ...

Or is there already something like this in CEGUI ???

C YA - []Nuker

[CrazyEddie]

Yep, you're right. It's because the disconnection is done from within the event handler (that'll teach me to look more closely at the code you posted ).

The issue has been raised before here, and a potential patch might be in the works here, though I'm not sure of the status of that effort.

So, basically, yeah, for now you'll need to implement some kind of pool to store the connections you need to erase and handle it outside of the event handlers .

CE.

[Nuker]

Ok, at least I know where the failure comes from and I can solve the problem.

Thx for your help CE and THX(!!!) for your great gui system!!!

C YA - []Nuker