SWIG lua

["Leigh McRae" <leigh.mcrae@...>]

Hi,

 

  I was wondering if anyone with some SWIG-lua experience could answer a couple of questions. First it's pretty cool to see an office version of SWIG-lua around!  My problem is with trying to identify class instances within lua.  In the following example, I am using lua to handle callbacks for a GUI (note this is a contrived example): 

 

bt = Button()

bt:setHandler( 'BasicButton' )

bt.textures = { normal = CreateTexture( 'normal.tga' ), down = CreateTexture( 'down.tga' ) }

 

BasicButton = {}

function BasicButton:onMouseDown( button, x, y )

    if button == Mouse_Left then

        self:setState( Button_Down )

        self:setTexture( self.textures.down )

    end

end

 

function BasicButton:onMouseUp( button, x, y )

    if button == Mouse_Left then

        self:setState( Button_Up )

        self:setTexture( self.textures.up )

    end

end

 

  I think there are several problems here.  First I believe that bt isn't a table, it's userdata.  How can I attach attributes to it?  I was thinking that I could use the bt as a key to a table of attributes as mentioned in the Lua book but I don't think it will work for callbacks.  The C callback would push the SWIG pointer onto the stack but wouldn't it be a new userdata and hence a different key? 

  The other problem would be that the callbacks would push a Widget for 'self' and not a Button.  So I think the metatable won't have the button entries for its member functions.  Is there a way to cast?

 

Leigh