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?