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Using object in different class

 
Jackie Davis
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Hi there, another concept Im struggling with...







I have methods defined in a Mesh class. I want to use these methods as the scrollbar is adjusted - (i.e. within the ScrollbarListener class - geo.someMethod() ) However geo is inialised in the MeshTesterGLSpace class. How can I use this object (geo) in the ScrollbarListener class?
 
Jeff Albertson
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ScrollListener, being an inner class of MeshTester, can invoke any method on its enclosing object, even private methods:

Therefore, if you can write a MeshTester method that does what you want, then you can call it from ScrollListener.
 
Jackie Davis
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Hmmm...

I see what you are saying. But I have a 'Mesh' object intialised in the MeshTesterGLSpace class called 'geo'.

I have a seperate Mesh class with methods.

I would like to use the object geo in ScrollListener (i.e geo.getVertices(); ). But because the Mesh object 'geo' has not been initalised in the MeshTester class I cannot use it here.

Hope I've explained this ok.

How do I get around it?

Thanks
 
Jeff Albertson
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You metioned that field geo has not been initialised. Why not? It's hard to send a message to an object that doesn't exist
 
Vinayak patil
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This may help:

Have a MeshTesterGLSpace instance (myMeshTesterGLSpace) in the MeshTester Class.

Call the method that initializes the geo object:
myMeshTesterGLSpace.initMesh()

Then you can use the geo object as

myMeshTesterGLSpace.geo

-Vinayak
 
Jeff Albertson
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Also, what's the relationship between MeshTester and MeshTesterGLSpace?
1. Does one have an instance of the other as a field?
2. Is one passed the other in some method?
3. Is one created locally in the method of the other?
There's many ways to get objects to send messages to each other.
 
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