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   Copyright: (c) 2011-2018 by Total Control Software
   License:   wxWindows License

.. include:: headings.inc

.. currentmodule:: wx.lib.delayedresult

.. highlight:: python



.. _wx.lib.delayedresult.PreProcessChain:

==========================================================================================================================================
|phoenix_title|  **wx.lib.delayedresult.PreProcessChain**
==========================================================================================================================================

Represent a 'delayed result pre-processing chain', a kind of Handler.
Useful when lower-level objects need to apply a sequence of transformations
to the delayed result before handing it over to a final handler.
This allows the starter of the worker function to not know
anything about the lower-level objects.



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|class_hierarchy| Class Hierarchy
=================================

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   Inheritance diagram for class <strong>PreProcessChain</strong>:
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|method_summary| Methods Summary
================================

================================================================================ ================================================================================
:meth:`~wx.lib.delayedresult.PreProcessChain.__init__`                           Wrap `handler(result, *args, **kwargs)` so that the result
:meth:`~wx.lib.delayedresult.PreProcessChain.addSub`                             Add a sub-callable, ie a `callable(result, *args, **kwargs)`
:meth:`~wx.lib.delayedresult.PreProcessChain.clone`                              Clone the chain. Shallow only. Useful when several threads
:meth:`~wx.lib.delayedresult.PreProcessChain.cloneAddSub`                        Convenience method that first clones self, then calls addSub()
:meth:`~wx.lib.delayedresult.PreProcessChain.count`                              How many pre-processors in the chain
================================================================================ ================================================================================


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|api| Class API
===============


.. class:: PreProcessChain

   Represent a 'delayed result pre-processing chain', a kind of Handler.
   Useful when lower-level objects need to apply a sequence of transformations
   to the delayed result before handing it over to a final handler.
   This allows the starter of the worker function to not know
   anything about the lower-level objects.

   .. method:: __init__(self, handler, \*args, \*\*kwargs)

      Wrap `handler(result, *args, **kwargs)` so that the result
      it receives has been transformed by us. 


   .. method:: addSub(self, callable, \*args, \*\*kwargs)

      Add a sub-callable, ie a `callable(result, *args, **kwargs)`
      that returns a transformed result to the previously added
      sub-callable (or the handler given at construction, if this is
      the first call to addSub). 


   .. method:: clone(self)

      Clone the chain. Shallow only. Useful when several threads
      must be started but have different sub-callables. 


   .. method:: cloneAddSub(self, callable, \*args, \*\*kwargs)

      Convenience method that first clones self, then calls addSub()
      on that clone with given arguments. 


   .. method:: count(self)

      How many pre-processors in the chain


