#include <presageCallback.h>

Inheritance diagram for PresageCallback:

Collaboration diagram for PresageCallback:

Public Member Functions
virtual	~PresageCallback ()

virtual std::string	get_past_stream () const =0

virtual std::string	get_future_stream () const =0

Protected Member Functions
	PresageCallback ()

Detailed Description

Abstract callback object used to retrieve context from user application.

A concrete callback implementation must implement the getPastStream() and getFutureStream() method which are responsible for retrieving the context from the user text buffer.

Using a callback object decouples the user application from the chosen text buffer (which could be a simple string, a graphical text widget, a file stream, etc.) and frees the caller from having to explicitly notify of any updates to the context. Presage will invoke on the callback whenever access to contextual data is required.

getPastStream() must return a string containing the text preceding the current insertion point.

getFutureStream() must return a string containing the text following the current insertion point.

Definition at line 66 of file presageCallback.h.