Recording User Input with the Context Change Log

Before you can record user input, first activate the context change log with method ENABLE_CONTEXT_CHANGE_LOG of interface IF_WD_CONTEXT:

method WDDOINIT .
  wd_context->get_context( )->enable_context_change_log( ).
endmethod. 

For example, in the event handler you can query details of a context node of type IF_WD_CONTEXT_NODE_2D in order to get a detailed change log. The source code below displays an example of the onEnter event of a CInputFields:

method ONACTIONON_ENTER .

  data lo_element type ref to if_wd_context_element.
  data lo_node_2d type ref to if_wd_context_node_2d.
  data lt_changes type        if_wd_context_node_2d=>ty_t_change_log_2d.

lo_element = wdevent->get_context_element( `CONTEXT_ELEMENT` ).
  lo_node_2d ?= lo_element->get_node( ).
  if lo_node_2d is bound.
    lt_changes = lo_node_2d->get_context_change_log_2d( ).
  endif.
endmethod. 

Alternatively, you can use method GET_CONTEXT_CHANGE_LOG:

wd_context->get_context( )->get_context_change_log( ).

In this case, the two-dimensional key in the attribute name must be encoded to avoid inconsistencies between traditional and two-dimensional context nodes.