How to handle check box events in alv tree.

Question

hi,
i am working in CL_GUI_COLUMN_TREE class.Also using Check box. Now i want to handle events for check box . I am new to ABAP Objects.
Pls expaline in detail or send code
thanks in advance,
senthil kumar.r

Answer 1

Hello Senthil
Have a look at the sample report
SAPCOLUMN_TREE_CONTROL_DEMO
. The crucial points are:
<b>(1) Register the required events at the control</b>
* define the events which will be passed to the backend
  " checkbox change
  event-eventid = CL_GUI_COLUMN_TREE=>EVENTID_checkbox_change.
  event-appl_event = 'X'.
  append event to events.
  CALL METHOD G_TREE->SET_REGISTERED_EVENTS
    EXPORTING
      EVENTS = EVENTS
    EXCEPTIONS
      CNTL_ERROR                = 1
      CNTL_SYSTEM_ERROR         = 2
      ILLEGAL_EVENT_COMBINATION = 3.
  IF SY-SUBRC <> 0.
    MESSAGE A000.
  ENDIF.
<b>(2) Set the event handler</b>
assign event handlers in the application class to each desired event
  SET HANDLER G_APPLICATION->HANDLE_CHECKBOX_CHANGE FOR g_tree.
<b>(3) Define and implement event handler method</b>
  METHOD  HANDLE_CHECKBOX_CHANGE.
    " this method handles the checkbox_change event of the tree
    " control instance
    " show the key of the node and the name of the item
    " of the clicked checkbox in a dynpro field
    G_EVENT = 'CHECKBOX_CHANGE'.
    G_NODE_KEY = NODE_KEY.
    G_ITEM_NAME = ITEM_NAME.
    CLEAR  G_HEADER_NAME.
  ENDMETHOD.
Regards
  Uwe