Achievement

By clicking down or up button, the table width could be changed dynamically - each time the button is clicked,
the width increases or shrinks at 10 px interval.

(1) Create a table view with toolbar defined:

(2) Create the attribute gt_toolbar_button in controller class:

Define the on click handling logic for button DOWN and UP:

(3) Create two event handler for DOWN and UP:

 method EH_ONDOWN.   change( iv_up = abap_false ). endmethod.  method EH_ONUP.   change( iv_up = abap_true ). endmethod.

The implementation of change method:

 method CHANGE.  CALL METHOD me->configuration_descr->get_config_data    RECEIVING       rv_result                = DATA(lv_xml)    EXCEPTIONS       config_not_found         = 1.  CHECK sy-subrc = 0.  DATA(ls_config_data) = cl_bsp_dlc_table_utility=>conf_xml_to_abap( lv_xml ).  LOOP AT ls_config_data-columndefinition ASSIGNING FIELD-SYMBOL(<column>).     <column>-width = GET_WIDTH( iv_up = iv_up iv_old_value = <column>-width ).  ENDLOOP.  DATA(lv_xml_changed) = cl_bsp_dlc_table_utility=>conf_abap_to_xml( ls_config_data ).  DATA(lr_configuration2) = CAST if_bsp_dlc_config_table_layout( me->configuration_descr ).  lr_configuration2->set_active_table_layout( iv_config_data = lv_xml_changed ). endmethod.

The implementation of get_width method:

  method GET_WIDTH.     DATA lv_new TYPE i.     DATA lv_temp TYPE string.     lv_temp = iv_old_value.     REPLACE ALL OCCURRENCES OF 'px' IN lv_temp WITH space.     CONDENSE lv_temp NO-GAPS.     lv_new = lv_temp.     IF iv_up = abap_true.       lv_new = lv_new + 10.     ELSE.       lv_new = lv_new - 10.     ENDIF.     lv_temp = lv_new.     value = lv_temp && 'px'.     CONDENSE value NO-GAPS.  endmethod.

Signature of these two methods:

 methods CHANGE    importing      !IV_UP type ABAP_BOOL .  methods GET_WIDTH    importing      !IV_OLD_VALUE type STRING      !IV_UP type ABAP_BOOL    returning      value(VALUE) type STRING .

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