Contents

The blog will explain how to use the MVC design pattern with full screen controls.
The used implementation of the MVC design pattern is explained in this blog.
In the example we will use a full screen ALV control that is generated by my ALV OM wrapper class.

Because I didn't yet explain the part how to use the model, in this example the model is integrated in the controller. I understand that the separation of the business logic is the most important thing, but I just wanted to give an example how you can deal with full screen controls.

The example code

When you execute the code you will see a full screen ALV with some data of table SFLIGHT. When you double click on a row, that row is appended to the ALV.

Code to call the full screen control

zcl_screen_manager=>call_screen( EXPORTING iv_program = sy-repid iv_screen = '1' iv_controller = 'LCL_SCR_CNTRL_1' ).

Code of the local screen controller

CLASS lcl_scr_cntrl_1 DEFINITION INHERITING FROM zcl_screen_cntrl. PUBLIC SECTION. METHODS call_screen REDEFINITION. METHODS set_data REDEFINITION. METHODS set_display REDEFINITION. METHODS handle_action REDEFINITION. PRIVATE SECTION. DATA go_alv TYPE REF TO lcl_alv_om. DATA gt_sflight TYPE TABLE OF sflight. ENDCLASS. CLASS lcl_scr_cntrl_1 IMPLEMENTATION. METHOD call_screen. set_screen( ). ENDMETHOD. METHOD set_data. "Get data from model, in this example there is no model SELECT * FROM sflight INTO TABLE gt_sflight WHERE carrid = 'AA'. ENDMETHOD. METHOD set_display. "Set screen CREATE OBJECT go_alv EXPORTING iv_double_click = abap_true. go_alv->gv_screen = gv_screen. go_alv->set_data( CHANGING ct_data = gt_sflight ). go_alv->display( ). ENDMETHOD. METHOD handle_action. CASE gv_action. WHEN 'ALV_DOUBLE_CLICK'. "Do something with the model FIELD-SYMBOLS <ls_sflight> TYPE sflight. ASSIGN go_alv->gs_row_data->* TO <ls_sflight>. IF <ls_sflight> IS ASSIGNED. APPEND <ls_sflight> TO gt_sflight. go_alv->display( ). ENDIF. WHEN OTHERS. "When you don't want to refresh the screen gv_refresh = abap_false. ENDCASE. ENDMETHOD. ENDCLASS.

Code of the ALV OM wrapper class

CLASS lcl_alv_om DEFINITION INHERITING FROM zcl_alv_om. PUBLIC SECTION. DATA gv_screen TYPE sydynnr. DATA gs_row_data TYPE REF TO data. PROTECTED SECTION. METHODS on_double_click REDEFINITION. ENDCLASS. CLASS lcl_alv_om IMPLEMENTATION. METHOD on_double_click. GET REFERENCE OF is_row_data INTO gs_row_data. zcl_screen_manager=>handle_action( EXPORTING iv_program = sy-repid iv_screen = gv_screen iv_action = 'ALV_DOUBLE_CLICK' ). ENDMETHOD. ENDCLASS.