Home  Sample Code ABAP OO ABAP OO Events Demo
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Written by Anon.
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Sunday, 27 May 2007 |
REPORT demo_abap_objects_events NO STANDARD PAGE HEADING.
INCLUDE <list>.
************************************************************************
* Declarations
************************************************************************
INTERFACE i_vehicle.
DATA max_speed TYPE i.
EVENTS: speed_change EXPORTING value(new_speed) TYPE i.
METHODS: drive,
stop.
ENDINTERFACE.
*-----------------------------------------------------------------------
CLASS c_ship DEFINITION.
PUBLIC SECTION.
METHODS constructor.
INTERFACES i_vehicle.
PRIVATE SECTION.
ALIASES max FOR i_vehicle~max_speed.
DATA ship_speed TYPE i.
ENDCLASS.
*-----------------------------------------------------------------------
CLASS c_truck DEFINITION.
PUBLIC SECTION.
METHODS constructor.
INTERFACES i_vehicle.
PRIVATE SECTION.
ALIASES max FOR i_vehicle~max_speed.
DATA truck_speed TYPE i.
ENDCLASS.
*-----------------------------------------------------------------------
CLASS status DEFINITION.
PUBLIC SECTION.
CLASS-EVENTS button_clicked EXPORTING value(fcode) TYPE sy-ucomm.
CLASS-METHODS: class_constructor,
user_action.
ENDCLASS.
*-----------------------------------------------------------------------
CLASS c_list DEFINITION.
PUBLIC SECTION.
METHODS: fcode_handler FOR EVENT button_clicked OF status
IMPORTING fcode,
list_change FOR EVENT speed_change OF i_vehicle
IMPORTING new_speed,
list_output.
PRIVATE SECTION.
DATA: id TYPE i,
ref_ship TYPE REF TO c_ship,
ref_truck TYPE REF TO c_truck,
BEGIN OF line,
id TYPE i,
flag(1) TYPE c,
iref TYPE REF TO i_vehicle,
speed TYPE i,
END OF line,
list LIKE SORTED TABLE OF line WITH UNIQUE KEY id.
ENDCLASS.
************************************************************************
* Implementations
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CLASS c_ship IMPLEMENTATION.
METHOD constructor.
max = 30.
ENDMETHOD.
METHOD i_vehicle~drive.
CHECK ship_speed < max.
ship_speed = ship_speed + 10.
RAISE EVENT i_vehicle~speed_change
EXPORTING new_speed = ship_speed.
ENDMETHOD.
METHOD i_vehicle~stop.
CHECK ship_speed > 0.
ship_speed = 0.
RAISE EVENT i_vehicle~speed_change
EXPORTING new_speed = ship_speed.
ENDMETHOD.
ENDCLASS.
*-----------------------------------------------------------------------
CLASS c_truck IMPLEMENTATION.
METHOD constructor.
max = 150.
ENDMETHOD.
METHOD i_vehicle~drive.
CHECK truck_speed < max.
truck_speed = truck_speed + 50.
RAISE EVENT i_vehicle~speed_change
EXPORTING new_speed = truck_speed.
ENDMETHOD.
METHOD i_vehicle~stop.
CHECK truck_speed > 0.
truck_speed = 0.
RAISE EVENT i_vehicle~speed_change
EXPORTING new_speed = truck_speed.
ENDMETHOD.
ENDCLASS.
*-----------------------------------------------------------------------
CLASS status IMPLEMENTATION.
METHOD class_constructor.
SET PF-STATUS 'VEHICLE'.
WRITE 'Click a button!'.
ENDMETHOD.
METHOD user_action.
RAISE EVENT button_clicked EXPORTING fcode = sy-ucomm.
ENDMETHOD.
ENDCLASS.
*-----------------------------------------------------------------------
CLASS c_list IMPLEMENTATION.
METHOD fcode_handler.
CLEAR line.
CASE fcode.
WHEN 'CREA_SHIP'.
id = id + 1.
CREATE OBJECT ref_ship.
line-id = id.
line-flag = 'C'.
line-iref = ref_ship.
APPEND line TO list.
WHEN 'CREA_TRUCK'.
id = id + 1.
CREATE OBJECT ref_truck.
line-id = id.
line-flag = 'T'.
line-iref = ref_truck.
APPEND line TO list.
WHEN 'DRIVE'.
CHECK sy-lilli > 0.
READ TABLE list INDEX sy-lilli INTO line.
CALL METHOD line-iref->drive.
WHEN 'STOP'.
LOOP AT list INTO line.
CALL METHOD line-iref->stop.
ENDLOOP.
WHEN 'CANCEL'.
LEAVE PROGRAM.
ENDCASE.
CALL METHOD list_output.
ENDMETHOD.
METHOD list_change.
line-speed = new_speed.
MODIFY TABLE list FROM line.
ENDMETHOD.
METHOD list_output.
sy-lsind = 0.
SET TITLEBAR 'TIT'.
LOOP AT list INTO line.
IF line-flag = 'C'.
WRITE / icon_ws_ship AS ICON.
ELSEIF line-flag = 'T'.
WRITE / icon_ws_truck AS ICON .
ENDIF.
WRITE: 'Speed = ', line-speed.
ENDLOOP.
ENDMETHOD.
ENDCLASS.
************************************************************************
* Global data of program
************************************************************************
DATA list TYPE REF TO c_list.
************************************************************************
* Program events
************************************************************************
START-OF-SELECTION.
CREATE OBJECT list.
SET HANDLER: list->fcode_handler,
list->list_change FOR ALL INSTANCES.
*-----------------------------------------------------------------------
AT USER-COMMAND.
CALL METHOD status=>user_action.
************************************************************************
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