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ennowulff
Active Contributor
16,043
Sometimes the column description of an ALV grid is not sufficient and one would like to have multiple lines as column header. With this trick it is possible to realize such a behaviour.

Demonstration


This is how it looks like deomnstrated with the countries table T005T:



Solution Description


Two grids will be created: one for the header lines (column description) and one for the data. The field catalog of the data table will be copied to the header structure. All fields are set to "TEXT40" rollname to display longer column titles. Disturbing attributes like conversion exit are deleted.

The two grids are displayed in a splitter container. The upper container is set to "not resizeable" to have fixed header lines.

The data table will be adapted so that no column changes are possible. All changes like resizing and moving of columns must be done in the header grid. Unfortunately there is no event that reacts on these changes. So the changes made to the header grid can only be copied to the data grid after pressing a key.

Enhancements


This is a proof-of-concept. The data table is defined within the class. To reuse the functionality, the data table should be passed from outside. Maybe a direct inheritance of CL_GUI_ALV_GRID would also be helpful.

If a toolbar is needed, then all function codes from the header grid must be passed to the data grid without effecting the header grid.

Known issues


The horizontal scroll position cannot be copied as there is IMHO no chance to get visible columns and no function to do something like "set first visible column". Ideas appreciated...

Github


Code is also on github with lars.hvam's abapGit-tool.

Code


REPORT ztrcktrsr_multi_header_grid.


* two grids
* upper: multi rows title columns
* lower: data


PARAMETERS test.

CLASS my_grid DEFINITION INHERITING FROM cl_gui_alv_grid.
PUBLIC SECTION.
METHODS set_resize_cols_public
IMPORTING
res TYPE i.
ENDCLASS.

CLASS my_grid IMPLEMENTATION.
METHOD set_resize_cols_public.
set_resize_cols( res ).
ENDMETHOD.

ENDCLASS.

CLASS multi_title_grid DEFINITION.
PUBLIC SECTION.
METHODS constructor
IMPORTING
container TYPE REF TO cl_gui_container.
METHODS set_data.
METHODS copy.

METHODS set_title_for_column
IMPORTING
column TYPE lvc_fname
text1 TYPE string
text2 TYPE string OPTIONAL
text3 TYPE string OPTIONAL.

METHODS set_title_for_column_n
IMPORTING
column TYPE lvc_fname
idx TYPE i
text TYPE string.

DATA grid_head TYPE REF TO my_grid.
DATA grid_data TYPE REF TO my_grid.

PROTECTED SECTION.
DATA data TYPE STANDARD TABLE OF t005t.
DATA head TYPE REF TO data.

DATA splitter TYPE REF TO cl_gui_splitter_container.
DATA container_head TYPE REF TO cl_gui_container.
DATA container_data TYPE REF TO cl_gui_container.

DATA fcat_head TYPE lvc_t_fcat.
DATA fcat_data TYPE lvc_t_fcat.

METHODS convert_table_to_header.

ENDCLASS.

CLASS multi_title_grid IMPLEMENTATION.
METHOD constructor.

convert_table_to_header( ).

splitter = NEW #( parent = container rows = 2 columns = 1 ).
splitter->set_row_sash(
EXPORTING
id = 1
type = cl_gui_splitter_container=>type_sashvisible
value = cl_gui_splitter_container=>false ).

splitter->set_row_mode( mode = cl_gui_splitter_container=>mode_absolute ).

splitter->set_row_height( id = 1 height = 80 ).


container_head = splitter->get_container(
row = 1
column = 1 ).

container_data = splitter->get_container(
row = 2
column = 1 ).

grid_head = NEW #( i_parent = container_head ).

FIELD-SYMBOLS <head> TYPE ANY TABLE.

ASSIGN head->* TO <head>.

grid_head->set_table_for_first_display(
EXPORTING
i_default = space
is_layout = VALUE lvc_s_layo( no_toolbar = abap_true
no_headers = abap_false
no_hgridln = abap_true )
CHANGING
it_outtab = <head>
it_fieldcatalog = fcat_head
EXCEPTIONS
invalid_parameter_combination = 1
program_error = 2
too_many_lines = 3
OTHERS = 4 ).



grid_data = NEW #( i_parent = container_data ).
grid_data->set_table_for_first_display(
EXPORTING
i_default = space
is_layout = VALUE lvc_s_layo( no_toolbar = abap_true
no_headers = abap_true )
CHANGING
it_outtab = data
it_fieldcatalog = fcat_data
EXCEPTIONS
invalid_parameter_combination = 1
program_error = 2
too_many_lines = 3
OTHERS = 4 ).


grid_data->set_resize_cols_public( 0 ).


ENDMETHOD.

METHOD convert_table_to_header.

DATA strdef_header TYPE REF TO cl_abap_structdescr.
DATA tabdef_header TYPE REF TO cl_abap_tabledescr.

DATA components_head TYPE cl_abap_structdescr=>component_table.


CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
EXPORTING
i_buffer_active = 'X'
i_structure_name = 'T005T'
CHANGING
ct_fieldcat = fcat_data " Field Catalog with Field Descriptions
EXCEPTIONS
inconsistent_interface = 1 " Call parameter combination error
program_error = 2 " Program Errors
OTHERS = 3.
IF sy-subrc = 0.

LOOP AT fcat_data ASSIGNING FIELD-SYMBOL(<field_data>).
APPEND INITIAL LINE TO fcat_head ASSIGNING FIELD-SYMBOL(<field_head>).
<field_head> = <field_data>.
<field_head>-rollname = 'TEXT40'.
<field_head>-domname = 'TEXT40'.
<field_head>-inttype = 'C'.
<field_head>-datatype = 'CHAR'.
<field_head>-ref_field = space.
<field_head>-ref_table = space.
<field_head>-edit_mask = space.
<field_head>-convexit = space.
IF <field_head>-key = abap_true.
<field_head>-key = abap_false.
<field_head>-emphasize = 'C310'.
ELSE.
<field_head>-emphasize = 'C300'.
ENDIF.
APPEND VALUE #(
name = <field_data>-fieldname
type = CAST cl_abap_datadescr( cl_abap_elemdescr=>describe_by_name( 'TEXT40' ) )
) TO components_head.
ENDLOOP.
ENDIF.

TRY.
strdef_header = cl_abap_structdescr=>create(
p_components = components_head ).
tabdef_header = cl_abap_tabledescr=>create(
p_line_type = strdef_header
p_table_kind = cl_abap_tabledescr=>tablekind_std ).
CREATE DATA head TYPE HANDLE tabdef_header.

LOOP AT fcat_head
ASSIGNING <field_head>.
set_title_for_column(
column = <field_head>-fieldname
text1 = CONV #( <field_head>-scrtext_s )
text2 = CONV #( <field_head>-scrtext_m )
text3 = CONV #( <field_head>-reptext ) ).


ENDLOOP.

CATCH cx_sy_table_creation.
CATCH cx_sy_struct_creation.
ENDTRY.

ENDMETHOD.

METHOD set_title_for_column.

set_title_for_column_n(
column = column
idx = 1
text = text1 ).

set_title_for_column_n(
column = column
idx = 2
text = text2 ).

set_title_for_column_n(
column = column
idx = 3
text = text3 ).

ENDMETHOD.

METHOD set_title_for_column_n.

FIELD-SYMBOLS <head> TYPE STANDARD TABLE.
ASSIGN head->* TO <head>.

READ TABLE <head> INDEX idx ASSIGNING FIELD-SYMBOL(<head_line>).
IF sy-subrc > 0.
APPEND INITIAL LINE TO <head> ASSIGNING <head_line>.
ENDIF.

ASSIGN COMPONENT column OF STRUCTURE <head_line> TO FIELD-SYMBOL(<text>).
CHECK sy-subrc = 0.

<text> = text.


ENDMETHOD.

METHOD set_data.

SELECT * FROM t005t
INTO TABLE @data
WHERE spras = @sy-langu.

grid_data->refresh_table_display( ).

ENDMETHOD.

METHOD copy.

grid_head->get_frontend_fieldcatalog(
IMPORTING
et_fieldcatalog = DATA(fcat_head) ).

grid_data->get_frontend_fieldcatalog(
IMPORTING
et_fieldcatalog = DATA(fcat_data) ).

LOOP AT fcat_head INTO DATA(field_head).
fcat_data[ fieldname = field_head-fieldname ]-outputlen = field_head-outputlen.
ENDLOOP.

grid_data->set_frontend_fieldcatalog( fcat_data ).
grid_data->refresh_table_display(
i_soft_refresh = abap_true
is_stable = VALUE #(
col = abap_true
row = abap_true ) ).

"eliminate marks
grid_head->refresh_table_display(
i_soft_refresh = abap_true
is_stable = VALUE #(
col = abap_true
row = abap_true ) ).

ENDMETHOD.

ENDCLASS.



INITIALIZATION.

DATA(docker) = NEW cl_gui_docking_container( side = cl_gui_docking_container=>dock_at_bottom ratio = 90 ).
DATA(demo) = NEW multi_title_grid( container = docker ).
demo->set_data( ).


AT SELECTION-SCREEN.
demo->copy( ).

 
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