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For those new to this tutorial, the preceding four parts were:

Part 4 of “Event-Driven” Tutorial on the WD-ABAP Component WDR_TEST_UI_ELEMENTS.

“Procedural” Recap of What’s Been Learned So Far in “Experiential” (“Event-Driven”) Tutorial on WD-ABAP component WDR_TEST_UI_ELEMENTS

The class infrastructure of WDR_UI_TEST_ELEMENTS is exquisite for lazy cloning and change-ups.

Experiential vs Procedural Tutorials: “Breaking” WDR_TEST_UI_ELEMENTS to Learn From It.

At the end of the last of these, we were able to get the root node of a tree to display in the right-hand side

tree-view

when a link is selected from the “

Logical Database

” tray in the left-hand side

tray-view

. We now want to make the right-hand tree-view display not only the root-node, but also the complete hiearchical tree structure of the Logical Database that has been selected. For example, if the user selects the “

Vendor Database

” link from the “

Logical Database

” tray, we want the hierarchical tree structure of the LDB “

KDF

” to display just as it does when one displays the internal structure of “

KDF”

using the standard transaction SE36.

To accomplish this goal, we will create two new methods in the clone cclass

ZCL_WDR_ALL_IN_ONE_UIELEM

,

create_lgcldb_tree

and

create_lgcldb_nodes

, and place a

CASE

statement into the

create

method of this class so that it invokes

create_lgcldb_tree

instead of

create_aggregations

when a link in the Logical Database Tray is selected. Although it turns out that we only have to steal less than 100 lines of code from

create_aggregations

and

create_aggregatee

to “code up” our two new methods, there is some prior housekeeping that has to be done in order to ensure that these two new methods have the metadata they need from the SAP-delivered table

ldbn

. All of this housekeeping is included in the steps outlined below.

Step 1.

What

: Make the Title of the right-hand side tree view read

“Navigation Guide to Selected Object”

rather than

“Hierarchy of Aggregations”

Why

: To get a more meaningul and less mysterious title (remember – we will eventually

not

want our clone component to display the UI Element libraries displayed by the origiginal component

WDR_TEST_UI_ELEMENTS

, but

only

our three new libraries (

Logical Databases

,

Programming Trees

, and

Report Sets

).

How

: In the

Layout

panel for the

Main

view of

ZWDR_TEST_UI_ELEMENTS

, click

VIEWELEMENT

and then

HIERARCHY

. Then in the “properties” panel that displays for

HIERARCHY

, change the title. Save and activate.

Step 2.

What

: Get the “

Logical Database

” tray in the left-hand-side tray view to display expanded (instead of the “

Standard

” tray) when the

Main

view first opens, and also pre-select “

Vendor Database

” so that this logical database will display in the right-hand side tree-view when the

Main

view first opens.

Why

: Easier to run the debugger, i.e. we’ll reach the break-points we want the first time around, not the second.

How

:

Step 2a

: In

ClassBuilder (SE24)

, bring up the clone component

ZCL_WDR_ALL_IN_ONE_UTIL

, then select the

Methods

tab, and then select the

init_view2

method.  In this method,  find the code that reads:

********************************************************

  •       create a new tray

        concatenate current_library ‘_LIB’ into tray_id.

        if current_library = ‘STANDARD’.

          is_expanded = abap_true.

        else.

          is_expanded = abap_false.

        endif.

*******************************************************

and change the literal

‘STANDARD’

to the literal

‘LGCLDBS’

.

Step 2b

: In the same method,  find the code at the bottom that reads:

************************************************************

  • set the default ui element and library

  m_cur_library       = ‘STANDARD’.

  m_cur_ui_element    = ‘BUTTON’.

***********************************************************

Replace

‘STANDARD’

with

‘LGCLDBS’

and

‘BUTTON’

with

‘KDF’

. Save and activate.

Step 3.

What

: Prepare the Logical Database metadata that the clone component will need to display the internal hierarchical tree structure of any logical database.

Why

: We could just use the SAP-delivered table

ldbn

for this purpose, but this table doesn’t have a column indicating whether a given

ldbnode

has any children, i.e whether it is a

maximal

(leaf) node or not. If we create such a column in a clone of

ldbn

, it will be easier to steal what we need from the SAP-delivered methods

create_aggregations

and

create_aggregatee

of

CL_WDR_ALL_IN_ONE_UIELEM

for the two new methods

create_lgcldb_tree

and

create_lgcldb_nodes

of the clone class

ZCL_WDR_TEST_ALL_IN_ONE_UIELEM

How

:

Step 3a

: Using

Dictionary Maintenance (SE11)

, create TWO copies of

ldbn

named

zldbnw

and

zldbn

.

Step 3b

: Add an index to the work table

zldbnw

consisting of the two columns

ldbname

and

parentnode

.

Step 3c

: Add a

char1

column to the table

zldbn

called

ismax

.

Step 3d

: Run the following program, which backloads the SAP-delivered table

ldbn

to a local PC *.csv file.  ( Those folks who have a “playground” XI instance of SAP will find that  they’ll often have to do this kind of backload because their “playground” instance won’t necessarily have the metadata they need.)

&—-


REPORT  Z_GET_LDBN.

TYPES:

  t_ldbn_out_line(100)      TYPE c,

  t_ldbn_out                TYPE

                            TABLE OF t_ldbn_out_line

                            INITIAL SIZE 0.

DATA:

  i_ldbn_out                TYPE t_ldbn_out,

  wa_ldbn_out               TYPE t_ldbn_out_line,

  wa_ldbn                   TYPE ldbn,

  i_ldbn                    TYPE STANDARD TABLE OF ldbn,

  v_lfile1(30)              TYPE c,

  v_fn_out                  TYPE string,

  v_currnumb(4)             TYPE c,

  v_inclnumb(4)             TYPE c,

  v_work_len22(22)          TYPE c,

  v_work_len4(4)            TYPE c.

v_lfile1 = ‘C:ldbn.csv’.

v_fn_out = v_lfile1.

SELECT * FROM ldbn INTO wa_ldbn.

  v_work_len22 = wa_ldbn-currnumb.

  WRITE v_work_len22 to v_work_len4 RIGHT-JUSTIFIED.

  SHIFT v_work_len4 LEFT DELETING LEADING SPACE.

  v_currnumb = v_work_len4.

  v_work_len22 = wa_ldbn-inclnumb.

  WRITE v_work_len22 to v_work_len4 RIGHT-JUSTIFIED.

  SHIFT v_work_len4 LEFT DELETING LEADING SPACE.

  v_inclnumb = v_work_len4.

  CONCATENATE wa_ldbn-ldbname

              wa_ldbn-ldbnode

              wa_ldbn-parentnode

              v_currnumb

              wa_ldbn-structure

              wa_ldbn-type

              wa_ldbn-typepool

              v_inclnumb

        INTO  wa_ldbn_out

    SEPARATED

           BY ‘,’.

  APPEND wa_ldbn_out TO i_ldbn_out.

ENDSELECT.

  CALL FUNCTION ‘GUI_DOWNLOAD’

       EXPORTING

            filename                = v_fn_out

            filetype                = ‘ASC’

       TABLES

            data_tab                = i_ldbn_out

       EXCEPTIONS

            file_write_error        = 1

            no_batch                = 2

            gui_refuse_filetransfer = 3

            invalid_type            = 4

            no_authority            = 5

            unknown_error           = 6

            header_not_allowed      = 7

            separator_not_allowed   = 8

            filesize_not_allowed    = 9

            header_too_long         = 10

            dp_error_create         = 11

            dp_error_send           = 12

            dp_error_write          = 13

            unknown_dp_error        = 14

            access_denied           = 15

            dp_out_of_memory        = 16

            disk_full               = 17

            dp_timeout              = 18

            file_not_found          = 19

            dataprovider_exception  = 20

            control_flush_error     = 21

            OTHERS                  = 22.

&—-


Step 3e

: Run the following program, which loads the worktable

zldbnw

with its index on

ldbname/parentnode

, and then uses this worktable to load the final metadata table

zldbn

with its

ismax

column. 

&—-


REPORT  Z_FILL_ZLDBN.

*

TYPES:

  t_row_data(100)                 TYPE c,

  t_data                         TYPE

                                 TABLE OF t_row_data

                                 INITIAL SIZE 0.

DATA:

  i_data                         TYPE t_data,

  wa_data                        TYPE t_row_data,

  v_path                         LIKE rlgrap-filename,

  wa_zldbnw                      TYPE zldbnw,

  wa_zldbn                       TYPE zldbn,

  i_zldbnw                       TYPE STANDARD TABLE of zldbnw,

  i_zldbn                        TYPE STANDARD TABLE of zldbn,

  splitsep(1)                    VALUE ‘,’,

  v_level(2)                     TYPE n,

  v_cntr                         TYPE i,

  v_root(24)                     TYPE c,

  v_cnc(4)                       TYPE c,

  v_inc(4)                       TYPE c,

  v_cnt                          TYPE i.

DELETE FROM zldbn WHERE ldbname <> ”.

COMMIT WORK.

DELETE FROM zldbnw WHERE ldbname <> ”.

COMMIT WORK.

v_path = ‘C:ldbn.csv’.

CALL  FUNCTION ‘UPLOAD’

  EXPORTING

    filename = v_path

  TABLES

    data_tab = i_data

  EXCEPTIONS

    conversion_error        = 1

    invalid_table_width     = 2

    invalid_type            = 3

    no_batch                = 4

    unknown_error           = 5

    gui_refuse_filetransfer = 6

    OTHERS                  = 7.

LOOP AT i_data INTO wa_data.

  SPLIT wa_data

     AT splitsep

   INTO wa_zldbnw-ldbname

        wa_zldbnw-ldbnode

        wa_zldbnw-parentnode

        v_cnc

        wa_zldbnw-structure

        wa_zldbnw-type

        wa_zldbnw-typepool

        v_inc.

  wa_zldbnw-currnumb = v_cnc.

  wa_zldbnw-inclnumb = v_inc.

  INSERT INTO zldbnw VALUES wa_zldbnw.

ENDLOOP.

COMMIT WORK.

SELECT * FROM zldbnw INTO TABLE i_zldbnw.

LOOP AT i_zldbnw INTO wa_zldbnw.

  MOVE-CORRESPONDING wa_zldbnw TO wa_zldbn.

  SELECT

   COUNT( * )

    FROM zldbnw

    INTO v_cnt

   WHERE ldbname    = wa_zldbnw-ldbname

     AND parentnode = wa_zldbnw-ldbnode.

  IF v_cnt = 0.

    wa_zldbn-ismax = ‘Y’.

  ELSE.

    wa_zldbn-ismax = ‘N’.

  ENDIF.

  INSERT INTO zldbn VALUES wa_zldbn.

ENDLOOP.

COMMIT WORK.

&—-


Step 4.

What

: Declare the

types

and

data

we will need to process the new metadata from

zldbn

.

Why

: We will have to work with rows from

zldbn

in the two new methods

create_lgcldb_tree

and

create_lgcldb_nodes

of the clone class

ZCL_WDR_ALL_IN_ONE_UIELEM

How

: In

ClassBuilder (SE24)

, bring up the clone component

ZCL_WDR_ALL_IN_ONE_UIELEM

, then select

Implementation

, and then

Public

.  In the code that appears, add the following type declaration and class-data declaration (the two items in boldface):

&—-


class ZCL_WDR_ALL_IN_ONE_UIELEM definition

  public

  final

  create public .

public components of class ZCL_WDR_ALL_IN_ONE_UIELEM

do not include other source files here!!!

public section.

types:
tt_zldbn type standard table of zldbn.


types:
tt_ui_elem_def_srt type sorted table of zwdy_ui_elem_def with unique key library_name definition_name .
types:
tt_ui_prop_def_srt type sorted table of wdy_ui_prop_def with unique key library_name definition_name property_name .
types:
tt_ui_aggr_def_srt type sorted table of wdy_ui_aggr_def with unique key library_name definition_name aggregation_name .
types:
tt_ui_event_def_srt type sorted table of wdy_ui_event_def with unique key library_name definition_name event_name .
types:
tt_ui_evpar_def_srt type sorted table of wdy_ui_evpar_def with unique key library_name definition_name event_name parameter_name .

class-data MT_ZLDBN type TT_ZLDBN read-only .

  class-data MT_UI_AGGR_DEF type TT_UI_AGGR_DEF_SRT read-only .

. . .

&—-


Step 5.

What

: Make the metadata in

zldbn

available to the clone component

ZWDR_TEST_UI_ELEMENTS

, or more properly, to its supporting class

ZCL_WDR_ALL_IN_ONE_UIELEM

.

Why

: This metadata is, in effect, what will be displayed in the right-hand-side tree-view of

ZWDR_TEST_UI_ELEMENTS

when a link is selected from the

Logical Database

tray in the left-hand-side tray-view.

How

:

Step 5a

: In

ClassBuilder (SE24)

, bring up the clone component

ZCL_WDR_ALL_IN_ONE_UIELEM

, then select the

Methods

tab, and then select the

init_meta_data

method.  In this method,  find the code that reads:

***************************************************

  • get all libraries

  select * from zwdy_ui_library into table mt_ui_library

        order by primary key.

  • get all view elements – below we will build the final list

  select * from zwdy_ui_elem_def into table mt_ui_elem_def_all.

**************************************

and add this select statement to these two:

****************************************

* get LDB data from zldbn
select * from zldbn into table mt_zldbn.


*****************************************

Save and activate.

Step 5b

: Now bring up the method

create

,  and find the code that reads:

****************************************

  • create the different areas

  create_settings( ).

  create_events( ).

  create_aggregations( ).

****************************************

Change this code to read:

****************************************

  • create the different areas

  create_settings( ).

  create_events( ).

       like line of mt_zldbn.                                  ” Part 5  20060908

                                  • ” Part 5  20060908 (declarations from create_aggregatee. except what’s been declared above)

data:

    initial_path                 type string,

    lr_hier_tree_context_node    type ref to if_wd_context_node,

    lr_hier_tree_context_element type ref to if_wd_context_element,

    lr_save_tree_context_element type ref to if_wd_context_element,        ” Part 5  20060908

    icon                         type string.

                                  • *****************

  • to let root node of tree be expanded by code below

   m_hier_tree_context_element->set_attribute( name = ‘EXPANDED’     value = abap_true ).

   m_hier_tree_context_element->set_attribute( name = ‘HAS_CHILDREN’ value = abap_true ).

  loop at mt_zldbn assigning .

**************************************************

  • this is from original create_aggregations

    concatenate m_prefix mc_aggr_explaination_id bind_element( new_item = lr_context_element set_initial_elements = abap_false ).

**************************************************

**************************************************

  • this is from original create_aggregatee

    lr_hier_tree_context_node = m_hier_tree_context_element->get_child_node( ‘UI_ELEMENT_HIER_REC’ ).

    lr_hier_tree_context_element = lr_hier_tree_context_node->create_element( ).

    lr_hier_tree_context_node->bind_element( new_item = lr_hier_tree_context_element set_initial_elements = abap_false ).

set_attribute( name = ‘ICON’         value = icon ).

*************************************************

**************************************************

  • this is from original create_aggregations

  • set the lead selection of the aggregation node to the currently aggregated view element

    index = sy-tabix.

    lr_aggregation_node->set_lead_selection_index( index ).

**************************************************

  • the remaining 6 lines are “new”

    lr_hier_tree_context_element->get_attribute( EXPORTING name = ‘HAS_CHILDREN’ IMPORTING value = v_hasch ).

    IF v_hasch = abap_true.

      lr_save_tree_context_element = m_hier_tree_context_element.

      m_hier_tree_context_element = lr_hier_tree_context_element.

      create_lgcldb_nodes( ).

      m_hier_tree_context_element =  lr_save_tree_context_element.

    ENDIF.

  endloop.

       like line of mt_zldbn.                                  ” Part 5 20060908

                                  • ” Part 5 20060908 (declarations from create_aggregatee. except what’s been declared above)

data:

    initial_path                 type string,

    lr_hier_tree_context_node    type ref to if_wd_context_node,

    lr_hier_tree_context_element type ref to if_wd_context_element,

    lr_save_tree_context_element type ref to if_wd_context_element,        ” Part 5 2 20060908

    icon                         type string.

  m_hier_tree_context_element->get_attribute( EXPORTING name = ‘TEXT’ IMPORTING value = v_ldbnode ).

  loop at mt_zldbn assigning .

**************************************************

  • this is from original create_aggregations

    concatenate m_prefix mc_aggr_explaination_id bind_element( new_item = lr_context_element set_initial_elements = abap_false ).

**************************************************

**************************************************

  • this is from original create_aggregatee

    lr_hier_tree_context_node = m_hier_tree_context_element->get_child_node( ‘UI_ELEMENT_HIER_REC’ ).

    lr_hier_tree_context_element = lr_hier_tree_context_node->create_element( ).

    lr_hier_tree_context_node->bind_element( new_item = lr_hier_tree_context_element set_initial_elements = abap_false ).

    IF set_attribute( name = ‘ICON’         value = icon ).

*************************************************

**************************************************

  • this is from original create_aggregations

  • set the lead selection of the aggregation node to the currently aggregated view element

    index = sy-tabix.

    lr_aggregation_node->set_lead_selection_index( index ).

**************************************************

    lr_hier_tree_context_element->get_attribute( EXPORTING name = ‘HAS_CHILDREN’ IMPORTING value = v_hasch ).

    IF v_hasch = abap_true.

      lr_save_tree_context_element = m_hier_tree_context_element.

      m_hier_tree_context_element = lr_hier_tree_context_element.

      create_lgcldb_nodes( ).

      m_hier_tree_context_element =  lr_save_tree_context_element.

    ENDIF.

  endloop.

endmethod.

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