WDABAP: note of change of Lead Selection overall component

Question

Hi,
I would like to build a similiar wd-application like wd-component 'wdt_master_detail'. There you will see a table with fly-data and below some details of the actual selected row of the table (by lead selection).
The difference is that I want to seperate the data retrieval in a model-component(z_model) and for the table / details two seperate wd-components(z_table / z_detail) which mapps the fly-data. The wd-application instantiate a wd-component (z_container) which includes in its view z_table and z_detail.
When the lead selection changes(by selecting a new row in the table of z_table) the details of z_detail should change to the details of the element with the lead selection. But this does not work! By node->get_lead_selection_index in z_detail I get only the inital lead-selection. node->get_lead_selection_index in z_table provides the right index.
I tried also following: z_table calls z_model->set_lead_selection and this method set the lead selection of the original node new. But this does not help.
Has someone an idee what I have to do that the component z_detail receive the information? Has the z_model to raise an event with the information of the new index? I hope not.
Thanks a lot!
Regards,
Marcel
added 1:
I have an assumption why it does not work:
Maybe z_table and z_detail instantiates two separate z_model.
So a solution would be that z_container instantiates z_model and provide this instance to z_table and z_detail but I have absolutly no idee whether and how this could be working... Please kindly help.
added 2:
I thinking further a little bit loud...
I have the idea that z_container mapps the context from z_model and set this these to input-node.
z_table and z_detail mapps from z_container. ok, if I would like to create many application then I have to create related components(z_comp_appl_xx) and these components includes z_container. This would be maybe the solution if there is a instance problem(see added1) but I have tested and the details screen gets NOT the lead selection
Message was edited by: Marcel Schreier

Answer 1

Hi Marcel,
to extend Thomas comments, here are some suggestions to turn it into code. Hope it helps.
option A)
assuming you name the usages in z_container "usage_z_model", "usage_Z_table", "usage_Z_detail":
in componentcontroller of z_container methode wddoinit() do the following:
DATA lr_model_usage    TYPE REF TO    if_wd_component_usage.
lr_model_usage =   wd_this->wd_cpuse_usage_z_model( ).
IF lr_model_usage->has_active_component( ) IS INITIAL.
  lr_model_usage->create_component( ).
ENDIF.
DATA lr_usage    TYPE REF TO    if_wd_component_usage.
lr_usage =   wd_this->wd_cpuse_usage_z_table( ).
IF lr_usage->has_active_component( ) IS INITIAL.
  lr_usage->create_component( model_usage = lr_model_usage ).
ENDIF.
lr_usage =   wd_this->wd_cpuse_usage_z_detail( ).
IF lr_usage->has_active_component( ) IS INITIAL.
  lr_usage->create_component( model_usage = lr_model_usage ).
ENDIF.
Following this way, it is required to name the usages of z_model in component z_table and z_detail "MODEL_USAGE".
option B)
in componentcontroller of z_table and z_detail create an interface-methode set_usage() with one parameter ir_usage type if_wd_component_usage
  DATA lr_usage  TYPE REF TO  if_wd_component_usage.
  lr_usage = wd_this->wd_cpuse_usage_z_model( ).
  lr_usage->enter_referencing_mode( ir_usage ).
in component z_container method wddoinit() do the following:
DATA lr_usage    TYPE REF TO    if_wd_component_usage.
DATA lr_if_ctr_z_table TYPE REF TO iwci_z_table.
DATA lr_if_ctr_z_detail TYPE REF TO iwci_z_detail.
DATA lr_model_usage    TYPE REF TO    if_wd_component_usage.
*-- create instance of z_model
lr_model_usage =   wd_this->wd_cpuse_usage_z_model( ).
IF lr_model_usage->has_active_component( ) IS INITIAL.
  lr_model_usage->create_component( ).
ENDIF.
*-- create instance of z_table
lr_usage =   wd_this->wd_cpuse_usage_z_table( ).
IF lr_usage->has_active_component( ) IS INITIAL.
  lr_usage->create_component( ).
ENDIF.
*-- set usage
lr_if_ctr_z_table =   wd_this->wd_cpifc_usgae_z_table( ).
lr_if_ctr_z_table->set_usage( model_usage = lr_usage).
*-- create instance of z_deatil
lr_usage =   wd_this->wd_cpuse_usage_z_detail( ).
IF lr_usage->has_active_component( ) IS INITIAL.
  lr_usage->create_component( model_usage = lr_model_usage ).
ENDIF.
*-- set usage
lr_if_ctr_z_detail =   wd_this->wd_cpifc_usage_z_detail( ).
lr_if_ctr_z_detail->set_usage( model_usage = lr_usage).
regards, Ulli