topic Re: Simple tree view control in Application Development and Automation Discussions

Simple tree view control

Former Member — Fri, 23 Sep 2005 07:16:32 GMT

Hi,

i am going through the example SAPSIMPLE_TREE_MODEL_DEMO

could some one give me a insight look at this areas

1.In export parameter we used 'node_selection_mode = cl_simple_tree_model=>node_sel_mode_single' creating an instance of gtree ?

*create a simple tree model instance

CREATE OBJECT g_tree

EXPORTING

node_selection_mode = cl_simple_tree_model=>node_sel_mode_single

2.wat does this mean

create the view (control) of the tree model

CALL METHOD g_tree->create_tree_control

EXPORTING

parent = g_custom_container

EXCEPTIONS

lifetime_error = 1

cntl_system_error = 2

create_error = 3

failed = 4

tree_control_already_created = 5.

IF sy-subrc <> 0.

MESSAGE a001(s).

ENDIF.

3.how are events handeled .

define the events which will be passed to the backend

" node double click

event-eventid = cl_simple_tree_model=>eventid_node_double_click.

event-appl_event = 'X'. " process PAI if event occurs

APPEND event TO events.

CALL METHOD g_tree->set_registered_events

EXPORTING

events = events

EXCEPTIONS

illegal_event_combination = 1

unknown_event = 2.

IF sy-subrc <> 0.

MESSAGE a001(s).

ENDIF.

4.for event DOUBLE_CLICK this it uses an attribute which is unique eventid , how can i find eventids for other events

Thanks.

azee.

Re: Simple tree view control

Former Member — Fri, 23 Sep 2005 07:35:55 GMT

1- You should define a your local class for the events and in your top define a variable like that class:

CLASS LCL_MY_EVENT DEFINITION DEFERRED.

DATA: G_APPLICATION TYPE REF TO LCL_MY_EVENT.

CLASS DEFINTION/IMPLEMENTATION

CLASS LCL_MY_EVENT DEFINITION.

PUBLIC SECTION.

METHODS:

HANDLE_NODE_DOUBLE_CLICK

FOR EVENT NODE_DOUBLE_CLICK

OF CL_GUI_SIMPLE_TREE

IMPORTING NODE_KEY,

...........

ENDCLASS.

CLASS LCL_MY_CLASS IMPLEMENTATION.

METHOD HANDLE_NODE_DOUBLE_CLICK.

............

ENDMETHOD.

ENDCLASS.

2- you should add the piece code to active the event:

CALL METHOD g_tree->set_registered_events

EXPORTING

events = events

EXCEPTIONS

illegal_event_combination = 1

unknown_event = 2.

IF sy-subrc <> 0.

MESSAGE a001(s).

ENDIF.

SET HANDLER G_APPLICATION->HANDLE_NODE_DOUBLE_CLICK FOR G_TREE.

Max

Re: Simple tree view control

Former Member — Fri, 23 Sep 2005 08:29:07 GMT

Hi,

GO through this link

http://www.sapdevelopment.co.uk/reporting/alv/alvtree.htm

Hope this helps.

Kindly reward points and close the thread if ur problem got solved or else revert back with queries.

Re: Simple tree view control

Former Member — Fri, 23 Sep 2005 14:17:32 GMT

Hi Max,

Thanx for ur reply ,well could u be a bit more elaborate in this areas

1.In export parameter we used 'node_selection_mode = cl_simple_tree_model=>node_sel_mode_single' creating an instance of gtree ?

*create a simple tree model instance

CREATE OBJECT g_tree

EXPORTING

node_selection_mode = cl_simple_tree_model=>node_sel_mode_single

2.wat does this mean

create the view (control) of the tree model

3.Wat is event-eventid ,For event DOUBLE_CLICK it uses an attribute which is unique eventid , how can i find eventids for other events

event-eventid = cl_simple_tree_model=>eventid_node_double_click.

event-appl_event = 'X'. " process PAI if event occurs

APPEND event TO events.

Thanks,

Azee

Re: Simple tree view control

Former Member — Fri, 23 Sep 2005 14:30:04 GMT

1. You're creating your tree in which only single

selection (of node) is allowed:

The class cl_simple_tree_model has a constant static attribute (CLASS-DATA) called node_sel_mode_single whose value is 0, so

you can write:

CREATE OBJECT g_tree

EXPORTING

node_selection_mode =

cl_simple_tree_model=>node_sel_mode_single.

CREATE OBJECT g_tree

EXPORTING

node_selection_mode = 0.

cl_simple_tree_model=>node_sel_mode_single mean you want use attribute node_sel_mode_single of class cl_simple_tree_model.

2. To show a TREE needs a customer container, so you

create a screen with a container.

Check the data g_custom_container, it should be filled with the name of container. You can see the container by screen painter.

3. See the class cl_simple_tree_model to find other event by transaction SE24;

Max

Message was edited by: max bianchi