Getting and Modifying Subobjects of a Main Class 

Purpose

The ALV object model includes a large number of classes that you can use to make specific settings. The following graphic compares the class diagram of the three main ALV classes.

Naming Conventions

The classes of the ALV object model are structured that you can usually tell from the names which areas of the ALV output you can change with the methods from these classes.

·        Singular or plural
Often you will find class names that exist in both plural and in singular (such as CL_SALV_COLUMN and CL_SALV_COLUMNS). You can see from the names that in the one class there are methods that only affect a specific object and in the other class the methods are for all of these objects.

·        ALV tool
Many functions are available for all three ALV tools. However, when there are differences between the classes of the ALV tools, you can find the right variant by the name (such as CL_SALV_COLUMN_TABLE, _SALV_COLUMN_HIERSEQ, CL_SALV_COLUMN_TREE)

Get Subobjects

You get the objects for these classes using the Get methods of the three main ALV classes. The following table shows which methods in the main ALV classes provide which subobjects:

Methods of Main ALV Classes to Get Subobjects

Method	Returns Object of Type	Remarks
GET_AGGREGATIONS	CL_SALV_AGGREGATIONS
GET_COLUMNS	CL_SALV_COLUMNS_TABLE or CL_SALV_COLUMNS_HIERSEQ or CL_SALV_COLUMNS_TREE
GET_DISPLAY_SETTINGS	CL_SALV_DISPLAY_SETTINGS	Not in CL_SALV_TREE
GET_EVENT	CL_SALV_EVENTS_TABLE or CL_SALV_EVENTS_HIERSEQ or CL_SALV_EVENTS_TREE
GET_FILTERS	CL_SALV_FILTERS	Not in CL_SALV_TREE
GET_FUNCTIONAL_SETTINGS	CL_SALV_FUNCTIONAL_SETTINGS	Not in CL_SALV_TREE
GET_FUNCTIONS	CL_SALV_FUNCTIONS_LIST	Not in CL_SALV_TREE
	CL_SALV_FUNCTIONS_TREE	Only in CL_SALV_TREE
GET_LAYOUT	CL_SALV_LAYOUT
GET_LEVEL	CL_SALV_HIERSEQ_LEVEL	Only in CL_SALV_HIERSEQ_TABLE
GET_NODES	CL_SALV_NODES	Only in CL_SALV_TREE
GET_PRINT	CL_SALV_PRINT
GET_SELECTIONS	CL_SALV_SELECTIONS	Not in CL_SALV_TREE
	CL_SALV_SELECTIONS_TREE	Only in CL_SALV_TREE
GET_SORTS	CL_SALV_SORTS	Not in CL_SALV_TREE
GET_TREE_SETTINGS	CL_SALV_TREE_SETTINGS	Only in CL_SALV_TREE

 

If one of the classes uses another class, you can also get its objects using the Get methods.

Class Used	Includes Get method	Returns Object of Type
CL_SALV_AGGREGATIONS	GET_AGGREGATION	CL_SALV_AGGREGATION
CL_SALV_COLUMNS_TABLE	GET_COLUMN	CL_SALV_COLUMN
CL_SALV_COLUMNS_HIERSEQ
CL_SALV_COLUMNS_TREE
CL_SALV _FUNCTIONAL_SETTINGS	GET_DROPDOWNS	CL_SALV_DROPDOWNS
	GET_HYPERLINKS	CL_SALV_HYPERLINKS
	GET_TOOLTIPS	CL_SALV_TOOLTIPS
CL_SALV_FUNCTIONS_LIST	GET_FUNCTIONS	CL_SALV_FUNCTION
CL_SALV_FUNCTIONS_TREE
CL_SALV_FILTERS	GET_FILTER	CL_SALV_FILTER
CL_SALV_NODES	GET_NODE	CL_SALV_NODE
CL_SALV_SORTS	GET_SORTS	CL_SALV_SORT

Process Flow

If you have created the internal data table and the instance of the ALV main class, you are able to generate an object for each class used and make the settings as well. To do this, proceed as follows:

·        You declare an object variable for each type of class that you want to use
(such as data: gr_display type ref to cl_salv_display_settings. )

·        You use the respective Get method the main ALV class to get the objects of the corresponding type
(for example gr_display = gr_table->get_display_settings ( ). )

·        You use the methods of the class used to assign the desired properties to the object.
(For example
gr_display->set_striped_pattern(
               value = 'X').
gr_display->set_vertical_lines(
               value = 'X').)

When you have made the settings you display the ALV output with the display method.