SAP DYNPRO CFW ABEXA documentation, setup help and example usage

ARTIClE

Screens, CFW
The example illustrates the use of different GUI controls on a screen.

ABAP_SOURCE_CODE
ABAP_EXEC

ABAP_DESCRIPTION
On the screen layout of screen 100 is a Custom Control named
CUSTOM_CONTROL that covers the entire screen area. In the flow logic, both dialog modules STATUS_0100 and CANCEL are called at which the addition AT EXIT-COMMAND is used for PAI.
In GUI status SCREEN_100 , the common symbols of the status bar are occupied with function codes of the type E . The PAI module only serves to exit the program. The most important action to PBO is calling the static method create_screen of the local class screen_handler , in which an object of this class is created.
The instance constructor of the class screen_handler generates container controls for a Picture Control and a Tree Control
and afterwards both application controls.

First, a Docking Control is created with the local reference variable l_docking . By transferring the constant

dock_at_left of the class CL_GUI_DOCKING_CONTAINER to the parameter side , a new area is created on the left side of the screen with a width of 135 pixels.

This screen area is split into two horizontal areas. This is achieved via the local reference variable l_splitter , which creates an object of the class CL_GUI_SPLITTER_CONTAINER and transfers the reference to the Docking Control to the parameter parent .

Using the functional method get_container , the references to both areas of the splitter-control are determined in the local reference variables l_container_top and l_container_bottom . Afterwards, the application-controls Picture and Tree are generated, at which the parameter parent of each constructor receives one of the references to the areas of the splitter control.

By calling the method set_registered_events , the doubleclick event for the nodes of the tree are activated as system event. The method handle_node_double_click is registered as event handler.
When leaving the instance constructor, all reference variables are deleted. However, the control objects generated in the constructor with local reference variables are not collected by the garbage collection, as they are maintained by references from the CFW .
The method fill_picture imports an image file in GIF format
from the MIME Repository into a byte string l_pict_wa , which is then filled into an internal table l_pict_tab . The function module DP_CREATE_URL generates an URL address for this table in the local variable l_url , which is passed to the method load_picture_from_url of the Picture Control .
The method fill_tree generates the tree structure of the tree control in the internal table l_node_table of the row structure ABDEMONODE . Every row of the table describes a node of the tree structure and must have a unique node key node_key for it. The components relatkey and relatship describe the relationships among the nodes.
The node table is generated from the content of the database table SPFLI . At the subnodes, the standard icons for non-expanded and expanded nodes are replaced with aircraft icons.
The event handler method handle_node_double_click imports the parameter node_key of the event node_double_click of the class CL_GUI_SIMPLE_TREE , which contains the key of the selected node. Depending on the content, the methods fill_html or
fill_list are called.
When the method fill_html is called for the first time, it generates an object of the class CL_GUI_HTML_VIEWER and links the associated HTML control with the area of the container control to which the reference in container_html points (with the
Custom Control on the screen). According to the selected node, the web address of an airline is read and handed over to the method
show_url of the HTML control , by which the Homepage of the airline is displayed.
The method fill_list generates a dialog box container and an
ALV Grid Control that is displayed in the dialog box. The event handler close_box is registered for the dialog box container. Activation using the method set_registered_events is not necessary here, as the event is activated by the class itself as system event when the object is generated. A list is generated for the selected nodes. By assigning values to some components of the structure
l_list_layout of the type lvc_s_layo , it is determined that the list title in displayed in small format, and that the column width of the list is optimized, and that the list should not have an application toolbar. By calling the method
set_table_for_first_display of the ALV Grid Control , the list is displayed in the dialog box.
You use the event handler method close_box to close the dialog box. To do this, you call the methods free of the concerned controls one after another and then initialize the respective reference variables. After that, if a node is selected to generate a list, both controls are created again in the method fill_list . All other controls of the program cannot be deleted by the user and will be available until the program ends.

Note
The class CL_SALV_TABLE and other classes with the prefix
CL_SALV_ meanwhile offer more comfortable ways of displaying ALV Controls .

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