Controller/Context Editor
The Controller/Context Editor provides graphical support for the creation of controller context trees and the subsequent definition of the data flow between two Web Dynpro entities. The Controller/Context Editor is used for creating the context structures of all controller types.
The Editor supports the following tasks:
· Creating a structure for the automatically generated context of a controller. This is a tree structure with nodes and attributes. The structure elements can be model nodes and model attributes or value nodes and value attributes.
· Defining the data flow between the model, the view contexts, and the controller contexts. In the data transfer between the view context and the controller context, data binding takes place – that is, a reference is passed. The same applies to the data flow definition between the Web Dynpro model and the controller of an application. However, if data is passed between the controllers of an application, these are data copies (mapping).
The
Controller/Context Editor is made up of two parts: The first is an editable
area with 
Context as the main
node; this is the starting point for the definition of the context structure
with the nodes and attributes. You use the Context node to create, display and delete
nodes. The second editor area
initially displays the elements of the Web Dynpro application that are
referenced by the Web Dynpro component. Which elements are displayed depends on the Web
Dynpro application entity that is currently being edited in the
Controller/Context Editor. When
you edit a custom controller, the models and controllers referenced by the Web
Dynpro component are displayed in the area on the right. From these referenced entities, you select the one
which, as a source element, will be available for the current data flow
definition by choosing a corresponding button. In this second area of the Controller/Context
Editor, the selection of the data source is followed by the display of the
structures and data of the source element – that is, the model or the
controller. If you use the
Controller/Context Editor to edit a view context, the controllers referenced
by the component are displayed as possible data sources in the area on the
right.
A dialog box is also available that provides graphical support when defining the mapping, data binding, or model binding. In the source structure, you can select the data to be transferred; you can even select entire structures.
Opening the Controller/Context Editor
You start the Editor from the Web Dynpro entity for which you want to define a context tree. This can be a Web Dynpro component, a controller, or a view. In the Web Dynpro Explorer, choose the context menu entry Edit. In the right screen area, the Controller/Context Editor is started in the Context tab.
Additional Information
The procedure for referencing the various Web Dynpro entities in preparation for the data flow definition is described in the following sections:
Referencing a Custom Controller
For information on creating a tree hierarchy with nodes and attributes for the context definition, refer to Context Structure.