Context Menu

Use

The context menu (right-hand mouse button or SHIFT+F10) allows you to display a context-sensitive menu. The context is defined by the position of the mouse pointer when the user requests the menu.

A context menu allows the user to choose functions that are relevant to the current context.

Features

If you want to provide a context menu in a custom control, you must register the event that is triggered when the user clicks the right mouse button ( context_menu). The event triggered when the user chooses an entry from the context menu ( context_menu_selected) is either registered directly by the control wrapper (for example, SAP Tree), or must be registered explicitly (SAP Picture).

If the user requests a context menu for an object, the application program is called using the normal event mechanism. In the event handler method for the context_menu event, the program receives a menu reference as an event parameter. The program uses the menu reference to construct the required menu. You can either predefine a context menu using the Menu Painter, or construct one dynamically in your program. The context menu is displayed automatically after the event handler method.

When the user chooses an entry from the context menu, a further event is triggered, which is passed to the application program. Accordingly, you must register a further handler method for this event. Use the handler method to analyze the function code. This is passed to the method as an event parameter.

Activities

You register for the event context_menu and context_menu_selected using the set_registered_events method. The identification of the result depends on the relevant control. This is described in the related documentation.
You must also define event handler methods for both events in your application.

Caution

The SAP Tree is an exception in terms of registering events. In the SAP Tree, you only have to register the event context_menu. The event context_menu_selected is automatically registered by the control wrapper.

Constructing a Context Menu

When you implement the handler method for the event context_menu, you must assign the menu to the control. You may need to check the particular context in which the user requested the context menu.

You construct the context menu using class CL_CTMENU. Almost all control wrappers pass a context menu object reference as an event parameter of the context_menu event. If this is not the case (for example, SAP Picture), you must create an object of the class CL_CTMENU.

You can use the following methods with the context menu object:

Method	Description
LOAD_GUI_STATUS	Loads a context menu that you have already defined in the Menu Painter (see below)
ADD_FUNCTION	Adds a function
ADD_MENU	Adds a menu that you defined in the Menu Painter
ADD_SUBMENU	Adds a menu that you defined in the Menu Painter as a submenu
ADD_SEPARATOR	Adds a separator
RESET	Reset to initial value
HIDE FUNCTIONS	Hides a function
SHOW_FUNCTIONS	Shows a function
DISABLE_FUNCTIONS	Inactivates a function
ENABLE_FUNCTIONS	Activates a function

The context menu is displayed automatically after the event handler method. The SAP Picture Control and SAP Toolbar Control are an exception to this. With these controls, you must display the context menu explicitly using the method display_context_menu.

Evaluating the Function Code

You interpret the user's choice from the context menu in the handler method for the event context_menu_selected. You can identify and react to this choice using the function code.