Graphics.UI.Gtk.Embedding.Socket

Container for widgets from other processes

Detail

Together with Plug, Socket provides the ability to embed widgets from one process into another process in a fashion that is transparent to the user. One process creates a Socket widget and, passes the that widget's window ID to the other process, which then creates a Plug with that window ID. Any widgets contained in the Plug then will appear inside the first applications window.

The socket's window ID is obtained by using socketGetId. Before using this function, the socket must have been realized, and for hence, have been added to its parent.

• Obtaining the window ID of a socket.

socket <- socketNew
widgetShow socket
containerAdd parent socket

-- The following call is only necessary if one of
-- the ancestors of the socket is not yet visible.
--
widgetRealize socket
socketId <- socketGetId socket
putStrLn ("The ID of the sockets window is " ++ show socketId)

Note that if you pass the window ID of the socket to another process that will create a plug in the socket, you must make sure that the socket widget is not destroyed until that plug is created. Violating this rule will cause unpredictable consequences, the most likely consequence being that the plug will appear as a separate toplevel window. You can check if the plug has been created by calling socketHasPlug. If this returns True, then the plug has been successfully created inside of the socket.

When Gtk+ is notified that the embedded window has been destroyed, then it will destroy the socket as well. You should always, therefore, be prepared for your sockets to be destroyed at any time when the main event loop is running.

The communication between a Socket and a Plug follows the XEmbed protocol. This protocol has also been implemented in other toolkits, e.g. Qt, allowing the same level of integration when embedding a Qt widget in Gtk+ or vice versa.

Class Hierarchy

| GObject
| +----Object
| +----Widget
| +----Container
| +----Socket

Types

data Socket

Instances

Eq Socket

Ord Socket

GObjectClass Socket

ContainerClass Socket

WidgetClass Socket

SocketClass Socket

class ContainerClass o => SocketClass o

Instances

SocketClass Socket

castToSocket :: GObjectClass obj => obj -> Socket

gTypeSocket :: GType

toSocket :: SocketClass o => o -> Socket

data NativeWindowId

The identifer of a window of the underlying windowing system.

Instances

Eq NativeWindowId

Show NativeWindowId

Constructors

socketNew :: IO Socket

Create a new empty Socket.

Socket is a Container for foreign applications that support the XEMBED protocol. To connect two applications the NativeWindowId has to be passed either from this socket to the other application's Plug or vice versa.

Methods

socketHasPlug :: SocketClass s => s -> IO Bool

socketAddId

Arguments

:: SocketClass self

=> self

-> NativeWindowId

windowId - the window ID of a client participating in the XEMBED protocol.

-> IO ()

Adds an XEMBED client, such as a Plug, to the Socket. The client may be in the same process or in a different process.

To embed a Plug in a Socket, you can either create the Plug with Graphics.UI.Gtk.Embedding.Plug.plugNew Nothing, call plugGetId to get the window ID of the plug, and then pass that to the socketAddId, or you can call socketGetId to get the window ID for the socket, and call plugNew passing in that ID.

The Socket must have already be added into a toplevel window before you can make this call.

socketGetId :: SocketClass self => self -> IO NativeWindowId

Gets the window ID of a Socket widget, which can then be used to create a client embedded inside the socket, for instance with plugNew.

The Socket must have already be added into a toplevel window before you can make this call.

socketGetPlugWindow

Arguments

:: SocketClass self

=> self

-> IO (Maybe DrawWindow)

returns the window of the plug if available, or Nothing

Retrieves the window of the plug. Use this to check if the plug has been created inside of the socket.

• Available since Gtk+ version 2.14

Signals

socketPlugAdded :: SocketClass self => Signal self (IO ())

This signal is emitted when a client is successfully added to the socket.

socketPlugRemoved :: SocketClass self => Signal self (IO Bool)

This signal is emitted when a client is removed from the socket. The default action is to destroy the Socket widget, so if you want to reuse it you must add a signal handler that returns True.

Deprecated