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ExoXsessionClient

ExoXsessionClient — Lightweight session management support

Synopsis


#include <exo/exo.h>


            ExoXsessionClient;
ExoXsessionClient* exo_xsession_client_new_with_group
                                            (GdkWindow *leader);
GdkWindow*  exo_xsession_client_get_group   (ExoXsessionClient *client);
void        exo_xsession_client_set_group   (ExoXsessionClient *client,
                                             GdkWindow *leader);
gboolean    exo_xsession_client_get_restart_command
                                            (ExoXsessionClient *client,
                                             gchar ***argv,
                                             gint *argc);
void        exo_xsession_client_set_restart_command
                                            (ExoXsessionClient *client,
                                             gchar **argv,
                                             gint argc);

Object Hierarchy


  GObject
   +----ExoXsessionClient

Properties


  "group"                GdkWindow             : Read / Write
  "restart-command"      GStrv                 : Read / Write

Signal Prototypes


"save-yourself"
            void        user_function      (ExoXsessionClient *client,
                                            gpointer user_data);

Description

This module provides application developers with lightweight session management functions, based on the X11R5 session management protocol. The X11R5 session management protocol is very limited in its functionality and flexibility compared to the newer X11R6 session management protocol (XSMP), but - on the other hand - offers several advantages for applications that do not need the complicated features of the XSMP. Most importantly, the setup is much easier and faster than with XSMP, because no special actions must be taken.

So, in case your application is simple in its session management requirements, e.g. it only needs to tell the session manager its restart command, you may want to use the ExoXsessionClient instead of a full featured XSMP client.

Lets say, for example, you are developing a text editor, which should provide basic session management support, limited to proper restarting all editor windows that where left open when you logged off the X session. In case the user was editing a file when logging off, the same file should be opened in the window on next startup.

Example 3. Texteditor with ExoXsessionClient

static gchar *open_file_name = NULL;

static void
save_yourself (ExoXsessionClient *client)
{
  gchar *argv[2];

  if (open_file_name != NULL)
    {
      argv[0] = "myeditor";
      argv[1] = open_file_name;

      exo_xsession_client_set_restart_command (client, argv, 2);
    }
  else
    {
      argv[0] = "myeditor";

      exo_xsession_client_set_restart_command (client, argv, 1);
    }
}

/* ... */

int
main (int argc, char **argv)
{
  ExoXsessionClient *client;
  GdkDisplay        *display;
  GdkWindow         *leader;
  GtkWidget         *window;

  gtk_init (&argc, &argv);

  if (argc > 1)
    open_file_name = argv[1];

  /* create the main window */
  window = create_window();

  /* setup the session client */
  display = gtk_widget_get_display (window);
  leader = gdk_display_get_default_group (display);
  client = exo_xsession_client_new_with_group (leader);
  g_signal_connect (G_OBJECT (client), "save-yourself",
                    G_CALLBACK (save_yourself), NULL);

  /* ... */
}

This example demonstrates the basic handling of ExoXsessionClient. It is oversimplified, but we hope you get the point. The rule of thumb is, use ExoXsessionClient if you can store all session data in the restart command, else use a full-featured XSMP client.

Details

ExoXsessionClient

typedef struct _ExoXsessionClient ExoXsessionClient;

exo_xsession_client_new_with_group ()

ExoXsessionClient* exo_xsession_client_new_with_group
                                            (GdkWindow *leader);

Creates a new ExoXsessionClient and associates it with the group, which is lead by leader.

leader : The client leader window of the group.
Returns : A newly allocated ExoXsessionClient.

exo_xsession_client_get_group ()

GdkWindow*  exo_xsession_client_get_group   (ExoXsessionClient *client);

client : An ExoXsessionClient.
Returns : The client leader window of the group with which client is associated or NULL.

exo_xsession_client_set_group ()

void        exo_xsession_client_set_group   (ExoXsessionClient *client,
                                             GdkWindow *leader);

client : An ExoXsessionClient.
leader : The client leader window of a group or NULL.

exo_xsession_client_get_restart_command ()

gboolean    exo_xsession_client_get_restart_command
                                            (ExoXsessionClient *client,
                                             gchar ***argv,
                                             gint *argc);

Retrieves the restart command previously set on client. The result is stored in argv and should be freed using g_strfreev() when no longer needed.

See exo_xsession_client_set_restart_command() for further explanation.

client : An ExoXsessionClient.
argv : Pointer to the location where the pointer to the argument vector should be stored to.
argc : Pointer to the location where the number of arguments should be stored to or NULL.
Returns : TRUE on success, else FALSE.

exo_xsession_client_set_restart_command ()

void        exo_xsession_client_set_restart_command
                                            (ExoXsessionClient *client,
                                             gchar **argv,
                                             gint argc);

Sets the WM_COMMAND property on the client leader window, which instructs the session manager (or session-enabled window manager) how to restart the application on next login.

This function can only be used if client is associated with a client leader window.

If argc is specify as -1, the argument vector argv is expected to be NULL-terminated and argc will be automatically calculated from argv.

Please take note, that gtk_init() automatically sets the WM_COMMAND property on all client leader windows that are implicitly created by Gtk+. So, you may only need to call this function in response to the ::save-yourself signal.

client : An ExoXsessionClient.
argv : The argument vector.
argc : The number of arguments in argv or -1.

Properties

The "group" property

  "group"                GdkWindow             : Read / Write

The "restart-command" property

  "restart-command"      GStrv                 : Read / Write

Signals

The "save-yourself" signal

void        user_function                  (ExoXsessionClient *client,
                                            gpointer user_data);

This signal is emitted when client receives a WM_SAVE_YOURSELF message from the session manager or the window manager on the specified client leader window.

client : An ExoXsessionClient.
user_data :user data set when the signal handler was connected.
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