# Statusbar (C)

Monica Kochofar
monicakochofar@gmail.com 2012
Enviar mensajes de menor importancia al usuario
Daniel Mustieles
daniel.mustieles@gmail.com 2011 - 2014
Nicolás Satragno
nsatragno@gmail.com 2012 - 2013
Jorge González
jorgegonz@svn.gnome.org 2011

# Statusbar

Esta barra de estado se usa para demostrar cómo se apilan los mensajes en un orden «último dentro, primero fuera». Siempre se muestra el mensaje en la parte superior de la pila.

#include <gtk/gtk.h>

/*Callback function in which pushes an item onto the statusbar*/ static void push_item (GtkWidget *widget, gpointer data) { GtkWidget *status_bar = data;

/*Create a context id, which is used to uniquely identify *the source of a message*/ guint context_id = gtk_statusbar_get_context_id (GTK_STATUSBAR (status_bar), "Statusbar example");

/*Count is used to keep track of the amount of items the user is pushing/popping*/ static int count = 1; char hold_output[20];

/*This is a safer form of the standard sprintf () function. The output is gauranteed in this case to not exceed 20 characters, and the result is stored into the 'hold_output' variable*/ g_snprintf (hold_output, 20, "Item %d", count++); gtk_statusbar_push (GTK_STATUSBAR (status_bar), context_id, hold_output); }

/*Callback function that is used to pop an item off the statusbar*/ static void pop_item (GtkWidget *widget, gpointer data ) { GtkWidget *status_bar = data; guint context_id = gtk_statusbar_get_context_id (GTK_STATUSBAR (status_bar), "Statusbar example");

gtk_statusbar_pop (GTK_STATUSBAR (status_bar), context_id); }

static void activate (GtkApplication *app, gpointer user_data) { GtkWidget *grid; GtkWidget *window; GtkWidget *status_bar; GtkWidget *pop_button; GtkWidget *push_button;

/*Create a window with a title, border width, and a default size**/ window = gtk_application_window_new (app); gtk_window_set_default_size (GTK_WINDOW (window), 220, 100); gtk_window_set_title (GTK_WINDOW (window), "Statusbar Example"); gtk_container_set_border_width (GTK_CONTAINER(window), 10);

/*Create the status bar, which is held in the global variable*/ status_bar = gtk_statusbar_new ();

/*Create the buttons with labels*/ push_button = gtk_button_new_with_label ("push item"); pop_button = gtk_button_new_with_label ("pop last item");

/*Create the grid, and attach the buttons/statusbar accordingly*/ grid = gtk_grid_new (); gtk_grid_attach (GTK_GRID (grid), push_button, 0,1,1,1); gtk_grid_attach (GTK_GRID (grid), pop_button, 0,2,1,1); gtk_grid_attach (GTK_GRID (grid), status_bar, 0,3,1,1);

/*Connecting the clicked signals to the corresponding callback functions*/ g_signal_connect (GTK_BUTTON (push_button), "clicked", G_CALLBACK (push_item), status_bar); g_signal_connect (GTK_BUTTON (pop_button), "clicked", G_CALLBACK (pop_item), status_bar);

/*Attach the grid holding the child widgets onto the window, and show all*/ gtk_container_add (GTK_CONTAINER (window), grid); gtk_widget_show_all (window); }

int main (int argc, char **argv) { GtkApplication *app; int status;

app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE); g_signal_connect (app, "activate", G_CALLBACK (activate), NULL); status = g_application_run (G_APPLICATION (app), argc, argv); g_object_unref (app);

return status; }

En este ejemplo se usa lo siguiente:

GtkApplication

GtkWindow

GtkStatusBar

Funciones de cadenas útiles

GtkGrid