# Statusleiste (C)

Monica Kochofar
monicakochofar@gmail.com 2012
Report messages of minor importance to the user
Mario Blättermann
mario.blaettermann@gmail.com 2011, 2013

# Statusleiste

This statusbar is used to demonstrate how messages are stacked in a last-in-first-out order. The message at the top of the stack is always the one displayed.

#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 guaranteed 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; }

In this sample we used the following:

GtkApplication

GtkWindow

GtkStatusBar

String Utility Functions

GtkGrid