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