# ToggleButton (C)

Monica Kochofar
monicakochofar@gmail.com 2012
A button which retains state
Rafael Fontenelle
rafaelff@gnome.org 2013, 2018

# ToggleButton

When this ToggleButton is in an active state, the spinner spins.

#include <gtk/gtk.h>

/*This is the callback function. It is a handler function which reacts to the signal. In this case, it will cause the spinner to start and stop according to how many times the user presses the button.*/ static void button_toggled_cb (GtkWidget *button, gpointer user_data) { GtkWidget *spinner = user_data;

if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(button))) gtk_spinner_start (GTK_SPINNER (spinner)); else { gtk_spinner_stop (GTK_SPINNER (spinner)); } }

static void activate (GtkApplication *app, gpointer user_data) { GtkWidget *window; GtkWidget *button; GtkWidget *grid; GtkWidget *spinner;

/*Create a window with a title, border width and a default size*/ window = gtk_application_window_new (app); gtk_window_set_title (GTK_WINDOW (window), "ToggleButton Example"); gtk_window_set_default_size (GTK_WINDOW (window), 300, 300); gtk_container_set_border_width(GTK_CONTAINER(window), 30);

/*Create a togglebutton with a label*/ button = gtk_toggle_button_new_with_label ("Start/Stop");

/*Create a spinner, with extra horizontal and vertical space*/ spinner = gtk_spinner_new (); gtk_widget_set_hexpand (spinner, TRUE); gtk_widget_set_vexpand (spinner, TRUE);

/*Create a grid and set the row spacing, attach the togglebutton and spinner onto the grid and position them accordingly*/ grid = gtk_grid_new(); gtk_grid_set_row_homogeneous (GTK_GRID (grid), FALSE); gtk_grid_set_row_spacing (GTK_GRID (grid), 15); gtk_grid_attach (GTK_GRID (grid), spinner, 0, 0, 1, 1); gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 1, 1);

gtk_container_add (GTK_CONTAINER (window), grid);

/*Connecting the toggled signal to the callback*/ g_signal_connect (GTK_TOGGLE_BUTTON (button), "toggled", G_CALLBACK (button_toggled_cb), spinner);

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

GtkSpinner

GtkTogglebutton

GtkGrid