GTK4 tooltip example

tooltip.c

/** tooltip.c	
 *
 * COMPILE
 *
 * gcc `pkg-config --cflags gtk4` -o tooltip tooltip.c `pkg-config --libs gtk4`
 *
 * RUN
 *
 * ./tooltip
 */

#include <gtk/gtk.h>

// Not strictly necessary, but here for maximum portability.
#if GLIB_CHECK_VERSION(2, 74, 0)
static int app_flags = G_APPLICATION_DEFAULT_FLAGS;
#else
static int app_flags = G_APPLICATION_FLAGS_NONE;
#endif

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

	window = gtk_application_window_new( app );

	// You can add tooltip text to any GtkWidget. I used a GtkButton.
	// You could just as easily use a GtkLabel by itself, or a GtkBox.
	button = gtk_button_new_with_label( "hover here" );

	gtk_widget_set_tooltip_text( button, "hello world" );

	gtk_window_set_child( GTK_WINDOW( window ), button );

	gtk_widget_show(window);
}

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

	puts("hover over the window to see the tooltip");

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

	return status;
}