GTK+ 2.0 Tutorial
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# Arrows

The Arrow widget draws an arrowhead, facing in a number of possible directions and having a number of possible styles. It can be very useful when placed on a button in many applications. Like the Label widget, it emits no signals.

There are only two functions for manipulating an Arrow widget:

    GtkWidget *gtk_arrow_new( GtkArrowType   arrow_type,
                              GtkShadowType  shadow_type );

    void gtk_arrow_set( GtkArrow      *arrow,
                        GtkArrowType   arrow_type,
                        GtkShadowType  shadow_type );

The first creates a new arrow widget with the indicated type and appearance. The second allows these values to be altered retrospectively. The `arrow_type` argument may take one of the following values:

      GTK_ARROW_UP
      GTK_ARROW_DOWN
      GTK_ARROW_LEFT
      GTK_ARROW_RIGHT

These values obviously indicate the direction in which the arrow will point. The `shadow_type` argument may take one of these values:

      GTK_SHADOW_IN
      GTK_SHADOW_OUT (the default)
      GTK_SHADOW_ETCHED_IN
      GTK_SHADOW_ETCHED_OUT

Here's a brief example to illustrate their use.

    #include <gtk/gtk.h>

    /* Create an Arrow widget with the specified parameters
     * and pack it into a button */
    static GtkWidget *create_arrow_button( GtkArrowType  arrow_type,
                                           GtkShadowType shadow_type )
    {
      GtkWidget *button;
      GtkWidget *arrow;

      button = gtk_button_new ();
      arrow = gtk_arrow_new (arrow_type, shadow_type);

      gtk_container_add (GTK_CONTAINER (button), arrow);

      gtk_widget_show (button);
      gtk_widget_show (arrow);

      return button;
    }

    int main( int   argc,
              char *argv[] )
    {
      /* GtkWidget is the storage type for widgets */
      GtkWidget *window;
      GtkWidget *button;
      GtkWidget *box;

      /* Initialize the toolkit */
      gtk_init (&argc, &argv);

      /* Create a new window */
      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

      gtk_window_set_title (GTK_WINDOW (window), "Arrow Buttons");

      /* It's a good idea to do this for all windows. */
      g_signal_connect (G_OBJECT (window), "destroy",
                        G_CALLBACK (gtk_main_quit), NULL);

      /* Sets the border width of the window. */
      gtk_container_set_border_width (GTK_CONTAINER (window), 10);

      /* Create a box to hold the arrows/buttons */
      box = gtk_hbox_new (FALSE, 0);
      gtk_container_set_border_width (GTK_CONTAINER (box), 2);
      gtk_container_add (GTK_CONTAINER (window), box);

      /* Pack and show all our widgets */
      gtk_widget_show (box);

      button = create_arrow_button (GTK_ARROW_UP, GTK_SHADOW_IN);
      gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);

      button = create_arrow_button (GTK_ARROW_DOWN, GTK_SHADOW_OUT);
      gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);

      button = create_arrow_button (GTK_ARROW_LEFT, GTK_SHADOW_ETCHED_IN);
      gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);

      button = create_arrow_button (GTK_ARROW_RIGHT, GTK_SHADOW_ETCHED_OUT);
      gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 3);

      gtk_widget_show (window);

      /* Rest in gtk_main and wait for the fun to begin! */
      gtk_main ();

      return 0;
    }

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