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 */
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;
} |