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.
/* example-start arrow arrow.c */ #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. */ gtk_signal_connect (GTK_OBJECT (window), "destroy", GTK_SIGNAL_FUNC (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); } /* example-end */ |