/* ----------------------------------------------------------------------- * The "Hello World" applet. This is a very simple applet that puts up * a button, which when pressed destroys itself (since we can't really exit * an applet per se). * ----------------------------------------------------------------------- */ package sub_arctic.test; /* import various pieces of the sub_arctic toolkit that we need */ import sub_arctic.lib.interactor_applet; import sub_arctic.lib.base_parent_interactor; import sub_arctic.lib.button; import sub_arctic.lib.interactor; import sub_arctic.input.callback_object; import sub_arctic.input.event; import sub_arctic.constraints.std_cnstr; /* We use a new subclass of interactor_applet (which is an applet capable of * hosting a sub_arctic interface). */ public class hello_world extends interactor_applet implements callback_object { /* initialization of sub_arctic interface when applet starts */ public void build_ui(base_parent_interactor top) { /* create a button centered in the top level interactor */ button goodbye = new button("Goodbye", this); goodbye.set_x_constraint(std_cnstr.centered(PARENT.W(), 0)); goodbye.set_y_constraint(std_cnstr.centered(PARENT.H(), 0)); /* make the button a child of the top level */ top.add_child(goodbye); } /* handle callback from the button. */ public void callback(interactor from, event evt, int cb_num, Object cb_parm) { /* remove the button from the interface (since we can't exit) */ if (from.parent() != null) from.parent().remove_child(from); } };