Tài liệu Creating Applications with Mozilla-Chapter 12. Remote Applications-P5 doc

Chapter 12. Remote Applications-P5

12.8. Signed Remote Snake Game

In this section, we look at an enhanced version of the Snake game presented

earlier in the chapter. The enhanced version uses XPConnect to provide a

total full-screen display of the game on the Windows platform as a remote

application.

12.8.1. How to Expand Mozilla to Full Screen

The best way to expand Mozilla to a full screen mode is through full-screen

functions provided in an instance of navigator.xul. These functions run

in the Windows build of Mozilla via the Full Screen item in the View menu.

These functions also work in Linux and Mac, but do not provide 100% full￾screen mode, as some menus and titlebars still show.

The problem here is the current window's navigator.xul document,

which needs to be accessed to get these full-screen functions. A document

loaded in that window just can't use something like window.parent to

get to it, so another route must be found.

This route runs through the nsIWindowMediator interface by the way of

XPConnect. It gives access to the current browser window's

navigator.xul document's window object. Example 12-13 includes the

code for this window access process, along with the functions used to create

the full-screen effect.

Example 12-13. Function for switching screen modes

netscape.security.PrivilegeManager.enablePrivilege(

"UniversalXPConnect");

const

MEDIATOR_CONTRACTID="@mozilla.org/appshell/window￾mediator;1";

const

nsIWindowMediator=Components.interfaces.nsIWindowMe

diator;

var windowManager=

Components.classes[MEDIATOR_CONTRACTID].getService(

nsIWindowMediator);

var hideSidebar=true;

var isRegular=true;

function switchScreen( )

{

if(isRegular)

{

try {

netscape.security.PrivilegeManager.enablePrivilege(

"UniversalXPConnect");