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In other words, users would need the ADMIN role to access the gadget editing pages, but any user can use the gadget editing pages to edit the gadgets that he or she submitted to the database This logic can t be easily implemented using simple roles pulled from our ROLE and USER_ROLE_ASSN tables A user s access to the editing pages has to be determined at runtime, using his or her User object and comparing it to the submitter property on the gadget being edited It s actually very easy to implement this dynamic access control logic First, we add a new Boolean property to our gadgetAdmin component, called gadgetSubmitter This property should be true only if the submitter property of the current gadget (the activeGadget property on gadgetAdmin) is the same user as the current authenticated user.

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE plist SYSTEM "file://localhost/System/Library/DTDs/PropertyList.dtd"> <plist version="0.9"> <dict> <key>CFBundleExecutable</key> <string>%%%APPNAME%%%</string> <key>CFBundleIdentifier</key> <string>%%%BUNDLEID%%%</string> <key>CFBundlePackageType</key> <string>APPL</string> <key>CFBundleSignature</key> <string> </string> </dict> </plist>

Note Component images in this chapter use a slightly customized ruby skin with a larger general font

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The Info.plist describes the application to Mac OS X. You re now ready to run Make! Make will build a DinoWar.app bundle that you can double-click (or launch with open Dinowar.app in the same directory). But, uh oh! Nothing happens! Unfortunately, you can no longer use the current working directory to find your tileset. This means your window s calculated size is negative. You ll need to make a quick change to the ImageTile class to get around this. The new initializer looks like the following code and uses a special Cocoa function to get access to the Resources directory inside the bundle. Writing it this way allows you to continue to run from the command line when you wish but also work as a bundle.

We implement this property with a single isGadgetSubmitter() method on GadgetAdminBean, where we dynamically determine the value of the property by checking the current user and the submitter of the active gadget:.

class ImageTile def initialize(filename) if ! File.exist (filename) path = OSX::NSBundle.mainBundle.resourcePath.fileSystemRepresentation filename = File.join(path, filename) end @filename @image = @width = @height = end end = filename OSX::NSImage.alloc.initByReferencingFile(filename) @image.size.width @image.size.height

<rich:dropDownMenu> produces a drop-down menu, as shown here:

You probably also want to give the application a menu item to let users quit! Replace the line in CocoaPlayer s initializer that reads app.setMainMenu(OSX::NSMenu.alloc.init) with a call to create_menu. The new method looks like this:

public boolean isGadgetSubmitter() { boolean owner = false; if (getActiveGadget() != null && getActiveGadget().getSubmitter() != null && getUser() != null && getActiveGadget().getSubmitter().equals(getUser())) { owner = true;

class CocoaPlayer def create_menu app = OSX::NSApplication.sharedApplication main_menu = OSX::NSMenu.alloc.initWithTitle("MainMenu") app_item = main_menu.addItemWithTitle_action_keyEquivalent("Apple", nil, "") app_menu = OSX::NSMenu.alloc.initWithTitle("Apple") app_item.setSubmenu(app_menu) quit_item = app_menu.addItemWithTitle_action_keyEquivalent("Quit DinoWars", :terminate_, "q") quit_item.setTarget(app) app.setAppleMenu(app_menu) app.setMainMenu(main_menu) end end

And with your users able to quit, you ve created your first Cocoa application!

Of course, with every menu item you can associate a particular action or action listener to be invoked via Ajax. All the standard Ajax concepts apply here as well, such as reRender. The code to create this menu looks rather simple: <h:form> <rich:toolBar> <rich:dropDownMenu> <f:facet name="label"> <h:outputText value="File" /> </f:facet> <rich:menuItem submitMode="ajax" value="New"/> <rich:menuItem submitMode="ajax" value="Open File..."/> <rich:menuItem submitMode="ajax" value="Close"/> <rich:menuItem submitMode="ajax" value="Close All"/> </rich:dropDownMenu>

} return owner; }

Summary

Whether it s games or business applications, a native user interface will always help woo your users. And RubyCocoa makes native interfaces easy for Ruby on the Mac. You should have enough under your belt now to continue working on the game engine or building user interfaces of your own. A great next step would be to explore some of the many wonderful resources for RubyCocoa online at http://rubycocoa.sourceforge.net/doc/ or www.rubycocoa.com/. This has been a relatively unorthodox look at RubyCocoa. I ve avoided using some of the excellent Cocoa development tools like Xcode and Interface Builder. So there s still plenty more to learn if you re interested. (You can read more about Cocoa in general at www.cocoadev.com.) And next time you re thinking about writing a Ruby application, think about giving it a native user interface. The results can be stunning.

We needed to add another property, user, to GadgetAdminBean, and we inject it from the session scope using an @In annotation:

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