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The upshot of all this is that the menu item s target object, whether configured explicitly or found in the responder chain, is the one that decides whether the menu item should be enabled (at the current time) or not. This means that you have complete dynamic control over each menu item. By implementing validateUserInterfaceItem: in each of your classes containing methods that are called by menu items, whether directly or through the responder chain, you can define some logic that the menu system calls at the right time, and automatically enables or disables each menu item based on what you return. Let s illustrate this with an example. We ll create a new window in our nib file, matched by a new delegate class just for that window, which will implement validateUserInterfaceItem: to handle the state of a menu item. In a real application, you would probably base it on the content of a model object, but for simplicity s sake, we ll enable or disable a menu item based on what s selected in the window. Start by creating a new class in Xcode, just a plain NSObject subclass called ListWindowDelegate. In its header, define an integer property called selectedTag, which we ll later bind to a GUI object (add the lines that are shown in bold):

void SayHello( void ) {

Add a semicolon just before the left curly brace at the end of the line, just as you did earlier, in the definition of main(). Here s what the line looks like now:

We re going to be getting hot and social OK, so it s online social, not the face-to-face stuff you need to get good at to woo investors But it s definitely a step in the right direction Onward and upward!.

#import <Cocoa/Cocoa.h> @interface ListWindowDelegate : NSObject {

void SayHello( void ) ;{

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OK, enough about the hook. Let s look at the other parts of the Unique Selling Proposition pattern, starting with an expanded view of this whole Should I trust you thing: credibility markers. There are two aspects to this part of the USP: (1) what you say and how you say it and (2) whether you ve competently included the standard things most online buyers look for in order to pass judgment on a site. Let s deal with the latter first. Here s the short list.

In the matching .m file, we re going to synthesize the accessors for the selectedTag property, implement the specialAction: method that a menu item will be connected to with target/action via the First Responder proxy, and implement the validateUserInterfaceItem: method.

Try to build again. This time, the compiler got so confused by the extra semicolon, it reported five errors instead of just one, and threw in four warnings to boot (see Figure 4-11). Notice, however, that the very first error message gives you a pretty good idea of what is going on. It complains about a syntax error before the left curly brace (before { token). The compiler is reading your source code and making its way down main.c when it encounters what it thinks is a function definition. But then, just when it expects an open curly brace, it finds a semicolon. It thinks, Hrm. That s not right. Better report an error.

Figure 4-11. This time, the Build Results window lists five errors and four warnings, all because of a little semicolon.

Do you identify your company by providing its logo, physical/mailing address, phone number, and general e-mail If not, why would you expect people to give an anonymous page their credit card info Now, I realize that startups in some parts of the world eastern Europe and Russia come to mind think their customers in the United States will penalize them. Some will, although not as many as you think and not if you do the right things.5 But the cost of not having this information on your site is far higher. Did you include a copyright notice and, if you mention other companies products on the page, a trademark disclaimer You re running a business; these are the signposts of a business.

#import "ListWindowDelegate.h" @implementation ListWindowDelegate @synthesize selectedTag; - (BOOL)validateUserInterfaceItem: (id <NSValidatedUserInterfaceItem>)anItem { SEL theAction = [anItem action]; if (theAction == @selector(specialAction:) ) { if (self.selectedTag == 13013) { return YES; } else { return NO; } } // default, in case it's not the action we care about return YES; } - (void)specialAction:(id)sender { NSRunAlertPanel(@"Boy Howdy!", @"That's some mighty special action you got there!", nil, nil, nil); } @end

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