vb.net barcode printing 4: GUI Components in Java

Generating Data Matrix in Java 4: GUI Components

CHAPTER 4: GUI Components
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Pretty straightforward, so you may wonder why we showed you the first version, where everything is all packed together. Basically, the first version is a kind of Objective-C code that you re likely to encounter in the wild at some point, so it s good to be able to try to eyeball it a little. Not because it s technically superior in some way (it s not), but simply because some people consider the highly nested version to be more readable in some ways, and just prefer to write their code that way. The position of the brackets, combined with features of Xcode s text editor, lets you easily do some things with the former version that take a bit more time with the latter. For example, double-clicking on a bracket in Xcode selects the entire bracketed expression, including the brackets themselves, which means you can easily select an entire method invocation, including the receiver, the method name, and all arguments, in a single double-click. This can be a huge help both when editing code and also browsing/reading code. On the other hand, the second form we showed you can be helpful when debugging your application. Just set a breakpoint, and you ve got a full complement of intermediate variables ready to divulge their contents to you. Ultimately, which style you lean toward is a matter of personal taste and practicality. Use whatever works best for you in the situation at hand. Until you ve gotten a bit more Cocoa experience under your belt, you re probably better off sticking with the latter style, which shows more clearly the sequence of execution. For now, either of the alternatives shown above should work at the end of the updateDetailViews method. Compile and run, and verify that the correct primary motivation, Revenge, is shown in the GUI. Finally, it s time to display the powers attribute. Like the primaryMotivation, the villain s powers are shown in a matrix of button cells. This time, however, the button cells are checkboxes, and any number of them can be selected (or checked ). Instead of a single string, the powers attribute is an NSArray containing all the relevant strings for the villain we re looking at. We ll start off with something very similar to what we added for the primaryMotivation attribute: a new class method called powers:
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// add to "@interface VillainTrackerAppDelegate (privateMethods)" section: + (NSArray *)powers; // add to "@implementation VillainTrackerAppDelegate (privateMethods)" section: + (NSArray *)powers { static NSArray *powers = nil; if (!powers) { powers = [[NSArray alloc] initWithObjects:@"Strength", @"Intellect", @"Psionics", @"Imperviousness", @"Speed", @"Stealth", @"Fighting ability", @"Time control", @"Cosmic consciousness", @"Size", @"Special weapon attack", @"Leadership", nil]; } return powers; }
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Like the motivations method, this method creates an array of strings whose indexes in the array correspond to the tags defined in a matrix in the nib file. Now we just have to add a bit of code to selectively check all the appropriate checkboxes. Add this code to the end of the updateDetailViews method:
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CHAPTER 4: GUI Components
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[powersView deselectAllCells]; for (NSString *power in [[self class] powers]) { if ([[villain objectForKey:kPowers] containsObject:power]) { [[powersView cellWithTag: [[[self class] powers] indexOfObject:power]] setState:NSOnState]; } }
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That bit of code should be pretty easy for you to grasp by now. First it deselects all the cells, so we start off with a clean slate of unchecked checkboxes. Then it goes through each named power from our master list of powers, checks to see if our villain s powers attribute contains a matching string, and if so, sets that cell s state to NSOnState, which means the checkbox is checked. The one new thing to notice here is the special for construct. This is something called fast enumeration, an addition to the latest version of Objective-C that works unlike any form of for in C. It basically takes a collection (typically an NSArray) on the right side of the in, and iterates through it, assigning each object in the collection to the variable specified on the left side of the in, one at a time, then executing the subsequent curly-brace-wrapped code. Now compile and run your application, and you should see the relevant checkboxes selected in the display: Intellect and Leadership in the case of Lex Luthor.
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