vb.net barcode printing 10: Windows and Menus and Sheets in Java

Drawing Data Matrix ECC200 in Java 10: Windows and Menus and Sheets

CHAPTER 10: Windows and Menus and Sheets
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changes, switch to Xcode, Build & Run, and you should see that your newest button lets you create windows that beep when you press their buttons, as seen in Figure 10 6.
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Figure 10 6. These windows buttons will beep at you.
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Modal Windows
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Now we re going to move on to a special kind of GUI item, the modal window. Everyone has used modal windows at one time or another, but if you re new to desktop GUI programming, the term may be new to you. Basically, a modal window is one that puts your application in a particular mode. Specifically, a mode where it will only accept input through the controls on the modal window itself, and clicking anywhere else in the application will just make it beep at you. Because of their disruptive nature, modal windows should be used sparingly, in cases where the application can t really move forward on its own without the user answering a question of some kinds (such as, There are 5 open documents with unsaved changes, are you sure you want to quit ). In cases where the information the app needs from the user is related to just a single window or document, you may be better off using a sheet, described later in this chapter, which locks down a single window instead of the entire application.
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The NSAlert Functions
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The simplest modal windows available in Cocoa are the alert panels, which are created and run with a single function call. The function returns when the user clicks one of the buttons, and you can then check the return value to determine which of the buttons they clicked. Depending on how you call the function, there may be one, two, or three buttons presented for the user. The most commonly used modal alert function is NSRunAlertPanel. It has a few variants called NSRunCriticalAlertPanel and NSRunInformationalAlertPanel, which are used for specific purposes specified in Apple s user interface guidelines, but you can safely stick with NSRunAlertPanel. Each of these functions takes five or more parameters. First the title that appears at the top of the panel, then the full text to display, which presents some information or asks the user a question, then three strings (which may be nil)
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CHAPTER 10: Windows and Menus and Sheets
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containing the button titles. Button titles left as nil will simply be undisplayed, except for the case where they re all nil, in which case a single OK button is included on the panel. To see some alert panels in action, implement the following method in WindowLabAppDelegate.m. Be sure to put a matching declaration in the .h file as well:
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- (IBAction)runModalAlerts:(id)sender { NSRunCriticalAlertPanel(@"Basic Usage", @"This is a plain alert panel.", nil, nil, nil); NSRunAlertPanel(@"Three Buttons", @"We can set button titles:", @"Really ", @"Oh, how delightful!", @"Whatever."); NSRunAlertPanel(@"Formatting Strings", @"We can also do some formatting, %@ %@", nil, nil, nil, @"putting values for insertion at the end,", @"after the three button values."); switch (NSRunAlertPanel(@"Noticing The Selection", @"And of course, we can detect which button is clicked.", @"Default", @"Alternate", @"Other")) { case NSAlertDefaultReturn: NSRunInformationalAlertPanel(@"Result:", @"You pressed the default button", nil, nil, nil); break; case NSAlertAlternateReturn: NSRunInformationalAlertPanel(@"Result:", @"You pressed the alternate button", nil, nil, nil); break; case NSAlertOtherReturn: NSRunInformationalAlertPanel(@"Result:", @"You pressed the other button", nil, nil, nil); break; default: break; } }
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Test these out by going into MainMenu.xib, adding yet another button to your window (title it Run Modal Alerts), and connecting it to the app delegate s runModalAlerts: action. Save, back to Xcode, Build & Run, and give it a whirl.
Open Panels and Save Panels
The other most commonly used modal panels in Cocoa are probably the ones for opening and saving files, NSOpenPanel and NSSavePanel. Using these panels is typically more than just a one-liner. You might first need to configure various options on the panel (for instance, whether it should allow the user to select multiple files for opening, or just one), then run the panel, check the return value (which indicates whether the user eventually clicked the open or save button, or canceled out), and then grab the resulting filenames from the panel. Note that these panels don t actually do any file I/O, they just prompt the user for filenames and give you back the results.
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