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

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CHAPTER 10: Windows and Menus and Sheets
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To see an example of how this can work, consider the following method, which pretends to copy a file. This method uses an NSOpenPanel to prompt the user for the file to copy, then uses an NSSavePanel to let the user specify where the file should go:
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- (IBAction)copyFile:(id)sender { NSOpenPanel *openPanel = [NSOpenPanel openPanel]; [openPanel setTitle:@"Select file to copy:"]; if ([openPanel runModalForTypes:nil] == NSOKButton) { // get the first (and only) selected filename NSString *openPath = [[openPanel filenames] objectAtIndex:0]; // pull out just the filename, without directory path NSString *openFilename = [openPath lastPathComponent]; NSSavePanel *savePanel = [NSSavePanel savePanel]; [savePanel setTitle:@"Enter destination filename:"]; // run the save panel in its default directory, with the opened filename // as a suggestion. if ([savePanel runModalForDirectory:nil file:openFilename] == NSOKButton) { NSString *savePath = [savePanel filename]; NSString *message = [NSString stringWithFormat: @"You've opened this file:\n\n%@\n\nand saved it here:\n\n%@\n\n", openPath, savePath]; NSRunAlertPanel(@"Copying file (not really)", message, nil, nil, nil); } } }
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Put that method into WindowLabAppDelegate.m, and create the matching declaration in the .h file. Then go back to MainMenu.xib in Interface Builder, and once again add a new button (call this one Copy File ) and connect it to the new copyFile: action. Save your changes, go back to Xcode, Build & Run, and try out the new button. You ll see a standard Open panel appear, followed by a standard Save panel. Note that the Save panel even has built-in functionality to warn you when you re selecting an existing file, asking you if you really want to overwrite it (remember, it s perfectly safe to confirm overwriting the file in this example, since we re not actually copying anything). It s probably worth mentioning here the not-so-obvious fact that NSOpenPanel is actually a subclass of NSSavePanel. That means that if you can t seem to find the functionality you re expecting in NSOpenPanel s documentation or header file, you may need to check out NSSavePanel as well.
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Now that you ve seen some of the basics of how windows are used in Cocoa, let s spend some time dealing with another ever-present feature of Mac OS X, the application menu. Unlike most other current operating systems, Mac OS X presents its menu at the top of the screen instead of at the top of each window. This arrangement has some nice upsides: screen real estate is saved, because instead of a horizontal strip taking space at the top of every open window, you have just a single horizontal strip at the top, showing the menu for the active application. Also, the menu is easier and quicker to hit with the mouse, because you can just flick the mouse upwards and you know you ll
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CHAPTER 10: Windows and Menus and Sheets
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hit the menu, leaving you with just fine-tuning left and right to find the top item you want to select. This arrangement isn t without complications, however. In a typical Windows application, you might have a number of different windows, each with its own menu, containing items that are only relevant to that window s contents. While it s technically possible to do something similar in a Mac OS X application, changing the structure of the menu as different windows are selected, this usage is frowned upon, and will probably bother some users, who on the Mac are quite accustomed to applications that behave in a consistent manner. Instead, you can implement a behavior that is fully supported and recommended: Enabling and disabling menu items based on the currently selected window (or, indeed, the currently selected object inside a window). In this section, we re going to show you how to do this, but first we re going to talk a bit about the system menus that are included with Cocoa and standard across most applications.
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