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Cocoa Programming for Mac OS X, Third Edition by Aaron Hillegass

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Chapter 25. Sheets

A sheet is simply an NSWindow instance that is attached to another window. The sheet comes down over the window, and the window stops getting events until the sheet is dismissed. Typically, you will compose a sheet as an offscreen window in your nib file.

NSApplication has several methods that make sheets possible:

// Start a sheet
- (void)beginSheet:(NSWindow *)sheet
    modalForWindow:(NSWindow *)docWindow
     modalDelegate:(id)modalDelegate
    didEndSelector:(SEL)didEndSelector
       contextInfo:(void *)contextInfo;

// End the sheet
- (void)endSheet:(NSWindow *)sheet returnCode:(int)returnCode;

Besides the sheet window and the window to which it is attached, you supply a modal delegate, a selector, and a pointer when you start the sheet. The ...

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