QuickTime Kit Programming Guide - filibeto.org

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C H A P T E R 3 Extending the QT<strong>Kit</strong>Player Application - (BOOL)createMovieDocumentWithFile:(NSString *)fileName asData:(BOOL)asData; @end 10. To save your NSSavePanel delegate, which handles your export dialog, insert these lines: - (void)exportPanelDidEnd:(NSSavePanel *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo; 11. Save your MovieDocument.h file (Command-S). This completes the first part of code additions to your Xcode project. Adding Code to MovieDocument.m In this next sequence of steps, you’ll be adding a larger chunk of code to your MovieDocument.m implementation file. To begin, open the MovieDocument.m file in your Xcode project and delete any existing code in the file. Now follow these steps: 1. Insert the following import code at the beginning of your file: #import "MovieDocument.h" #import 2. Following your import statements, you want to define a constant for movies that are not necessarily visual––that is, audio files. Specify the width as 320. Insert these lines: #define kDefaultWidthForNonvisualMovies 320 @implementation MovieDocument 3. Now you want to add the following class method and deal with memory allocation. Note that this is just a convenience method if you want to create a document given a movie. By calling autorelease, you auto release the movie. Add these lines: + (id)movieDocumentWithMovie:(QTMovie *)movie { return [[(MovieDocument *)[self alloc] initWithMovie:movie] autorelease]; } 4. Next, you need to add initialization code to initialize a MovieDocument instance and set the file type. Setting the movie to nil will release it. Add these lines: - (id)initWithMovie:(QTMovie *)movie { [super init]; // init [self setFileType:@"MovieDocument"]; [self setMovie:movie]; if (mMovie == nil) { [self release]; 48 Adding Code to MovieDocument.m 2005-11-09 | © 2004, 2005 Apple Computer, Inc. All Rights Reserved.
C H A P T E R 3 Extending the QT<strong>Kit</strong>Player Application } self = nil; } return self; 5. Insert the following code to handle deallocation of memory and notifications: - (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; [self setMovie:nil]; [super dealloc]; } 6. To deal with NSMenu validations for enabling and disabling of menu items, insert this chunk of code: - (BOOL)validateMenuItem:(NSMenuItem *)menuItem { BOOL valid = NO; SEL action; // init action = [menuItem action]; // validate if (action == @selector(doExport:)) valid = (mMovie != nil); else if (action == @selector(doSetFillColorPanel:)) valid = YES; else if (action == @selector(doShowController:)) { [menuItem setState:([mMovieView isControllerVisible] ? NSOnState : NSOffState)]; valid = YES; } else if (action == @selector(doPreserveAspectRatio:)) { [menuItem setState:([mMovieView preservesAspectRatio] ? NSOnState : NSOffState)]; valid = (mMovie != nil); } else if ((action == @selector(doLoop:)) && mMovie) { [menuItem setState:([[mMovie attributeForKey:QTMovieLoopsAttribute] boolValue] ? NSOnState : NSOffState)]; valid = YES; } else if ((action == @selector(doLoopPalindrome:)) && mMovie) { if ([[mMovie attributeForKey:QTMovieLoopsAttribute] boolValue]) { [menuItem setState:([[mMovie attributeForKey:QTMovieLoopsBackAndForthAttribute] boolValue] ? NSOnState : NSOffState)]; valid = YES; } Adding Code to MovieDocument.m 49 2005-11-09 | © 2004, 2005 Apple Computer, Inc. All Rights Reserved.
Page 1 and 2: QuickTime Kit Programming Guide 200
Page 3 and 4: Contents Introduction Introduction
Page 5 and 6: Figures and Tables Chapter 1 The Qu
Page 7 and 8: F I G U R E S A N D T A B L E S Fig
Page 9 and 10: I N T R O D U C T I O N Introductio
Page 11 and 12: C H A P T E R 1 The QuickTime Kit A
Page 17 and 18: C H A P T E R 2 Building a Simple Q
Page 29 and 30: C H A P T E R 3 Extending the QTKit
Page 47: C H A P T E R 3 Extending the QTKit
Page 61 and 62: C H A P T E R 4 Adding New Capabili
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C H A P T E R 6 Adding Multimedia P
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