QuickTime Kit Programming Guide - filibeto.org

C H A P T E R 4
Adding New Capabilities to the QTKitPlayer Application
1. Insert the following line of code in the @interface directive block after your export outlet
declarations. This enables you to specify the movie attributes for your NSDrawer object:
IBOutlet NSDrawer *mDrawer;
2. Add the following code (also in the @interface block) to specify the drawer elements for your
movie attributes:
IBOutlet NSTextField *mCurrentSize;
IBOutlet NSTextField *mDuration;
IBOutlet NSTextField *mNormalSize;
IBOutlet NSTextField *mSourceName;
IBOutlet NSTextField *mTimeDisplay;
3. Define a getter for your drawer with the following line of code:
- (id)drawer;
4. Add to your IBActions to toggle the drawer open and closed, with the following line of code:
- (IBAction)toggleDrawer:(id)sender;
5. Insert the following methods before the @end directive in the file:
- (void)setDurationDisplay;
- (void)setNormalSizeDisplay;
- (void)setCurrentSizeDisplay;
- (void)setSource:(NSString *)name;
- (void)setTimeDisplay;
6. Add these two methods to install and remove the movie callback before the @end directive in the
file:
-(void)removeMovieIdleCallback;
-(void)installMovieIdleCallback;
Adding Code To Make the Drawer Work
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. You’ll add the following blocks of
code to your file. Just follow these steps:
1. After your import and #define statements, add this line of C code to set your timer display. You
pass your movie document in the refcon parameter and that gives you a way to call the
setTimeDisplay: method. This is the function prototype you add:
pascal Boolean MyActionFilter (MovieController mc, short action, void* params,
long refCon);
As the movie is being serviced by QuickTime, the movie controller component calls your action
filter procedure each time the component receives an action for its movie controller. You use the
idle action in your filter procedure to update your timer display.
Adding Code To Your QTKitPlayer Project 73
2005-11-09 | © 2004, 2005 Apple Computer, Inc. All Rights Reserved.