#import "AboutBox.h"
@implementation AboutBox
static AboutBox *sharedInstance = nil;
+ (AboutBox *)sharedInstance
{
return sharedInstance ? sharedInstance : [[self alloc] init];
}
- (id)init
{
if (sharedInstance) {
[self dealloc];
} else {
sharedInstance = [super init];
}
return sharedInstance;
}
- (IBAction)showPanel:(id)sender
{
if (!creditsField) {
NSString *creditsPath;
NSAttributedString *creditsString;
float fieldHeight;
float containerHeight;
if (![NSBundle loadNibNamed:@"AboutBox" owner:self]) {
NSLog( @"Failed to load AboutBox.nib" );
NSBeep();
return;
}
[window setTitle:@"About Navigator"];
creditsPath = [[NSBundle mainBundle] pathForResource:@"Credits" ofType:@"rtf"];
creditsString = [[NSAttributedString alloc] initWithPath:creditsPath documentAttributes:nil];
[creditsField replaceCharactersInRange:NSMakeRange( 0, 0 )
withRTF:[creditsString RTFFromRange:
NSMakeRange( 0, [creditsString length] )
documentAttributes:nil]];
fieldHeight = [creditsField frame].size.height;
(void)[[creditsField layoutManager] glyphRangeForTextContainer:[creditsField textContainer]];
containerHeight = [[creditsField layoutManager] usedRectForTextContainer:
[creditsField textContainer]].size.height;
maxScrollHeight = containerHeight - fieldHeight;
[window setExcludedFromWindowsMenu:YES];
[window setMenu:nil];
[window center];
}
if (![window isVisible]) {
currentPosition = 0;
restartAtTop = NO;
startTime = [NSDate timeIntervalSinceReferenceDate] + 3.0;
[creditsField scrollPoint:NSMakePoint( 0, 0 )];
}
[window makeKeyAndOrderFront:nil];
}
- (void)windowDidBecomeKey:(NSNotification *)notification
{
scrollTimer = [NSTimer scheduledTimerWithTimeInterval:1/4
target:self
selector:@selector(scrollCredits:)
userInfo:nil
repeats:YES];
}
- (void)windowDidResignKey:(NSNotification *)notification
{
[scrollTimer invalidate];
}
- (void)scrollCredits:(NSTimer *)timer
{
if ([NSDate timeIntervalSinceReferenceDate] >= startTime) {
if (restartAtTop) {
startTime = [NSDate timeIntervalSinceReferenceDate] + 3.0;
restartAtTop = NO;
[creditsField scrollPoint:NSMakePoint( 0, 0 )];
return;
}
if (currentPosition >= maxScrollHeight) {
startTime = [NSDate timeIntervalSinceReferenceDate] + 3.0;
currentPosition = 0;
restartAtTop = YES;
} else {
[creditsField scrollPoint:NSMakePoint( 0, currentPosition )];
currentPosition += 0.01;
}
}
}
@end
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