/*
     File: TransitionViewController.m
 Abstract: The view controller for showing transitions with UIView.
  Version: 2.6
 
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 */

#import "TransitionViewController.h"
#import "Constants.h"

#define kImageHeight		200.0
#define kImageWidth			250.0
#define kTransitionDuration	0.75
#define kTopPlacement		80.0	// y coord for the images

#pragma mark -
@implementation TransitionsViewController

@synthesize containerView, mainView, flipToView;

- (void)dealloc
{
	[mainView release];
	[flipToView release];
	[containerView release];
	
	[super dealloc];
}

- (void)viewDidLoad
{
	[super viewDidLoad];
	
	self.title = NSLocalizedString(@"TransitionsTitle", @"");

	// create the container view which we will use for transition animation (centered horizontally)
	CGRect frame = CGRectMake(round((self.view.bounds.size.width - kImageWidth) / 2.0),
														kTopPlacement, kImageWidth, kImageHeight);
	self.containerView = [[[UIView alloc] initWithFrame:frame] autorelease];
	[self.view addSubview:self.containerView];
	
	// The container view can represent the images for accessibility.
	[self.containerView setIsAccessibilityElement:YES];
	[self.containerView setAccessibilityLabel:NSLocalizedString(@"ImagesTitle", @"")];
	
	// create the initial image view
	frame = CGRectMake(0.0, 0.0, kImageWidth, kImageHeight);
	self.mainView = [[[UIImageView alloc] initWithFrame:frame] autorelease];
	self.mainView.image = [UIImage imageNamed:@"scene1.jpg"];
	[self.containerView addSubview:self.mainView];
	
	// create the alternate image view (to transition between)
	CGRect imageFrame = CGRectMake(0.0, 0.0, kImageWidth, kImageHeight);
	self.flipToView = [[[UIImageView alloc] initWithFrame:imageFrame] autorelease];
	self.flipToView.image = [UIImage imageNamed:@"scene2.jpg"];
}

// called after the view controller's view is released and set to nil.
// For example, a memory warning which causes the view to be purged. Not invoked as a result of -dealloc.
// So release any properties that are loaded in viewDidLoad or can be recreated lazily.
//
- (void)viewDidUnload
{
	[super viewDidUnload];
	
	self.containerView = nil;
	self.flipToView = nil;
	self.mainView = nil;
}

- (IBAction)curlAction:(id)sender
{
	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationDuration:kTransitionDuration];
	
	[UIView setAnimationTransition:([self.mainView superview] ?
									UIViewAnimationTransitionCurlUp : UIViewAnimationTransitionCurlDown)
						   forView:self.containerView cache:YES];
	if ([self.flipToView superview])
	{
		[self.flipToView removeFromSuperview];
		[self.containerView addSubview:self.mainView];
	}
	else
	{
		[self.mainView removeFromSuperview];
		[self.containerView addSubview:self.flipToView];
	}
	
	[UIView commitAnimations];
}

- (IBAction)flipAction:(id)sender
{
	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationDuration:kTransitionDuration];
		
	[UIView setAnimationTransition:([self.mainView superview] ?
										UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight)
										forView:self.containerView cache:YES];
	if ([flipToView superview])
	{
		[self.flipToView removeFromSuperview];
		[self.containerView addSubview:mainView];
	}
	else
	{
		[self.mainView removeFromSuperview];
		[self.containerView addSubview:flipToView];
	}
	
	[UIView commitAnimations];
}


#pragma mark -
#pragma mark UIViewController delegate methods

// called after this controller's view was dismissed, covered or otherwise hidden
- (void)viewWillDisappear:(BOOL)animated
{	
	// restore the nav bar and status bar color to default
	self.navigationController.navigationBar.barStyle = UIBarStyleDefault;
	[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;
}

// called after this controller's view will appear
- (void)viewWillAppear:(BOOL)animated
{	
	// for aesthetic reasons (the background is black), make the nav bar black for this particular page
	self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque;
	
	// match the status bar with the nav bar
	[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque;
}

@end