/*

     File: PortraitViewController.m

 Abstract: The application view controller used when the device is in portrait 

 orientation.

  Version: 1.3

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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 */

#import "PortraitViewController.h"

@implementation PortraitViewController

//| ----------------------------------------------------------------------------

- (void)viewDidLoad

{

    // Instruct the system to generate notifications when the device orientation

    // changes.  This view controller will not receive calls to

    // willRotateToInterfaceOrientation:duration: and

    // didRotateFromInterfaceOrientation: because the system will never attempt

    // to rotate this view controller.  Thus, orientation notifications are the

    // only way to know the orientation changed.

    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(onDeviceOrientationDidChange:)

                                                 name:UIDeviceOrientationDidChangeNotification

                                               object:nil];

}

#pragma mark - 

#pragma mark Rotation

//| ----------------------------------------------------------------------------

//! Handler for the UIDeviceOrientationDidChangeNotification.

//

- (void)onDeviceOrientationDidChange:(NSNotification *)notification

{

    // A delay must be added here, otherwise the new view will be swapped in

    // too quickly resulting in an animation glitch

    [self performSelector:@selector(updateLandscapeView) withObject:nil afterDelay:0];

}

//| ----------------------------------------------------------------------------

//  This method contains the logic for presenting and dismissing the

//  LandscapeViewController depending on the current device orientation and

//  whether the LandscapeViewController is currently presented.

//

- (void)updateLandscapeView

{

    // Get the device's current orientation.  By the time the

    // UIDeviceOrientationDidChangeNotification has been posted, this value

    // reflects the new orientation of the device.

    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;

    if (UIDeviceOrientationIsLandscape(deviceOrientation) && self.presentedViewController == nil)

    // Only take action if the orientation is landscape and

    // presentedViewController is nil (no view controller is presented).  The

    // later check prevents this view controller from trying to present

    // landscapeViewController again if the device rotates from landscape to

    // landscape (the user turns the device 180 degrees).

    {

        // Trigger the segue to present LandscapeViewController modally.

        [self performSegueWithIdentifier:@"PresentLandscapeViewControllerSegue" sender:self];

    }

    else if (deviceOrientation == UIDeviceOrientationPortrait && self.presentedViewController != nil)

    // Only take action if the orientation is portrait and

    // presentedViewController is not nil (a view controller is presented).

    {

        [self dismissViewControllerAnimated:YES completion:NULL];

    }

}

//| ----------------------------------------------------------------------------

//  Support only portrait orientation.

//

- (NSUInteger)supportedInterfaceOrientations

{

    return UIInterfaceOrientationMaskPortrait;

}

#pragma mark - 

#pragma mark Cleanup

//| ----------------------------------------------------------------------------

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    // Instruct the system to stop generating device orientation notifications.

    [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];

}

@end