/*

     File: ExternalDisplayViewController.m

 Abstract: Basics of how to show content on an external display.

  Version: 1.1

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 */

#import "ExternalDisplayViewController.h"

#import <unistd.h>

@interface ExternalDisplayViewController()

@property (nonatomic, strong) IBOutlet UITextView *consoleLog;

@property (nonatomic, strong) IBOutlet UIBarButtonItem *presoModeBarButton;

@property (nonatomic, strong) IBOutlet UIViewController *presoModeViewController;

@property (nonatomic, strong) UIPopoverController *presoModePopoverController;

@property (nonatomic, strong) IBOutlet UIImageView *mainView;

@property (nonatomic, strong) IBOutlet UIImageView *extView;

@property (nonatomic, strong) UIWindow *extWindow;

@property (nonatomic, strong) IBOutlet UIView *placeHolderView;

- (IBAction)barButtonAction:(id)sender;

@end

@implementation ExternalDisplayViewController

/*

 Support for External Displays and Projectors

 iPad, iPhone 4 and later, and iPod touch (4th generation) and later can now be connected to an external display

 through a supported cable. Applications can use this connection to present content in addition to the content

 on the device’s main screen. Depending on the cable, you can output content at up to a 720p (1280 x 720)

 resolution. A resolution of 1024 by 768 resolution may also be available if you prefer to use that aspect ratio.

 To display content on an external display, do the following:

 1. Use the screens class method of the UIScreen class to determine if an external display is available.

 2. If an external screen is available, get the screen object and look at the values in its availableModes

 property. This property contains the configurations supported by the screen.

 3. Select the UIScreenMode object corresponding to the desired resolution and assign it to the currentMode

 property of the screen object.

 4. Create a new window object (UIWindow) to display your content.

 5. Assign the screen object to the screen property of your new window.

 6. Configure the window (by adding views or setting up your OpenGL ES rendering context).

 7. Show the window.

 Important: You should always assign a screen object to your window before you show that window. Although you 

 can change the screen while a window is already visible, doing so is an expensive operation and not recommended.

 Screen mode objects identify a specific resolution supported by the screen. Many screens support multiple

 resolutions, some of which may include different pixel aspect ratios. The decision for which screen mode to use

 should be based on performance and which resolution best meets the needs of your user interface. When you are

 ready to start drawing, use the bounds provided by the UIScreen object to get the proper size for rendering

 your content. The screen’s bounds take into account any aspect ratio data so that you can focus on drawing your content.

 If you want to detect when screens are connected and disconnected, you can register to receive screen

 connection and disconnection notifications. For more information about screens and screen notifications, see

 UIScreen Class Reference. For information about screen modes, see UIScreenMode Class Reference.

*/

- (void) logMessage:(NSString *)message

{

    self.consoleLog.text = [self.consoleLog.text stringByAppendingString:message];

    [self.consoleLog scrollRangeToVisible:NSMakeRange([self.consoleLog.text length], 0)];

}

- (void) logError:(NSError *)error

{

    NSString *message = [NSString stringWithFormat:@"Error: %@ %@\n",

                          [error localizedDescription],

                          [error localizedFailureReason]];

    [self logMessage:message];

}

- (IBAction)barButtonAction:(id)sender

{

    if (self.presoModePopoverController == nil)

    {

        Class cls = NSClassFromString(@"UIPopoverController");

        if (cls != nil) {

            UIPopoverController *aPopoverController =

            [[cls alloc] initWithContentViewController:self.presoModeViewController];

            aPopoverController.delegate = self;

            self.presoModePopoverController = aPopoverController;

            [self.presoModePopoverController presentPopoverFromBarButtonItem:self.presoModeBarButton

                                      permittedArrowDirections:UIPopoverArrowDirectionUp

                                                      animated:YES];

        }

    }   

}

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController

{

    self.presoModePopoverController = nil;

}

- (void)externalWindow:(UIWindow*)window

{

    [self logMessage:[NSString stringWithFormat:@"External window %@\n",

                                  window]];

    self.extWindow = window;

}

- (void)presoMode:(BOOL)isOn

{

    [self logMessage:[NSString stringWithFormat:@"Preso mode %@\n",

                      isOn ? @"on": @"off"]];

    self.extWindow.hidden = YES;

    if (isOn == YES)

    {

        // Show the main view ("1") in the external window

        [self.extView removeFromSuperview];

        [self.extWindow addSubview:self.mainView];

    }

    else {

        // Show the external view ("2") in the external window

        [self.mainView removeFromSuperview];

        [self.extWindow addSubview:self.extView];

    }

    self.extWindow.hidden = NO;

}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.

- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

        self.presoModeViewController.contentSizeForViewInPopover = CGSizeMake(320, 252);

    }

    else {

        CGRect newFrame = CGRectMake(0, 0, self.placeHolderView.frame.size.width, self.placeHolderView.frame.size.height);

        self.presoModeViewController.view.frame = newFrame;

        [self.placeHolderView addSubview:self.presoModeViewController.view];

        [self addChildViewController:self.presoModeViewController];

        [self.presoModeViewController didMoveToParentViewController:self];

    }

}

@end