/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  AAPLOverlayPresentationController implementation.

 */

#import "AAPLOverlayPresentationController.h"

#import "AAPLOverlayTransitioner.h"

@implementation AAPLOverlayPresentationController

- (instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController;

{

    self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController];

    if(self)

    {

        [self prepareDimmingView];

    }

    return self;

}

- (void)presentationTransitionWillBegin

{

    // Here, we'll set ourselves up for the presentation

    UIView* containerView = [self containerView];

    UIViewController* presentedViewController = [self presentedViewController];

    // Make sure the dimming view is the size of the container's bounds, and fully transparent

    [[self dimmingView] setFrame:[containerView bounds]];

    [[self dimmingView] setAlpha:0.0];

    // Insert the dimming view below everything else

    [containerView insertSubview:[self dimmingView] atIndex:0];

    if([presentedViewController transitionCoordinator])

    {

        [[presentedViewController transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

            // Fade the dimming view to be fully visible

            [[self dimmingView] setAlpha:1.0];

        } completion:nil];

    }

    else

    {

        [[self dimmingView] setAlpha:1.0];

    }

}

- (void)dismissalTransitionWillBegin

{

    // Here, we'll undo what we did in -presentationTransitionWillBegin. Fade the dimming view to be fully transparent

    if([[self presentedViewController] transitionCoordinator])

    {

        [[[self presentedViewController] transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

            [[self dimmingView] setAlpha:0.0];

        } completion:nil];

    }

    else

    {

        [[self dimmingView] setAlpha:0.0];

    }

}

- (UIModalPresentationStyle)adaptivePresentationStyle

{

    // When we adapt to a compact width environment, we want to be over full screen

    return UIModalPresentationOverFullScreen;

}

- (CGSize)sizeForChildContentContainer:(id <UIContentContainer>)container withParentContainerSize:(CGSize)parentSize

{

    // We always want a size that's a third of our parent view width, and just as tall as our parent

    return CGSizeMake(floorf(parentSize.width / 3.0),

                      parentSize.height);

}

- (void)containerViewWillLayoutSubviews

{

    // Before layout, make sure our dimmingView and presentedView have the correct frame

    [[self dimmingView] setFrame:[[self containerView] bounds]];

    [[self presentedView] setFrame:[self frameOfPresentedViewInContainerView]];

}

- (BOOL)shouldPresentInFullscreen

{

    // This is a full screen presentation

    return YES;

}

- (CGRect)frameOfPresentedViewInContainerView

{

    // Return a rect with the same size as -sizeForChildContentContainer:withParentContainerSize:, and right aligned

    CGRect presentedViewFrame = CGRectZero;

    CGRect containerBounds = [[self containerView] bounds];

    presentedViewFrame.size = [self sizeForChildContentContainer:(UIViewController<UIContentContainer> *)[self presentedViewController]

                                         withParentContainerSize:containerBounds.size];

    presentedViewFrame.origin.x = containerBounds.size.width - presentedViewFrame.size.width;

    return presentedViewFrame;

}

- (void)prepareDimmingView

{

    _dimmingView = [[UIView alloc] init];

    [[self dimmingView] setBackgroundColor:[UIColor colorWithWhite:0.0 alpha:0.4]];

    [[self dimmingView] setAlpha:0.0];

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dimmingViewTapped:)];

    [[self dimmingView] addGestureRecognizer:tap];

}

- (void)dimmingViewTapped:(UIGestureRecognizer *)gesture

{

    if([gesture state] == UIGestureRecognizerStateRecognized)

    {

        [[self presentingViewController] dismissViewControllerAnimated:YES completion:NULL];

    }

}

@end