/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  AAPLOverlayAnimatedTransitioning and AAPLOverlayTransitioningDelegate implementations.

 */

#import "AAPLOverlayTransitioner.h"

#import "AAPLOverlayPresentationController.h"

#import "AAPLCoolPresentationController.h"

#import "AAPLRootViewController.h"

@implementation AAPLOverlayTransitioningDelegate

- (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(UIViewController *)presenting sourceViewController:(UIViewController *)source

{

    // Here, we'll provide the presentation controller to be used for the presentation

    Class presentationControllerClass;

    // If our presentation should be awesome, return the AAPLCoolPresentationController. We determine this based on -[AAPLRootViewController presentationShouldBeAwesome]

    if([source isKindOfClass:[AAPLRootViewController class]] && [(AAPLRootViewController *)source presentationShouldBeAwesome])

    {

        presentationControllerClass = [AAPLCoolPresentationController class];

    }

    else

    {

        presentationControllerClass = [AAPLOverlayPresentationController class];

    }

    return [[presentationControllerClass alloc] initWithPresentedViewController:presented presentingViewController:presenting];

}

- (AAPLOverlayAnimatedTransitioning *)animationController

{

    AAPLOverlayAnimatedTransitioning *animationController = [[AAPLOverlayAnimatedTransitioning alloc] init];

    return animationController;

}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source

{

    AAPLOverlayAnimatedTransitioning *animationController = [self animationController];

    [animationController setIsPresentation:YES];

    return animationController;

}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed

{

    AAPLOverlayAnimatedTransitioning *animationController = [self animationController];

    [animationController setIsPresentation:NO];

    return animationController;

}

@end

@implementation AAPLOverlayAnimatedTransitioning

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext

{

    return 0.5;

}

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext

{

    // Here, we perform the animations necessary for the transition

    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];

    UIView *fromView = [fromVC view];

    UIViewController *toVC   = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    UIView *toView = [toVC view];

    UIView *containerView = [transitionContext containerView];

    BOOL isPresentation = [self isPresentation];

    if(isPresentation)

    {

        [containerView addSubview:toView];

    }

    UIViewController *animatingVC = isPresentation? toVC : fromVC;

    UIView *animatingView = [animatingVC view];

    CGRect appearedFrame = [transitionContext finalFrameForViewController:animatingVC];

    // Our dismissed frame is the same as our appeared frame, but off the right edge of the container

    CGRect dismissedFrame = appearedFrame;

    dismissedFrame.origin.x += dismissedFrame.size.width;

    CGRect initialFrame = isPresentation ? dismissedFrame : appearedFrame;

    CGRect finalFrame = isPresentation ? appearedFrame : dismissedFrame;

    [animatingView setFrame:initialFrame];

    // Animate using the duration from -transitionDuration:

    [UIView animateWithDuration:[self transitionDuration:transitionContext]

                          delay:0

         usingSpringWithDamping:300.0

          initialSpringVelocity:5.0

                        options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState

                     animations:^{

                         [animatingView setFrame:finalFrame];

                    }

                     completion:^(BOOL finished){

                                    // If we're dismissing, remove the presented view from the hierarchy

                         if(![self isPresentation])

                         {

                             [fromView removeFromSuperview];

                         }

                         // We need to notify the view controller system that the transition has finished

                        [transitionContext completeTransition:YES];

                    }];

}

@end