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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #import "ios/clean/chrome/browser/ui/animators/zoom_transition_animator.h" | |
6 | |
7 #include "base/mac/foundation_util.h" | |
8 | |
9 #if !defined(__has_feature) || !__has_feature(objc_arc) | |
10 #error "This file requires ARC support." | |
11 #endif | |
12 | |
13 @implementation ZoomTransitionAnimator | |
14 @synthesize presenting = _presenting; | |
15 @synthesize presentationKey = _presentationKey; | |
16 @synthesize delegate = _delegate; | |
17 | |
18 #pragma mark - Public API | |
19 | |
20 - (void)selectDelegate:(NSArray<id<NSObject>>*)possibleDelegates { | |
21 for (id<NSObject> obj in possibleDelegates) { | |
22 if ([obj conformsToProtocol:@protocol(ZoomTransitionDelegate)]) { | |
23 self.delegate = static_cast<id<ZoomTransitionDelegate>>(obj); | |
24 return; | |
25 } | |
26 } | |
27 self.delegate = nil; | |
28 } | |
29 | |
30 #pragma mark - UIViewControllerAnimatedTransitioning | |
31 | |
32 - (void)animateTransition:(id<UIViewControllerContextTransitioning>)context { | |
33 UIView* presentedView; | |
34 UIView* presentingView; | |
35 UIViewController* presentedViewController; | |
36 UIViewController* presentingViewController; | |
37 | |
38 // Map the keyed view/view controllers in |context| to local vars. | |
39 if (self.presenting) { | |
40 presentedView = [context viewForKey:UITransitionContextToViewKey]; | |
41 presentingView = [context viewForKey:UITransitionContextFromViewKey]; | |
42 presentedViewController = | |
43 [context viewControllerForKey:UITransitionContextToViewControllerKey]; | |
44 presentingViewController = | |
45 [context viewControllerForKey:UITransitionContextFromViewControllerKey]; | |
46 } else { | |
47 presentedView = [context viewForKey:UITransitionContextFromViewKey]; | |
48 presentingView = [context viewForKey:UITransitionContextToViewKey]; | |
49 presentedViewController = | |
50 [context viewControllerForKey:UITransitionContextFromViewControllerKey]; | |
51 presentingViewController = | |
52 [context viewControllerForKey:UITransitionContextToViewControllerKey]; | |
53 } | |
54 | |
55 // Figure out what to use as the "zoom rectangle" -- the rectangle that the | |
56 // presentation or dismissal will move from or to. | |
57 CGRect rect = CGRectNull; | |
58 UIView* zoomRectView = presentingViewController.view; | |
59 if (self.delegate) { | |
60 rect = [self.delegate rectForZoomWithKey:self.presentationKey | |
61 inView:zoomRectView]; | |
62 } | |
63 | |
64 // If no usable rectangle was provided, use a rectangle that's 1/5 of the | |
65 // presenting view's smaller dimension square, positioned in its center. | |
66 if (CGRectIsNull(rect)) { | |
67 CGRect presenterRect = zoomRectView.bounds; | |
68 CGFloat side = std::min(CGRectGetHeight(presenterRect), | |
69 CGRectGetWidth(presenterRect)) / | |
70 5.0; | |
71 | |
72 rect = CGRectMake(CGRectGetMidX(presenterRect) - (side / 2.0), | |
73 CGRectGetMidY(presenterRect) - (side / 2.0), side, side); | |
74 } | |
75 | |
76 // Convert that rect into the coordinate space of the container view. | |
77 CGRect zoomRect = | |
78 [context.containerView convertRect:rect fromView:zoomRectView]; | |
79 | |
80 // Set up initial and final values for the animation. | |
81 CGFloat finalAlpha; | |
82 CGRect finalRect; | |
83 if (self.presenting) { | |
84 // In this case, the view being presented isn't yet in a view hierarchy, so | |
85 // it should be added in its initial position (|zoomRect|) and opacity. | |
86 presentedView.frame = zoomRect; | |
87 [context.containerView addSubview:presentedView]; | |
88 presentedView.alpha = 0.0; | |
89 // The presented view will finish the animation at the frame vended by | |
90 // |context|, at full opacity. | |
91 finalAlpha = 1.0; | |
92 finalRect = [context finalFrameForViewController:presentedViewController]; | |
93 } else { | |
94 // When dismissing, the presented view is already covering the window; | |
95 // the presenting view needs to be added underneath it (at the frame vended | |
96 // by |context|. | |
97 presentingView.frame = | |
98 [context finalFrameForViewController:presentingViewController]; | |
99 [context.containerView insertSubview:presentingView | |
100 belowSubview:presentedView]; | |
101 // The presented view will end up faded out, located at |zoomRect|. | |
102 finalAlpha = 0.0; | |
103 finalRect = zoomRect; | |
104 } | |
105 | |
106 [UIView animateWithDuration:[self transitionDuration:context] | |
107 animations:^{ | |
108 presentedView.frame = finalRect; | |
109 presentedView.alpha = finalAlpha; | |
110 [presentedView layoutIfNeeded]; | |
111 } | |
112 completion:^(BOOL finished) { | |
113 if (finished && !self.presenting) { | |
114 [presentedView removeFromSuperview]; | |
115 } | |
116 [context completeTransition:finished]; | |
117 }]; | |
118 } | |
119 | |
120 - (NSTimeInterval)transitionDuration: | |
121 (id<UIViewControllerContextTransitioning>)context { | |
122 return 0.35; | |
123 } | |
124 | |
125 @end | |
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