ios/chrome/browser/ui/util/optional_property_animator.mm

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#import "ios/chrome/browser/ui/util/optional_property_animator.h"

#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif

@interface OptionalPropertyAnimator ()

// Redefine property as readwrite.
@property(nonatomic, readwrite) BOOL hasAnimations;

@end

@implementation OptionalPropertyAnimator
@synthesize hasAnimations = _hasAnimations;

#pragma mark - UIViewPropertyAnimator

- (instancetype)initWithDuration:(NSTimeInterval)duration
                           curve:(UIViewAnimationCurve)curve
                      animations:(void (^__nullable)(void))animations {
  if (self =
          [super initWithDuration:duration curve:curve animations:animations]) {
    _hasAnimations = !!animations;
  }
  return self;
}

- (instancetype)initWithDuration:(NSTimeInterval)duration
                   controlPoint1:(CGPoint)point1
                   controlPoint2:(CGPoint)point2
                      animations:(void (^__nullable)(void))animations {
  if (self = [super initWithDuration:duration
                       controlPoint1:point1
                       controlPoint2:point2
                          animations:animations]) {
    _hasAnimations = !!animations;
  }
  return self;
}

- (instancetype)initWithDuration:(NSTimeInterval)duration
                    dampingRatio:(CGFloat)ratio
                      animations:(void (^__nullable)(void))animations {
  if (self = [super initWithDuration:duration
                        dampingRatio:ratio
                          animations:animations]) {
    _hasAnimations = !!animations;
  }
  return self;
}

#pragma mark - UIViewImplicitlyAnimating

- (void)addAnimations:(void (^)(void))animation
          delayFactor:(CGFloat)delayFactor {
  if (animation)
    self.hasAnimations = YES;
  [super addAnimations:animation delayFactor:delayFactor];
}

- (void)addAnimations:(void (^)(void))animation {
  if (animation)
    self.hasAnimations = YES;
  [super addAnimations:animation];
}

#pragma mark - UIViewAnimating

- (void)startAnimation {
  if (!self.hasAnimations)
    return;
  [super startAnimation];
}

- (void)startAnimationAfterDelay:(NSTimeInterval)delay {
  if (!self.hasAnimations)
    return;
  [super startAnimationAfterDelay:delay];
}

@end