react-native/React/Views/SafeAreaView/RCTSafeAreaView.m at chore/update-cli · devagul93/react-native · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import "RCTSafeAreaView.h"

#import <React/RCTBridge.h>
#import <React/RCTUIManager.h>

#import "RCTSafeAreaViewLocalData.h"

@implementation RCTSafeAreaView {
  __weak RCTBridge *_bridge;
  UIEdgeInsets _currentSafeAreaInsets;
}

- (instancetype)initWithBridge:(RCTBridge *)bridge
{
  if (self = [super initWithFrame:CGRectZero]) {
    _bridge = bridge;
    _emulateUnlessSupported = YES; // The default.
  }

  return self;
}

RCT_NOT_IMPLEMENTED(-(instancetype)initWithCoder : (NSCoder *)decoder)
RCT_NOT_IMPLEMENTED(-(instancetype)initWithFrame : (CGRect)frame)

- (NSString *)description
{
  NSString *superDescription = [super description];

  // Cutting the last `>` character.
  if (superDescription.length > 0 && [superDescription characterAtIndex:superDescription.length - 1] == '>') {
    superDescription = [superDescription substringToIndex:superDescription.length - 1];
  }

  return [NSString stringWithFormat:@"%@; safeAreaInsets = %@; appliedSafeAreaInsets = %@>",
                                    superDescription,
                                    NSStringFromUIEdgeInsets([self safeAreaInsetsIfSupportedAndEnabled]),
                                    NSStringFromUIEdgeInsets(_currentSafeAreaInsets)];
}

- (BOOL)isSupportedByOS
{
  return [self respondsToSelector:@selector(safeAreaInsets)];
}

- (UIEdgeInsets)safeAreaInsetsIfSupportedAndEnabled
{
#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000 /* __IPHONE_11_0 */
  if (self.isSupportedByOS) {
    if (@available(iOS 11.0, *)) {
      return self.safeAreaInsets;
    }
  }
#endif
  return self.emulateUnlessSupported ? self.emulatedSafeAreaInsets : UIEdgeInsetsZero;
}

- (UIEdgeInsets)emulatedSafeAreaInsets
{
  UIViewController *vc = self.reactViewController;

  if (!vc) {
    return UIEdgeInsetsZero;
  }

  CGFloat topLayoutOffset = vc.topLayoutGuide.length;
  CGFloat bottomLayoutOffset = vc.bottomLayoutGuide.length;
  CGRect safeArea = vc.view.bounds;
  safeArea.origin.y += topLayoutOffset;
  safeArea.size.height -= topLayoutOffset + bottomLayoutOffset;
  CGRect localSafeArea = [vc.view convertRect:safeArea toView:self];
  UIEdgeInsets safeAreaInsets = UIEdgeInsetsMake(0, 0, 0, 0);
  if (CGRectGetMinY(localSafeArea) > CGRectGetMinY(self.bounds)) {
    safeAreaInsets.top = CGRectGetMinY(localSafeArea) - CGRectGetMinY(self.bounds);
  }
  if (CGRectGetMaxY(localSafeArea) < CGRectGetMaxY(self.bounds)) {
    safeAreaInsets.bottom = CGRectGetMaxY(self.bounds) - CGRectGetMaxY(localSafeArea);
  }

  return safeAreaInsets;
}

static BOOL UIEdgeInsetsEqualToEdgeInsetsWithThreshold(UIEdgeInsets insets1, UIEdgeInsets insets2, CGFloat threshold)
{
  return ABS(insets1.left - insets2.left) <= threshold && ABS(insets1.right - insets2.right) <= threshold &&
      ABS(insets1.top - insets2.top) <= threshold && ABS(insets1.bottom - insets2.bottom) <= threshold;
}

- (void)safeAreaInsetsDidChange
{
  [self invalidateSafeAreaInsets];
}

- (void)invalidateSafeAreaInsets
{
  [self setSafeAreaInsets:self.safeAreaInsetsIfSupportedAndEnabled];
}

- (void)layoutSubviews
{
  [super layoutSubviews];

  if (!self.isSupportedByOS && self.emulateUnlessSupported) {
    [self invalidateSafeAreaInsets];
  }
}

- (void)setSafeAreaInsets:(UIEdgeInsets)safeAreaInsets
{
  if (UIEdgeInsetsEqualToEdgeInsetsWithThreshold(safeAreaInsets, _currentSafeAreaInsets, 1.0 / RCTScreenScale())) {
    return;
  }

  _currentSafeAreaInsets = safeAreaInsets;

  RCTSafeAreaViewLocalData *localData = [[RCTSafeAreaViewLocalData alloc] initWithInsets:safeAreaInsets];
  [_bridge.uiManager setLocalData:localData forView:self];
}

- (void)setEmulateUnlessSupported:(BOOL)emulateUnlessSupported
{
  if (_emulateUnlessSupported == emulateUnlessSupported) {
    return;
  }

  _emulateUnlessSupported = emulateUnlessSupported;

  if ([self isSupportedByOS]) {
    return;
  }

  [self invalidateSafeAreaInsets];
}

@end