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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator.h" | 5 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator.h" |
6 | 6 |
7 #import "base/logging.h" | 7 #import "base/logging.h" |
8 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.
h" | 8 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.
h" |
9 | 9 |
10 #if !defined(__has_feature) || !__has_feature(objc_arc) | 10 #if !defined(__has_feature) || !__has_feature(objc_arc) |
11 #error "This file requires ARC support." | 11 #error "This file requires ARC support." |
12 #endif | 12 #endif |
13 | 13 |
14 @interface BrowserCoordinator () | 14 @interface BrowserCoordinator () |
15 // Child coordinators owned by this object. | 15 // Child coordinators owned by this object. |
16 @property(nonatomic, strong) | 16 @property(nonatomic, strong) |
17 NSMutableSet<BrowserCoordinator*>* childCoordinators; | 17 NSMutableSet<BrowserCoordinator*>* childCoordinators; |
18 // Parent coordinator of this object, if any. | 18 // Parent coordinator of this object, if any. |
19 @property(nonatomic, readwrite, weak) BrowserCoordinator* parentCoordinator; | 19 @property(nonatomic, readwrite, weak) BrowserCoordinator* parentCoordinator; |
20 @property(nonatomic, readwrite) BOOL started; | 20 @property(nonatomic, readwrite) BOOL started; |
21 @property(nonatomic, readwrite) BOOL overlaying; | |
22 @end | 21 @end |
23 | 22 |
24 @implementation BrowserCoordinator | 23 @implementation BrowserCoordinator |
25 | 24 |
26 @synthesize browser = _browser; | 25 @synthesize browser = _browser; |
27 @synthesize childCoordinators = _childCoordinators; | 26 @synthesize childCoordinators = _childCoordinators; |
28 @synthesize parentCoordinator = _parentCoordinator; | 27 @synthesize parentCoordinator = _parentCoordinator; |
29 @synthesize started = _started; | 28 @synthesize started = _started; |
30 @synthesize overlaying = _overlaying; | |
31 | 29 |
32 - (instancetype)init { | 30 - (instancetype)init { |
33 if (self = [super init]) { | 31 if (self = [super init]) { |
34 _childCoordinators = [NSMutableSet set]; | 32 _childCoordinators = [NSMutableSet set]; |
35 } | 33 } |
36 return self; | 34 return self; |
37 } | 35 } |
38 | 36 |
39 #pragma mark - Public API | 37 #pragma mark - Public API |
40 | 38 |
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76 - (void)addChildCoordinator:(BrowserCoordinator*)childCoordinator { | 74 - (void)addChildCoordinator:(BrowserCoordinator*)childCoordinator { |
77 CHECK([self respondsToSelector:@selector(viewController)]) | 75 CHECK([self respondsToSelector:@selector(viewController)]) |
78 << "BrowserCoordinator implementations must provide a viewController " | 76 << "BrowserCoordinator implementations must provide a viewController " |
79 "property."; | 77 "property."; |
80 [self.childCoordinators addObject:childCoordinator]; | 78 [self.childCoordinators addObject:childCoordinator]; |
81 childCoordinator.parentCoordinator = self; | 79 childCoordinator.parentCoordinator = self; |
82 childCoordinator.browser = self.browser; | 80 childCoordinator.browser = self.browser; |
83 [childCoordinator wasAddedToParentCoordinator:self]; | 81 [childCoordinator wasAddedToParentCoordinator:self]; |
84 } | 82 } |
85 | 83 |
86 - (BrowserCoordinator*)overlayCoordinator { | |
87 if (self.overlaying) | |
88 return self; | |
89 for (BrowserCoordinator* child in self.children) { | |
90 BrowserCoordinator* overlay = child.overlayCoordinator; | |
91 if (overlay) | |
92 return overlay; | |
93 } | |
94 return nil; | |
95 } | |
96 | |
97 - (void)addOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator { | |
98 // If this object has no children, then add |overlayCoordinator| as a child | |
99 // and mark it as such. | |
100 if ([self canAddOverlayCoordinator:overlayCoordinator]) { | |
101 [self addChildCoordinator:overlayCoordinator]; | |
102 overlayCoordinator.overlaying = YES; | |
103 } else if (self.childCoordinators.count == 1) { | |
104 [[self.childCoordinators anyObject] | |
105 addOverlayCoordinator:overlayCoordinator]; | |
106 } else if (self.childCoordinators.count > 1) { | |
107 CHECK(NO) << "Coordinators with multiple children must explicitly " | |
108 << "handle -addOverlayCoordinator: or return NO to " | |
109 << "-canAddOverlayCoordinator:"; | |
110 } | |
111 // If control reaches here, the terminal child of the coordinator hierarchy | |
112 // has returned NO to -canAddOverlayCoordinator, so no overlay can be added. | |
113 // This is by default a silent no-op. | |
114 } | |
115 | |
116 - (void)removeOverlayCoordinator { | |
117 BrowserCoordinator* overlay = self.overlayCoordinator; | |
118 [overlay.parentCoordinator removeChildCoordinator:overlay]; | |
119 overlay.overlaying = NO; | |
120 } | |
121 | |
122 - (BOOL)canAddOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator { | |
123 // By default, a hierarchy with an overlay can't add a new one. | |
124 // By default, coordinators with parents can't be added as overlays. | |
125 // By default, coordinators with no other children can add an overlay. | |
126 return self.overlayCoordinator == nil && | |
127 overlayCoordinator.parentCoordinator == nil && | |
128 self.childCoordinators.count == 0; | |
129 } | |
130 | |
131 - (void)removeChildCoordinator:(BrowserCoordinator*)childCoordinator { | 84 - (void)removeChildCoordinator:(BrowserCoordinator*)childCoordinator { |
132 if (![self.childCoordinators containsObject:childCoordinator]) | 85 if (![self.childCoordinators containsObject:childCoordinator]) |
133 return; | 86 return; |
134 // Remove the grand-children first. | 87 // Remove the grand-children first. |
135 for (BrowserCoordinator* grandChild in childCoordinator.children) { | 88 for (BrowserCoordinator* grandChild in childCoordinator.children) { |
136 [childCoordinator removeChildCoordinator:grandChild]; | 89 [childCoordinator removeChildCoordinator:grandChild]; |
137 } | 90 } |
138 // Remove the child. | 91 // Remove the child. |
139 [childCoordinator willBeRemovedFromParentCoordinator]; | 92 [childCoordinator willBeRemovedFromParentCoordinator]; |
140 [self.childCoordinators removeObject:childCoordinator]; | 93 [self.childCoordinators removeObject:childCoordinator]; |
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152 | 105 |
153 - (void)childCoordinatorDidStart:(BrowserCoordinator*)childCoordinator { | 106 - (void)childCoordinatorDidStart:(BrowserCoordinator*)childCoordinator { |
154 // Default implementation is a no-op. | 107 // Default implementation is a no-op. |
155 } | 108 } |
156 | 109 |
157 - (void)childCoordinatorWillStop:(BrowserCoordinator*)childCoordinator { | 110 - (void)childCoordinatorWillStop:(BrowserCoordinator*)childCoordinator { |
158 // Default implementation is a no-op. | 111 // Default implementation is a no-op. |
159 } | 112 } |
160 | 113 |
161 @end | 114 @end |
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