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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 // ====== New Architecture ===== | |
6 // = This code is only used in the new iOS Chrome architecture. = | |
7 // ============================================================================ | |
8 | |
9 #import "base/logging.h" | |
10 #import "ios/chrome/browser/browser_coordinator+internal.h" | |
11 #import "ios/chrome/browser/browser_coordinator.h" | |
12 | |
13 #if !defined(__has_feature) || !__has_feature(objc_arc) | |
14 #error "This file requires ARC support." | |
15 #endif | |
16 | |
17 @interface BrowserCoordinator () | |
18 // Child coordinators owned by this object. | |
19 @property(nonatomic, strong) | |
20 NSMutableSet<BrowserCoordinator*>* childCoordinators; | |
21 // Parent coordinator of this object, if any. | |
22 @property(nonatomic, readwrite, weak) BrowserCoordinator* parentCoordinator; | |
23 @property(nonatomic, readwrite) BOOL overlaying; | |
24 @end | |
25 | |
26 @implementation BrowserCoordinator | |
27 | |
28 @synthesize browserState = _browserState; | |
29 @synthesize rootViewController = _rootViewController; | |
30 @synthesize childCoordinators = _childCoordinators; | |
31 @synthesize parentCoordinator = _parentCoordinator; | |
32 @synthesize overlaying = _overlaying; | |
33 | |
34 - (instancetype)init { | |
35 if (self = [super init]) { | |
36 _childCoordinators = [NSMutableSet set]; | |
37 } | |
38 return self; | |
39 } | |
40 | |
41 - (void)dealloc { | |
42 [self stop]; | |
43 } | |
44 | |
45 #pragma mark - Public API | |
46 | |
47 - (void)start { | |
48 // Default implementation is a no-op. | |
49 } | |
50 | |
51 - (void)stop { | |
52 // Default implementation is a no-op. | |
53 } | |
54 | |
55 @end | |
56 | |
57 @implementation BrowserCoordinator (Internal) | |
58 // Concrete implementations must implement a |viewController| property. | |
59 @dynamic viewController; | |
60 | |
61 - (NSSet*)children { | |
62 return [self.childCoordinators copy]; | |
63 } | |
64 | |
65 - (void)addChildCoordinator:(BrowserCoordinator*)coordinator { | |
66 [self.childCoordinators addObject:coordinator]; | |
67 coordinator.browserState = self.browserState; | |
68 coordinator.parentCoordinator = self; | |
69 coordinator.rootViewController = self.viewController; | |
70 } | |
71 | |
72 - (BrowserCoordinator*)overlayCoordinator { | |
73 if (self.overlaying) | |
74 return self; | |
75 for (BrowserCoordinator* child in self.children) { | |
76 BrowserCoordinator* overlay = child.overlayCoordinator; | |
77 if (overlay) | |
78 return overlay; | |
79 } | |
80 return nil; | |
81 } | |
82 | |
83 - (void)addOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator { | |
84 // If this object has no children, then add |overlayCoordinator| as a child | |
85 // and mark it as such. | |
86 if ([self canAddOverlayCoordinator:overlayCoordinator]) { | |
87 [self addChildCoordinator:overlayCoordinator]; | |
88 overlayCoordinator.overlaying = YES; | |
89 } else if (self.childCoordinators.count == 1) { | |
90 [[self.childCoordinators anyObject] | |
91 addOverlayCoordinator:overlayCoordinator]; | |
92 } else { | |
93 CHECK(NO) << "Coordinators with multiple children must explicitly " | |
94 << "handle -addOverlayCoordinator: or return NO to " | |
95 << "-canAddOverlayCoordinator:"; | |
96 } | |
97 } | |
98 | |
99 - (void)removeOverlayCoordinator { | |
100 BrowserCoordinator* overlay = self.overlayCoordinator; | |
101 [overlay.parentCoordinator removeChildCoordinator:overlay]; | |
102 } | |
103 | |
104 - (BOOL)canAddOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator { | |
105 // By default, coordinators with no other children can add an overlay. | |
106 return self.childCoordinators.count == 0; | |
107 } | |
108 | |
109 - (void)removeChildCoordinator:(BrowserCoordinator*)coordinator { | |
110 [self.childCoordinators removeObject:coordinator]; | |
111 } | |
112 | |
113 @end | |
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