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FlutterAppLifecycleDelegate.mm
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1 // Copyright 2013 The Flutter 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 "flutter/shell/platform/darwin/macos/framework/Headers/FlutterAppLifecycleDelegate.h"
6 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterAppLifecycleDelegate_Internal.h"
7
8 #include <AppKit/AppKit.h>
9 #include <AppKit/NSApplication.h>
10 #include <Foundation/Foundation.h>
11 #include <objc/message.h>
12
13 #include "flutter/fml/logging.h"
14 #include "flutter/fml/paths.h"
15
16 @implementation FlutterAppLifecycleRegistrar {
17 NSMutableArray* _notificationUnsubscribers;
18 }
19
20 - (void)addObserverFor:(NSString*)name selector:(SEL)selector {
21 [[NSNotificationCenter defaultCenter] addObserver:self selector:selector name:name object:nil];
22 __block NSObject* blockSelf = self;
23 dispatch_block_t unsubscribe = ^{
24 [[NSNotificationCenter defaultCenter] removeObserver:blockSelf name:name object:nil];
25 };
26 [_notificationUnsubscribers addObject:[unsubscribe copy]];
27 }
28
29 - (instancetype)init {
30 if (self = [super init]) {
31 _notificationUnsubscribers = [[NSMutableArray alloc] init];
32
33 // Using a macro to avoid errors where the notification doesn't match the
34 // selector.
35 #ifdef OBSERVE_NOTIFICATION
36 #error OBSERVE_NOTIFICATION ALREADY DEFINED!
37 #else
38 #define OBSERVE_NOTIFICATION(SELECTOR) \
39 [self addObserverFor:NSApplication##SELECTOR##Notification selector:@selector(handle##SELECTOR:)]
40 #endif
41
42 OBSERVE_NOTIFICATION(WillFinishLaunching);
43 OBSERVE_NOTIFICATION(DidFinishLaunching);
44 OBSERVE_NOTIFICATION(WillBecomeActive);
45 OBSERVE_NOTIFICATION(DidBecomeActive);
46 OBSERVE_NOTIFICATION(WillResignActive);
47 OBSERVE_NOTIFICATION(DidResignActive);
48 OBSERVE_NOTIFICATION(WillTerminate);
49 OBSERVE_NOTIFICATION(WillHide);
50 OBSERVE_NOTIFICATION(DidHide);
51 OBSERVE_NOTIFICATION(WillUnhide);
52 OBSERVE_NOTIFICATION(DidUnhide);
53 OBSERVE_NOTIFICATION(DidChangeScreenParameters);
54 OBSERVE_NOTIFICATION(DidChangeOcclusionState);
55
56 #undef OBSERVE_NOTIFICATION
57
58 _delegates = [NSPointerArray weakObjectsPointerArray];
59 }
60 return self;
61 }
62
63 - (void)dealloc {
64 for (dispatch_block_t unsubscribe in _notificationUnsubscribers) {
65 unsubscribe();
66 }
67 [_notificationUnsubscribers removeAllObjects];
68 _delegates = nil;
69 _notificationUnsubscribers = nil;
70 }
71
72 static BOOL IsPowerOfTwo(NSUInteger x) {
73 return x != 0 && (x & (x - 1)) == 0;
74 }
75
76 - (void)addDelegate:(NSObject<FlutterAppLifecycleDelegate>*)delegate {
77 [_delegates addPointer:(__bridge void*)delegate];
78 if (IsPowerOfTwo([_delegates count])) {
79 [_delegates compact];
80 }
81 }
82
83 - (void)removeDelegate:(NSObject<FlutterAppLifecycleDelegate>*)delegate {
84 NSUInteger index = [[_delegates allObjects] indexOfObject:delegate];
85 if (index != NSNotFound) {
86 [_delegates removePointerAtIndex:index];
87 }
88 }
89
90 // This isn't done via performSelector because that can cause leaks due to the
91 // selector not being known. Using a macro to avoid mismatch errors between the
92 // notification and the selector.
93 #ifdef DISTRIBUTE_NOTIFICATION
94 #error DISTRIBUTE_NOTIFICATION ALREADY DEFINED!
95 #else
96 #define DISTRIBUTE_NOTIFICATION(SELECTOR) \
97 -(void)handle##SELECTOR : (NSNotification*)notification { \
98 for (NSObject<FlutterAppLifecycleDelegate> * delegate in _delegates) { \
99 if ([delegate respondsToSelector:@selector(handle##SELECTOR:)]) { \
100 [delegate handle##SELECTOR:notification]; \
101 } \
102 } \
103 }
104 #endif
105
106 DISTRIBUTE_NOTIFICATION(WillFinishLaunching)
107 DISTRIBUTE_NOTIFICATION(DidFinishLaunching)
108 DISTRIBUTE_NOTIFICATION(WillBecomeActive)
109 DISTRIBUTE_NOTIFICATION(DidBecomeActive)
110 DISTRIBUTE_NOTIFICATION(WillResignActive)
111 DISTRIBUTE_NOTIFICATION(DidResignActive)
112 DISTRIBUTE_NOTIFICATION(WillTerminate)
113 DISTRIBUTE_NOTIFICATION(WillHide)
114 DISTRIBUTE_NOTIFICATION(WillUnhide)
115 DISTRIBUTE_NOTIFICATION(DidHide)
116 DISTRIBUTE_NOTIFICATION(DidUnhide)
117 DISTRIBUTE_NOTIFICATION(DidChangeScreenParameters)
118 DISTRIBUTE_NOTIFICATION(DidChangeOcclusionState)
119
120 #undef DISTRIBUTE_NOTIFICATION
121
122 @end
FlutterAppLifecycleRegistrar
Definition: FlutterAppLifecycleDelegate.h:126
DISTRIBUTE_NOTIFICATION
#define DISTRIBUTE_NOTIFICATION(SELECTOR)
Definition: FlutterAppLifecycleDelegate.mm:96
FlutterAppLifecycleDelegate-p
Definition: FlutterAppLifecycleDelegate.h:21
FlutterAppLifecycleDelegate_Internal.h
OBSERVE_NOTIFICATION
#define OBSERVE_NOTIFICATION(SELECTOR)
FlutterAppLifecycleDelegate.h