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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
18 - (void)addObserverFor:(NSString*)name selector:(SEL)selector {
19 [[NSNotificationCenter defaultCenter] addObserver:self selector:selector name:name object:nil];
20 }
21
22 - (instancetype)init {
23 if (self = [super init]) {
24 // Using a macro to avoid errors where the notification doesn't match the
25 // selector.
26 #ifdef OBSERVE_NOTIFICATION
27 #error OBSERVE_NOTIFICATION ALREADY DEFINED!
28 #else
29 #define OBSERVE_NOTIFICATION(SELECTOR) \
30 [self addObserverFor:NSApplication##SELECTOR##Notification selector:@selector(handle##SELECTOR:)]
31 #endif
32
33 OBSERVE_NOTIFICATION(WillFinishLaunching);
34 OBSERVE_NOTIFICATION(DidFinishLaunching);
35 OBSERVE_NOTIFICATION(WillBecomeActive);
36 OBSERVE_NOTIFICATION(DidBecomeActive);
37 OBSERVE_NOTIFICATION(WillResignActive);
38 OBSERVE_NOTIFICATION(DidResignActive);
39 OBSERVE_NOTIFICATION(WillTerminate);
40 OBSERVE_NOTIFICATION(WillHide);
41 OBSERVE_NOTIFICATION(DidHide);
42 OBSERVE_NOTIFICATION(WillUnhide);
43 OBSERVE_NOTIFICATION(DidUnhide);
44 OBSERVE_NOTIFICATION(DidChangeScreenParameters);
45 OBSERVE_NOTIFICATION(DidChangeOcclusionState);
46
47 #undef OBSERVE_NOTIFICATION
48
49 _delegates = [NSPointerArray weakObjectsPointerArray];
50 }
51 return self;
52 }
53
54 static BOOL IsPowerOfTwo(NSUInteger x) {
55 return x != 0 && (x & (x - 1)) == 0;
56 }
57
58 - (void)addDelegate:(NSObject<FlutterAppLifecycleDelegate>*)delegate {
59 [_delegates addPointer:(__bridge void*)delegate];
60 if (IsPowerOfTwo([_delegates count])) {
61 [_delegates compact];
62 }
63 }
64
65 - (void)removeDelegate:(NSObject<FlutterAppLifecycleDelegate>*)delegate {
66 NSUInteger index = [[_delegates allObjects] indexOfObject:delegate];
67 if (index != NSNotFound) {
68 [_delegates removePointerAtIndex:index];
69 }
70 }
71
72 // This isn't done via performSelector because that can cause leaks due to the
73 // selector not being known. Using a macro to avoid mismatch errors between the
74 // notification and the selector.
75 #ifdef DISTRIBUTE_NOTIFICATION
76 #error DISTRIBUTE_NOTIFICATION ALREADY DEFINED!
77 #else
78 #define DISTRIBUTE_NOTIFICATION(SELECTOR) \
79 -(void)handle##SELECTOR : (NSNotification*)notification { \
80 for (NSObject<FlutterAppLifecycleDelegate> * delegate in _delegates) { \
81 if ([delegate respondsToSelector:@selector(handle##SELECTOR:)]) { \
82 [delegate handle##SELECTOR:notification]; \
83 } \
84 } \
85 }
86 #endif
87
88 DISTRIBUTE_NOTIFICATION(WillFinishLaunching)
89 DISTRIBUTE_NOTIFICATION(DidFinishLaunching)
90 DISTRIBUTE_NOTIFICATION(WillBecomeActive)
91 DISTRIBUTE_NOTIFICATION(DidBecomeActive)
92 DISTRIBUTE_NOTIFICATION(WillResignActive)
93 DISTRIBUTE_NOTIFICATION(DidResignActive)
94 DISTRIBUTE_NOTIFICATION(WillTerminate)
95 DISTRIBUTE_NOTIFICATION(WillHide)
96 DISTRIBUTE_NOTIFICATION(WillUnhide)
97 DISTRIBUTE_NOTIFICATION(DidHide)
98 DISTRIBUTE_NOTIFICATION(DidUnhide)
99 DISTRIBUTE_NOTIFICATION(DidChangeScreenParameters)
100 DISTRIBUTE_NOTIFICATION(DidChangeOcclusionState)
101
102 #undef DISTRIBUTE_NOTIFICATION
103
104 @end
FlutterAppLifecycleRegistrar
Definition: FlutterAppLifecycleDelegate.h:126
DISTRIBUTE_NOTIFICATION
#define DISTRIBUTE_NOTIFICATION(SELECTOR)
Definition: FlutterAppLifecycleDelegate.mm:78
FlutterAppLifecycleDelegate-p
Definition: FlutterAppLifecycleDelegate.h:21
FlutterAppLifecycleDelegate_Internal.h
OBSERVE_NOTIFICATION
#define OBSERVE_NOTIFICATION(SELECTOR)
FlutterAppLifecycleDelegate.h