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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 #include "ui/events/platform/platform_event_source.h" | 5 #include "ui/events/platform/platform_event_source.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/lazy_instance.h" | |
9 #include "base/memory/ptr_util.h" | 10 #include "base/memory/ptr_util.h" |
10 #include "base/message_loop/message_loop.h" | 11 #include "base/message_loop/message_loop.h" |
12 #include "base/threading/thread_local.h" | |
11 #include "ui/events/platform/platform_event_dispatcher.h" | 13 #include "ui/events/platform/platform_event_dispatcher.h" |
12 #include "ui/events/platform/platform_event_observer.h" | 14 #include "ui/events/platform/platform_event_observer.h" |
13 #include "ui/events/platform/scoped_event_dispatcher.h" | 15 #include "ui/events/platform/scoped_event_dispatcher.h" |
14 | 16 |
15 namespace ui { | 17 namespace ui { |
18 namespace { | |
16 | 19 |
17 // static | 20 // PlatformEventSource singleton is thread local so that different instances |
18 PlatformEventSource* PlatformEventSource::instance_ = NULL; | 21 // can be used on different threads (e.g. WindowServer thread vs. browser UI |
22 // thread). | |
23 base::LazyInstance<base::ThreadLocalPointer<PlatformEventSource>>::Leaky | |
sky
2017/06/27 19:58:57
Same comment here. What code in chrome/ash is maki
mfomitchev
2017/06/27 22:14:55
Aura does it: https://cs.chromium.org/chromium/src
sky
2017/06/28 00:22:02
That's only for the LOCAL case. How are we trigger
mfomitchev
2017/06/28 15:56:32
Oops, you are right, this isn't needed. I misread
mfomitchev
2017/07/12 20:37:13
I remember now there was another reason I made thi
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24 lazy_tls_ptr = LAZY_INSTANCE_INITIALIZER; | |
25 | |
26 } // namespace | |
19 | 27 |
20 PlatformEventSource::PlatformEventSource() | 28 PlatformEventSource::PlatformEventSource() |
21 : overridden_dispatcher_(NULL), | 29 : overridden_dispatcher_(NULL), |
22 overridden_dispatcher_restored_(false) { | 30 overridden_dispatcher_restored_(false) { |
23 CHECK(!instance_) << "Only one platform event source can be created."; | 31 CHECK(!lazy_tls_ptr.Pointer()->Get()) |
24 instance_ = this; | 32 << "Only one platform event source can be created per thread."; |
33 lazy_tls_ptr.Pointer()->Set(this); | |
25 } | 34 } |
26 | 35 |
27 PlatformEventSource::~PlatformEventSource() { | 36 PlatformEventSource::~PlatformEventSource() { |
28 CHECK_EQ(this, instance_); | 37 CHECK_EQ(this, lazy_tls_ptr.Pointer()->Get()); |
29 instance_ = NULL; | 38 lazy_tls_ptr.Pointer()->Set(nullptr); |
30 } | 39 } |
31 | 40 |
32 PlatformEventSource* PlatformEventSource::GetInstance() { return instance_; } | 41 PlatformEventSource* PlatformEventSource::GetInstance() { |
42 return lazy_tls_ptr.Pointer()->Get(); | |
43 } | |
33 | 44 |
34 void PlatformEventSource::AddPlatformEventDispatcher( | 45 void PlatformEventSource::AddPlatformEventDispatcher( |
35 PlatformEventDispatcher* dispatcher) { | 46 PlatformEventDispatcher* dispatcher) { |
36 CHECK(dispatcher); | 47 CHECK(dispatcher); |
37 dispatchers_.AddObserver(dispatcher); | 48 dispatchers_.AddObserver(dispatcher); |
38 OnDispatcherListChanged(); | 49 OnDispatcherListChanged(); |
39 } | 50 } |
40 | 51 |
41 void PlatformEventSource::RemovePlatformEventDispatcher( | 52 void PlatformEventSource::RemovePlatformEventDispatcher( |
42 PlatformEventDispatcher* dispatcher) { | 53 PlatformEventDispatcher* dispatcher) { |
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101 | 112 |
102 void PlatformEventSource::OnDispatcherListChanged() { | 113 void PlatformEventSource::OnDispatcherListChanged() { |
103 } | 114 } |
104 | 115 |
105 void PlatformEventSource::OnOverriddenDispatcherRestored() { | 116 void PlatformEventSource::OnOverriddenDispatcherRestored() { |
106 CHECK(overridden_dispatcher_); | 117 CHECK(overridden_dispatcher_); |
107 overridden_dispatcher_restored_ = true; | 118 overridden_dispatcher_restored_ = true; |
108 } | 119 } |
109 | 120 |
110 } // namespace ui | 121 } // namespace ui |
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