1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/app_launcher.h"
#include "base/command_line.h"
#include "base/prefs/pref_registry_simple.h"
#include "base/prefs/pref_service.h"
#include "base/threading/sequenced_worker_pool.h"
#include "chrome/browser/browser_process.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/browser_thread.h"
#if defined(OS_WIN)
#include "chrome/installer/launcher_support/chrome_launcher_support.h"
#include "chrome/installer/util/browser_distribution.h"
#endif
namespace extensions {
namespace {
#if defined(OS_WIN)
void UpdatePrefAndCallCallbackOnUI(
bool result,
const OnAppLauncherEnabledCompleted& completion_callback) {
PrefService* prefs = g_browser_process->local_state();
prefs->SetBoolean(prefs::kAppLauncherIsEnabled, result);
completion_callback.Run(result);
}
void IsAppLauncherInstalledOnBlockingPool(
const OnAppLauncherEnabledCompleted& completion_callback) {
DCHECK(content::BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
bool result = chrome_launcher_support::IsAppLauncherPresent();
content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
base::Bind(UpdatePrefAndCallCallbackOnUI, result, completion_callback));
}
#endif
} // namespace
enum AppLauncherState {
APP_LAUNCHER_UNKNOWN,
APP_LAUNCHER_ENABLED,
APP_LAUNCHER_DISABLED,
};
AppLauncherState SynchronousAppLauncherChecks() {
#if defined(USE_ASH)
return APP_LAUNCHER_ENABLED;
#elif !defined(OS_WIN)
return APP_LAUNCHER_DISABLED;
#else
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kShowAppListShortcut)) {
return APP_LAUNCHER_ENABLED;
}
if (!BrowserDistribution::GetDistribution()->AppHostIsSupported())
return APP_LAUNCHER_DISABLED;
return APP_LAUNCHER_UNKNOWN;
#endif
}
void UpdateIsAppLauncherEnabled(
const OnAppLauncherEnabledCompleted& completion_callback) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
AppLauncherState state = SynchronousAppLauncherChecks();
if (state != APP_LAUNCHER_UNKNOWN) {
bool is_enabled = state == APP_LAUNCHER_ENABLED;
PrefService* prefs = g_browser_process->local_state();
prefs->SetBoolean(prefs::kAppLauncherIsEnabled, is_enabled);
completion_callback.Run(is_enabled);
return;
}
#if defined(OS_WIN)
content::BrowserThread::PostBlockingPoolTask(
FROM_HERE,
base::Bind(&IsAppLauncherInstalledOnBlockingPool,
completion_callback));
#else
// SynchronousAppLauncherChecks() never returns APP_LAUNCHER_UNKNOWN on
// !defined(OS_WIN), so this path is never reached.
NOTREACHED();
#endif
}
bool IsAppLauncherEnabled() {
PrefService* prefs = g_browser_process->local_state();
// In some tests, the prefs aren't initialised, but the NTP still needs to
// work.
if (!prefs)
return SynchronousAppLauncherChecks() == APP_LAUNCHER_ENABLED;
return prefs->GetBoolean(prefs::kAppLauncherIsEnabled);
}
namespace app_launcher {
void RegisterPrefs(PrefRegistrySimple* registry) {
// If it is impossible to synchronously determine whether the app launcher is
// enabled, assume it is disabled. Anything that needs to know the absolute
// truth should call UpdateIsAppLauncherEnabled().
//
// This pref is just a cache of the value from the registry from last time
// Chrome ran. To avoid having the NTP block on a registry check, it guesses
// that the value hasn't changed since last time it was checked, using this
// preference.
bool is_enabled = SynchronousAppLauncherChecks() == APP_LAUNCHER_ENABLED;
registry->RegisterBooleanPref(prefs::kAppLauncherIsEnabled, is_enabled);
}
} // namespace app_launcher
} // namespace extensions
|
