Index: ios/chrome/browser/ui/settings/utils/pref_backed_boolean.mm |
diff --git a/ios/chrome/browser/ui/settings/utils/pref_backed_boolean.mm b/ios/chrome/browser/ui/settings/utils/pref_backed_boolean.mm |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4cf0491aa700a6917b93d7eec5013a8e1f2b2322 |
--- /dev/null |
+++ b/ios/chrome/browser/ui/settings/utils/pref_backed_boolean.mm |
@@ -0,0 +1,49 @@ |
+// Copyright 2016 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. |
+ |
+#import "ios/chrome/browser/ui/settings/utils/pref_backed_boolean.h" |
+ |
+#include "base/bind.h" |
+#include "components/prefs/pref_member.h" |
+#include "components/prefs/pref_service.h" |
+ |
+namespace { |
+ |
+// Adaptor function to allow invoking onChange as a base::Closure. |
+void OnChange(id<ObservableBoolean> object) { |
+ [object.observer booleanDidChange:object]; |
+} |
+ |
+} // namespace |
+ |
+@implementation PrefBackedBoolean { |
+ BooleanPrefMember _pref; |
+} |
+ |
+@synthesize observer = _observer; |
+ |
+- (id)initWithPrefService:(PrefService*)prefs prefName:(const char*)prefName { |
+ self = [super init]; |
+ if (self) { |
+ // Create a base::Closure that calls onChange. |
+ // Bind expects a refcounted object but allows us to pass a raw pointer |
+ // with Unretained. Since the closure will be deleted when |_pref| is |
+ // deleted, which happens when |self| is deleted, we know |self| will still |
+ // be valid when the closure is invoked. |
+ base::Closure onChangeClosure = |
+ base::Bind(&OnChange, base::Unretained(self)); |
+ _pref.Init(prefName, prefs, onChangeClosure); |
+ } |
+ return self; |
+} |
+ |
+- (BOOL)value { |
+ return _pref.GetValue(); |
+} |
+ |
+- (void)setValue:(BOOL)value { |
+ _pref.SetValue(value == YES); |
+} |
+ |
+@end |