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// Copyright 2015 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.
#ifndef COMPONENTS_OMNIBOX_BROWSER_OMNIBOX_EVENT_GLOBAL_TRACKER_H_
#define COMPONENTS_OMNIBOX_BROWSER_OMNIBOX_EVENT_GLOBAL_TRACKER_H_
#include <memory>
#include "base/callback_list.h"
#include "base/macros.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
} // namespace base
struct OmniboxLog;
// Omnibox code tracks events on a per-user-context basis, but there are
// several clients who need to observe these events for all user contexts
// (e.g., all Profiles in the //chrome embedder). This class serves as an
// intermediary to bridge the gap: omnibox code calls the
// OmniboxEventGlobalTracker singleton on an event of interest, and it then
// forwards the event to its registered observers.
class OmniboxEventGlobalTracker {
public:
typedef base::Callback<void(OmniboxLog*)> OnURLOpenedCallback;
// Returns the instance of OmniboxEventGlobalTracker.
static OmniboxEventGlobalTracker* GetInstance();
// Registers |cb| to be invoked when user open an URL from the omnibox.
std::unique_ptr<base::CallbackList<void(OmniboxLog*)>::Subscription>
RegisterCallback(const OnURLOpenedCallback& cb);
// Called to notify all registered callbacks that an URL was opened from
// the omnibox.
void OnURLOpened(OmniboxLog* log);
private:
friend struct base::DefaultSingletonTraits<OmniboxEventGlobalTracker>;
OmniboxEventGlobalTracker();
~OmniboxEventGlobalTracker();
base::CallbackList<void(OmniboxLog*)> on_url_opened_callback_list_;
DISALLOW_COPY_AND_ASSIGN(OmniboxEventGlobalTracker);
};
#endif // COMPONENTS_OMNIBOX_BROWSER_OMNIBOX_EVENT_GLOBAL_TRACKER_H_
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