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// Copyright 2015 The Chromium Authors
// 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 "base/callback_list.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:
using OnURLOpenedCallbackList =
base::RepeatingCallbackList<void(OmniboxLog*)>;
using OnURLOpenedCallback = OnURLOpenedCallbackList::CallbackType;
// Returns the instance of OmniboxEventGlobalTracker.
static OmniboxEventGlobalTracker* GetInstance();
// Registers `cb` to be invoked when user open a URL from the omnibox.
base::CallbackListSubscription RegisterCallback(
const OnURLOpenedCallback& cb);
// Called to notify all registered callbacks that a URL was opened from the
// omnibox.
void OnURLOpened(OmniboxLog* log);
private:
friend struct base::DefaultSingletonTraits<OmniboxEventGlobalTracker>;
OmniboxEventGlobalTracker();
~OmniboxEventGlobalTracker();
OmniboxEventGlobalTracker(const OmniboxEventGlobalTracker&) = delete;
OmniboxEventGlobalTracker& operator=(const OmniboxEventGlobalTracker&) =
delete;
OnURLOpenedCallbackList on_url_opened_callback_list_;
};
#endif // COMPONENTS_OMNIBOX_BROWSER_OMNIBOX_EVENT_GLOBAL_TRACKER_H_
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