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// Copyright 2018 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 UI_EVENTS_KEYBOARD_HOOK_H_
#define UI_EVENTS_KEYBOARD_HOOK_H_
#include <memory>
#include "base/callback.h"
#include "base/containers/flat_set.h"
#include "base/optional.h"
#include "ui/events/events_export.h"
namespace ui {
class KeyEvent;
// Intercepts keyboard events typically handled by the OS or browser.
// Destroying the instance will unregister and clean up the keyboard hook.
class EVENTS_EXPORT KeyboardHook {
public:
using KeyEventCallback = base::RepeatingCallback<void(KeyEvent* event)>;
virtual ~KeyboardHook() = default;
// Creates a platform specific implementation.
// |native_key_codes| is the set of key codes which will be intercepted, if
// it is empty, this class will attempt to intercept all keys.
// |callback| is called for each key which is intercepted.
// Returns a valid instance if the hook was created and successfully
// registered otherwise nullptr.
static std::unique_ptr<KeyboardHook> Create(
base::Optional<base::flat_set<int>> native_key_codes,
KeyEventCallback callback);
// True if |native_key_code| is reserved for an active KeyboardLock request.
virtual bool IsKeyLocked(int native_key_code) = 0;
};
} // namespace ui
#endif // UI_EVENTS_KEYBOARD_HOOK_H_
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