chromium/components/feature_engagement/internal/once_condition_validator.h

// Copyright 2017 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_FEATURE_ENGAGEMENT_INTERNAL_ONCE_CONDITION_VALIDATOR_H_
#define COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_ONCE_CONDITION_VALIDATOR_H_

#include <optional>
#include <unordered_set>

#include "base/feature_list.h"
#include "components/feature_engagement/internal/condition_validator.h"
#include "components/feature_engagement/public/feature_list.h"

namespace feature_engagement {
class AvailabilityModel;
class DisplayLockController;
class EventModel;
class TimeProvider;

// An ConditionValidator that will ensure that each base::Feature will meet
// conditions maximum one time for any given session.
// It has the following requirements:
// - The EventModel is ready.
// - No other in-product help is currently showing.
// - FeatureConfig for the feature is valid.
// - This is the first time the given base::Feature meets all above stated
//   conditions.
//
// NOTE: This ConditionValidator fully ignores whether the base::Feature is
// enabled or not and any other configuration specified in the FeatureConfig.
// In practice this leads this ConditionValidator to be well suited for a
// demonstration mode of in-product help.
class OnceConditionValidator : public ConditionValidator { … };

}  // namespace feature_engagement

#endif  // COMPONENTS_FEATURE_ENGAGEMENT_INTERNAL_ONCE_CONDITION_VALIDATOR_H_