| // Copyright (c) 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_VIEWS_INPUT_EVENT_ACTIVATION_PROTECTOR_H_ |
| #define UI_VIEWS_INPUT_EVENT_ACTIVATION_PROTECTOR_H_ |
| |
| #include "base/macros.h" |
| #include "base/time/time.h" |
| #include "ui/views/views_export.h" |
| |
| namespace ui { |
| class Event; |
| } |
| |
| namespace views { |
| |
| // The goal of this class is to prevent potentially unintentional user |
| // interaction with a UI element. |
| class VIEWS_EXPORT InputEventActivationProtector { |
| public: |
| InputEventActivationProtector() = default; |
| ~InputEventActivationProtector() = default; |
| |
| // Updates the state of the protector based off of visibility changes. This |
| // method must be called when the visibility of the view is changed. |
| void VisibilityChanged(bool is_visible); |
| |
| // Returns true if the event is a mouse, touch, or pointer event that took |
| // place within the double-click time interval after |view_shown_time_stamp_|. |
| bool IsPossiblyUnintendedInteraction(const ui::Event& event); |
| |
| // Resets the state for click tracking. |
| void ResetForTesting(); |
| |
| private: |
| // Timestamp of when the view being tracked is first shown. |
| base::TimeTicks view_shown_time_stamp_; |
| // Timestamp of the last event. |
| base::TimeTicks last_event_timestamp_; |
| // Number of repeated UI events with short intervals. |
| size_t repeated_event_count_ = 0; |
| |
| DISALLOW_COPY_AND_ASSIGN(InputEventActivationProtector); |
| }; |
| |
| } // namespace views |
| |
| #endif // UI_VIEWS_INPUT_EVENT_ACTIVATION_PROTECTOR_H_ |