1 files changed, 152 insertions, 0 deletions
diff --git a/xbmc/utils/MovingSpeed.h b/xbmc/utils/MovingSpeed.h
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+++ b/xbmc/utils/MovingSpeed.h
@@ -0,0 +1,152 @@
+/*
+ *  Copyright (C) 2022 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include <map>
+#include <stdint.h>
+#include <string_view>
+
+namespace UTILS
+{
+namespace MOVING_SPEED
+{
+
+struct EventCfg
+{
+  /*!
+   * \param acceleration Acceleration in pixels per second (px/sec)
+   * \param maxVelocity Max movement speed, it depends from acceleration value,
+   *        a suitable value could be (acceleration value)*3. Set 0 to disable it
+   * \param resetTimeout Resets acceleration speed if idle for specified millisecs
+   */
+  EventCfg(float acceleration, float maxVelocity, uint32_t resetTimeout)
+    : m_acceleration{acceleration}, m_maxVelocity{maxVelocity}, m_resetTimeout{resetTimeout}
+  {
+  }
+
+  /*!
+   * \param acceleration Acceleration in pixels per second (px/sec)
+   * \param maxVelocity Max movement speed, it depends from acceleration value,
+   *        a suitable value could be (acceleration value)*3. Set 0 to disable it
+   * \param resetTimeout Resets acceleration speed if idle for specified millisecs
+   * \param delta Specify the minimal increment step, and the result of distance
+            value will be rounded by delta. Set 0 to disable it
+   */
+  EventCfg(float acceleration, float maxVelocity, uint32_t resetTimeout, float delta)
+    : m_acceleration{acceleration},
+      m_maxVelocity{maxVelocity},
+      m_resetTimeout{resetTimeout},
+      m_delta{delta}
+  {
+  }
+
+  float m_acceleration;
+  float m_maxVelocity;
+  uint32_t m_resetTimeout;
+  float m_delta{0};
+};
+
+enum class EventType
+{
+  NONE = 0,
+  UP,
+  DOWN,
+  LEFT,
+  RIGHT
+};
+
+typedef std::map<EventType, EventCfg> MapEventConfig;
+
+/*!
+ * \brief Class to calculate the velocity for a motion effect.
+ * To ensure it works, the GetUpdatedDistance method must be called at each
+ * input received (e.g. continuous key press of same key on the keyboard).
+ * The motion effect will stop at the event ID change (different key pressed).
+ */
+class CMovingSpeed
+{
+public:
+  /*!
+   * \brief Add the configuration for an event
+   * \param eventId The id for the event, must be unique
+   * \param acceleration Acceleration in pixels per second (px/sec)
+   * \param maxVelocity Max movement speed, it depends from acceleration value,
+   *        a suitable value could be (acceleration value)*3. Set 0 to disable it
+   * \param resetTimeout Resets acceleration speed if idle for specified millisecs
+   */
+  void AddEventConfig(uint32_t eventId,
+                      float acceleration,
+                      float maxVelocity,
+                      uint32_t resetTimeout);
+
+  /*!
+   * \brief Add the configuration for an event
+   * \param eventId The id for the event, must be unique
+   * \param event The event configuration
+   */
+  void AddEventConfig(uint32_t eventId, EventCfg event);
+
+  /*!
+   * \brief Add a map of events configuration
+   * \param configs The map of events configuration where key value is event id, 
+   */
+  void AddEventMapConfig(MapEventConfig& configs);
+
+  /*!
+   * \brief Reset stored velocity to all events
+   * \param event The event configuration
+   */
+  void Reset();
+
+  /*!
+   * \brief Reset stored velocity for a specific event
+   * \param event The event ID
+   */
+  void Reset(uint32_t eventId);
+
+  /*!
+   * \brief Get the updated distance based on acceleration speed
+   * \param eventId The id for the event to handle
+   * \return The distance
+   */
+  float GetUpdatedDistance(uint32_t eventId);
+
+  /*!
+   * \brief Get the updated distance based on acceleration speed
+   * \param eventType The event type to handle
+   * \return The distance
+   */
+  float GetUpdatedDistance(EventType eventType)
+  {
+    return GetUpdatedDistance(static_cast<uint32_t>(eventType));
+  }
+
+private:
+  struct EventData
+  {
+    EventData(EventCfg config) : m_config{config} {}
+
+    EventCfg m_config;
+    float m_currentVelocity{1.0f};
+    uint32_t m_lastFrameTime{0};
+  };
+
+  uint32_t m_currentEventId{0};
+  std::map<uint32_t, EventData> m_eventsData;
+};
+
+/*!
+ * \brief Parse a string event type to enum EventType.
+ * \param eventType The event type as string
+ * \return The EventType if has success, otherwise EventType::NONE
+ */
+EventType ParseEventType(std::string_view eventType);
+
+} // namespace MOVING_SPEED
+} // namespace UTILS