1 #ifndef __DALI_INTERNAL_SCENE_GRAPH_PAN_GESTURE_H__
2 #define __DALI_INTERNAL_SCENE_GRAPH_PAN_GESTURE_H__
5 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/common/vector-wrapper.h>
23 #include <dali/public-api/events/pan-gesture.h>
24 #include <dali/internal/update/common/property-owner.h>
25 #include <dali/internal/update/gestures/gesture-properties.h>
35 struct PanGestureProfiling;
41 * The latest pan gesture information is stored in this scene object.
43 class PanGesture : public PropertyOwner
55 SMOOTHING_NONE, // no smoothing
56 SMOOTHING_LAST_VALUE, // smooth between last value and latest value
59 static const PredictionMode DEFAULT_PREDICTION_MODE;
60 static const int NUM_PREDICTION_MODES;
62 static const SmoothingMode DEFAULT_SMOOTHING_MODE;
63 static const int NUM_SMOOTHING_MODES;
65 // Latest Pan Information
68 * Only stores the information we actually require from Dali::PanGesture
73 * Stores the velocity, displacement and position.
84 Info( const Info& rhs )
85 : velocity( rhs.velocity ),
86 displacement( rhs.displacement ),
87 position( rhs.position )
94 Info& operator=( const Info& rhs )
96 velocity = rhs.velocity;
97 displacement = rhs.displacement;
98 position = rhs.position;
106 Vector2 displacement;
115 state( Gesture::Clear ),
123 PanInfo( const PanInfo& rhs )
127 screen( rhs.screen ),
133 * Assignment operator
135 PanInfo& operator=( const PanInfo& rhs )
146 * Assignment operator
147 * @param[in] gesture A Dali::Gesture
149 PanInfo& operator=( const Dali::PanGesture& rhs )
154 local.velocity = rhs.velocity;
155 local.displacement = rhs.displacement;
156 local.position = rhs.position;
158 screen.velocity = rhs.screenVelocity;
159 screen.displacement = rhs.screenDisplacement;
160 screen.position = rhs.screenPosition;
167 Gesture::State state;
173 typedef std::vector<PanInfo> PanInfoHistory;
174 typedef PanInfoHistory::iterator PanInfoHistoryIter;
175 typedef PanInfoHistory::const_iterator PanInfoHistoryConstIter;
178 static const unsigned int PAN_GESTURE_HISTORY = 10u;
183 * Create a new PanGesture
185 static PanGesture* New();
190 virtual ~PanGesture();
193 * Adds a PanGesture to the internal circular-buffer waiting to be handled by UpdateProperties.
194 * @param[in] gesture The latest pan gesture.
196 void AddGesture( const Dali::PanGesture& gesture );
199 * @brief Removes pan events from the history that are older than maxAge, leaving at least minEvents
201 * @param[in] panHistory The pan event history container
202 * @param[in] currentTime The current frame time
203 * @param[in] maxAge Maximum age of an event before removing (in millis)
204 * @param[in] minEvents The minimum number of events to leave in history, oldest events are removed before newest
206 void RemoveOldHistory(PanInfoHistory& panHistory, unsigned int currentTime, unsigned int maxAge, unsigned int minEvents);
209 * Uses elapsed time and time stamps
211 void PredictiveAlgorithm1(int eventsThisFrame, PanInfo& gestureOut, PanInfoHistory& panHistory, unsigned int lastVSyncTime, unsigned int nextVSyncTime);
214 * Uses last two gestures
216 * @param[in] justStarted Whether the pan has just started.
217 * @param[out] gestureOut Output gesture using average values from last two gestures
218 * @param[in] lastVSyncTime The time to set on gestureOut.
220 void SmoothingAlgorithm1(bool justStarted, PanInfo& gestureOut, unsigned int lastVSyncTime);
223 * Future smoothing method, implementation not complete
225 void SmoothingAlgorithm2(bool justStarted, PanInfo& gestureOut, unsigned int lastVSyncTime);
228 * Called by the update manager so that we can update the value of our properties.
229 * @param[in] nextRenderTime The estimated time of the next render (in milliseconds).
230 * @return true, if properties were updated.
232 virtual bool UpdateProperties( unsigned int lastRenderTime, unsigned int nextRenderTime );
235 * Retrieves a reference to the panning flag property.
236 * @return The panning flag property.
238 const GesturePropertyBool& GetPanningProperty() const;
241 * Retrieves a reference to the screen position property.
242 * @return The screen position property.
244 const GesturePropertyVector2& GetScreenPositionProperty() const;
247 * Retrieves a reference to the screen velocity property.
248 * @return The screen velocity property.
250 const GesturePropertyVector2& GetScreenVelocityProperty() const;
253 * Retrieves a reference to the screen displacement property.
254 * @return The screen displacement property.
256 const GesturePropertyVector2& GetScreenDisplacementProperty() const;
259 * Retrieves a reference to the local position property.
260 * @return The local position property.
262 const GesturePropertyVector2& GetLocalPositionProperty() const;
265 * Retrieves a reference to the local displacement property.
266 * @return The local displacement property.
268 const GesturePropertyVector2& GetLocalDisplacementProperty() const;
271 * Retrieves a reference to the local velocity property.
272 * @return The local velocity property.
274 const GesturePropertyVector2& GetLocalVelocityProperty() const;
277 * @brief Sets the prediction mode of the pan gesture
279 * @param[in] mode The prediction mode
281 void SetPredictionMode(PredictionMode mode);
284 * @brief Sets the prediction amount of the pan gesture
286 * @param[in] amount The prediction amount in milliseconds
288 void SetPredictionAmount(unsigned int amount);
291 * @brief Sets the prediction mode of the pan gesture
293 * @param[in] mode The prediction mode
295 void SetSmoothingMode(SmoothingMode mode);
298 * @brief Sets the amount of smoothing to apply for the current smoothing mode
300 * @param[in] amount The amount of smoothing [0.0f,1.0f]
302 void SetSmoothingAmount(float amount);
305 * Called to provide pan-gesture profiling information.
307 void EnableProfiling();
312 * Protected constructor.
317 PanGesture(const PanGesture&);
320 PanGesture& operator=(const PanGesture&);
323 virtual void ResetDefaultProperties( BufferIndex updateBufferIndex );
328 GesturePropertyBool mPanning; ///< panning flag
329 GesturePropertyVector2 mScreenPosition; ///< screen-position
330 GesturePropertyVector2 mScreenDisplacement; ///< screen-displacement
331 GesturePropertyVector2 mScreenVelocity; ///< screen-velocity
332 GesturePropertyVector2 mLocalPosition; ///< local-position
333 GesturePropertyVector2 mLocalDisplacement; ///< local-displacement
334 GesturePropertyVector2 mLocalVelocity; ///< local-velocity
336 PanInfo mGestures[PAN_GESTURE_HISTORY]; ///< Circular buffer storing the 4 most recent gestures.
337 PanInfoHistory mPanHistory;
338 PanInfoHistory mPredictionHistory;
339 unsigned int mWritePosition; ///< The next PanInfo buffer to write to. (starts at 0)
340 unsigned int mReadPosition; ///< The next PanInfo buffer to read. (starts at 0)
342 PanInfo mEventGesture; ///< Result of all pan events received this frame
343 PanInfo mLastEventGesture; ///< The last frame's event gesture.
344 PanInfo mLastGesture; ///< The latest gesture. (this update frame)
345 PanInfo mLatestGesture; ///< The latest gesture. (this update frame)
346 bool mInGesture; ///< True if the gesture is currently being handled i.e. between Started <-> Finished/Cancelled
348 PredictionMode mPredictionMode; ///< The pan gesture prediction mode
349 unsigned int mPredictionAmount; ///< how far into future to predict in milliseconds
350 SmoothingMode mSmoothingMode; ///< The pan gesture prediction mode
351 float mSmoothingAmount; ///< How much smoothing to apply [0.0f,1.0f]
352 PanGestureProfiling* mProfiling; ///< NULL unless pan-gesture profiling information is required.
355 } // namespace SceneGraph
357 } // namespace Internal
361 #endif // __DALI_INTERNAL_SCENE_GRAPH_PAN_GESTURE_H__