1 #ifndef __DALI_TOUCH_DATA_H__
2 #define __DALI_TOUCH_DATA_H__
5 * Copyright (c) 2018 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.
25 #include <dali/public-api/common/dali-common.h>
26 #include <dali/public-api/events/device.h>
27 #include <dali/public-api/events/point-state.h>
28 #include <dali/public-api/object/base-handle.h>
29 #include <dali/public-api/math/degree.h>
30 #include <dali/public-api/events/mouse-button.h>
35 namespace Internal DALI_INTERNAL
41 * @addtogroup dali_core_events
49 * @brief Touch events are a collection of points at a specific moment in time.
51 * When a multi-touch event occurs, each point represents the points that are currently being
52 * touched or the points where a touch has stopped.
54 * The first point is the primary point that's used for hit-testing.
56 * @note As this is a handle to an internal object, it should not be copied (or used in a container) as all that will do is copy the handle to the same object.
57 * The internal object can change which may not be what an application writer expects.
58 * If data does need to be stored in the application, then only the required data should be saved (retrieved using the methods of this class).
60 * Should not use this in a TouchData container as it is just a handle and the internal object can change.
62 class DALI_CORE_API TouchData : public BaseHandle
66 // Construction & Destruction
69 * @brief An uninitialized TouchData instance.
71 * Calling member functions with an uninitialized TouchData handle is not allowed.
77 * @brief Copy constructor.
80 * @param[in] other The TouchData to copy from
82 TouchData( const TouchData& other );
94 * @brief Assignment Operator.
97 * @param[in] other The TouchData to copy from
98 * @return A reference to this
100 TouchData& operator=( const TouchData& other );
105 * @brief Returns the time (in ms) that the touch event occurred.
108 * @return The time (in ms) that the touch event occurred
110 unsigned long GetTime() const;
113 * @brief Returns the total number of points in this TouchData.
116 * @return Total number of Points
118 std::size_t GetPointCount() const;
121 * @brief Returns the ID of the device used for the Point specified.
123 * Each point has a unique device ID which specifies the device used for that
124 * point. This is returned by this method.
127 * @param[in] point The point required
128 * @return The Device ID of this point
129 * @note If point is greater than GetPointCount() then this method will return -1.
131 int32_t GetDeviceId( std::size_t point ) const;
134 * @brief Retrieves the State of the point specified.
137 * @param[in] point The point required
138 * @return The state of the point specified
139 * @note If point is greater than GetPointCount() then this method will return PointState::FINISHED.
142 PointState::Type GetState( std::size_t point ) const;
145 * @brief Retrieves the actor that was underneath the point specified.
148 * @param[in] point The point required
149 * @return The actor that was underneath the point specified
150 * @note If point is greater than GetPointCount() then this method will return an empty handle.
152 Actor GetHitActor( std::size_t point ) const;
155 * @brief Retrieves the co-ordinates relative to the top-left of the hit-actor at the point specified.
158 * @param[in] point The point required
159 * @return The co-ordinates relative to the top-left of the hit-actor of the point specified
161 * @note The top-left of an actor is (0.0, 0.0, 0.5).
162 * @note If you require the local coordinates of another actor (e.g the parent of the hit actor),
163 * then you should use Actor::ScreenToLocal().
164 * @note If point is greater than GetPointCount() then this method will return Vector2::ZERO.
166 const Vector2& GetLocalPosition( std::size_t point ) const;
169 * @brief Retrieves the co-ordinates relative to the top-left of the screen of the point specified.
172 * @param[in] point The point required
173 * @return The co-ordinates relative to the top-left of the screen of the point specified
174 * @note If point is greater than GetPointCount() then this method will return Vector2::ZERO.
176 const Vector2& GetScreenPosition( std::size_t point ) const;
179 * @brief Retrieves the radius of the press point.
181 * This is the average of both the horizontal and vertical radii of the press point.
184 * @param[in] point The point required
185 * @return The radius of the press point
186 * @note If point is greater than GetPointCount() then this method will return 0.0f.
188 float GetRadius( std::size_t point ) const;
191 * @brief Retrieves BOTH the horizontal and the vertical radii of the press point.
194 * @param[in] point The point required
195 * @return The horizontal and vertical radii of the press point
196 * @note If point is greater than GetPointCount() then this method will return Vector2::ZERO.
198 const Vector2& GetEllipseRadius( std::size_t point ) const;
201 * @brief Retrieves the touch pressure.
203 * The pressure range starts at 0.0f.
204 * Normal pressure is defined as 1.0f.
205 * A value between 0.0f and 1.0f means light pressure has been applied.
206 * A value greater than 1.0f means more pressure than normal has been applied.
209 * @param[in] point The point required
210 * @return The touch pressure
211 * @note If point is greater than GetPointCount() then this method will return 1.0f.
213 float GetPressure( std::size_t point ) const;
216 * @brief Retrieves the angle of the press point relative to the Y-Axis.
219 * @param[in] point The point required
220 * @return The angle of the press point
221 * @note If point is greater than GetPointCount() then this method will return Degree().
223 Degree GetAngle( std::size_t point ) const;
226 * @brief Get the device class type the mouse/touch event originated from.
228 * The device class type is classification type of the input device of event received.
230 * @param[in] point The point required
231 * @return The type of the device class
233 Device::Class::Type GetDeviceClass( std::size_t point ) const;
236 * @brief Get the device subclass type the mouse/touch event originated from.
238 * The device subclass type is subclassification type of the input device of event received.
240 * @param[in] point The point required
241 * @return The type of the device subclass
243 Device::Subclass::Type GetDeviceSubclass( std::size_t point ) const;
247 * @brief Get mouse device's button value (ex: right/left button)
250 * @param[in] point The point required
251 * @return The mouse button value
253 MouseButton::Type GetMouseButton( std::size_t point ) const;
256 public: // Not intended for application developers
260 * @brief This constructor is used internally to Create an initialized TouchData handle.
263 * @param[in] touchData A pointer to a newly allocated Dali resource
265 explicit DALI_INTERNAL TouchData( Internal::TouchData* touchData );
274 #endif // __DALI_TOUCH_DATA_H__