1 #ifndef __DALI_LONG_PRESS_GESTURE_DETECTOR_H__
2 #define __DALI_LONG_PRESS_GESTURE_DETECTOR_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/events/gesture-detector.h>
23 #include <dali/public-api/signals/dali-signal-v2.h>
28 namespace Internal DALI_INTERNAL
30 class LongPressGestureDetector;
33 struct LongPressGesture;
36 * @brief This class emits a signals when a long press gesture occurs that meets the requirements set by the application.
37 * @see LongPressGestureDetector::SetTouchesRequired.
39 * For any valid long press, two signals will be emitted:
40 * - First identifying the beginning (state = Started) i.e. when fingers held down for the required time.
41 * - Second identifying the ending (state = Finished) i.e. when fingers are released.
43 * The application programmer can use this gesture detector as follows:
45 * LongPressGestureDetector detector = LongPressGestureDetector::New();
46 * detector.Attach(myActor);
47 * detector.DetectedSignal().Connect(this, &MyApplication::OnLongPress);
50 * @see LongPressGesture
52 class DALI_IMPORT_API LongPressGestureDetector : public GestureDetector
56 typedef SignalV2< void ( Actor, const LongPressGesture& ) > DetectedSignalV2; ///< Gesture detected signal type
59 static const char* const SIGNAL_LONG_PRESS_DETECTED; ///< name "long-press-detected"
61 public: // Creation & Destruction
64 * @brief Create an uninitialized LongPressGestureDetector; this can be initialized with LongPressGestureDetector::New().
66 * Calling member functions with an uninitialized Dali::Object is not allowed.
68 LongPressGestureDetector();
71 * @brief Create an initialized LongPressGestureDetector.
73 * By default, this would create a gesture detector that requires only one touch.
74 * @return A handle to a newly allocated Dali resource.
76 static LongPressGestureDetector New();
79 * @brief Create an initialized LongPressGestureDetector with the number of touches required.
81 * A long press gesture will be emitted from this detector if the number of fingers touching the
82 * screen is equal to the touches required.
83 * @param[in] touchesRequired The number of touches required.
84 * @return A handle to a newly allocated Dali resource.
86 static LongPressGestureDetector New(unsigned int touchesRequired);
89 * @brief Create an initialized LongPressGestureDetector with the minimum and maximum number of touches required.
91 * A long press gesture will be emitted from this detector if the number of fingers touching the screen
92 * falls between the minimum and maximum touches set.
93 * @param[in] minTouches The minimum number of touches required.
94 * @param[in] maxTouches The maximum number of touches required.
95 * @return A handle to a newly allocated Dali resource.
97 static LongPressGestureDetector New(unsigned int minTouches, unsigned int maxTouches);
100 * @brief Downcast an Object handle to LongPressGestureDetector handle.
102 * If handle points to a LongPressGestureDetector object the
103 * downcast produces valid handle. If not the returned handle is left uninitialized.
104 * @param[in] handle to An object
105 * @return handle to a LongPressGestureDetector object or an uninitialized handle
107 static LongPressGestureDetector DownCast( BaseHandle handle );
112 * This is non-virtual since derived Handle types must not contain data or virtual methods.
114 ~LongPressGestureDetector();
117 * @brief This copy constructor is required for (smart) pointer semantics.
119 * @param [in] handle A reference to the copied handle
121 LongPressGestureDetector(const LongPressGestureDetector& handle);
124 * @brief This assignment operator is required for (smart) pointer semantics.
126 * @param [in] rhs A reference to the copied handle
127 * @return A reference to this
129 LongPressGestureDetector& operator=(const LongPressGestureDetector& rhs);
134 * @brief Set the number of touches required.
136 * The number of touches corresponds to the number of fingers a user
137 * has on the screen. This sets the minimum and maximum touches to
138 * the input parameter.
140 * @param[in] touches Touches required.
141 * @pre The gesture detector has been initialized.
142 * @note The default is '1'.
144 void SetTouchesRequired(unsigned int touches);
147 * @brief Sets the minimum and maximum touches required.
149 * The number of touches corresponds to the number of fingers a user
152 * @param[in] minTouches Minimum Touches required.
153 * @param[in] maxTouches Maximum Touches required.
154 * @pre The gesture detector has been initialized.
155 * @note The default is '1'.
157 void SetTouchesRequired(unsigned int minTouches, unsigned int maxTouches);
162 * @brief Retrieves the minimum number of touches required.
164 * @return The minimum number of touches required.
165 * @pre The gesture detector has been initialized.
167 unsigned int GetMinimumTouchesRequired() const;
170 * @brief Retrieves the maximum number of touches required.
172 * @return The maximum number of touches required.
173 * @pre The gesture detector has been initialized.
175 unsigned int GetMaximumTouchesRequired() const;
180 * @brief This signal is emitted when the specified long press is detected on the attached actor.
182 * A callback of the following type may be connected:
184 * void YourCallbackName( Actor actor, const LongPressGesture& gesture );
186 * @pre The gesture detector has been initialized.
187 * @return The signal to connect to.
189 DetectedSignalV2& DetectedSignal();
191 public: // Not intended for Application developers
194 * @brief This constructor is used by Dali New() methods.
196 * @param [in] internal A pointer to a newly allocated Dali resource.
198 explicit DALI_INTERNAL LongPressGestureDetector(Internal::LongPressGestureDetector* internal);
204 #endif // __DALI_LONG_PRESS_GESTURE_DETECTOR_H__