1 #ifndef DALI_ACCESSIBILITY_ADAPTOR_H
2 #define DALI_ACCESSIBILITY_ADAPTOR_H
5 * Copyright (c) 2020 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/devel-api/events/touch-point.h>
23 #include <dali/public-api/dali-adaptor-common.h>
24 #include <dali/public-api/object/base-handle.h>
28 namespace Internal DALI_INTERNAL
32 class AccessibilityAdaptor;
34 } // namespace DALI_INTERNAL
36 class AccessibilityActionHandler;
37 class AccessibilityGestureHandler;
41 * @brief The AccessibilityAdaptor provides communication to the accessibility manager interface (implemented in toolkit).
44 class DALI_ADAPTOR_API AccessibilityAdaptor : public BaseHandle
48 * @brief Create an uninitialized handle.
50 * This can be initialized by calling getting the adaptor from Dali::Adaptor.
52 AccessibilityAdaptor();
55 * @brief Retrieve a handle to the AccessibilityAdaptor.
57 * @return A handle to the AccessibilityAdaptor.
59 static AccessibilityAdaptor Get();
64 * This is non-virtual since derived Handle types must not contain data or virtual methods.
66 ~AccessibilityAdaptor();
69 * @brief Returns the current position of the read action.
70 * @return The current event position.
72 Vector2 GetReadPosition() const;
75 * @brief Enables Accessibility action or not.
76 * @param[in] enabled True if Accessibility action should be enabled.
78 void EnableAccessibility( bool enabled );
81 * @brief Query whether the accessibility(screen-reader) is enabled.
83 * The accessibility will be enabled by system setting.
84 * @return True if the accessibility(screen-reader) is enabled.
86 bool IsEnabled() const;
89 * @brief Set the handler to handle accessibility actions.
91 * @param[in] handler The Accessibility action handler.
92 * @note Handlers should remove themselves when they are destroyed.
94 void SetActionHandler(AccessibilityActionHandler& handler);
97 * @brief Set the handler to handle accessibility gestures.
99 * @param[in] handler The Accessibility gesture handler.
100 * @note Handlers should remove themselves when they are destroyed.
102 void SetGestureHandler(AccessibilityGestureHandler& handler);
105 * @brief Handle the accessibility action to move focus to the next focusable actor
106 * (by one finger flick down).
108 * @param allowEndFeedback true if end of list feedback should be played when the focus is alread reached to the end
109 * @return Whether the action is performed successfully or not.
111 bool HandleActionNextEvent(bool allowEndFeedback = true);
114 * @brief Handle the accessibility action to move focus to the previous focusable actor
115 * (by one finger flick up).
117 * @param allowEndFeedback true if end of list feedback should be played when the focus is alread reached to the end
118 * @return Whether the action is performed successfully or not.
120 bool HandleActionPreviousEvent(bool allowEndFeedback = true);
123 * @brief Handle the accessibility action to activate the current focused actor (by one
126 * @return Whether the action is performed successfully or not.
128 bool HandleActionActivateEvent();
131 * @brief Handle the accessibility action to focus and read the actor (by one finger tap or move).
133 * @param x x position of event
134 * @param y y position of event
135 * @param allowReadAgain true if the action read again the same object (i.e. read action)
136 * false if the action just read when the focus object is changed (i.e. over action)
137 * @return Whether the action is performed successfully or not.
139 bool HandleActionReadEvent(unsigned int x, unsigned int y, bool allowReadAgain);
142 * @brief Handle the accessibility action to move focus to the next focusable actor
143 * (by one finger flick right).
145 * @param allowEndFeedback true if end of list feedback should be played when the focus is alread reached to the end
146 * @return Whether the action is performed successfully or not.
148 bool HandleActionReadNextEvent(bool allowEndFeedback = true);
151 * @brief Handle the accessibility action to move focus to the previous focusable actor
152 * (by one finger flick up).
154 * @param allowEndFeedback true if end of list feedback should be played when the focus is alread reached to the front
155 * @return Whether the action is performed successfully or not.
157 bool HandleActionReadPreviousEvent(bool allowEndFeedback = true);
160 * @brief Handle the accessibility action to change the value when the current focused
161 * actor is a slider (by double finger down and move up and right).
163 * @return Whether the action is performed successfully or not.
165 bool HandleActionUpEvent();
168 * @brief Handle the accessibility action to change the value when the current focused
169 * actor is a slider (by double finger down and move down and left).
171 * @return Whether the action is performed successfully or not.
173 bool HandleActionDownEvent();
176 * @brief Handle the accessibility action to clear the focus from the current focused
177 * actor if any, so that no actor is focused in the focus chain.
179 * @return Whether the action is performed successfully or not.
181 bool HandleActionClearFocusEvent();
184 * @brief Handle the accessibility action to scroll when there is a scroller on the touched position
185 * (by 2 finger touch & move, 2 finger flick).
187 * @param[in] point The touch point information.
188 * @param[in] timeStamp The time the touch occurred.
189 * @return Whether the action is performed successfully or not.
191 bool HandleActionScrollEvent(const TouchPoint& point, unsigned long timeStamp);
194 * @brief Handle the accessibility action to navigate back (by two fingers circle draw).
195 * @return Whether the action is performed successfully or not.
197 bool HandleActionBackEvent();
200 * @brief Handle the accessibility action to enable the feature.
202 void HandleActionEnableEvent();
205 * @brief Handle the accessibility action to disable the feature.
207 void HandleActionDisableEvent();
210 * @brief Handle the accessibility action to scroll up the list and focus on
211 * the first item on the list after the scrolling and read the item
212 * (by two finger swipe up).
214 * @return Whether the action is performed successfully or not.
216 bool HandleActionScrollUpEvent();
219 * @brief Handle the accessibility action to scroll down the list and focus on
220 * the first item on the list after the scrolling and read the item
221 * (by two finger swipe down).
223 * @return Whether the action is performed successfully or not.
225 bool HandleActionScrollDownEvent();
228 * @brief Handle the accessibility action to scroll left to the previous page
229 * (by two finger swipe left).
231 * @return Whether the action is performed successfully or not.
233 bool HandleActionPageLeftEvent();
236 * @brief Handle the accessibility action to scroll right to the next page
237 * (by two finger swipe right).
239 * @return Whether the action is performed successfully or not.
241 bool HandleActionPageRightEvent();
244 * @brief Handle the accessibility action to scroll up to the previous page
245 * (by one finger swipe left and right).
247 * @return Whether the action is performed successfully or not.
249 bool HandleActionPageUpEvent();
252 * @brief Handle the accessibility action to scroll down to the next page
253 * (by one finger swipe right and left).
255 * @return Whether the action is performed successfully or not.
257 bool HandleActionPageDownEvent();
260 * @brief Handle the accessibility action to move the focus to the first item on the screen
261 * (by one finger swipe up and down).
263 * @return Whether the action is performed successfully or not.
265 bool HandleActionMoveToFirstEvent();
268 * @brief Handle the accessibility action to move the focus to the last item on the screen
269 * (by one finger swipe down and up).
271 * @return Whether the action is performed successfully or not.
273 bool HandleActionMoveToLastEvent();
276 * @brief Handle the accessibility action to move the focus to the first item on the top
277 * and read from the top item continuously (by three fingers single tap).
279 * @return Whether the action is performed successfully or not.
281 bool HandleActionReadFromTopEvent();
284 * @brief Handle the accessibility action to move focus to and read from the next focusable
285 * actor continuously (by three fingers double tap).
287 * @return Whether the action is performed successfully or not.
289 bool HandleActionReadFromNextEvent();
292 * @brief Handle the accessibility action to do the zooming
293 * (by one finger triple tap).
295 * @return Whether the action is performed successfully or not.
297 bool HandleActionZoomEvent();
300 * @brief Handle the accessibility action to pause/resume the current speech
301 * (by two fingers single tap).
303 * @return Whether the action is performed successfully or not.
305 bool HandleActionReadPauseResumeEvent();
308 * @brief Handle the accessibility action to start/stop the current action
309 * (by two fingers double tap).
311 * @return Whether the action is performed successfully or not.
313 bool HandleActionStartStopEvent();
315 public: // Not intended for application developers
317 * @brief Creates a handle using the Adaptor::Internal implementation.
319 * @param[in] adaptor The AccessibilityAdaptor implementation.
321 DALI_INTERNAL AccessibilityAdaptor(Internal::Adaptor::AccessibilityAdaptor& adaptor);
324 * @brief This constructor is used by AccessibilityAdaptor::Get().
326 * @param[in] adaptor A pointer to the accessibility adaptor.
328 explicit DALI_INTERNAL AccessibilityAdaptor(Internal::Adaptor::AccessibilityAdaptor* adaptor);
333 #endif // DALI_ACCESSIBILITY_ADAPTOR_H