1 #ifndef DALI_INTERNAL_ATSPI_ACCESSIBILITY_IMPL_H
2 #define DALI_INTERNAL_ATSPI_ACCESSIBILITY_IMPL_H
5 * Copyright (c) 2021 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/actors/actor.h>
23 #include <dali/public-api/math/rect.h>
24 #include <dali/public-api/object/object-registry.h>
32 #include <unordered_map>
33 #include <unordered_set>
37 #include <dali/devel-api/adaptor-framework/accessibility.h>
38 #include <dali/integration-api/debug.h>
42 namespace Accessibility
44 class DALI_ADAPTOR_API Accessible;
45 class DALI_ADAPTOR_API Text;
46 class DALI_ADAPTOR_API Value;
47 class DALI_ADAPTOR_API Component;
48 class DALI_ADAPTOR_API Collection;
49 class DALI_ADAPTOR_API Action;
52 * @brief Base class for different accessibility bridges
54 * Bridge is resposible for initializing and managing connection on accessibility bus.
55 * Accessibility clients will not get any information about UI without initialized and upraised bridge.
56 * Concrete implementation depends on the accessibility technology available on the platform.
58 * @note This class is singleton.
60 struct DALI_ADAPTOR_API Bridge
62 enum class ForceUpResult
71 virtual ~Bridge() = default;
74 * @brief Get bus name which bridge is initialized on
76 virtual const std::string& GetBusName() const = 0;
79 * @brief Registers top level window
81 * Hierarchy of objects visible for accessibility clients is based on tree-like
82 * structure created from Actors objects. This method allows to connect chosen
83 * object as direct ancestor of application and therefore make it visible for
84 * accessibility clients.
86 virtual void AddTopLevelWindow(Accessible*) = 0;
89 * @brief Removes top level window
91 * Hierarchy of objects visible for accessibility clients is based on tree-like
92 * structure created from Actors objects. This method removes previously added
93 * window from visible accessibility objects.
95 virtual void RemoveTopLevelWindow(Accessible*) = 0;
98 * @brief Adds popup window
100 * Hierarchy of objects visible for accessibility clients is based on tree-like
101 * structure created from Actors objects. This method adds new popup to the tree.
103 virtual void AddPopup(Accessible*) = 0;
106 * @brief Removes popup window
108 * Hierarchy of objects visible for accessibility clients is based on tree-like
109 * structure created from Actors objects. This method removes previously added
112 virtual void RemovePopup(Accessible*) = 0;
115 * @brief Set name of current application which will be visible on accessibility bus
117 virtual void SetApplicationName(std::string) = 0;
120 * @brief Get object being root of accessibility tree
122 * @return handler to accessibility object
124 virtual Accessible* GetApplication() const = 0;
127 * @brief Find an object in accessibility tree
129 * @param[in] s path to object
131 * @return handler to accessibility object
133 virtual Accessible* FindByPath(const std::string& s) const = 0;
136 * @brief Show application on accessibility bus
138 virtual void ApplicationShown() = 0;
141 * @brief Hide application on accessibility bus
143 virtual void ApplicationHidden() = 0;
146 * @brief Initialize accessibility bus
148 virtual void Initialize() = 0;
151 * @brief Terminate accessibility bus
153 virtual void Terminate() = 0;
156 * @brief This method is called, when bridge is being activated.
158 virtual ForceUpResult ForceUp()
162 return ForceUpResult::ALREADY_UP;
164 data = std::make_shared<Data>();
166 return ForceUpResult::JUST_STARTED;
170 * @brief This method is called, when bridge is being deactivated.
172 virtual void ForceDown() = 0;
175 * @brief Check if bridge is activated or not.
176 * @return True if brige is activated.
184 * @brief Emits caret-moved event on at-spi bus.
186 virtual void EmitCaretMoved(Accessible* obj, unsigned int cursorPosition) = 0;
189 * @brief Emits active-descendant-changed event on at-spi bus.
191 virtual void EmitActiveDescendantChanged(Accessible* obj, Accessible* child) = 0;
194 * @brief Emits text-changed event on at-spi bus.
196 virtual void EmitTextChanged(Accessible* obj, TextChangedState state, unsigned int position, unsigned int length, const std::string& content) = 0;
199 * @brief Emits state-changed event on at-spi bus.
201 virtual void EmitStateChanged(Accessible* obj, State state, int val1, int val2 = 0) = 0;
204 * @brief Emits window event on at-spi bus.
206 virtual void Emit(Accessible* obj, WindowEvent we, unsigned int detail1 = 0) = 0;
209 * @brief Emits property-changed event on at-spi bus.
211 virtual void Emit(Accessible* obj, ObjectPropertyChangeEvent event) = 0;
214 * @brief Emits bounds-changed event on at-spi bus.
216 virtual void EmitBoundsChanged(Accessible* obj, Rect<> rect) = 0;
219 * @brief Emits key event on at-spi bus.
221 * Screen-reader might receive this event and reply, that given keycode is consumed. In that case
222 * further processing of the keycode should be ignored.
224 virtual Consumed Emit(KeyEventType type, unsigned int keyCode, const std::string& keyName, unsigned int timeStamp, bool isText) = 0;
227 * @brief Reads given text by screen reader
229 * @param text The text to read
230 * @param discardable If TRUE, reading can be discarded by subsequent reading requests,
231 * if FALSE the reading must finish before next reading request can be started
232 * @param callback the callback function that is called on reading signals emitted
233 * during processing of this reading request.
234 * Callback can be one of the following signals:
235 * ReadingCancelled, ReadingStopped, ReadingSkipped
237 virtual void Say(const std::string& text, bool discardable, std::function<void(std::string)> callback) = 0;
240 * @brief Force accessibility client to pause.
242 virtual void Pause() = 0;
245 * @brief Force accessibility client to resume.
247 virtual void Resume() = 0;
250 * @brief Get screen reader status.
252 virtual bool GetScreenReaderEnabled() = 0;
255 * @brief Get ATSPI status.
257 virtual bool GetIsEnabled() = 0;
260 * @brief Returns instance of bridge singleton object.
262 static Bridge* GetCurrentBridge();
267 std::unordered_set<Accessible*> knownObjects;
269 Bridge* bridge = nullptr;
270 Actor highlightActor, currentlyHighlightedActor;
272 std::shared_ptr<Data> data;
273 friend class Accessible;
276 * @brief Registers accessible object to be known in bridge object
278 * Bridge must known about all currently alive accessible objects, as some requst
279 * might come and object will be identified by number id (it's memory address).
280 * To avoid memory corruption number id is checked against set of known objects.
282 void RegisterOnBridge(Accessible*);
285 * @brief Tells bridge, that given object is considered root (doesn't have any parents).
287 * All root objects will have the same parent - application object. Application object
288 * is controlled by bridge and private.
290 void SetIsOnRootLevel(Accessible*);
294 * @brief Check if ATSPI is activated or not.
295 * @return True if ATSPI is activated.
299 if(Bridge::GetCurrentBridge() == nullptr)
303 if(Bridge::GetCurrentBridge()->GetIsEnabled() == false)
307 return Bridge::GetCurrentBridge()->IsUp();
311 * @brief Basic interface implemented by all accessibility objects
316 virtual ~Accessible();
318 using utf8_t = unsigned char;
321 * @brief Calculaties word boundaries in given utf8 text.
323 * s and length represents source text pointer and it's length respectively. langauge represents
324 * language to use. Word boundaries are returned as non-zero values in table breaks, which
325 * must be of size at least length.
327 void FindWordSeparationsUtf8(const utf8_t* s, size_t length, const char* language, char* breaks);
330 * @brief Calculaties line boundaries in given utf8 text.
332 * s and length represents source text pointer and it's length respectively. langauge represents
333 * language to use. Line boundaries are returned as non-zero values in table breaks, which
334 * must be of size at least length.
336 void FindLineSeparationsUtf8(const utf8_t* s, size_t length, const char* language, char* breaks);
339 * @brief Helper function for emiting active-descendant-changed event
341 void EmitActiveDescendantChanged(Accessible* obj, Accessible* child);
344 * @brief Helper function for emiting state-changed event
346 void EmitStateChanged(State state, int newValue1, int newValue2 = 0);
349 * @brief Helper function for emiting bounds-changed event
351 void EmitBoundsChanged(Rect<> rect);
354 * @brief Emit "showing" event.
355 * The method inform accessibility clients about "showing" state
357 * @param[in] showing flag pointing if object is showing
359 void EmitShowing(bool showing);
362 * @brief Emit "visible" event.
363 * The method inform accessibility clients about "visible" state
365 * @param[in] visible flag pointing if object is visible
367 void EmitVisible(bool visible);
370 * @brief Emit "highlighted" event.
371 * The method inform accessibility clients about "highlighted" state
373 * @param[in] set flag pointing if object is highlighted
375 void EmitHighlighted(bool set);
378 * @brief Emit "focused" event.
379 * The method inform accessibility clients about "focused" state
381 * @param[in] set flag pointing if object is focused
383 void EmitFocused(bool set);
386 * @brief Emit "text inserted" event
388 * @param[in] position caret position
389 * @param[in] length text length
390 * @param[in] content inserted text
392 void EmitTextInserted(unsigned int position, unsigned int length, const std::string& content);
395 * @brief Emit "text deleted" event
397 * @param[in] position caret position
398 * @param[in] length text length
399 * @param[in] content deleted text
401 void EmitTextDeleted(unsigned int position, unsigned int length, const std::string& content);
404 * @brief Emit "caret moved" event
406 * @param[in] cursorPosition new caret position
408 void EmitTextCaretMoved(unsigned int cursorPosition);
411 * @brief Emit "highlighted" event
413 * @param[in] we enumerated window event
414 * @param[in] detail1 additional parameter which interpretation depends on chosen event
416 void Emit(WindowEvent we, unsigned int detail1 = 0);
419 * @brief Emits property-changed event
420 * @param[in] event Property changed event
422 void Emit(ObjectPropertyChangeEvent event);
425 * @brief Get accessibility name
427 * @return string with name
429 virtual std::string GetName() = 0;
432 * @brief Get accessibility description
434 * @return string with description
436 virtual std::string GetDescription() = 0;
441 * @return handler to accessibility object
443 virtual Accessible* GetParent() = 0;
446 * @brief Get count of children
448 * @return unsigned integer value
450 virtual size_t GetChildCount() = 0;
453 * @brief Get collection with all children
455 * @return collection of accessibility objects
457 virtual std::vector<Accessible*> GetChildren();
460 * @brief Get nth child
462 * @return accessibility object
464 virtual Accessible* GetChildAtIndex(size_t index) = 0;
467 * @brief Get index that current object has in its parent's children collection
469 * @return unsigned integer index
471 virtual size_t GetIndexInParent() = 0;
474 * @brief Get accessibility role
476 * @return Role enumeration
478 * @see Dali::Accessibility::Role
480 virtual Role GetRole() = 0;
483 * @brief Get name of accessibility role
485 * @return string with human readable role converted from enumeration
487 * @see Dali::Accessibility::Role
488 * @see Accessibility::Accessible::GetRole
490 virtual std::string GetRoleName();
493 * @brief Get localized name of accessibility role
495 * @return string with human readable role translated according to current
498 * @see Dali::Accessibility::Role
499 * @see Accessibility::Accessible::GetRole
500 * @see Accessibility::Accessible::GetRoleName
502 * @note translation is not supported in this version
504 virtual std::string GetLocalizedRoleName();
507 * @brief Get accessibility states
509 * @return collection of states
511 * @note States class is instatation of ArrayBitset template class
513 * @see Dali::Accessibility::State
514 * @see Dali::Accessibility::ArrayBitset
516 virtual States GetStates() = 0;
519 * @brief Get accessibility attributes
521 * @return map of attributes and their values
523 virtual Attributes GetAttributes() = 0;
526 * @brief Check if this is proxy
528 * @return True if this is proxy
530 virtual bool IsProxy();
533 * @brief Get unique address on accessibility bus
535 * @return class containing address
537 * @see Dali::Accessibility::Address
539 virtual Address GetAddress();
542 * @brief Get accessibility object, which is "default label" for this object
544 virtual Accessible* GetDefaultLabel();
547 * @brief Depute an object to perform provided gesture
549 * @param[in] gestureInfo structure describing the gesture
551 * @return true on success, false otherwise
553 * @see Dali::Accessibility::GestureInfo
555 virtual bool DoGesture(const GestureInfo& gestureInfo) = 0;
558 * @brief Re-emits selected states of an Accessibility Object
560 * @param[in] states chosen states to re-emit
561 * @param[in] doRecursive if true all children of the Accessibility Object will also re-emit the states
563 void NotifyAccessibilityStateChange(Dali::Accessibility::States states, bool doRecursive);
566 * @brief Get information about current object and all relations that connects
567 * it with other accessibility objects
569 * @return iterable collection of Relation objects
571 * @see Dali::Accessibility::Relation
573 virtual std::vector<Relation> GetRelationSet() = 0;
576 * @brief Get all implemented interfaces
578 * @return collection of strings with implemented interfaces
580 std::vector<std::string> GetInterfaces();
583 * @brief Check if object is on root level
585 bool GetIsOnRootLevel() const
587 return isOnRootLevel;
591 * @brief The method registers functor resposible for converting Actor into Accessible
592 * @param functor returning Accessible handle from Actor object
594 static void RegisterControlAccessibilityGetter(std::function<Accessible*(Dali::Actor)> functor);
597 * @brief Acquire Accessible object from Actor object
599 * @param[in] actor Actor object
600 * @param[in] root true, if it's top level object (window)
602 * @return handle to Accessible object
604 static Accessible* Get(Dali::Actor actor, bool root = false);
608 Accessible(const Accessible&) = delete;
609 Accessible(Accessible&&) = delete;
610 Accessible& operator=(const Accessible&) = delete;
611 Accessible& operator=(Accessible&&) = delete;
612 std::shared_ptr<Bridge::Data> GetBridgeData();
615 static Dali::Actor GetHighlightActor();
616 static void SetHighlightActor(Dali::Actor actor);
617 static Dali::Actor GetCurrentlyHighlightedActor();
618 static void SetCurrentlyHighlightedActor(Dali::Actor);
619 static void SetObjectRegistry(ObjectRegistry registry);
624 std::weak_ptr<Bridge::Data> bridgeData;
625 bool isOnRootLevel = false;
629 * @brief Interface enabling to perform provided actions
631 class Action : public virtual Accessible
635 * @brief Get name of action with given index
637 * @param[in] index index of action
639 * @return string with name of action
641 virtual std::string GetActionName(size_t index) = 0;
644 * @brief Get translated name of action with given index
646 * @param[in] index index of action
648 * @return string with name of action translated according to current translation domain
650 * @note translation is not supported in this version
652 virtual std::string GetLocalizedActionName(size_t index) = 0;
655 * @brief Get description of action with given index
657 * @param[in] index index of action
659 * @return string with description of action
661 virtual std::string GetActionDescription(size_t index) = 0;
664 * @brief Get key code binded to action with given index
666 * @param[in] index index of action
668 * @return string with key name
670 virtual std::string GetActionKeyBinding(size_t index) = 0;
673 * @brief Get number of provided actions
675 * @return unsigned integer with number of actions
677 virtual size_t GetActionCount() = 0;
680 * @brief Perform an action with given index
682 * @param index index of action
684 * @return true on success, false otherwise
686 virtual bool DoAction(size_t index) = 0;
689 * @brief Perform an action with given name
691 * @param name name of action
693 * @return true on success, false otherwise
695 virtual bool DoAction(const std::string& name) = 0;
699 * @brief Interface enabling advanced quering of accessibility objects
701 * @note since all mathods can be implemented inside bridge,
702 * none methods have to be overrided
704 class Collection : public virtual Accessible
710 * @brief Interface representing objects having screen coordinates
712 class Component : public virtual Accessible
716 * @brief Get rectangle describing size
718 * @param[in] ctype enumeration with type of coordinate systems
720 * @return Rect<> object
724 virtual Rect<> GetExtents(CoordType ctype) = 0;
727 * @brief Get layer current object is localized on
729 * @return enumeration pointing layer
731 * @see Dali::Accessibility::ComponentLayer
733 virtual ComponentLayer GetLayer() = 0;
736 * @brief Get value of z-order
738 * @return value of z-order
740 virtual int16_t GetMdiZOrder() = 0;
743 * @brief Set current object as "focused"
745 * @return true on success, false otherwise
747 virtual bool GrabFocus() = 0;
750 * @brief Get value of alpha channel
752 * @return alpha channel value in range [0.0, 1.0]
754 virtual double GetAlpha() = 0;
757 * @brief Set current object as "highlighted"
759 * The method assings "highlighted" state, simultaneously removing it
760 * from currently highlighted object.
762 * @return true on success, false otherwise
764 virtual bool GrabHighlight() = 0;
767 * @brief Set current object as "unhighlighted"
769 * The method removes "highlighted" state from object.
771 * @return true on success, false otherwise
773 * @see Dali:Accessibility::State
775 virtual bool ClearHighlight() = 0;
778 * @brief Check whether object can be scrolled
780 * @return true if object is scrollable, false otherwise
782 * @see Dali:Accessibility::State
784 virtual bool IsScrollable();
787 * @brief Get Accessible object containing given point
789 * @param[in] p two-dimensional point
790 * @param[in] ctype enumeration with type of coordinate system
792 * @return handle to last child of current object which contains given point
794 * @see Dali::Accessibility::Point
796 virtual Accessible* GetAccessibleAtPoint(Point p, CoordType ctype);
799 * @brief Check if current object contains given point
801 * @param[in] p two-dimensional point
802 * @param[in] ctype enumeration with type of coordinate system
804 * @return handle to Accessible object
806 * @see Dali::Accessibility::Point
808 virtual bool Contains(Point p, CoordType ctype);
812 * @brief Interface representing objects which can store numeric value
814 class Value : public virtual Accessible
818 * @brief Get the lowest possible value
820 * @return double value
822 virtual double GetMinimum() = 0;
825 * @brief Get current value
827 * @return double value
829 virtual double GetCurrent() = 0;
832 * @brief Get the highest possible value
834 * @return double value
836 virtual double GetMaximum() = 0;
841 * @param[in] val double value
843 * @return true if value could have been assigned, false otherwise
845 virtual bool SetCurrent(double val) = 0;
848 * @brief Get the lowest increment that can be distinguished
850 * @return double value
852 virtual double GetMinimumIncrement() = 0;
856 * @brief Interface representing objects which can store immutable texts
858 * @see Dali::Accessibility::EditableText
860 class DALI_ADAPTOR_API Text : public virtual Accessible
864 * @brief Get stored text in given range
866 * @param[in] startOffset index of first character
867 * @param[in] endOffset index of first character after the last one expected
869 * @return substring of stored text
871 virtual std::string GetText(size_t startOffset, size_t endOffset) = 0;
874 * @brief Get number of all stored characters
876 * @return number of characters
878 virtual size_t GetCharacterCount() = 0;
881 * @brief Get caret offset
883 * @return Value of caret offset
885 virtual size_t GetCaretOffset() = 0;
888 * @brief Set caret offset
890 * @param[in] offset Caret offset
892 * @return True if successful
894 virtual bool SetCaretOffset(size_t offset) = 0;
897 * @brief Get substring of stored text truncated in concrete gradation
899 * @param[in] offset position in stored text
900 * @param[in] boundary enumeration describing text gradation
902 * @return Range structure containing acquired text and offsets in original string
904 * @see Dali::Accessibility::Range
906 virtual Range GetTextAtOffset(size_t offset, TextBoundary boundary) = 0;
909 * @brief Get selected text
911 * @param[in] selectionNum selection index
912 * @note Currently only one selection (i.e. with index = 0) is supported
914 * @return Range structure containing acquired text and offsets in original string
916 * @see Dali::Accessibility::Range
918 virtual Range GetSelection(size_t selectionNum) = 0;
921 * @brief Remove selection
923 * @param[in] selectionNum selection index
924 * @note Currently only one selection (i.e. with index = 0) is supported
926 * @return bool on success, false otherwise
928 virtual bool RemoveSelection(size_t selectionNum) = 0;
931 * @brief Get selected text
933 * @param[in] selectionNum selection index
934 * @param[in] startOffset index of first character
935 * @param[in] endOffset index of first character after the last one expected
937 * @note Currently only one selection (i.e. with index = 0) is supported
939 * @return true on success, false otherwise
941 virtual bool SetSelection(size_t selectionNum, size_t startOffset, size_t endOffset) = 0;
945 * @brief Interface representing objects which can store editable texts
947 * @note Paste method is entirely implemented inside bridge
949 * @see Dali::Accessibility::EditableText
951 class DALI_ADAPTOR_API EditableText : public virtual Accessible
955 * @brief Copy text in range to system clipboard
957 * @param[in] startPosition index of first character
958 * @param[in] endPosition index of first character after the last one expected
960 * @return true on success, false otherwise
962 virtual bool CopyText(size_t startPosition, size_t endPosition) = 0;
965 * @brief Cut text in range to system clipboard
967 * @param[in] startPosition index of first character
968 * @param[in] endPosition index of first character after the last one expected
970 * @return true on success, false otherwise
972 virtual bool CutText(size_t startPosition, size_t endPosition) = 0;
976 * @brief minimalistic, always empty Accessible object with settable address
978 * For those situations, where you want to return address in different bridge
979 * (embedding for example), but the object itself ain't planned to be used otherwise.
980 * This object has null parent, no children, empty name and so on
982 class DALI_ADAPTOR_API EmptyAccessibleWithAddress : public virtual Accessible
985 EmptyAccessibleWithAddress() = default;
986 EmptyAccessibleWithAddress(Address address)
987 : address(std::move(address))
991 void SetAddress(Address address)
993 this->address = std::move(address);
996 std::string GetName() override
1000 std::string GetDescription() override
1004 Accessible* GetParent() override
1008 size_t GetChildCount() override
1012 std::vector<Accessible*> GetChildren() override
1016 Accessible* GetChildAtIndex(size_t index) override
1018 throw std::domain_error{"out of bounds index (" + std::to_string(index) + ") - no children"};
1020 size_t GetIndexInParent() override
1022 return static_cast<size_t>(-1);
1024 Role GetRole() override
1028 std::string GetRoleName() override;
1029 States GetStates() override
1033 Attributes GetAttributes() override
1037 Address GetAddress() override
1041 bool DoGesture(const GestureInfo& gestureInfo) override
1045 std::vector<Relation> GetRelationSet() override
1054 } // namespace Accessibility
1057 #endif // DALI_INTERNAL_ATSPI_ACCESSIBILITY_IMPL_H