1 #ifndef DALI_INTERNAL_ACCESSIBILITY_BRIDGE_BASE_H
2 #define DALI_INTERNAL_ACCESSIBILITY_BRIDGE_BASE_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/layer.h>
23 #include <dali/public-api/dali-adaptor-version.h>
24 #include <dali/public-api/object/weak-handle.h>
25 #include <dali/public-api/signals/connection-tracker.h>
30 #include <dali/devel-api/adaptor-framework/proxy-accessible.h>
31 #include <dali/devel-api/adaptor-framework/window-devel.h>
32 #include <dali/devel-api/atspi-interfaces/accessible.h>
33 #include <dali/devel-api/atspi-interfaces/application.h>
34 #include <dali/devel-api/atspi-interfaces/collection.h>
35 #include <dali/devel-api/atspi-interfaces/socket.h>
36 #include <dali/internal/accessibility/bridge/accessibility-common.h>
39 * @brief The ApplicationAccessible class is to define Accessibility Application.
41 class ApplicationAccessible : public virtual Dali::Accessibility::Accessible,
42 public virtual Dali::Accessibility::Application,
43 public virtual Dali::Accessibility::Collection,
44 public virtual Dali::Accessibility::Component,
45 public virtual Dali::Accessibility::Socket
48 Dali::Accessibility::ProxyAccessible mParent;
49 std::vector<Dali::Accessibility::Accessible*> mChildren;
51 std::string mToolkitName{"dali"};
52 bool mIsEmbedded{false};
54 std::string GetName() const override
59 std::string GetDescription() const override
64 Dali::Accessibility::Accessible* GetParent() override
69 size_t GetChildCount() const override
71 return mChildren.size();
74 std::vector<Dali::Accessibility::Accessible*> GetChildren() override
79 Dali::Accessibility::Accessible* GetChildAtIndex(size_t index) override
81 auto size = mChildren.size();
84 throw std::domain_error{"invalid index " + std::to_string(index) + " for object with " + std::to_string(size) + " children"};
86 return mChildren[index];
89 size_t GetIndexInParent() override
96 throw std::domain_error{"can't call GetIndexInParent on application object"};
99 Dali::Accessibility::Role GetRole() const override
101 return Dali::Accessibility::Role::APPLICATION;
104 Dali::Accessibility::States GetStates() override
106 Dali::Accessibility::States result;
108 for(auto* child : mChildren)
110 result = result | child->GetStates();
113 // The Application object should never have the SENSITIVE state
114 result[Dali::Accessibility::State::SENSITIVE] = false;
119 Dali::Accessibility::Attributes GetAttributes() const override
125 * @brief Gets the Accessible object from the window.
127 * @param[in] window The window to find
128 * @return Null if mChildren is empty, otherwise the Accessible object
129 * @note Currently, the default window would be returned when mChildren is not empty.
131 Dali::Accessibility::Accessible* GetWindowAccessible(Dali::Window window)
133 if(mChildren.empty())
138 Dali::Layer rootLayer = window.GetRootLayer();
140 // Find a child which is related to the window.
141 for(auto i = 0u; i < mChildren.size(); ++i)
143 if(rootLayer == mChildren[i]->GetInternalActor())
149 // If can't find its children, return the default window.
153 bool DoGesture(const Dali::Accessibility::GestureInfo& gestureInfo) override
158 std::vector<Dali::Accessibility::Relation> GetRelationSet() override
163 Dali::Actor GetInternalActor() override
165 return Dali::Actor{};
168 Dali::Accessibility::Address GetAddress() const override
175 std::string GetToolkitName() const override
180 std::string GetVersion() const override
182 return std::to_string(Dali::ADAPTOR_MAJOR_VERSION) + "." + std::to_string(Dali::ADAPTOR_MINOR_VERSION);
187 Dali::Accessibility::Address Embed(Dali::Accessibility::Address plug) override
190 mParent.SetAddress(plug);
195 void Unembed(Dali::Accessibility::Address plug) override
197 if(mParent.GetAddress() == plug)
200 mParent.SetAddress({});
201 Dali::Accessibility::Bridge::GetCurrentBridge()->SetExtentsOffset(0, 0);
205 void SetOffset(std::int32_t x, std::int32_t y) override
212 Dali::Accessibility::Bridge::GetCurrentBridge()->SetExtentsOffset(x, y);
217 Dali::Rect<> GetExtents(Dali::Accessibility::CoordinateType type) const override
219 using limits = std::numeric_limits<float>;
221 float minX = limits::max();
222 float minY = limits::max();
223 float maxX = limits::min();
224 float maxY = limits::min();
226 for(Dali::Accessibility::Accessible* child : mChildren)
228 auto* component = Dali::Accessibility::Component::DownCast(child);
234 auto extents = component->GetExtents(type);
236 minX = std::min(minX, extents.x);
237 minY = std::min(minY, extents.y);
238 maxX = std::max(maxX, extents.x + extents.width);
239 maxY = std::max(maxY, extents.y + extents.height);
242 return {minX, minY, maxX - minX, maxY - minY};
245 Dali::Accessibility::ComponentLayer GetLayer() const override
247 return Dali::Accessibility::ComponentLayer::WINDOW;
250 std::int16_t GetMdiZOrder() const override
255 bool GrabFocus() override
260 double GetAlpha() const override
265 bool GrabHighlight() override
270 bool ClearHighlight() override
275 bool IsScrollable() const override
282 * @brief Enumeration for CoalescableMessages.
284 enum class CoalescableMessages
286 BOUNDS_CHANGED, ///< Bounds changed
287 SET_OFFSET, ///< Set offset
288 POST_RENDER, ///< Post render
289 STATE_CHANGED_BEGIN = 500, ///< State changed (begin of reserved range)
290 STATE_CHANGED_END = 599, ///< State changed (end of reserved range)
291 // <- any enum value declared here will have the value 600
294 // Custom specialization of std::hash
298 struct hash<std::pair<CoalescableMessages, Dali::Accessibility::Accessible*>>
300 size_t operator()(std::pair<CoalescableMessages, Dali::Accessibility::Accessible*> value) const
302 return (static_cast<size_t>(value.first) * 131) ^ reinterpret_cast<size_t>(value.second);
308 * @brief The BridgeBase class is basic class for Bridge functions.
310 class BridgeBase : public Dali::Accessibility::Bridge, public Dali::ConnectionTracker
312 std::unordered_map<std::pair<CoalescableMessages, Dali::Accessibility::Accessible*>, std::tuple<unsigned int, unsigned int, std::function<void()>>> mCoalescableMessages;
315 * @brief Removes all CoalescableMessages using Tick signal.
317 * @return False if mCoalescableMessages is empty, otherwise true.
319 bool TickCoalescableMessages();
323 * @brief Adds CoalescableMessages, Accessible, and delay time to mCoalescableMessages.
325 * @param[in] kind CoalescableMessages enum value
326 * @param[in] obj Accessible object
327 * @param[in] delay The delay time
328 * @param[in] functor The function to be called // NEED TO UPDATE!
330 void AddCoalescableMessage(CoalescableMessages kind, Dali::Accessibility::Accessible* obj, float delay, std::function<void()> functor);
333 * @brief Callback when the visibility of the window is changed.
335 * @param[in] window The window to be changed
336 * @param[in] visible The visibility of the window
338 void OnWindowVisibilityChanged(Dali::Window window, bool visible);
341 * @brief Callback when the window focus is changed.
343 * @param[in] window The window whose focus is changed
344 * @param[in] focusIn Whether the focus is in/out
346 void OnWindowFocusChanged(Dali::Window window, bool focusIn);
349 * @copydoc Dali::Accessibility::Bridge::GetBusName()
351 const std::string& GetBusName() const override;
354 * @copydoc Dali::Accessibility::Bridge::AddTopLevelWindow()
356 void AddTopLevelWindow(Dali::Accessibility::Accessible* windowAccessible) override;
359 * @copydoc Dali::Accessibility::Bridge::RemoveTopLevelWindow()
361 void RemoveTopLevelWindow(Dali::Accessibility::Accessible* windowAccessible) override;
364 * @copydoc Dali::Accessibility::Bridge::RegisterDefaultLabel()
366 void RegisterDefaultLabel(Dali::Accessibility::Accessible* object) override;
369 * @copydoc Dali::Accessibility::Bridge::UnregisterDefaultLabel()
371 void UnregisterDefaultLabel(Dali::Accessibility::Accessible* object) override;
374 * @copydoc Dali::Accessibility::Bridge::GetDefaultLabel()
376 Dali::Accessibility::Accessible* GetDefaultLabel(Dali::Accessibility::Accessible* root) const override;
379 * @copydoc Dali::Accessibility::Bridge::GetApplication()
381 Dali::Accessibility::Accessible* GetApplication() const override
383 return &mApplication;
387 * @brief Adds function to dbus interface.
389 template<typename SELF, typename... RET, typename... ARGS>
390 void AddFunctionToInterface(
391 DBus::DBusInterfaceDescription& desc, const std::string& funcName, DBus::ValueOrError<RET...> (SELF::*funcPtr)(ARGS...))
393 if(auto self = dynamic_cast<SELF*>(this))
394 desc.addMethod<DBus::ValueOrError<RET...>(ARGS...)>(
396 [=](ARGS... args) -> DBus::ValueOrError<RET...> {
399 return (self->*funcPtr)(std::move(args)...);
401 catch(std::domain_error& e)
403 return DBus::Error{e.what()};
409 * @brief Adds 'Get' property to dbus interface.
411 template<typename T, typename SELF>
412 void AddGetPropertyToInterface(DBus::DBusInterfaceDescription& desc,
413 const std::string& funcName,
414 T (SELF::*funcPtr)())
416 if(auto self = dynamic_cast<SELF*>(this))
417 desc.addProperty<T>(funcName,
418 [=]() -> DBus::ValueOrError<T> {
421 return (self->*funcPtr)();
423 catch(std::domain_error& e)
425 return DBus::Error{e.what()};
432 * @brief Adds 'Set' property to dbus interface.
434 template<typename T, typename SELF>
435 void AddSetPropertyToInterface(DBus::DBusInterfaceDescription& desc,
436 const std::string& funcName,
437 void (SELF::*funcPtr)(T))
439 if(auto self = dynamic_cast<SELF*>(this))
440 desc.addProperty<T>(funcName, {}, [=](T t) -> DBus::ValueOrError<void> {
443 (self->*funcPtr)(std::move(t));
446 catch(std::domain_error& e)
448 return DBus::Error{e.what()};
454 * @brief Adds 'Set' and 'Get' properties to dbus interface.
456 template<typename T, typename T1, typename SELF>
457 void AddGetSetPropertyToInterface(DBus::DBusInterfaceDescription& desc,
458 const std::string& funcName,
459 T1 (SELF::*funcPtrGet)(),
460 DBus::ValueOrError<void> (SELF::*funcPtrSet)(T))
462 if(auto self = dynamic_cast<SELF*>(this))
465 [=]() -> DBus::ValueOrError<T> {
468 return (self->*funcPtrGet)();
470 catch(std::domain_error& e)
472 return DBus::Error{e.what()};
475 [=](T t) -> DBus::ValueOrError<void> {
478 (self->*funcPtrSet)(std::move(t));
481 catch(std::domain_error& e)
483 return DBus::Error{e.what()};
489 * @brief Adds 'Get' and 'Set' properties to dbus interface.
491 template<typename T, typename T1, typename SELF>
492 void AddGetSetPropertyToInterface(DBus::DBusInterfaceDescription& desc,
493 const std::string& funcName,
494 T1 (SELF::*funcPtrGet)(),
495 void (SELF::*funcPtrSet)(T))
497 if(auto self = dynamic_cast<SELF*>(this))
500 [=]() -> DBus::ValueOrError<T> {
503 return (self->*funcPtrGet)();
505 catch(std::domain_error& e)
507 return DBus::Error{e.what()};
510 [=](T t) -> DBus::ValueOrError<void> {
513 (self->*funcPtrSet)(std::move(t));
516 catch(std::domain_error& e)
518 return DBus::Error{e.what()};
524 * @brief Gets the string of the path excluding the specified prefix.
526 * @param path The path to get
527 * @return The string stripped of the specific prefix
529 static std::string StripPrefix(const std::string& path);
532 * @brief Finds the Accessible object according to the path.
534 * @param[in] path The path for Accessible object
535 * @return The Accessible object corresponding to the path
537 Dali::Accessibility::Accessible* Find(const std::string& path) const;
540 * @brief Finds the Accessible object with the given address.
542 * @param[in] ptr The unique Address of the object
543 * @return The Accessible object corresponding to the path
545 Dali::Accessibility::Accessible* Find(const Dali::Accessibility::Address& ptr) const;
548 * @brief Returns the target object of the currently executed DBus method call.
550 * @return The Accessible object
551 * @note When a DBus method is called on some object, this target object (`currentObject`) is temporarily saved by the bridge,
552 * because DBus handles the invocation target separately from the method arguments.
553 * We then use the saved object inside the 'glue' method (e.g. BridgeValue::GetMinimum)
554 * to call the equivalent method on the respective C++ object (this could be ScrollBar::AccessibleImpl::GetMinimum in the example given).
556 Dali::Accessibility::Accessible* FindCurrentObject() const;
559 * @brief Returns the target object of the currently executed DBus method call.
561 * This method tries to downcast the return value of FindCurrentObject() to the requested type,
562 * issuing an error reply to the DBus caller if the requested type is not implemented. Whether
563 * a given type is implemented is decided based on the return value of Accessible::GetInterfaces()
564 * for the current object.
566 * @tparam I The requested AT-SPI interface
567 * @return The Accessible object (cast to a more derived type)
569 * @see FindCurrentObject()
570 * @see Dali::Accessibility::AtspiInterface
571 * @see Dali::Accessibility::AtspiInterfaceType
572 * @see Dali::Accessibility::Accessible::GetInterfaces()
574 template<Dali::Accessibility::AtspiInterface I>
575 auto* FindCurrentObjectWithInterface() const
577 using Type = Dali::Accessibility::AtspiInterfaceType<I>;
580 auto* currentObject = FindCurrentObject();
581 DALI_ASSERT_DEBUG(currentObject); // FindCurrentObject() throws domain_error
583 if(!(result = Dali::Accessibility::Accessible::DownCast<I>(currentObject)))
587 s << "Object " << currentObject->GetAddress().ToString();
588 s << " does not implement ";
589 s << Dali::Accessibility::Accessible::GetInterfaceName(I);
591 throw std::domain_error{s.str()};
598 * @copydoc Dali::Accessibility::Bridge::FindByPath()
600 Dali::Accessibility::Accessible* FindByPath(const std::string& name) const override;
603 * @copydoc Dali::Accessibility::Bridge::SetApplicationName()
605 void SetApplicationName(std::string name) override
607 mApplication.mName = std::move(name);
611 * @copydoc Dali::Accessibility::Bridge::SetToolkitName()
613 void SetToolkitName(std::string_view toolkitName) override
615 mApplication.mToolkitName = std::string{toolkitName};
619 // We use a weak handle in order not to keep a window alive forever if someone forgets to UnregisterDefaultLabel()
620 using DefaultLabelType = std::pair<Dali::WeakHandle<Dali::Window>, Dali::Accessibility::Accessible*>;
621 using DefaultLabelsType = std::list<DefaultLabelType>;
623 mutable ApplicationAccessible mApplication;
624 DefaultLabelsType mDefaultLabels;
625 bool mIsScreenReaderSuppressed = false;
630 * @param[in] id An ID (integer value)
635 * @brief Gets the ID.
636 * @return The ID to be set
641 * @brief Update registered events.
643 void UpdateRegisteredEvents();
645 using CacheElementType = std::tuple<
646 Dali::Accessibility::Address,
647 Dali::Accessibility::Address,
648 Dali::Accessibility::Address,
649 std::vector<Dali::Accessibility::Address>,
650 std::vector<std::string>,
652 Dali::Accessibility::Role,
654 std::array<uint32_t, 2>>;
657 * @brief Gets Items // NEED TO UPDATE!
661 DBus::ValueOrError<std::vector<CacheElementType>> GetItems();
664 * @brief Creates CacheElement.
666 * CreateCacheElement method works for GetItems which is a part of ATSPI protocol.
667 * ATSPI client library (libatspi from at-spi2-core) depending on cacheing policy configuration uses GetItems
668 * to pre-load entire accessible tree from application to its own cache in single dbus call.
669 * Otherwise the particular nodes in a tree are cached lazily when client library tries to access them.
670 * @param item Accessible to get information
671 * @return The elements to be cached
673 CacheElementType CreateCacheElement(Dali::Accessibility::Accessible* item);
676 * @brief Removes expired elements from the default label collection.
678 void CompressDefaultLabels();
681 * @brief Gets the window to which this accessible belongs (or an empty handle).
683 * @param accessible The accessible
686 static Dali::WeakHandle<Dali::Window> GetWindow(Dali::Accessibility::Accessible* accessible);
690 virtual ~BridgeBase();
693 * @copydoc Dali::Accessibility::Bridge::ForceUp()
695 ForceUpResult ForceUp() override;
698 * @copydoc Dali::Accessibility::Bridge::ForceDown()
700 void ForceDown() override;
702 DBus::DBusServer mDbusServer;
703 DBusWrapper::ConnectionPtr mConnectionPtr;
705 DBus::DBusClient mRegistry;
706 bool IsBoundsChangedEventAllowed{false};
709 #endif // DALI_INTERNAL_ACCESSIBILITY_BRIDGE_BASE_H