dali/internal/accessibility/bridge/bridge-base.cpp

   1 /*
   2  * Copyright (c) 2021 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include <dali/internal/accessibility/bridge/bridge-base.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/devel-api/common/stage.h>
  23 #include <atomic>
  24 #include <cstdlib>
  25 #include <memory>
  26
  27 // INTERNAL INCLUDES
  28 #include <dali/public-api/adaptor-framework/timer.h>
  29
  30 using namespace Dali::Accessibility;
  31
  32 static Dali::Timer tickTimer;
  33
  34 BridgeBase::BridgeBase()
  35 {
  36 }
  37
  38 BridgeBase::~BridgeBase()
  39 {
  40   mApplication.mChildren.clear();
  41   mApplication.mWindows.clear();
  42 }
  43
  44 void BridgeBase::AddFilteredEvent(FilteredEvents kind, Dali::Accessibility::Accessible* obj, float delay, std::function<void()> functor)
  45 {
  46   if(delay < 0)
  47   {
  48     delay = 0;
  49   }
  50
  51   auto it = mFilteredEvents.insert({{kind, obj}, {static_cast<unsigned int>(delay * 10), {}}});
  52   if(it.second)
  53   {
  54     functor();
  55   }
  56   else
  57   {
  58     it.first->second.second = std::move(functor);
  59   }
  60
  61   if(!tickTimer)
  62   {
  63     tickTimer = Dali::Timer::New(100);
  64     tickTimer.TickSignal().Connect(this, &BridgeBase::TickFilteredEvents);
  65   }
  66 }
  67
  68 bool BridgeBase::TickFilteredEvents()
  69 {
  70   for(auto it = mFilteredEvents.begin(); it != mFilteredEvents.end();)
  71   {
  72     if(it->second.first)
  73     {
  74       --it->second.first;
  75     }
  76     else
  77     {
  78       if(it->second.second)
  79       {
  80         it->second.second();
  81         it->second.second = {};
  82       }
  83       else
  84       {
  85         it = mFilteredEvents.erase(it);
  86         continue;
  87       }
  88     }
  89     ++it;
  90   }
  91   return !mFilteredEvents.empty();
  92 }
  93
  94 void BridgeBase::UpdateRegisteredEvents()
  95 {
  96   using ReturnType = std::vector<std::tuple<std::string, std::string>>;
  97   mRegistry.method<DBus::ValueOrError<ReturnType>()>("GetRegisteredEvents").asyncCall([this](DBus::ValueOrError<ReturnType> msg) {
  98     if(!msg)
  99     {
 100       LOG() << "Get registered events failed";
 101       return;
 102     }
 103
 104     IsBoundsChangedEventAllowed = false;
 105
 106     ReturnType values = std::get<ReturnType>(msg.getValues());
 107     for(long unsigned int i = 0; i < values.size(); i++)
 108     {
 109       if(!std::get<1>(values[i]).compare("Object:BoundsChanged"))
 110       {
 111         IsBoundsChangedEventAllowed = true;
 112       }
 113     }
 114   });
 115 }
 116
 117 BridgeBase::ForceUpResult BridgeBase::ForceUp()
 118 {
 119   if(Bridge::ForceUp() == ForceUpResult::ALREADY_UP)
 120   {
 121     return ForceUpResult::ALREADY_UP;
 122   }
 123   auto proxy = DBus::DBusClient{dbusLocators::atspi::BUS, dbusLocators::atspi::OBJ_PATH, dbusLocators::atspi::BUS_INTERFACE, DBus::ConnectionType::SESSION};
 124   auto addr  = proxy.method<std::string()>(dbusLocators::atspi::GET_ADDRESS).call();
 125
 126   if(!addr)
 127   {
 128     throw std::domain_error{std::string("failed at call '") + dbusLocators::atspi::GET_ADDRESS + "': " + addr.getError().message};
 129   }
 130
 131   mConnectionPtr  = DBusWrapper::Installed()->eldbus_address_connection_get_impl(std::get<0>(addr));
 132   mData->mBusName = DBus::getConnectionName(mConnectionPtr);
 133   mDbusServer     = {mConnectionPtr};
 134
 135   {
 136     DBus::DBusInterfaceDescription desc{AtspiDbusInterfaceCache};
 137     AddFunctionToInterface(desc, "GetItems", &BridgeBase::GetItems);
 138     mDbusServer.addInterface(AtspiDbusPathCache, desc);
 139   }
 140   {
 141     DBus::DBusInterfaceDescription desc{AtspiDbusInterfaceApplication};
 142     AddGetSetPropertyToInterface(desc, "Id", &BridgeBase::GetId, &BridgeBase::SetId);
 143     mDbusServer.addInterface(AtspiPath, desc);
 144   }
 145
 146   mRegistry = {AtspiDbusNameRegistry, AtspiDbusPathRegistry, AtspiDbusInterfaceRegistry, mConnectionPtr};
 147
 148   UpdateRegisteredEvents();
 149
 150   mRegistry.addSignal<void(void)>("EventListenerRegistered", [this](void) {
 151     UpdateRegisteredEvents();
 152   });
 153
 154   mRegistry.addSignal<void(void)>("EventListenerDeregistered", [this](void) {
 155     UpdateRegisteredEvents();
 156   });
 157
 158   return ForceUpResult::JUST_STARTED;
 159 }
 160
 161 void BridgeBase::ForceDown()
 162 {
 163   Bridge::ForceDown();
 164   mRegistry      = {};
 165   mDbusServer    = {};
 166   mConnectionPtr = {};
 167 }
 168
 169 const std::string& BridgeBase::GetBusName() const
 170 {
 171   static std::string empty;
 172   return mData ? mData->mBusName : empty;
 173 }
 174
 175 Accessible* BridgeBase::FindByPath(const std::string& name) const
 176 {
 177   try
 178   {
 179     return Find(name);
 180   }
 181   catch(std::domain_error&)
 182   {
 183     return nullptr;
 184   }
 185 }
 186
 187 void BridgeBase::AddPopup(Accessible* object)
 188 {
 189   if(std::find(mPopups.begin(), mPopups.end(), object) != mPopups.end())
 190   {
 191     return;
 192   }
 193   mPopups.push_back(object);
 194   if(IsUp())
 195   {
 196     object->Emit(WindowEvent::ACTIVATE, 0);
 197   }
 198 }
 199
 200 void BridgeBase::RemovePopup(Accessible* object)
 201 {
 202   auto it = std::find(mPopups.begin(), mPopups.end(), object);
 203   if(it == mPopups.end())
 204   {
 205     return;
 206   }
 207   mPopups.erase(it);
 208
 209   if(IsUp())
 210   {
 211     object->Emit(WindowEvent::DEACTIVATE, 0);
 212     if(mPopups.empty())
 213     {
 214       mApplication.mChildren.back()->Emit(WindowEvent::ACTIVATE, 0);
 215     }
 216     else
 217     {
 218       mPopups.back()->Emit(WindowEvent::ACTIVATE, 0);
 219     }
 220   }
 221 }
 222
 223 void BridgeBase::OnWindowVisibilityChanged(Dali::Window window, bool visible)
 224 {
 225   if(visible)
 226   {
 227     // TODO : Should we check 'out of screen' here? -> Then, we need an actor of this change.
 228     Dali::Accessibility::Bridge::GetCurrentBridge()->WindowShown(window); // Called when Window is shown.
 229   }
 230   else
 231   {
 232     Dali::Accessibility::Bridge::GetCurrentBridge()->WindowHidden(window); // Called when Window is hidden and iconified.
 233   }
 234
 235 }
 236
 237 void BridgeBase::OnWindowFocusChanged(Dali::Window window, bool focusIn)
 238 {
 239   if(focusIn)
 240   {
 241     Dali::Accessibility::Bridge::GetCurrentBridge()->WindowFocused(window); // Called when Window is focused.
 242   }
 243   else
 244   {
 245     Dali::Accessibility::Bridge::GetCurrentBridge()->WindowUnfocused(window); // Called when Window is out of focus.
 246   }
 247 }
 248
 249 void BridgeBase::AddTopLevelWindow(Accessible* windowAccessible)
 250 {
 251   if(windowAccessible->GetInternalActor() == nullptr)
 252   {
 253     return;
 254   }
 255
 256   // Prevent adding the default window twice.
 257   if(!mApplication.mChildren.empty() &&
 258      mApplication.mChildren[0]->GetInternalActor() == windowAccessible->GetInternalActor())
 259   {
 260     return;
 261   }
 262
 263   // Adds Window to a list of Windows.
 264   mApplication.mChildren.push_back(windowAccessible);
 265   SetIsOnRootLevel(windowAccessible);
 266
 267   Dali::Window window = Dali::DevelWindow::Get(windowAccessible->GetInternalActor());
 268   if(window)
 269   {
 270     mApplication.mWindows.push_back(window);
 271     Dali::DevelWindow::VisibilityChangedSignal(window).Connect(this, &BridgeBase::OnWindowVisibilityChanged);
 272     window.FocusChangeSignal().Connect(this, &BridgeBase::OnWindowFocusChanged);
 273   }
 274 }
 275
 276 void BridgeBase::RemoveTopLevelWindow(Accessible* windowAccessible)
 277 {
 278   for(auto i = 0u; i < mApplication.mWindows.size(); ++i)
 279   {
 280     if(windowAccessible->GetInternalActor() == mApplication.mWindows[i].GetRootLayer())
 281     {
 282       Dali::DevelWindow::VisibilityChangedSignal(mApplication.mWindows[i]).Disconnect(this, &BridgeBase::OnWindowVisibilityChanged);
 283       mApplication.mWindows[i].FocusChangeSignal().Disconnect(this, &BridgeBase::OnWindowFocusChanged);
 284       mApplication.mWindows.erase(mApplication.mWindows.begin() + i);
 285       break;
 286     }
 287   }
 288
 289   for(auto i = 0u; i < mApplication.mChildren.size(); ++i)
 290   {
 291     if(mApplication.mChildren[i] == windowAccessible)
 292     {
 293       mApplication.mChildren.erase(mApplication.mChildren.begin() + i);
 294       break;
 295     }
 296   }
 297 }
 298
 299 std::string BridgeBase::StripPrefix(const std::string& path)
 300 {
 301   auto size = strlen(AtspiPath);
 302   return path.substr(size + 1);
 303 }
 304
 305 Accessible* BridgeBase::Find(const std::string& path) const
 306 {
 307   if(path == "root")
 308   {
 309     return &mApplication;
 310   }
 311
 312   void* accessible;
 313   std::istringstream tmp{path};
 314   if(!(tmp >> accessible))
 315   {
 316     throw std::domain_error{"invalid path '" + path + "'"};
 317   }
 318
 319   auto it = mData->mKnownObjects.find(static_cast<Accessible*>(accessible));
 320   if(it == mData->mKnownObjects.end())
 321   {
 322     throw std::domain_error{"unknown object '" + path + "'"};
 323   }
 324
 325   return static_cast<Accessible*>(accessible);
 326 }
 327
 328 Accessible* BridgeBase::Find(const Address& ptr) const
 329 {
 330   assert(ptr.GetBus() == mData->mBusName);
 331   return Find(ptr.GetPath());
 332 }
 333
 334 Accessible* BridgeBase::FindSelf() const
 335 {
 336   auto path  = DBus::DBusServer::getCurrentObjectPath();
 337   auto size = strlen(AtspiPath);
 338   if(path.size() <= size)
 339   {
 340     throw std::domain_error{"invalid path '" + path + "'"};
 341   }
 342   if(path.substr(0, size) != AtspiPath)
 343   {
 344     throw std::domain_error{"invalid path '" + path + "'"};
 345   }
 346   if(path[size] != '/')
 347   {
 348     throw std::domain_error{"invalid path '" + path + "'"};
 349   }
 350   return Find(StripPrefix(path));
 351 }
 352
 353 void BridgeBase::SetId(int id)
 354 {
 355   this->mId = id;
 356 }
 357
 358 int BridgeBase::GetId()
 359 {
 360   return this->mId;
 361 }
 362
 363 auto BridgeBase::GetItems() -> DBus::ValueOrError<std::vector<CacheElementType>>
 364 {
 365   auto root = &mApplication;
 366
 367   std::vector<CacheElementType> res;
 368
 369   std::function<void(Accessible*)> proc =
 370     [&](Accessible* item) {
 371       res.emplace_back(std::move(CreateCacheElement(root)));
 372       for(auto i = 0u; i < item->GetChildCount(); ++i)
 373       {
 374         proc(item->GetChildAtIndex(i));
 375       }
 376     };
 377
 378   return res;
 379 }
 380
 381 auto BridgeBase::CreateCacheElement(Accessible* item) -> CacheElementType
 382 {
 383   if(!item)
 384   {
 385     return {};
 386   }
 387
 388   auto root   = &mApplication;
 389   auto parent = item->GetParent();
 390
 391   std::vector<Address> children;
 392   for(auto i = 0u; i < item->GetChildCount(); ++i)
 393   {
 394     children.emplace_back(item->GetChildAtIndex(i)->GetAddress());
 395   }
 396
 397   return std::make_tuple(
 398     item->GetAddress(),
 399     root->GetAddress(),
 400     parent ? parent->GetAddress() : Address{},
 401     children,
 402     item->GetInterfaces(),
 403     item->GetName(),
 404     item->GetRole(),
 405     item->GetDescription(),
 406     item->GetStates().GetRawData());
 407 }