dali-toolkit/internal/focus-manager/keyboard-focus-manager-impl.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 "keyboard-focus-manager-impl.h"
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/devel-api/actors/actor-devel.h>
  23 #include <dali/devel-api/adaptor-framework/lifecycle-controller.h>
  24 #include <dali/devel-api/common/singleton-service.h>
  25 #include <dali/integration-api/adaptor-framework/adaptor.h>
  26 #include <dali/integration-api/adaptor-framework/scene-holder.h>
  27 #include <dali/integration-api/debug.h>
  28 #include <dali/public-api/actors/layer.h>
  29 #include <dali/public-api/animation/constraints.h>
  30 #include <dali/public-api/events/key-event.h>
  31 #include <dali/public-api/events/touch-event.h>
  32 #include <dali/public-api/events/wheel-event.h>
  33 #include <dali/public-api/object/property-map.h>
  34 #include <dali/public-api/object/type-registry-helper.h>
  35 #include <dali/public-api/object/type-registry.h>
  36 #include <cstring> // for strcmp
  37
  38 // INTERNAL INCLUDES
  39 #include <dali-toolkit/devel-api/asset-manager/asset-manager.h>
  40 #include <dali-toolkit/devel-api/controls/control-devel.h>
  41 #include <dali-toolkit/devel-api/focus-manager/focus-finder.h>
  42 #include <dali-toolkit/devel-api/styling/style-manager-devel.h>
  43 #include <dali-toolkit/public-api/controls/control-impl.h>
  44 #include <dali-toolkit/public-api/controls/control.h>
  45 #include <dali-toolkit/public-api/controls/image-view/image-view.h>
  46 #include <dali-toolkit/public-api/styling/style-manager.h>
  47 #include <dali/devel-api/adaptor-framework/accessibility.h>
  48
  49 namespace Dali
  50 {
  51 namespace Toolkit
  52 {
  53 namespace Internal
  54 {
  55 namespace // Unnamed namespace
  56 {
  57 #if defined(DEBUG_ENABLED)
  58 Debug::Filter* gLogFilter = Debug::Filter::New(Debug::NoLogging, false, "LOG_KEYBOARD_FOCUS_MANAGER");
  59 #endif
  60
  61 const char* const IS_FOCUS_GROUP_PROPERTY_NAME = "isKeyboardFocusGroup"; // This property will be replaced by a flag in Control.
  62
  63 const char* const FOCUS_BORDER_IMAGE_FILE_NAME = "keyboard_focus.9.png";
  64
  65 BaseHandle Create()
  66 {
  67   BaseHandle handle = KeyboardFocusManager::Get();
  68
  69   if(!handle)
  70   {
  71     SingletonService singletonService(SingletonService::Get());
  72     if(singletonService)
  73     {
  74       Toolkit::KeyboardFocusManager manager = Toolkit::KeyboardFocusManager(new Internal::KeyboardFocusManager());
  75       singletonService.Register(typeid(manager), manager);
  76       handle = manager;
  77     }
  78   }
  79
  80   return handle;
  81 }
  82
  83 DALI_TYPE_REGISTRATION_BEGIN_CREATE(Toolkit::KeyboardFocusManager, Dali::BaseHandle, Create, true)
  84
  85 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardPreFocusChange", SIGNAL_PRE_FOCUS_CHANGE)
  86 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardFocusChanged", SIGNAL_FOCUS_CHANGED)
  87 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardFocusGroupChanged", SIGNAL_FOCUS_GROUP_CHANGED)
  88 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardFocusedActorEnterKey", SIGNAL_FOCUSED_ACTOR_ENTER_KEY)
  89
  90 DALI_TYPE_REGISTRATION_END()
  91
  92 const unsigned int MAX_HISTORY_AMOUNT = 30; ///< Max length of focus history stack
  93
  94 } // unnamed namespace
  95
  96 Toolkit::KeyboardFocusManager KeyboardFocusManager::Get()
  97 {
  98   Toolkit::KeyboardFocusManager manager;
  99
 100   SingletonService singletonService(SingletonService::Get());
 101   if(singletonService)
 102   {
 103     // Check whether the keyboard focus manager is already created
 104     Dali::BaseHandle handle = singletonService.GetSingleton(typeid(Toolkit::KeyboardFocusManager));
 105     if(handle)
 106     {
 107       // If so, downcast the handle of singleton to keyboard focus manager
 108       manager = Toolkit::KeyboardFocusManager(dynamic_cast<KeyboardFocusManager*>(handle.GetObjectPtr()));
 109     }
 110   }
 111
 112   return manager;
 113 }
 114
 115 KeyboardFocusManager::KeyboardFocusManager()
 116 : mPreFocusChangeSignal(),
 117   mFocusChangedSignal(),
 118   mFocusGroupChangedSignal(),
 119   mFocusedActorEnterKeySignal(),
 120   mCurrentFocusActor(),
 121   mFocusIndicatorActor(),
 122   mFocusHistory(),
 123   mSlotDelegate(this),
 124   mCustomAlgorithmInterface(NULL),
 125   mCurrentFocusedWindow(),
 126   mIsFocusIndicatorShown(UNKNOWN),
 127   mEnableFocusIndicator(ENABLE),
 128   mAlwaysShowIndicator(ALWAYS_SHOW),
 129   mFocusGroupLoopEnabled(false),
 130   mIsWaitingKeyboardFocusChangeCommit(false),
 131   mClearFocusOnTouch(true),
 132   mEnableDefaultAlgorithm(false)
 133 {
 134   // TODO: Get FocusIndicatorEnable constant from stylesheet to set mIsFocusIndicatorShown.
 135
 136   LifecycleController::Get().InitSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnAdaptorInit);
 137 }
 138
 139 void KeyboardFocusManager::OnAdaptorInit()
 140 {
 141   if(Adaptor::IsAvailable())
 142   {
 143     // Retrieve all the existing scene holders
 144     Dali::SceneHolderList sceneHolders = Adaptor::Get().GetSceneHolders();
 145     for(auto iter = sceneHolders.begin(); iter != sceneHolders.end(); ++iter)
 146     {
 147       (*iter).KeyEventSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnKeyEvent);
 148       (*iter).TouchedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnTouch);
 149       (*iter).WheelEventGeneratedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnCustomWheelEvent);
 150       (*iter).WheelEventSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWheelEvent);
 151       Dali::Window window = DevelWindow::DownCast(*iter);
 152       if(window)
 153       {
 154         window.FocusChangeSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWindowFocusChanged);
 155       }
 156     }
 157
 158     // Get notified when any new scene holder is created afterwards
 159     Adaptor::Get().WindowCreatedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnSceneHolderCreated);
 160   }
 161 }
 162
 163 void KeyboardFocusManager::OnSceneHolderCreated(Dali::Integration::SceneHolder& sceneHolder)
 164 {
 165   sceneHolder.KeyEventSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnKeyEvent);
 166   sceneHolder.TouchedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnTouch);
 167   sceneHolder.WheelEventGeneratedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnCustomWheelEvent);
 168   sceneHolder.WheelEventSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWheelEvent);
 169   Dali::Window window = DevelWindow::DownCast(sceneHolder);
 170   if(window)
 171   {
 172     window.FocusChangeSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWindowFocusChanged);
 173   }
 174 }
 175
 176 KeyboardFocusManager::~KeyboardFocusManager()
 177 {
 178 }
 179
 180 void KeyboardFocusManager::GetConfigurationFromStyleManger()
 181 {
 182   Toolkit::StyleManager styleManager = Toolkit::StyleManager::Get();
 183   if(styleManager)
 184   {
 185     Property::Map config   = Toolkit::DevelStyleManager::GetConfigurations(styleManager);
 186     mAlwaysShowIndicator   = config["alwaysShowFocus"].Get<bool>() ? ALWAYS_SHOW : NONE;
 187     mIsFocusIndicatorShown = (mAlwaysShowIndicator == ALWAYS_SHOW) ? SHOW : HIDE;
 188     mClearFocusOnTouch     = (mIsFocusIndicatorShown == SHOW) ? false : true;
 189   }
 190 }
 191
 192 bool KeyboardFocusManager::SetCurrentFocusActor(Actor actor)
 193 {
 194   DALI_ASSERT_DEBUG(!mIsWaitingKeyboardFocusChangeCommit && "Calling this function in the PreFocusChangeSignal callback?");
 195
 196   if(mIsFocusIndicatorShown == UNKNOWN)
 197   {
 198     GetConfigurationFromStyleManger();
 199   }
 200
 201   return DoSetCurrentFocusActor(actor);
 202 }
 203
 204 bool KeyboardFocusManager::DoSetCurrentFocusActor(Actor actor)
 205 {
 206   bool success = false;
 207
 208   // If the parent's KEYBOARD_FOCUSABLE_CHILDREN is false, it cannot have focus.
 209   if(actor)
 210   {
 211     Actor parent = actor.GetParent();
 212     while(parent)
 213     {
 214       if(!parent.GetProperty<bool>(DevelActor::Property::KEYBOARD_FOCUSABLE_CHILDREN))
 215       {
 216         DALI_LOG_INFO(gLogFilter, Debug::General, "[%s:%d] Parent Actor has KEYBOARD_FOCUSABLE_CHILDREN false,\n", __FUNCTION__, __LINE__);
 217         return false;
 218       }
 219       parent = parent.GetParent();
 220     }
 221   }
 222
 223   if(actor && actor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE) && actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 224   {
 225     Integration::SceneHolder currentWindow = Integration::SceneHolder::Get(actor);
 226
 227     if(currentWindow.GetRootLayer() != mCurrentFocusedWindow.GetHandle())
 228     {
 229       Layer rootLayer       = currentWindow.GetRootLayer();
 230       mCurrentFocusedWindow = rootLayer;
 231     }
 232   }
 233
 234   Actor currentFocusedActor = GetCurrentFocusActor();
 235
 236   // If developer set focus on same actor, doing nothing
 237   if(actor == currentFocusedActor)
 238   {
 239     if(!actor)
 240     {
 241       return false;
 242     }
 243     return true;
 244   }
 245
 246   // Check whether the actor is in the stage and is keyboard focusable.
 247   if(actor && actor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE) && actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 248   {
 249     if((mIsFocusIndicatorShown == SHOW) && (mEnableFocusIndicator == ENABLE))
 250     {
 251       actor.Add(GetFocusIndicatorActor());
 252     }
 253
 254     // Send notification for the change of focus actor
 255     if(!mFocusChangedSignal.Empty())
 256     {
 257       mFocusChangedSignal.Emit(currentFocusedActor, actor);
 258     }
 259
 260     Toolkit::Control currentlyFocusedControl = Toolkit::Control::DownCast(currentFocusedActor);
 261     if(currentlyFocusedControl)
 262     {
 263       // Do we need it to remember if it was previously DISABLED?
 264       currentlyFocusedControl.SetProperty(DevelControl::Property::STATE, DevelControl::NORMAL);
 265       currentlyFocusedControl.ClearKeyInputFocus();
 266     }
 267
 268     DALI_LOG_INFO(gLogFilter, Debug::General, "[%s:%d] Focus Changed\n", __FUNCTION__, __LINE__);
 269
 270     // Save the current focused actor
 271     mCurrentFocusActor = actor;
 272
 273     bool focusedWindowFound = false;
 274     for(unsigned int i = 0; i < mCurrentFocusActors.size(); i++)
 275     {
 276       if(mCurrentFocusActors[i].first == mCurrentFocusedWindow)
 277       {
 278         mCurrentFocusActors[i].second = actor;
 279         focusedWindowFound            = true;
 280         break;
 281       }
 282     }
 283     if(!focusedWindowFound)
 284     {
 285       // A new window gains the focus, so store the focused actor in that window.
 286       mCurrentFocusActors.push_back(std::pair<WeakHandle<Layer>, WeakHandle<Actor> >(mCurrentFocusedWindow, actor));
 287     }
 288
 289     Toolkit::Control newlyFocusedControl = Toolkit::Control::DownCast(actor);
 290     if(newlyFocusedControl)
 291     {
 292       newlyFocusedControl.SetProperty(DevelControl::Property::STATE, DevelControl::FOCUSED);
 293       newlyFocusedControl.SetKeyInputFocus();
 294     }
 295
 296     // Push Current Focused Actor to FocusHistory
 297     mFocusHistory.push_back(actor);
 298
 299     // Delete first element before add new element when Stack is full.
 300     if(mFocusHistory.size() > MAX_HISTORY_AMOUNT)
 301     {
 302       FocusStackIterator beginPos = mFocusHistory.begin();
 303       mFocusHistory.erase(beginPos);
 304     }
 305
 306     DALI_LOG_INFO(gLogFilter, Debug::General, "[%s:%d] SUCCEED\n", __FUNCTION__, __LINE__);
 307     success = true;
 308   }
 309   else
 310   {
 311     DALI_LOG_WARNING("[%s:%d] FAILED\n", __FUNCTION__, __LINE__);
 312   }
 313
 314   return success;
 315 }
 316
 317 Actor KeyboardFocusManager::GetCurrentFocusActor()
 318 {
 319   Actor actor = mCurrentFocusActor.GetHandle();
 320
 321   if(actor && !actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 322   {
 323     // If the actor has been removed from the stage, then it should not be focused
 324     actor.Reset();
 325     mCurrentFocusActor.Reset();
 326   }
 327   return actor;
 328 }
 329
 330 Actor KeyboardFocusManager::GetFocusActorFromCurrentWindow()
 331 {
 332   Actor        actor;
 333   unsigned int index;
 334   for(index = 0; index < mCurrentFocusActors.size(); index++)
 335   {
 336     if(mCurrentFocusActors[index].first == mCurrentFocusedWindow)
 337     {
 338       actor = mCurrentFocusActors[index].second.GetHandle();
 339       break;
 340     }
 341   }
 342
 343   if(actor && !actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 344   {
 345     // If the actor has been removed from the window, then the window doesn't have any focused actor
 346     actor.Reset();
 347     mCurrentFocusActors.erase(mCurrentFocusActors.begin() + index);
 348   }
 349
 350   return actor;
 351 }
 352
 353 Actor KeyboardFocusManager::GetCurrentFocusGroup()
 354 {
 355   return GetFocusGroup(GetCurrentFocusActor());
 356 }
 357
 358 void KeyboardFocusManager::MoveFocusBackward()
 359 {
 360   // Find Pre Focused Actor when the list size is more than 1
 361   if(mFocusHistory.size() > 1)
 362   {
 363     // Delete current focused actor in history
 364     mFocusHistory.pop_back();
 365
 366     // If pre-focused actors are not on stage or deleted, remove them in stack
 367     while(mFocusHistory.size() > 0)
 368     {
 369       // Get pre focused actor
 370       Actor target = mFocusHistory[mFocusHistory.size() - 1].GetHandle();
 371
 372       // Impl of Actor is not null
 373       if(target && target.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 374       {
 375         // Delete pre focused actor in history because it will pushed again by SetCurrentFocusActor()
 376         mFocusHistory.pop_back();
 377         SetCurrentFocusActor(target);
 378         break;
 379       }
 380       else
 381       {
 382         // Target is empty handle or off stage. Erase from queue
 383         mFocusHistory.pop_back();
 384       }
 385     }
 386
 387     // if there is no actor which can get focus, then push current focus actor in stack again
 388     if(mFocusHistory.size() == 0)
 389     {
 390       Actor currentFocusedActor = GetCurrentFocusActor();
 391       mFocusHistory.push_back(currentFocusedActor);
 392     }
 393   }
 394 }
 395
 396 bool KeyboardFocusManager::IsLayoutControl(Actor actor) const
 397 {
 398   Toolkit::Control control = Toolkit::Control::DownCast(actor);
 399   return control && GetImplementation(control).IsKeyboardNavigationSupported();
 400 }
 401
 402 Toolkit::Control KeyboardFocusManager::GetParentLayoutControl(Actor actor) const
 403 {
 404   // Get the actor's parent layout control that supports two dimensional keyboard navigation
 405   Actor rootActor;
 406   Actor parent;
 407   if(actor)
 408   {
 409     Integration::SceneHolder window = Integration::SceneHolder::Get(actor);
 410     if(window)
 411     {
 412       rootActor = window.GetRootLayer();
 413     }
 414
 415     parent = actor.GetParent();
 416   }
 417
 418   while(parent && !IsLayoutControl(parent) && parent != rootActor)
 419   {
 420     parent = parent.GetParent();
 421   }
 422
 423   return Toolkit::Control::DownCast(parent);
 424 }
 425
 426 bool KeyboardFocusManager::MoveFocus(Toolkit::Control::KeyboardFocus::Direction direction)
 427 {
 428   Actor currentFocusActor = GetCurrentFocusActor();
 429
 430   bool succeed = false;
 431
 432   // Go through the actor's hierarchy until we find a layout control that knows how to move the focus
 433   Toolkit::Control parentLayoutControl = GetParentLayoutControl(currentFocusActor);
 434   while(parentLayoutControl && !succeed)
 435   {
 436     succeed             = DoMoveFocusWithinLayoutControl(parentLayoutControl, currentFocusActor, direction);
 437     parentLayoutControl = GetParentLayoutControl(parentLayoutControl);
 438   }
 439
 440   if(!succeed)
 441   {
 442     Actor nextFocusableActor;
 443
 444     Toolkit::Control currentFocusControl = Toolkit::Control::DownCast(currentFocusActor);
 445
 446     // If the current focused actor is a control, then find the next focusable actor via the focusable properties.
 447     if(currentFocusControl)
 448     {
 449       int             actorId = -1;
 450       Property::Index index   = Property::INVALID_INDEX;
 451       Property::Value value;
 452
 453       // Find property index based upon focus direction
 454       switch(direction)
 455       {
 456         case Toolkit::Control::KeyboardFocus::LEFT:
 457         {
 458           index = Toolkit::DevelControl::Property::LEFT_FOCUSABLE_ACTOR_ID;
 459           break;
 460         }
 461         case Toolkit::Control::KeyboardFocus::RIGHT:
 462         {
 463           index = Toolkit::DevelControl::Property::RIGHT_FOCUSABLE_ACTOR_ID;
 464           break;
 465         }
 466         case Toolkit::Control::KeyboardFocus::UP:
 467         {
 468           index = Toolkit::DevelControl::Property::UP_FOCUSABLE_ACTOR_ID;
 469           break;
 470         }
 471         case Toolkit::Control::KeyboardFocus::DOWN:
 472         {
 473           index = Toolkit::DevelControl::Property::DOWN_FOCUSABLE_ACTOR_ID;
 474           break;
 475         }
 476         case Toolkit::Control::KeyboardFocus::CLOCKWISE:
 477         {
 478           index = Toolkit::DevelControl::Property::CLOCKWISE_FOCUSABLE_ACTOR_ID;
 479           break;
 480         }
 481         case Toolkit::Control::KeyboardFocus::COUNTER_CLOCKWISE:
 482         {
 483           index = Toolkit::DevelControl::Property::COUNTER_CLOCKWISE_FOCUSABLE_ACTOR_ID;
 484           break;
 485         }
 486         default:
 487           break;
 488       }
 489
 490       // If the focusable property is set then determine next focusable actor
 491       if(index != Property::INVALID_INDEX)
 492       {
 493         value   = currentFocusActor.GetProperty(index);
 494         actorId = value.Get<int>();
 495
 496         // If actor's id is valid then find actor form actor's id. The actor should be on the stage.
 497         if(actorId != -1)
 498         {
 499           if(currentFocusActor.GetParent())
 500           {
 501             nextFocusableActor = currentFocusActor.GetParent().FindChildById(actorId);
 502           }
 503
 504           if(!nextFocusableActor)
 505           {
 506             Integration::SceneHolder window = Integration::SceneHolder::Get(currentFocusActor);
 507             if(window)
 508             {
 509               nextFocusableActor = window.GetRootLayer().FindChildById(actorId);
 510             }
 511           }
 512         }
 513       }
 514     }
 515
 516     if(!nextFocusableActor)
 517     {
 518       // If the implementation of CustomAlgorithmInterface is provided then the PreFocusChangeSignal is no longer emitted.
 519       if(mCustomAlgorithmInterface)
 520       {
 521         mIsWaitingKeyboardFocusChangeCommit = true;
 522         nextFocusableActor                  = mCustomAlgorithmInterface->GetNextFocusableActor(currentFocusActor, Actor(), direction);
 523         mIsWaitingKeyboardFocusChangeCommit = false;
 524       }
 525       else if(!mPreFocusChangeSignal.Empty())
 526       {
 527         // Don't know how to move the focus further. The application needs to tell us which actor to move the focus to
 528         mIsWaitingKeyboardFocusChangeCommit = true;
 529         nextFocusableActor                  = mPreFocusChangeSignal.Emit(currentFocusActor, Actor(), direction);
 530         mIsWaitingKeyboardFocusChangeCommit = false;
 531       }
 532       else if(mEnableDefaultAlgorithm && currentFocusActor)
 533       {
 534         // We should find it among the actors nearby.
 535         Integration::SceneHolder window = Integration::SceneHolder::Get(currentFocusActor);
 536         if(window)
 537         {
 538           nextFocusableActor = Toolkit::FocusFinder::GetNearestFocusableActor(window.GetRootLayer(), currentFocusActor, direction);
 539         }
 540       }
 541     }
 542
 543     if(nextFocusableActor && nextFocusableActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE))
 544     {
 545       // Whether the next focusable actor is a layout control
 546       if(IsLayoutControl(nextFocusableActor))
 547       {
 548         // If so, move the focus inside it.
 549         Toolkit::Control layoutControl = Toolkit::Control::DownCast(nextFocusableActor);
 550         succeed                        = DoMoveFocusWithinLayoutControl(layoutControl, currentFocusActor, direction);
 551       }
 552       else
 553       {
 554         // Otherwise, just set focus to the next focusable actor
 555         succeed = SetCurrentFocusActor(nextFocusableActor);
 556       }
 557     }
 558   }
 559
 560   return succeed;
 561 }
 562
 563 bool KeyboardFocusManager::DoMoveFocusWithinLayoutControl(Toolkit::Control control, Actor actor, Toolkit::Control::KeyboardFocus::Direction direction)
 564 {
 565   // Ask the control for the next actor to focus
 566   Actor nextFocusableActor = GetImplementation(control).GetNextKeyboardFocusableActor(actor, direction, mFocusGroupLoopEnabled);
 567   if(nextFocusableActor)
 568   {
 569     if(!nextFocusableActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE))
 570     {
 571       // If the actor is not focusable, ask the same layout control for the next actor to focus
 572       return DoMoveFocusWithinLayoutControl(control, nextFocusableActor, direction);
 573     }
 574     else
 575     {
 576       Actor currentFocusActor   = GetCurrentFocusActor();
 577       Actor committedFocusActor = nextFocusableActor;
 578
 579       // We will try to move the focus to the actor. Emit a signal to notify the proposed actor to focus
 580       // Signal handler can check the proposed actor and return a different actor if it wishes.
 581       if(!mPreFocusChangeSignal.Empty())
 582       {
 583         mIsWaitingKeyboardFocusChangeCommit = true;
 584         committedFocusActor                 = mPreFocusChangeSignal.Emit(currentFocusActor, nextFocusableActor, direction);
 585         mIsWaitingKeyboardFocusChangeCommit = false;
 586       }
 587
 588       if(committedFocusActor && committedFocusActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE))
 589       {
 590         // Whether the commited focusable actor is a layout control
 591         if(IsLayoutControl(committedFocusActor))
 592         {
 593           // If so, move the focus inside it.
 594           Toolkit::Control layoutControl = Toolkit::Control::DownCast(committedFocusActor);
 595           return DoMoveFocusWithinLayoutControl(layoutControl, currentFocusActor, direction);
 596         }
 597         else
 598         {
 599           // Otherwise, just set focus to the next focusable actor
 600           if(committedFocusActor == nextFocusableActor)
 601           {
 602             // If the application hasn't changed our proposed actor, we informs the layout control we will
 603             // move the focus to what the control returns. The control might wish to perform some actions
 604             // before the focus is actually moved.
 605             GetImplementation(control).OnKeyboardFocusChangeCommitted(committedFocusActor);
 606           }
 607
 608           return SetCurrentFocusActor(committedFocusActor);
 609         }
 610       }
 611       else
 612       {
 613         return false;
 614       }
 615     }
 616   }
 617   else
 618   {
 619     // No more actor can be focused in the given direction within the same layout control.
 620     return false;
 621   }
 622 }
 623
 624 bool KeyboardFocusManager::DoMoveFocusToNextFocusGroup(bool forward)
 625 {
 626   bool succeed = false;
 627
 628   // Get the parent layout control of the current focus group
 629   Toolkit::Control parentLayoutControl = GetParentLayoutControl(GetCurrentFocusGroup());
 630
 631   while(parentLayoutControl && !succeed)
 632   {
 633     // If the current focus group has a parent layout control, we can probably automatically
 634     // move the focus to the next focus group in the forward or backward direction.
 635     Toolkit::Control::KeyboardFocus::Direction direction = forward ? Toolkit::Control::KeyboardFocus::RIGHT : Toolkit::Control::KeyboardFocus::LEFT;
 636     succeed                                              = DoMoveFocusWithinLayoutControl(parentLayoutControl, GetCurrentFocusActor(), direction);
 637     parentLayoutControl                                  = GetParentLayoutControl(parentLayoutControl);
 638   }
 639
 640   if(!mFocusGroupChangedSignal.Empty())
 641   {
 642     // Emit a focus group changed signal. The applicaton can move the focus to a new focus group
 643     mFocusGroupChangedSignal.Emit(GetCurrentFocusActor(), forward);
 644   }
 645
 646   return succeed;
 647 }
 648
 649 void KeyboardFocusManager::DoKeyboardEnter(Actor actor)
 650 {
 651   if(actor)
 652   {
 653     Toolkit::Control control = Toolkit::Control::DownCast(actor);
 654     if(control)
 655     {
 656       // Notify the control that enter has been pressed on it.
 657       GetImplementation(control).KeyboardEnter();
 658     }
 659
 660     // Send a notification for the actor.
 661     if(!mFocusedActorEnterKeySignal.Empty())
 662     {
 663       mFocusedActorEnterKeySignal.Emit(actor);
 664     }
 665   }
 666 }
 667
 668 void KeyboardFocusManager::ClearFocus()
 669 {
 670   Actor actor = GetCurrentFocusActor();
 671   if(actor)
 672   {
 673     if(mFocusIndicatorActor)
 674     {
 675       actor.Remove(mFocusIndicatorActor);
 676     }
 677
 678     // Send notification for the change of focus actor
 679     if(!mFocusChangedSignal.Empty())
 680     {
 681       mFocusChangedSignal.Emit(actor, Actor());
 682     }
 683
 684     Toolkit::Control currentlyFocusedControl = Toolkit::Control::DownCast(actor);
 685     if(currentlyFocusedControl)
 686     {
 687       currentlyFocusedControl.SetProperty(DevelControl::Property::STATE, DevelControl::NORMAL);
 688       currentlyFocusedControl.ClearKeyInputFocus();
 689     }
 690   }
 691
 692   mCurrentFocusActor.Reset();
 693   mIsFocusIndicatorShown = (mAlwaysShowIndicator == ALWAYS_SHOW) ? SHOW : HIDE;
 694 }
 695
 696 void KeyboardFocusManager::SetFocusGroupLoop(bool enabled)
 697 {
 698   mFocusGroupLoopEnabled = enabled;
 699 }
 700
 701 bool KeyboardFocusManager::GetFocusGroupLoop() const
 702 {
 703   return mFocusGroupLoopEnabled;
 704 }
 705
 706 void KeyboardFocusManager::SetAsFocusGroup(Actor actor, bool isFocusGroup)
 707 {
 708   if(actor)
 709   {
 710     // Create/Set focus group property.
 711     actor.RegisterProperty(IS_FOCUS_GROUP_PROPERTY_NAME, isFocusGroup, Property::READ_WRITE);
 712   }
 713 }
 714
 715 bool KeyboardFocusManager::IsFocusGroup(Actor actor) const
 716 {
 717   // Check whether the actor is a focus group
 718   bool isFocusGroup = false;
 719
 720   if(actor)
 721   {
 722     Property::Index propertyIsFocusGroup = actor.GetPropertyIndex(IS_FOCUS_GROUP_PROPERTY_NAME);
 723     if(propertyIsFocusGroup != Property::INVALID_INDEX)
 724     {
 725       isFocusGroup = actor.GetProperty<bool>(propertyIsFocusGroup);
 726     }
 727   }
 728
 729   return isFocusGroup;
 730 }
 731
 732 Actor KeyboardFocusManager::GetFocusGroup(Actor actor)
 733 {
 734   // Go through the actor's hierarchy to check which focus group the actor belongs to
 735   while(actor && !IsFocusGroup(actor))
 736   {
 737     actor = actor.GetParent();
 738   }
 739
 740   return actor;
 741 }
 742
 743 void KeyboardFocusManager::SetFocusIndicatorActor(Actor indicator)
 744 {
 745   if(mFocusIndicatorActor != indicator)
 746   {
 747     Actor currentFocusActor = GetCurrentFocusActor();
 748     if(currentFocusActor)
 749     {
 750       // The new focus indicator should be added to the current focused actor immediately
 751       if(mFocusIndicatorActor)
 752       {
 753         currentFocusActor.Remove(mFocusIndicatorActor);
 754       }
 755
 756       if(indicator)
 757       {
 758         currentFocusActor.Add(indicator);
 759       }
 760     }
 761
 762     mFocusIndicatorActor = indicator;
 763   }
 764 }
 765
 766 Actor KeyboardFocusManager::GetFocusIndicatorActor()
 767 {
 768   if(!mFocusIndicatorActor)
 769   {
 770     // Create the default if it hasn't been set and one that's shared by all the keyboard focusable actors
 771     const std::string imageDirPath = AssetManager::GetDaliImagePath();
 772     mFocusIndicatorActor           = Toolkit::ImageView::New(imageDirPath + FOCUS_BORDER_IMAGE_FILE_NAME);
 773
 774     // Apply size constraint to the focus indicator
 775     mFocusIndicatorActor.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS);
 776   }
 777
 778   mFocusIndicatorActor.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
 779   mFocusIndicatorActor.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
 780   mFocusIndicatorActor.SetProperty(Actor::Property::POSITION, Vector2(0.0f, 0.0f));
 781
 782   return mFocusIndicatorActor;
 783 }
 784
 785 void KeyboardFocusManager::OnKeyEvent(const KeyEvent& event)
 786 {
 787   std::string keyName = event.GetKeyName();
 788
 789   if(mIsFocusIndicatorShown == UNKNOWN)
 790   {
 791     GetConfigurationFromStyleManger();
 792   }
 793
 794   bool isFocusStartableKey = false;
 795
 796   if(event.GetState() == KeyEvent::DOWN)
 797   {
 798     if(keyName == "Left")
 799     {
 800       if(mIsFocusIndicatorShown == HIDE)
 801       {
 802         // Show focus indicator
 803         mIsFocusIndicatorShown = SHOW;
 804       }
 805       else
 806       {
 807         // Move the focus towards left
 808         MoveFocus(Toolkit::Control::KeyboardFocus::LEFT);
 809       }
 810
 811       isFocusStartableKey = true;
 812     }
 813     else if(keyName == "Right")
 814     {
 815       if(mIsFocusIndicatorShown == HIDE)
 816       {
 817         // Show focus indicator
 818         mIsFocusIndicatorShown = SHOW;
 819       }
 820       else
 821       {
 822         // Move the focus towards right
 823         MoveFocus(Toolkit::Control::KeyboardFocus::RIGHT);
 824       }
 825
 826       isFocusStartableKey = true;
 827     }
 828     else if(keyName == "Up")
 829     {
 830       if(mIsFocusIndicatorShown == HIDE)
 831       {
 832         // Show focus indicator
 833         mIsFocusIndicatorShown = SHOW;
 834       }
 835       else
 836       {
 837         // Move the focus towards up
 838         MoveFocus(Toolkit::Control::KeyboardFocus::UP);
 839       }
 840
 841       isFocusStartableKey = true;
 842     }
 843     else if(keyName == "Down")
 844     {
 845       if(mIsFocusIndicatorShown == HIDE)
 846       {
 847         // Show focus indicator
 848         mIsFocusIndicatorShown = SHOW;
 849       }
 850       else
 851       {
 852         // Move the focus towards down
 853         MoveFocus(Toolkit::Control::KeyboardFocus::DOWN);
 854       }
 855
 856       isFocusStartableKey = true;
 857     }
 858     else if(keyName == "Prior")
 859     {
 860       if(mIsFocusIndicatorShown == HIDE)
 861       {
 862         // Show focus indicator
 863         mIsFocusIndicatorShown = SHOW;
 864       }
 865       else
 866       {
 867         // Move the focus towards the previous page
 868         MoveFocus(Toolkit::Control::KeyboardFocus::PAGE_UP);
 869       }
 870
 871       isFocusStartableKey = true;
 872     }
 873     else if(keyName == "Next")
 874     {
 875       if(mIsFocusIndicatorShown == HIDE)
 876       {
 877         // Show focus indicator
 878         mIsFocusIndicatorShown = SHOW;
 879       }
 880       else
 881       {
 882         // Move the focus towards the next page
 883         MoveFocus(Toolkit::Control::KeyboardFocus::PAGE_DOWN);
 884       }
 885
 886       isFocusStartableKey = true;
 887     }
 888     else if(keyName == "Tab")
 889     {
 890       if(mIsFocusIndicatorShown == HIDE)
 891       {
 892         // Show focus indicator
 893         mIsFocusIndicatorShown = SHOW;
 894       }
 895       else
 896       {
 897         // "Tab" key changes the focus group in the forward direction and
 898         // "Shift-Tab" key changes it in the backward direction.
 899         if(!DoMoveFocusToNextFocusGroup(!event.IsShiftModifier()))
 900         {
 901           // If the focus group is not changed, Move the focus towards forward, "Shift-Tap" key moves the focus towards backward.
 902           MoveFocus(event.IsShiftModifier() ? Toolkit::Control::KeyboardFocus::BACKWARD : Toolkit::Control::KeyboardFocus::FORWARD);
 903         }
 904       }
 905
 906       isFocusStartableKey = true;
 907     }
 908     else if(keyName == "space")
 909     {
 910       if(mIsFocusIndicatorShown == HIDE)
 911       {
 912         // Show focus indicator
 913         mIsFocusIndicatorShown = SHOW;
 914       }
 915
 916       isFocusStartableKey = true;
 917     }
 918     else if(keyName == "")
 919     {
 920       // Check the fake key event for evas-plugin case
 921       if(mIsFocusIndicatorShown == HIDE)
 922       {
 923         // Show focus indicator
 924         mIsFocusIndicatorShown = SHOW;
 925       }
 926
 927       isFocusStartableKey = true;
 928     }
 929     else if(keyName == "Backspace")
 930     {
 931       // Emit signal to go back to the previous view???
 932     }
 933     else if(keyName == "Escape")
 934     {
 935     }
 936   }
 937   else if(event.GetState() == KeyEvent::UP)
 938   {
 939     if(keyName == "Return")
 940     {
 941       if(mIsFocusIndicatorShown == HIDE)
 942       {
 943         // Show focus indicator
 944         mIsFocusIndicatorShown = SHOW;
 945       }
 946       else
 947       {
 948         // The focused actor has enter pressed on it
 949         Actor actor = GetCurrentFocusActor();
 950         if(actor)
 951         {
 952           DoKeyboardEnter(actor);
 953         }
 954       }
 955
 956       isFocusStartableKey = true;
 957     }
 958   }
 959
 960   if(isFocusStartableKey && mIsFocusIndicatorShown == SHOW)
 961   {
 962     Actor actor = GetCurrentFocusActor();
 963     if(actor)
 964     {
 965       if(mEnableFocusIndicator == ENABLE)
 966       {
 967         // Make sure the focused actor is highlighted
 968         actor.Add(GetFocusIndicatorActor());
 969       }
 970     }
 971     else
 972     {
 973       // No actor is focused but keyboard focus is activated by the key press
 974       // Let's try to move the initial focus
 975       MoveFocus(Toolkit::Control::KeyboardFocus::RIGHT);
 976     }
 977   }
 978 }
 979
 980 void KeyboardFocusManager::OnTouch(const TouchEvent& touch)
 981 {
 982   // if mIsFocusIndicatorShown is UNKNOWN, it means Configuration is not loaded.
 983   // Try to load configuration.
 984   if(mIsFocusIndicatorShown == UNKNOWN)
 985   {
 986     GetConfigurationFromStyleManger();
 987   }
 988
 989   // Clear the focus when user touch the screen.
 990   // We only do this on a Down event, otherwise the clear action may override a manually focused actor.
 991   if(((touch.GetPointCount() < 1) || (touch.GetState(0) == PointState::DOWN)))
 992   {
 993     // If mClearFocusOnTouch is false, do not clear the focus even if user touch the screen.
 994     if(mClearFocusOnTouch)
 995     {
 996       ClearFocus();
 997     }
 998
 999     // If KEYBOARD_FOCUSABLE and TOUCH_FOCUSABLE is true, set focus actor
1000     Actor hitActor = touch.GetHitActor(0);
1001     if(hitActor && hitActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE) && hitActor.GetProperty<bool>(DevelActor::Property::TOUCH_FOCUSABLE))
1002     {
1003       SetCurrentFocusActor(hitActor);
1004     }
1005   }
1006 }
1007
1008 void KeyboardFocusManager::OnWheelEvent(const WheelEvent& event)
1009 {
1010   if(event.GetType() == Dali::WheelEvent::CUSTOM_WHEEL)
1011   {
1012     Toolkit::Control::KeyboardFocus::Direction direction = (event.GetDelta() > 0) ? Toolkit::Control::KeyboardFocus::CLOCKWISE : Toolkit::Control::KeyboardFocus::COUNTER_CLOCKWISE;
1013     // Move the focus
1014     MoveFocus(direction);
1015   }
1016 }
1017
1018 bool KeyboardFocusManager::OnCustomWheelEvent(const WheelEvent& event)
1019 {
1020   bool consumed = false;
1021   Actor actor = GetCurrentFocusActor();
1022   if(actor)
1023   {
1024     // Notify the actor about the wheel event
1025     consumed = EmitCustomWheelSignals(actor, event);
1026   }
1027   return consumed;
1028 }
1029
1030 bool KeyboardFocusManager::EmitCustomWheelSignals(Actor actor, const WheelEvent& event)
1031 {
1032   bool consumed = false;
1033
1034   if(actor)
1035   {
1036     Dali::Actor oldParent(actor.GetParent());
1037
1038     // Only do the conversion and emit the signal if the actor's wheel signal has connections.
1039     if(!actor.WheelEventSignal().Empty())
1040     {
1041       // Emit the signal to the parent
1042       consumed = actor.WheelEventSignal().Emit(actor, event);
1043     }
1044     // if actor doesn't consume WheelEvent, give WheelEvent to its parent.
1045     if(!consumed)
1046     {
1047       // The actor may have been removed/reparented during the signal callbacks.
1048       Dali::Actor parent = actor.GetParent();
1049
1050       if(parent &&
1051          (parent == oldParent))
1052       {
1053         consumed = EmitCustomWheelSignals(parent, event);
1054       }
1055     }
1056   }
1057
1058   return consumed;
1059 }
1060
1061 void KeyboardFocusManager::OnWindowFocusChanged(Window window, bool focusIn)
1062 {
1063   if(focusIn && mCurrentFocusedWindow.GetHandle() != window.GetRootLayer())
1064   {
1065     // Change Current Focused Window
1066     Layer rootLayer       = window.GetRootLayer();
1067     mCurrentFocusedWindow = rootLayer;
1068
1069     // Get Current Focused Actor from window
1070     Actor currentFocusedActor = GetFocusActorFromCurrentWindow();
1071     SetCurrentFocusActor(currentFocusedActor);
1072
1073     if(currentFocusedActor && (mEnableFocusIndicator == ENABLE))
1074     {
1075       // Make sure the focused actor is highlighted
1076       currentFocusedActor.Add(GetFocusIndicatorActor());
1077       mIsFocusIndicatorShown = SHOW;
1078     }
1079   }
1080 }
1081
1082 Toolkit::KeyboardFocusManager::PreFocusChangeSignalType& KeyboardFocusManager::PreFocusChangeSignal()
1083 {
1084   return mPreFocusChangeSignal;
1085 }
1086
1087 Toolkit::KeyboardFocusManager::FocusChangedSignalType& KeyboardFocusManager::FocusChangedSignal()
1088 {
1089   return mFocusChangedSignal;
1090 }
1091
1092 Toolkit::KeyboardFocusManager::FocusGroupChangedSignalType& KeyboardFocusManager::FocusGroupChangedSignal()
1093 {
1094   return mFocusGroupChangedSignal;
1095 }
1096
1097 Toolkit::KeyboardFocusManager::FocusedActorEnterKeySignalType& KeyboardFocusManager::FocusedActorEnterKeySignal()
1098 {
1099   return mFocusedActorEnterKeySignal;
1100 }
1101
1102 bool KeyboardFocusManager::DoConnectSignal(BaseObject* object, ConnectionTrackerInterface* tracker, const std::string& signalName, FunctorDelegate* functor)
1103 {
1104   Dali::BaseHandle handle(object);
1105
1106   bool                  connected(true);
1107   KeyboardFocusManager* manager = static_cast<KeyboardFocusManager*>(object); // TypeRegistry guarantees that this is the correct type.
1108
1109   if(0 == strcmp(signalName.c_str(), SIGNAL_PRE_FOCUS_CHANGE))
1110   {
1111     manager->PreFocusChangeSignal().Connect(tracker, functor);
1112   }
1113   else if(0 == strcmp(signalName.c_str(), SIGNAL_FOCUS_CHANGED))
1114   {
1115     manager->FocusChangedSignal().Connect(tracker, functor);
1116   }
1117   else if(0 == strcmp(signalName.c_str(), SIGNAL_FOCUS_GROUP_CHANGED))
1118   {
1119     manager->FocusGroupChangedSignal().Connect(tracker, functor);
1120   }
1121   else if(0 == strcmp(signalName.c_str(), SIGNAL_FOCUSED_ACTOR_ENTER_KEY))
1122   {
1123     manager->FocusedActorEnterKeySignal().Connect(tracker, functor);
1124   }
1125   else
1126   {
1127     // signalName does not match any signal
1128     connected = false;
1129   }
1130
1131   return connected;
1132 }
1133
1134 void KeyboardFocusManager::SetCustomAlgorithm(CustomAlgorithmInterface& interface)
1135 {
1136   mCustomAlgorithmInterface = &interface;
1137 }
1138
1139 void KeyboardFocusManager::EnableFocusIndicator(bool enable)
1140 {
1141   if(!enable && mFocusIndicatorActor)
1142   {
1143     mFocusIndicatorActor.Unparent();
1144   }
1145
1146   mEnableFocusIndicator = enable ? ENABLE : DISABLE;
1147 }
1148
1149 bool KeyboardFocusManager::IsFocusIndicatorEnabled() const
1150 {
1151   return (mEnableFocusIndicator == ENABLE);
1152 }
1153
1154 void KeyboardFocusManager::EnableDefaultAlgorithm(bool enable)
1155 {
1156   mEnableDefaultAlgorithm = enable;
1157 }
1158
1159 bool KeyboardFocusManager::IsDefaultAlgorithmEnabled() const
1160 {
1161   return mEnableDefaultAlgorithm;
1162 }
1163
1164 } // namespace Internal
1165
1166 } // namespace Toolkit
1167
1168 } // namespace Dali