src/Tizen.NUI/src/public/FocusManager.cs

   1 // Copyright (c) 2017 Samsung Electronics Co., Ltd.
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 // http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14 //
  15 //
  16 // This File has been auto-generated by SWIG and then modified using DALi Ruby Scripts
  17 // Some have been manually changed
  18
  19
  20 namespace Tizen.NUI
  21 {
  22
  23     using System;
  24     using System.Runtime.InteropServices;
  25     using Tizen.NUI.BaseComponents;
  26
  27     /// <summary>
  28     /// Provides the functionality of handling keyboard navigation and maintaining the two dimensional keyboard focus chain.<br>
  29     /// It provides functionality of setting the focus and moving the focus in four directions(i.e.Left, Right, Up and Down).<br>
  30     /// It also draws a highlight for the focused View and sends a event when the focus is changed.<br>
  31     /// </summary>
  32     public class FocusManager : BaseHandle
  33     {
  34         private global::System.Runtime.InteropServices.HandleRef swigCPtr;
  35         private CustomAlgorithmInterfaceWrapper _customAlgorithmInterfaceWrapper;
  36
  37         internal FocusManager(global::System.IntPtr cPtr, bool cMemoryOwn) : base(NDalicManualPINVOKE.FocusManager_SWIGUpcast(cPtr), cMemoryOwn)
  38         {
  39             swigCPtr = new global::System.Runtime.InteropServices.HandleRef(this, cPtr);
  40         }
  41
  42         internal static global::System.Runtime.InteropServices.HandleRef getCPtr(FocusManager obj)
  43         {
  44             return (obj == null) ? new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero) : obj.swigCPtr;
  45         }
  46
  47         /// <summary>
  48         /// To make FocusManager instance be disposed.
  49         /// </summary>
  50         protected override void Dispose(DisposeTypes type)
  51         {
  52             if(disposed)
  53             {
  54                 return;
  55             }
  56
  57             if(type == DisposeTypes.Explicit)
  58             {
  59                 //Called by User
  60                 //Release your own managed resources here.
  61                 //You should release all of your own disposable objects here.
  62             }
  63
  64             //Release your own unmanaged resources here.
  65             //You should not access any managed member here except static instance.
  66             //because the execution order of Finalizes is non-deterministic.
  67
  68             if (swigCPtr.Handle != global::System.IntPtr.Zero)
  69             {
  70                 if (swigCMemOwn)
  71                 {
  72                     swigCMemOwn = false;
  73                     NDalicManualPINVOKE.delete_FocusManager(swigCPtr);
  74                 }
  75                 swigCPtr = new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero);
  76             }
  77
  78             base.Dispose(type);
  79         }
  80
  81
  82         ///<summary>
  83         ///Event arguments that passed via PreFocusChange signal
  84         /// </summary>
  85         public class PreFocusChangeEventArgs : EventArgs
  86         {
  87             private View _current;
  88             private View _proposed;
  89             private View.FocusDirection _direction;
  90
  91             public View CurrentView
  92             {
  93                 get
  94                 {
  95                     return _current;
  96                 }
  97                 set
  98                 {
  99                     _current = value;
 100                 }
 101             }
 102
 103             public View ProposedView
 104             {
 105                 get
 106                 {
 107                     return _proposed;
 108                 }
 109                 set
 110                 {
 111                     _proposed = value;
 112                 }
 113             }
 114
 115             public View.FocusDirection Direction
 116             {
 117                 get
 118                 {
 119                     return _direction;
 120                 }
 121                 set
 122                 {
 123                     _direction = value;
 124                 }
 125             }
 126         }
 127
 128         private EventHandlerWithReturnType<object, PreFocusChangeEventArgs, View> _preFocusChangeEventHandler;
 129         [UnmanagedFunctionPointer(CallingConvention.StdCall)]
 130         internal delegate IntPtr PreFocusChangeEventCallback(IntPtr current, IntPtr proposed, View.FocusDirection direction);
 131         private PreFocusChangeEventCallback _preFocusChangeCallback;
 132
 133         /// <summary>
 134         /// PreFocusChange will be triggered before the focus is going to be changed.<br>
 135         /// FocusManager makes the best guess for which view to focus towards the given direction, but applications might want to change that.<br>
 136         /// By connecting with this event, they can check the proposed view to focus and return a different view if they wish.<br>
 137         /// This event is only triggered when the navigation key is pressed and KeyboardFocusManager tries to move the focus automatically.<br>
 138         /// It won't be emitted for focus movement by calling SetCurrentFocusView directly.<br>
 139         /// </summary>
 140         public event EventHandlerWithReturnType<object, PreFocusChangeEventArgs, View> PreFocusChange
 141         {
 142             add
 143             {
 144                 if (_preFocusChangeEventHandler == null)
 145                 {
 146 #if DEBUG_ON
 147                     Tizen.Log.Debug("NUI", "con1) PreFocusChangeSignal().Empty = " + PreFocusChangeSignal().Empty());
 148                     Tizen.Log.Debug("NUI", "con2) PreFocusChangeSignal().GetConnectionCount = " + PreFocusChangeSignal().GetConnectionCount());
 149 #endif
 150                     _preFocusChangeCallback = OnPreFocusChange;
 151                     PreFocusChangeSignal().Connect(_preFocusChangeCallback);
 152 #if DEBUG_ON
 153                     Tizen.Log.Debug("NUI", "con3) PreFocusChangeSignal().Empty = " + PreFocusChangeSignal().Empty());
 154                     Tizen.Log.Debug("NUI", "con4) PreFocusChangeSignal().GetConnectionCount = " + PreFocusChangeSignal().GetConnectionCount());
 155 #endif
 156                 }
 157                 _preFocusChangeEventHandler += value;
 158             }
 159             remove
 160             {
 161                 _preFocusChangeEventHandler -= value;
 162                 if (_preFocusChangeEventHandler == null && PreFocusChangeSignal().Empty() == false)
 163                 {
 164 #if DEBUG_ON
 165                     Tizen.Log.Debug("NUI", "discon1) PreFocusChangeSignal().Empty = " + PreFocusChangeSignal().Empty());
 166                     Tizen.Log.Debug("NUI", "discon2) PreFocusChangeSignal().GetConnectionCount = " + PreFocusChangeSignal().GetConnectionCount());
 167 #endif
 168                     PreFocusChangeSignal().Disconnect(_preFocusChangeCallback);
 169 #if DEBUG_ON
 170                     Tizen.Log.Debug("NUI", "discon3) PreFocusChangeSignal().Empty = " + PreFocusChangeSignal().Empty());
 171                     Tizen.Log.Debug("NUI", "discon4) PreFocusChangeSignal().GetConnectionCount = " + PreFocusChangeSignal().GetConnectionCount());
 172 #endif
 173                 }
 174             }
 175         }
 176
 177         private IntPtr OnPreFocusChange(IntPtr current, IntPtr proposed, View.FocusDirection direction)
 178         {
 179             View view = null;
 180             PreFocusChangeEventArgs e = new PreFocusChangeEventArgs();
 181
 182             if (current != global::System.IntPtr.Zero)
 183             {
 184                 e.CurrentView = View.GetViewFromPtr(current);
 185             }
 186             if (proposed != global::System.IntPtr.Zero)
 187             {
 188                 e.ProposedView = View.GetViewFromPtr(proposed);
 189             }
 190             e.Direction = direction;
 191
 192             if (_preFocusChangeEventHandler != null)
 193             {
 194                 view = _preFocusChangeEventHandler(this, e);
 195             }
 196
 197             if (view)
 198             {
 199                 return view.GetPtrfromView();
 200             }
 201             else
 202             {
 203                 //if (e.ProposedView) return proposed;
 204                 //else return current;
 205                 return current; //xb.teng
 206             }
 207         }
 208
 209         ///<summary>
 210         ///Event arguments that passed via FocusChanged signal.
 211         /// </summary>
 212         public class FocusChangedEventArgs : EventArgs
 213         {
 214             private View _current;
 215             private View _next;
 216
 217             public View CurrentView
 218             {
 219                 get
 220                 {
 221                     return _current;
 222                 }
 223                 set
 224                 {
 225                     _current = value;
 226                 }
 227             }
 228
 229             public View NextView
 230             {
 231                 get
 232                 {
 233                     return _next;
 234                 }
 235                 set
 236                 {
 237                     _next = value;
 238                 }
 239             }
 240         }
 241
 242         private EventHandler<FocusChangedEventArgs> _focusChangedEventHandler;
 243         [UnmanagedFunctionPointer(CallingConvention.StdCall)]
 244         internal delegate void FocusChangedEventCallback(IntPtr current, IntPtr next);
 245         private FocusChangedEventCallback _focusChangedEventCallback;
 246
 247         /// <summary>
 248         /// FocusGroupChanged will be triggered after the current focused view has been changed.
 249         /// </summary>
 250         public event EventHandler<FocusChangedEventArgs> FocusChanged
 251         {
 252             add
 253             {
 254                 if (_focusChangedEventCallback == null)
 255                 {
 256                     _focusChangedEventCallback = OnFocusChanged;
 257                     FocusChangedSignal().Connect(_focusChangedEventCallback);
 258                 }
 259                 _focusChangedEventHandler += value;
 260             }
 261             remove
 262             {
 263                 _focusChangedEventHandler -= value;
 264
 265                 if (_focusChangedEventCallback == null && FocusChangedSignal().Empty() == false)
 266                 {
 267                     FocusChangedSignal().Disconnect(_focusChangedEventCallback);
 268                 }
 269             }
 270         }
 271
 272         private void OnFocusChanged(IntPtr current, IntPtr next)
 273         {
 274             FocusChangedEventArgs e = new FocusChangedEventArgs();
 275
 276             e.CurrentView = View.GetViewFromPtr(current);
 277             e.NextView = View.GetViewFromPtr(next);
 278
 279             if (_focusChangedEventHandler != null)
 280             {
 281                 _focusChangedEventHandler(this, e);
 282             }
 283         }
 284
 285         ///<summary>
 286         ///Event arguments that passed via FocusGroupChanged signal.
 287         /// </summary>
 288         public class FocusGroupChangedEventArgs : EventArgs
 289         {
 290             private View _current;
 291             private bool _forwardDirection;
 292
 293             public View CurrentView
 294             {
 295                 get
 296                 {
 297                     return _current;
 298                 }
 299                 set
 300                 {
 301                     _current = value;
 302                 }
 303             }
 304
 305             public bool ForwardDirection
 306             {
 307                 get
 308                 {
 309                     return _forwardDirection;
 310                 }
 311                 set
 312                 {
 313                     _forwardDirection = value;
 314                 }
 315             }
 316         }
 317
 318         private EventHandler<FocusGroupChangedEventArgs> _focusGroupChangedEventHandler;
 319         [UnmanagedFunctionPointer(CallingConvention.StdCall)]
 320         private delegate void FocusGroupChangedEventCallback(IntPtr current, bool forwardDirection);
 321         private FocusGroupChangedEventCallback _focusGroupChangedEventCallback;
 322
 323         /// <summary>
 324         /// FocusGroupChanged will be triggered when the focus group has been changed.<br>
 325         /// If the current focus group has a parent layout control, FocusManager will make the best guess for the next focus group to move the focus to in the given direction (forward or backward).<br>
 326         /// If not, the application has to set the new focus.<br>
 327         /// </summary>
 328         public event EventHandler<FocusGroupChangedEventArgs> FocusGroupChanged
 329         {
 330             add
 331             {
 332                 if (_focusGroupChangedEventCallback == null)
 333                 {
 334                     _focusGroupChangedEventCallback = OnFocusGroupChanged;
 335                     FocusGroupChangedSignal().Connect(_focusGroupChangedEventCallback);
 336                 }
 337                 _focusGroupChangedEventHandler += value;
 338             }
 339             remove
 340             {
 341                 _focusGroupChangedEventHandler -= value;
 342
 343                 if (_focusGroupChangedEventCallback == null && FocusGroupChangedSignal().Empty() == false)
 344                 {
 345                     FocusGroupChangedSignal().Disconnect(_focusGroupChangedEventCallback);
 346                 }
 347             }
 348         }
 349
 350         private void OnFocusGroupChanged(IntPtr current, bool forwardDirection)
 351         {
 352             FocusGroupChangedEventArgs e = new FocusGroupChangedEventArgs();
 353
 354             e.CurrentView = View.GetViewFromPtr(current);
 355             e.ForwardDirection = forwardDirection;
 356
 357             if (_focusGroupChangedEventHandler != null)
 358             {
 359                 _focusGroupChangedEventHandler(this, e);
 360             }
 361         }
 362
 363         ///<summary>
 364         ///Event arguments that passed via FocusedViewEnterKey signal
 365         /// </summary>
 366         public class FocusedViewActivatedEventArgs : EventArgs
 367         {
 368             private View _view;
 369
 370             public View View
 371             {
 372                 get
 373                 {
 374                     return _view;
 375                 }
 376                 set
 377                 {
 378                     _view = value;
 379                 }
 380             }
 381         }
 382
 383         private EventHandler<FocusedViewActivatedEventArgs> _focusedViewEnterKeyEventHandler;
 384         [UnmanagedFunctionPointer(CallingConvention.StdCall)]
 385         private delegate void FocusedViewEnterKeyEventCallback(IntPtr view);
 386         private FocusedViewEnterKeyEventCallback _focusedViewEnterKeyEventCallback;
 387
 388         /// <summary>
 389         /// FocusedViewActivated will be triggered when the current focused view has the enter key pressed on it.
 390         /// </summary>
 391         public event EventHandler<FocusedViewActivatedEventArgs> FocusedViewActivated
 392         {
 393             add
 394             {
 395                 if (_focusedViewEnterKeyEventCallback == null)
 396                 {
 397                     _focusedViewEnterKeyEventCallback = OnFocusedViewEnterKey;
 398                     FocusedViewEnterKeySignal().Connect(_focusedViewEnterKeyEventCallback);
 399                 }
 400                 _focusedViewEnterKeyEventHandler += value;
 401             }
 402             remove
 403             {
 404                 _focusedViewEnterKeyEventHandler -= value;
 405
 406                 if (_focusedViewEnterKeyEventCallback == null && FocusedViewEnterKeySignal().Empty() == false)
 407                 {
 408                     FocusedViewEnterKeySignal().Disconnect(_focusedViewEnterKeyEventCallback);
 409                 }
 410             }
 411         }
 412
 413         private void OnFocusedViewEnterKey(IntPtr view)
 414         {
 415             FocusedViewActivatedEventArgs e = new FocusedViewActivatedEventArgs();
 416
 417             e.View = View.GetViewFromPtr(view);
 418
 419             if (_focusedViewEnterKeyEventHandler != null)
 420             {
 421                 _focusedViewEnterKeyEventHandler(this, e);
 422             }
 423         }
 424
 425
 426         internal FocusManager() : this(NDalicManualPINVOKE.new_FocusManager(), true)
 427         {
 428             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 429         }
 430
 431         internal static FocusManager Get()
 432         {
 433             FocusManager ret = new FocusManager(NDalicManualPINVOKE.FocusManager_Get(), true);
 434             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 435             return ret;
 436         }
 437
 438         /// <summary>
 439         /// Moves the keyboard focus to the given View.<br>
 440         /// Only one View can be focused at the same time.<br>
 441         /// The View must be in the stage already and keyboard focusable.<br>
 442         /// </summary>
 443         /// <param name="view">The View to be focused</param>
 444         /// <returns>Whether the focus is successful or not</returns>
 445         public bool SetCurrentFocusView(View view)
 446         {
 447             bool ret = NDalicManualPINVOKE.FocusManager_SetCurrentFocusActor(swigCPtr, View.getCPtr(view));
 448             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 449             return ret;
 450         }
 451
 452         /// <summary>
 453         /// Gets the current focused view.
 454         /// </summary>
 455         /// <returns>A handle to the current focused View or an empty handle if no View is focused</returns>
 456         public View GetCurrentFocusView()
 457         {
 458             View ret = new View(NDalicManualPINVOKE.FocusManager_GetCurrentFocusActor(swigCPtr), true);
 459             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 460             if (ret.HasBody() == false)
 461             {
 462                 return null;
 463             }
 464             return ret;
 465         }
 466
 467         /// <summary>
 468         /// Moves the focus to the next focusable View in the focus chain in the given direction(according to the focus traversal order).
 469         /// </summary>
 470         /// <param name="direction">The direction of focus movement</param>
 471         /// <returns>true if the movement was successful</returns>
 472         public bool MoveFocus(View.FocusDirection direction)
 473         {
 474             bool ret = NDalicManualPINVOKE.FocusManager_MoveFocus(swigCPtr, (int)direction);
 475             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 476             return ret;
 477         }
 478
 479         /// <summary>
 480         /// Clears the focus from the current focused view if any, so that no view is focused in the focus chain.<br>
 481         /// It will emit FocusChanged event without current focused View.<br>
 482         /// </summary>
 483         public void ClearFocus()
 484         {
 485             NDalicManualPINVOKE.FocusManager_ClearFocus(swigCPtr);
 486             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 487         }
 488
 489         /// <summary>
 490         /// Move the focus to prev focused view.
 491         /// </summary>
 492         public void MoveFocusBackward()
 493         {
 494             NDalicManualPINVOKE.FocusManager_MoveFocusBackward(swigCPtr);
 495             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 496         }
 497
 498         /// <summary>
 499         /// Sets/Gets the status of whether the focus movement should be looped within the same focus group.<br>
 500         /// The focus movement is not looped by default.<br>
 501         /// </summary>
 502         public bool FocusGroupLoop
 503         {
 504             set
 505             {
 506                 SetFocusGroupLoop(value);
 507             }
 508             get
 509             {
 510                 return GetFocusGroupLoop();
 511             }
 512         }
 513
 514         internal void SetFocusGroupLoop(bool enabled)
 515         {
 516             NDalicManualPINVOKE.FocusManager_SetFocusGroupLoop(swigCPtr, enabled);
 517             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 518         }
 519
 520         internal bool GetFocusGroupLoop()
 521         {
 522             bool ret = NDalicManualPINVOKE.FocusManager_GetFocusGroupLoop(swigCPtr);
 523             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 524             return ret;
 525         }
 526
 527         /// <summary>
 528         /// Sets whether an View is a focus group that can limit the scope of focus movement to its child views in the focus chain.<br>
 529         /// Layout controls set themselves as focus groups by default.<br>
 530         /// </summary>
 531         /// <param name="view">The View to be set as a focus group</param>
 532         /// <param name="isFocusGroup">Whether to set the View as a focus group or not</param>
 533         public void SetAsFocusGroup(View view, bool isFocusGroup)
 534         {
 535             NDalicManualPINVOKE.FocusManager_SetAsFocusGroup(swigCPtr, View.getCPtr(view), isFocusGroup);
 536             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 537         }
 538
 539         /// <summary>
 540         /// Checks whether the view is set as a focus group or not.
 541         /// </summary>
 542         /// <param name="view">The View to be checked</param>
 543         /// <returns>Whether the View is set as a focus group</returns>
 544         public bool IsFocusGroup(View view)
 545         {
 546             bool ret = NDalicManualPINVOKE.FocusManager_IsFocusGroup(swigCPtr, View.getCPtr(view));
 547             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 548             return ret;
 549         }
 550
 551         /// <summary>
 552         /// Returns the closest ancestor of the given view that is a focus group.
 553         /// </summary>
 554         /// <param name="view">The View to be checked for its focus group</param>
 555         /// <returns>The focus group the given view belongs to or an empty handle if the given view</returns>
 556         public View GetFocusGroup(View view)
 557         {
 558             View ret = new View(NDalicManualPINVOKE.FocusManager_GetFocusGroup(swigCPtr, View.getCPtr(view)), true);
 559             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 560             if (ret.HasBody() == false)
 561             {
 562                 return null;
 563             }
 564             return ret;
 565         }
 566
 567         /// <summary>
 568         /// Sets/Gets the focus indicator View.<br>
 569         /// This will replace the default focus indicator view in FocusManager and will be added to the focused view as a highlight.<br>
 570         /// </summary>
 571         public View FocusIndicator
 572         {
 573             set
 574             {
 575                 SetFocusIndicatorView(value);
 576             }
 577             get
 578             {
 579                 return GetFocusIndicatorView();
 580             }
 581         }
 582
 583         internal void SetFocusIndicatorView(View indicator)
 584         {
 585             NDalicManualPINVOKE.FocusManager_SetFocusIndicatorActor(swigCPtr, View.getCPtr(indicator));
 586             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 587         }
 588
 589         internal View GetFocusIndicatorView()
 590         {
 591             View ret = new View(NDalicManualPINVOKE.FocusManager_GetFocusIndicatorActor(swigCPtr), true);
 592             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 593             if (ret.HasBody() == false)
 594             {
 595                 return null;
 596             }
 597             return ret;
 598         }
 599
 600         /// <summary>
 601         /// Provide the implementation of custom Focus algorithm interface to allow the app define the focus logic.<br>
 602         /// </summary>
 603         /// <param name="arg0">The user's implementation of ICustomFocusAlgorithm</param>
 604         public void SetCustomAlgorithm(ICustomFocusAlgorithm arg0)
 605         {
 606             _customAlgorithmInterfaceWrapper = new CustomAlgorithmInterfaceWrapper();
 607             _customAlgorithmInterfaceWrapper.SetFocusAlgorithm(arg0);
 608
 609             NDalicPINVOKE.SetCustomAlgorithm(swigCPtr, CustomAlgorithmInterface.getCPtr(_customAlgorithmInterfaceWrapper));
 610             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 611         }
 612
 613         internal PreFocusChangeSignal PreFocusChangeSignal()
 614         {
 615             PreFocusChangeSignal ret = new PreFocusChangeSignal(NDalicManualPINVOKE.FocusManager_PreFocusChangeSignal(swigCPtr), false);
 616             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 617             return ret;
 618         }
 619
 620         internal FocusChangedSignal FocusChangedSignal()
 621         {
 622             FocusChangedSignal ret = new FocusChangedSignal(NDalicManualPINVOKE.FocusManager_FocusChangedSignal(swigCPtr), false);
 623             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 624             return ret;
 625         }
 626
 627         internal FocusGroupChangedSignal FocusGroupChangedSignal()
 628         {
 629             FocusGroupChangedSignal ret = new FocusGroupChangedSignal(NDalicManualPINVOKE.FocusManager_FocusGroupChangedSignal(swigCPtr), false);
 630             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 631             return ret;
 632         }
 633
 634         internal ViewSignal FocusedViewEnterKeySignal()
 635         {
 636             ViewSignal ret = new ViewSignal(NDalicManualPINVOKE.FocusManager_FocusedActorEnterKeySignal(swigCPtr), false);
 637             if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
 638             return ret;
 639         }
 640
 641         private static readonly FocusManager instance = FocusManager.Get();
 642
 643         /// <summary>
 644         /// Gets the singleton of FocusManager object.
 645         /// </summary>
 646         public static FocusManager Instance
 647         {
 648             get
 649             {
 650                 return instance;
 651             }
 652         }
 653
 654         /// <summary>
 655         /// ICustomFocusAlgorithm is used to provide custom keyboard focus algorithm for retrieving the next focusable view.<br>
 656         /// The application can implement the interface and override the keyboard focus behaviour.<br>
 657         /// If focus is changing within a layout container, then the layout container is queried first to provide the next focusable view.<br>
 658         /// If this does not provide a valid view, then the Keyboard FocusManager will check focusable properties to determine next focusable actor.<br>
 659         /// If focusable properties are not set, then the Keyboard FocusManager calls the GetNextFocusableView() method of this interface.<br>
 660         /// </summary>
 661         public interface ICustomFocusAlgorithm
 662         {
 663             View GetNextFocusableView(View current, View proposed, View.FocusDirection direction);
 664         }
 665
 666         private class CustomAlgorithmInterfaceWrapper : CustomAlgorithmInterface
 667         {
 668             private FocusManager.ICustomFocusAlgorithm _customFocusAlgorithm;
 669
 670             public CustomAlgorithmInterfaceWrapper()
 671             {
 672             }
 673
 674             public void SetFocusAlgorithm(FocusManager.ICustomFocusAlgorithm customFocusAlgorithm)
 675             {
 676                 _customFocusAlgorithm = customFocusAlgorithm;
 677             }
 678
 679             public override View GetNextFocusableView(View current, View proposed, View.FocusDirection direction)
 680             {
 681                 View currentView = View.DownCast<View>(current);
 682                 View proposedView = View.DownCast<View>(proposed);
 683                 return _customFocusAlgorithm.GetNextFocusableView(currentView, proposedView, direction);
 684             }
 685         }
 686     }
 687 }