base/dali-toolkit/internal/controls/scrollable/item-view/item-view-impl.cpp

   1 /*
   2  * Copyright (c) 2014 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-toolkit/internal/controls/scrollable/item-view/item-view-impl.h>
  20
  21 // EXTERNAL INCLUDES
  22 #include <algorithm>
  23
  24 // INTERNAL INCLUDES
  25 #include <dali/public-api/events/mouse-wheel-event.h>
  26 #include <dali-toolkit/public-api/controls/scrollable/item-view/item-factory.h>
  27 #include <dali-toolkit/internal/controls/scrollable/scroll-connector-impl.h>
  28 #include <dali-toolkit/public-api/controls/default-controls/solid-color-actor.h>
  29
  30 using namespace std;
  31 using namespace Dali;
  32
  33 namespace // unnamed namespace
  34 {
  35
  36 //Type registration
  37 TypeRegistration mType( typeid(Toolkit::ItemView), typeid(Toolkit::Scrollable), NULL );
  38
  39 const float DEFAULT_MINIMUM_SWIPE_SPEED = 1.0f;
  40 const float DEFAULT_MINIMUM_SWIPE_DISTANCE = 3.0f;
  41 const float DEFAULT_MOUSE_WHEEL_SCROLL_DISTANCE_STEP_PROPORTION = 0.1f;
  42
  43 const float DEFAULT_REFRESH_INTERVAL_LAYOUT_POSITIONS = 20.0f; // 1 updates per 20 items
  44 const int MOUSE_WHEEL_EVENT_FINISHED_TIME_OUT = 500;  // 0.5 second
  45
  46 const float DEFAULT_ANCHORING_DURATION = 1.0f;  // 1 second
  47 const float DEFAULT_COLOR_VISIBILITY_REMOVE_TIME = 0.5f; // 0.5 second
  48
  49 const float MILLISECONDS_PER_SECONDS = 1000.0f;
  50
  51 const Rect<int> OVERSHOOT_BOUNCE_IMAGE_1_PIXEL_AREA( 0, 0, 720, 58 );
  52 const Vector4 OVERSHOOT_OVERLAY_NINE_PATCH_BORDER(0.0f, 0.0f, 1.0f, 12.0f);
  53 const float MAXIMUM_OVERSHOOT_HEIGHT = 36.0f;  // 36 pixels
  54 const float DEFAULT_OVERSHOOT_ANIMATION_DURATION = 0.5f;  // 0.5 second
  55 const float DEFAULT_KEYBOARD_FOCUS_SCROLL_DURATION = 0.2f;
  56
  57 const string LAYOUT_POSITION_PROPERTY_NAME( "item-view-layout-position" );
  58 const string POSITION_PROPERTY_NAME( "item-view-position" );
  59 const string MINIMUM_LAYOUT_POSITION_PROPERTY_NAME( "item-view-minimum-layout-position" );
  60 const string SCROLL_SPEED_PROPERTY_NAME( "item-view-scroll-speed" );
  61 const string SCROLL_DIRECTION_PROPERTY_NAME( "item-view-scroll-direction" );
  62 const string OVERSHOOT_PROPERTY_NAME( "item-view-overshoot" );
  63
  64 // Functors which wrap constraint functions with stored item IDs
  65
  66 struct WrappedVector3Constraint
  67 {
  68   WrappedVector3Constraint(Toolkit::ItemLayout::Vector3Function wrapMe, unsigned int itemId)
  69   : mWrapMe(wrapMe),
  70     mItemId(itemId)
  71   {
  72   }
  73
  74   Vector3 operator()(const Vector3& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
  75   {
  76     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
  77
  78     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
  79   }
  80
  81   Toolkit::ItemLayout::Vector3Function mWrapMe;
  82   unsigned int mItemId;
  83 };
  84
  85 struct WrappedQuaternionConstraint
  86 {
  87   WrappedQuaternionConstraint(Toolkit::ItemLayout::QuaternionFunction wrapMe, unsigned int itemId)
  88   : mWrapMe(wrapMe),
  89     mItemId(itemId)
  90   {
  91   }
  92
  93   Quaternion operator()(const Quaternion& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
  94   {
  95     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
  96
  97     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
  98   }
  99
 100   Toolkit::ItemLayout::QuaternionFunction mWrapMe;
 101   unsigned int mItemId;
 102 };
 103
 104 struct WrappedVector4Constraint
 105 {
 106   WrappedVector4Constraint(Toolkit::ItemLayout::Vector4Function wrapMe, unsigned int itemId)
 107   : mWrapMe(wrapMe),
 108     mItemId(itemId)
 109   {
 110   }
 111
 112   Vector4 operator()(const Vector4& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
 113   {
 114     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
 115
 116     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
 117   }
 118
 119   Toolkit::ItemLayout::Vector4Function mWrapMe;
 120   unsigned int mItemId;
 121 };
 122
 123 struct WrappedBoolConstraint
 124 {
 125   WrappedBoolConstraint(Toolkit::ItemLayout::BoolFunction wrapMe, unsigned int itemId)
 126   : mWrapMe(wrapMe),
 127     mItemId(itemId)
 128   {
 129   }
 130
 131   bool operator()(const bool& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
 132   {
 133     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
 134
 135     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
 136   }
 137
 138   Toolkit::ItemLayout::BoolFunction mWrapMe;
 139   unsigned int mItemId;
 140 };
 141
 142 /**
 143  * Local helper to convert pan distance (in actor coordinates) to the layout-specific scrolling direction
 144  */
 145 float CalculateScrollDistance(Vector2 panDistance, Toolkit::ItemLayout& layout)
 146 {
 147   Radian scrollDirection(layout.GetScrollDirection());
 148
 149   float cosTheta = cosf(scrollDirection);
 150   float sinTheta = sinf(scrollDirection);
 151
 152   return panDistance.x * sinTheta + panDistance.y * cosTheta;
 153 }
 154
 155 // Overshoot overlay constraints
 156
 157 struct OvershootOverlaySizeConstraint
 158 {
 159   float operator()(const float& current,
 160                      const PropertyInput& parentScrollDirectionProperty,
 161                      const PropertyInput& parentOvershootProperty,
 162                      const PropertyInput& parentSizeProperty)
 163   {
 164     const Vector3 parentScrollDirection = parentScrollDirectionProperty.GetVector3();
 165     const Vector3 parentSize = parentSizeProperty.GetVector3();
 166     const Toolkit::ControlOrientation::Type& parentOrientation = static_cast<Toolkit::ControlOrientation::Type>(parentScrollDirection.z);
 167
 168     float overlayWidth;
 169
 170     if(Toolkit::IsVertical(parentOrientation))
 171     {
 172       overlayWidth = fabsf(parentScrollDirection.y) > Math::MACHINE_EPSILON_1 ? parentSize.x : parentSize.y;
 173     }
 174     else
 175     {
 176       overlayWidth = fabsf(parentScrollDirection.x) > Math::MACHINE_EPSILON_1 ? parentSize.y : parentSize.x;
 177     }
 178
 179     return overlayWidth;
 180   }
 181 };
 182
 183 struct OvershootOverlayRotationConstraint
 184 {
 185   Quaternion operator()(const Quaternion& current,
 186                         const PropertyInput& parentScrollDirectionProperty,
 187                         const PropertyInput& parentOvershootProperty)
 188   {
 189     const Vector3 parentScrollDirection = parentScrollDirectionProperty.GetVector3();
 190     const float parentOvershoot = parentOvershootProperty.GetFloat();
 191     const Toolkit::ControlOrientation::Type& parentOrientation = static_cast<Toolkit::ControlOrientation::Type>(parentScrollDirection.z);
 192
 193     Quaternion rotation;
 194
 195     if(Toolkit::IsVertical(parentOrientation))
 196     {
 197       if(fabsf(parentScrollDirection.y) <= Math::MACHINE_EPSILON_1)
 198       {
 199         if( (parentOrientation == Toolkit::ControlOrientation::Up && parentOvershoot < Math::MACHINE_EPSILON_0)
 200             || (parentOrientation == Toolkit::ControlOrientation::Down && parentOvershoot > Math::MACHINE_EPSILON_0) )
 201         {
 202           rotation = Quaternion(0.5f * Math::PI, Vector3::ZAXIS);
 203         }
 204         else
 205         {
 206           rotation = Quaternion(1.5f * Math::PI, Vector3::ZAXIS);
 207         }
 208       }
 209       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.y > Math::MACHINE_EPSILON_0)
 210             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.y < Math::MACHINE_EPSILON_0) )
 211       {
 212         rotation = Quaternion(0.0f, Vector3::ZAXIS);
 213       }
 214       else
 215       {
 216         rotation = Quaternion(Math::PI, Vector3::ZAXIS);
 217       }
 218     }
 219     else
 220     {
 221       if(fabsf(parentScrollDirection.x) <= Math::MACHINE_EPSILON_1)
 222       {
 223         if( (parentOrientation == Toolkit::ControlOrientation::Left && parentOvershoot > Math::MACHINE_EPSILON_0)
 224             ||(parentOrientation == Toolkit::ControlOrientation::Right && parentOvershoot < Math::MACHINE_EPSILON_0) )
 225         {
 226           rotation = Quaternion(Math::PI, Vector3::ZAXIS);
 227         }
 228         else
 229         {
 230           rotation = Quaternion(0.0f, Vector3::ZAXIS);
 231         }
 232       }
 233       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.x > Math::MACHINE_EPSILON_0)
 234             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.x < Math::MACHINE_EPSILON_0) )
 235       {
 236         rotation = Quaternion(1.5f * Math::PI, Vector3::ZAXIS);
 237       }
 238       else
 239       {
 240         rotation = Quaternion(0.5f * Math::PI, Vector3::ZAXIS);
 241       }
 242     }
 243
 244     return rotation;
 245   }
 246 };
 247
 248 struct OvershootOverlayPositionConstraint
 249 {
 250   Vector3 operator()(const Vector3&    current,
 251                      const PropertyInput& parentSizeProperty,
 252                      const PropertyInput& parentScrollDirectionProperty,
 253                      const PropertyInput& parentOvershootProperty)
 254   {
 255     const Vector3 parentScrollDirection = parentScrollDirectionProperty.GetVector3();
 256     const float parentOvershoot = parentOvershootProperty.GetFloat();
 257     const Vector3 parentSize = parentSizeProperty.GetVector3();
 258     const Toolkit::ControlOrientation::Type& parentOrientation = static_cast<Toolkit::ControlOrientation::Type>(parentScrollDirection.z);
 259
 260     Vector3 relativeOffset;
 261
 262     if(Toolkit::IsVertical(parentOrientation))
 263     {
 264       if(fabsf(parentScrollDirection.y) <= Math::MACHINE_EPSILON_1)
 265       {
 266         if( (parentOrientation == Toolkit::ControlOrientation::Up && parentOvershoot < Math::MACHINE_EPSILON_0)
 267             || (parentOrientation == Toolkit::ControlOrientation::Down && parentOvershoot > Math::MACHINE_EPSILON_0) )
 268         {
 269           relativeOffset = Vector3(1.0f, 0.0f, 0.0f);
 270         }
 271         else
 272         {
 273           relativeOffset =Vector3(0.0f, 1.0f, 0.0f);
 274         }
 275       }
 276       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.y > Math::MACHINE_EPSILON_0)
 277             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.y < Math::MACHINE_EPSILON_0) )
 278       {
 279         relativeOffset = Vector3(0.0f, 0.0f, 0.0f);
 280       }
 281       else
 282       {
 283         relativeOffset = Vector3(1.0f, 1.0f, 0.0f);
 284       }
 285     }
 286     else
 287     {
 288       if(fabsf(parentScrollDirection.x) <= Math::MACHINE_EPSILON_1)
 289       {
 290         if( (parentOrientation == Toolkit::ControlOrientation::Left && parentOvershoot < Math::MACHINE_EPSILON_0)
 291             || (parentOrientation == Toolkit::ControlOrientation::Right && parentOvershoot > Math::MACHINE_EPSILON_0) )
 292         {
 293           relativeOffset = Vector3(0.0f, 0.0f, 0.0f);
 294         }
 295         else
 296         {
 297           relativeOffset = Vector3(1.0f, 1.0f, 0.0f);
 298         }
 299       }
 300       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.x > Math::MACHINE_EPSILON_0)
 301             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.x < Math::MACHINE_EPSILON_0) )
 302       {
 303         relativeOffset = Vector3(0.0f, 1.0f, 0.0f);
 304       }
 305       else
 306       {
 307         relativeOffset = Vector3(1.0f, 0.0f, 0.0f);
 308       }
 309     }
 310
 311     return relativeOffset * parentSize;
 312
 313   }
 314 };
 315
 316 struct OvershootOverlayVisibilityConstraint
 317 {
 318   bool operator()(const bool& current,
 319                   const PropertyInput& parentLayoutScrollableProperty)
 320   {
 321     const bool parentLayoutScrollable = parentLayoutScrollableProperty.GetBoolean();
 322
 323     return parentLayoutScrollable;
 324   }
 325 };
 326
 327 /**
 328  * Relative position Constraint
 329  * Generates the relative position value of the item view based on the layout position,
 330  * and it's relation to the layout domain. This is a value from 0.0f to 1.0f in each axis.
 331  */
 332 Vector3 RelativePositionConstraint(const Vector3& current,
 333                                    const PropertyInput& scrollPositionProperty,
 334                                    const PropertyInput& scrollMinProperty,
 335                                    const PropertyInput& scrollMaxProperty,
 336                                    const PropertyInput& layoutSizeProperty)
 337 {
 338   const Vector3& position = Vector3(0.0f, scrollPositionProperty.GetFloat(), 0.0f);
 339   const Vector3& min = scrollMinProperty.GetVector3();
 340   const Vector3& max = scrollMaxProperty.GetVector3();
 341
 342   Vector3 relativePosition;
 343   Vector3 domainSize = max - min;
 344
 345   relativePosition.x = fabsf(domainSize.x) > Math::MACHINE_EPSILON_1 ? ((min.x - position.x) / fabsf(domainSize.x)) : 0.0f;
 346   relativePosition.y = fabsf(domainSize.y) > Math::MACHINE_EPSILON_1 ? ((min.y - position.y) / fabsf(domainSize.y)) : 0.0f;
 347
 348   return relativePosition;
 349 }
 350
 351 } // unnamed namespace
 352
 353 namespace Dali
 354 {
 355
 356 namespace Toolkit
 357 {
 358
 359 namespace Internal
 360 {
 361
 362 namespace // unnamed namespace
 363 {
 364
 365 bool FindById( const ItemContainer& items, ItemId id )
 366 {
 367   for( ConstItemIter iter = items.begin(); items.end() != iter; ++iter )
 368   {
 369     if( iter->first == id )
 370     {
 371       return true;
 372     }
 373   }
 374
 375   return false;
 376 }
 377
 378 } // unnamed namespace
 379
 380 Dali::Toolkit::ItemView ItemView::New(ItemFactory& factory)
 381 {
 382   // Create the implementation
 383   ItemViewPtr itemView(new ItemView(factory));
 384
 385   // Pass ownership to CustomActor via derived handle
 386   Dali::Toolkit::ItemView handle(*itemView);
 387
 388   // Second-phase init of the implementation
 389   // This can only be done after the CustomActor connection has been made...
 390   itemView->Initialize();
 391
 392   return handle;
 393 }
 394
 395 ItemView::ItemView(ItemFactory& factory)
 396 : Scrollable(),
 397   mItemFactory(factory),
 398   mActiveLayout(NULL),
 399   mDefaultAlphaFunction(Dali::Constraint::DEFAULT_ALPHA_FUNCTION),
 400   mAnimatingOvershootOn(false),
 401   mAnimateOvershootOff(false),
 402   mAnchoringEnabled(true),
 403   mAnchoringDuration(DEFAULT_ANCHORING_DURATION),
 404   mRefreshIntervalLayoutPositions(DEFAULT_REFRESH_INTERVAL_LAYOUT_POSITIONS),
 405   mRefreshOrderHint(true/*Refresh item 0 first*/),
 406   mMinimumSwipeSpeed(DEFAULT_MINIMUM_SWIPE_SPEED),
 407   mMinimumSwipeDistance(DEFAULT_MINIMUM_SWIPE_DISTANCE),
 408   mScrollDistance(0.0f),
 409   mScrollSpeed(0.0f),
 410   mTotalPanDisplacement(Vector2::ZERO),
 411   mScrollOvershoot(0.0f),
 412   mIsFlicking(false),
 413   mGestureState(Gesture::Clear),
 414   mAddingItems(false),
 415   mRefreshEnabled(true),
 416   mItemsParentOrigin( ParentOrigin::CENTER),
 417   mItemsAnchorPoint( AnchorPoint::CENTER)
 418 {
 419   SetRequiresMouseWheelEvents(true);
 420   SetKeyboardNavigationSupport(true);
 421 }
 422
 423 void ItemView::OnInitialize()
 424 {
 425   SetSizePolicy( Toolkit::Control::Fixed, Toolkit::Control::Fixed );
 426
 427   RegisterCommonProperties();
 428
 429   Actor self = Self();
 430
 431   mScrollConnector = Dali::Toolkit::ScrollConnector::New();
 432   mScrollPositionObject = mScrollConnector.GetScrollPositionObject();
 433
 434   mPropertyMinimumLayoutPosition = self.RegisterProperty(MINIMUM_LAYOUT_POSITION_PROPERTY_NAME, 0.0f);
 435   mPropertyPosition = self.RegisterProperty(POSITION_PROPERTY_NAME, 0.0f);
 436   mPropertyScrollSpeed = self.RegisterProperty(SCROLL_SPEED_PROPERTY_NAME, 0.0f);
 437
 438   EnableScrollComponent(Toolkit::Scrollable::OvershootIndicator);
 439
 440   Constraint constraint = Constraint::New<Vector3>(mPropertyRelativePosition,
 441                                                    LocalSource(mPropertyPosition),
 442                                                    LocalSource(mPropertyPositionMin),
 443                                                    LocalSource(mPropertyPositionMax),
 444                                                    LocalSource(Actor::SIZE),
 445                                                    RelativePositionConstraint);
 446   self.ApplyConstraint(constraint);
 447
 448   Vector2 stageSize = Stage::GetCurrent().GetSize();
 449   mMouseWheelScrollDistanceStep = stageSize.y * DEFAULT_MOUSE_WHEEL_SCROLL_DISTANCE_STEP_PROPORTION;
 450
 451   EnableGestureDetection(Gesture::Type(Gesture::Pan));
 452
 453   mMouseWheelEventFinishedTimer = Timer::New( MOUSE_WHEEL_EVENT_FINISHED_TIME_OUT );
 454   mMouseWheelEventFinishedTimer.TickSignal().Connect( this, &ItemView::OnMouseWheelEventFinished );
 455
 456   SetRefreshInterval(mRefreshIntervalLayoutPositions);
 457 }
 458
 459 ItemView::~ItemView()
 460 {
 461 }
 462
 463 Dali::Toolkit::ScrollConnector ItemView::GetScrollConnector() const
 464 {
 465   return mScrollConnector;
 466 }
 467
 468 unsigned int ItemView::GetLayoutCount() const
 469 {
 470   return mLayouts.size();
 471 }
 472
 473 void ItemView::AddLayout(ItemLayout& layout)
 474 {
 475   mLayouts.push_back(ItemLayoutPtr(&layout));
 476 }
 477
 478 void ItemView::RemoveLayout(unsigned int layoutIndex)
 479 {
 480   DALI_ASSERT_ALWAYS(layoutIndex < mLayouts.size());
 481
 482   if (mActiveLayout == mLayouts[layoutIndex].Get())
 483   {
 484     mActiveLayout = NULL;
 485   }
 486
 487   mLayouts.erase(mLayouts.begin() + layoutIndex);
 488 }
 489
 490 ItemLayoutPtr ItemView::GetLayout(unsigned int layoutIndex) const
 491 {
 492   return mLayouts[layoutIndex];
 493 }
 494
 495 ItemLayoutPtr ItemView::GetActiveLayout() const
 496 {
 497   return ItemLayoutPtr(mActiveLayout);
 498 }
 499
 500 float ItemView::GetCurrentLayoutPosition(unsigned int itemId) const
 501 {
 502   return mScrollPositionObject.GetProperty<float>( ScrollConnector::SCROLL_POSITION ) + static_cast<float>( itemId );
 503 }
 504
 505 void ItemView::ActivateLayout(unsigned int layoutIndex, const Vector3& targetSize, float durationSeconds)
 506 {
 507   DALI_ASSERT_ALWAYS(layoutIndex < mLayouts.size());
 508
 509   Actor self = Self();
 510
 511   // The ItemView size should match the active layout size
 512   self.SetSize(targetSize);
 513   mActiveLayoutTargetSize = targetSize;
 514
 515   // Switch to the new layout
 516   mActiveLayout = mLayouts[layoutIndex].Get();
 517
 518   // Move the items to the new layout positions...
 519
 520   bool resizeAnimationNeeded(false);
 521
 522   for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 523   {
 524     unsigned int itemId = iter->first;
 525     Actor actor = iter->second;
 526
 527     // Remove constraints from previous layout
 528     actor.RemoveConstraints();
 529
 530     Vector3 size;
 531     if(mActiveLayout->GetItemSize(itemId, targetSize, size))
 532     {
 533       if( durationSeconds > 0.0f )
 534       {
 535         // Use a size animation
 536         if (!resizeAnimationNeeded)
 537         {
 538           resizeAnimationNeeded = true;
 539           RemoveAnimation(mResizeAnimation);
 540           mResizeAnimation = Animation::New(durationSeconds);
 541         }
 542
 543         // The layout provides its own resize animation
 544         mActiveLayout->GetResizeAnimation(mResizeAnimation, actor, size, durationSeconds);
 545       }
 546       else
 547       {
 548         // resize immediately
 549         actor.SetSize(size);
 550       }
 551     }
 552
 553     ApplyConstraints(actor, *mActiveLayout, itemId, durationSeconds);
 554   }
 555
 556   if (resizeAnimationNeeded)
 557   {
 558     mResizeAnimation.Play();
 559   }
 560
 561   // Refresh the new layout
 562   ItemRange range = GetItemRange(*mActiveLayout, targetSize, GetCurrentLayoutPosition(0), true/*reserve extra*/);
 563   AddActorsWithinRange( range, durationSeconds );
 564
 565   // Scroll to an appropriate layout position
 566
 567   bool scrollAnimationNeeded(false);
 568   float firstItemScrollPosition(0.0f);
 569
 570   float current = GetCurrentLayoutPosition(0);
 571   float minimum = ClampFirstItemPosition(current, targetSize, *mActiveLayout);
 572   self.SetProperty(mPropertyPosition, GetScrollPosition(current, targetSize));
 573
 574   if (current < minimum)
 575   {
 576     scrollAnimationNeeded = true;
 577     firstItemScrollPosition = minimum;
 578   }
 579   else if (mAnchoringEnabled)
 580   {
 581     scrollAnimationNeeded = true;
 582     firstItemScrollPosition = mActiveLayout->GetClosestAnchorPosition(current);
 583   }
 584
 585   if (scrollAnimationNeeded)
 586   {
 587     RemoveAnimation(mScrollAnimation);
 588     mScrollAnimation = Animation::New(mAnchoringDuration);
 589     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
 590     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, targetSize), AlphaFunctions::EaseOut );
 591     mScrollAnimation.Play();
 592   }
 593
 594   self.SetProperty(mPropertyMinimumLayoutPosition, mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), targetSize));
 595   AnimateScrollOvershoot(0.0f);
 596   mScrollOvershoot = 0.0f;
 597
 598   Radian scrollDirection(mActiveLayout->GetScrollDirection());
 599   float orientation = static_cast<float>(mActiveLayout->GetOrientation());
 600   self.SetProperty(mPropertyScrollDirection, Vector3(sinf(scrollDirection), cosf(scrollDirection), orientation));
 601
 602   self.SetProperty(mPropertyScrollSpeed, mScrollSpeed);
 603
 604   CalculateDomainSize(targetSize);
 605 }
 606
 607 void ItemView::DeactivateCurrentLayout()
 608 {
 609   if (mActiveLayout)
 610   {
 611     for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 612     {
 613       Actor actor = iter->second;
 614       actor.RemoveConstraints();
 615     }
 616
 617     mActiveLayout = NULL;
 618   }
 619 }
 620
 621 void ItemView::SetDefaultAlphaFunction(AlphaFunction func)
 622 {
 623   mDefaultAlphaFunction = func;
 624 }
 625
 626 AlphaFunction ItemView::GetDefaultAlphaFunction() const
 627 {
 628   return mDefaultAlphaFunction;
 629 }
 630
 631 void ItemView::OnRefreshNotification(PropertyNotification& source)
 632 {
 633   if(mRefreshEnabled)
 634   {
 635     // Only refresh the cache during normal scrolling
 636     DoRefresh(GetCurrentLayoutPosition(0), true);
 637   }
 638 }
 639
 640 void ItemView::DoRefresh(float currentLayoutPosition, bool cacheExtra)
 641 {
 642   if (mActiveLayout)
 643   {
 644     ItemRange range = GetItemRange(*mActiveLayout, mActiveLayoutTargetSize, currentLayoutPosition, cacheExtra/*reserve extra*/);
 645     RemoveActorsOutsideRange( range );
 646     AddActorsWithinRange( range, 0.0f/*immediate*/ );
 647
 648     mScrollUpdatedSignalV2.Emit( Vector3(0.0f, currentLayoutPosition, 0.0f) );
 649   }
 650 }
 651
 652 void ItemView::SetMinimumSwipeSpeed(float speed)
 653 {
 654   mMinimumSwipeSpeed = speed;
 655 }
 656
 657 float ItemView::GetMinimumSwipeSpeed() const
 658 {
 659   return mMinimumSwipeSpeed;
 660 }
 661
 662 void ItemView::SetMinimumSwipeDistance(float distance)
 663 {
 664   mMinimumSwipeDistance = distance;
 665 }
 666
 667 float ItemView::GetMinimumSwipeDistance() const
 668 {
 669   return mMinimumSwipeDistance;
 670 }
 671
 672 void ItemView::SetMouseWheelScrollDistanceStep(float step)
 673 {
 674   mMouseWheelScrollDistanceStep = step;
 675 }
 676
 677 float ItemView::GetMouseWheelScrollDistanceStep() const
 678 {
 679   return mMouseWheelScrollDistanceStep;
 680 }
 681
 682 void ItemView::SetAnchoring(bool enabled)
 683 {
 684   mAnchoringEnabled = enabled;
 685 }
 686
 687 bool ItemView::GetAnchoring() const
 688 {
 689   return mAnchoringEnabled;
 690 }
 691
 692 void ItemView::SetAnchoringDuration(float durationSeconds)
 693 {
 694   mAnchoringDuration = durationSeconds;
 695 }
 696
 697 float ItemView::GetAnchoringDuration() const
 698 {
 699   return mAnchoringDuration;
 700 }
 701
 702 void ItemView::SetRefreshInterval(float intervalLayoutPositions)
 703 {
 704   mRefreshIntervalLayoutPositions = intervalLayoutPositions;
 705
 706   if(mRefreshNotification)
 707   {
 708     mScrollPositionObject.RemovePropertyNotification(mRefreshNotification);
 709   }
 710   mRefreshNotification = mScrollPositionObject.AddPropertyNotification( ScrollConnector::SCROLL_POSITION, StepCondition(mRefreshIntervalLayoutPositions, 0.0f) );
 711   mRefreshNotification.NotifySignal().Connect( this, &ItemView::OnRefreshNotification );
 712 }
 713
 714 float ItemView::GetRefreshInterval() const
 715 {
 716   return mRefreshIntervalLayoutPositions;
 717 }
 718
 719 void ItemView::SetRefreshEnabled(bool enabled)
 720 {
 721   mRefreshEnabled = enabled;
 722 }
 723
 724 Actor ItemView::GetItem(unsigned int itemId) const
 725 {
 726   Actor actor;
 727
 728   ConstItemPoolIter iter = mItemPool.find( itemId );
 729   if( iter != mItemPool.end() )
 730   {
 731     actor = iter->second;
 732   }
 733
 734   return actor;
 735 }
 736
 737 unsigned int ItemView::GetItemId( Actor actor ) const
 738 {
 739   unsigned int itemId( 0 );
 740
 741   for ( ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter )
 742   {
 743     if( iter->second == actor )
 744     {
 745       itemId = iter->first;
 746       break;
 747     }
 748   }
 749
 750   return itemId;
 751 }
 752
 753 void ItemView::InsertItem( Item newItem, float durationSeconds )
 754 {
 755   mAddingItems = true;
 756
 757   SetupActor( newItem, durationSeconds );
 758   Self().Add( newItem.second );
 759
 760   ItemPoolIter foundIter = mItemPool.find( newItem.first );
 761   if( mItemPool.end() != foundIter )
 762   {
 763     Actor moveMe = foundIter->second;
 764     foundIter->second = newItem.second;
 765
 766     // Move the existing actors to make room
 767     for( ItemPoolIter iter = ++foundIter; mItemPool.end() != iter; ++iter )
 768     {
 769       Actor temp = iter->second;
 770       iter->second = moveMe;
 771       moveMe = temp;
 772
 773       iter->second.RemoveConstraints();
 774       ApplyConstraints( iter->second, *mActiveLayout, iter->first, durationSeconds );
 775     }
 776
 777     // Create last item
 778     ItemId lastId = mItemPool.rbegin()->first;
 779     Item lastItem( lastId + 1, moveMe );
 780     mItemPool.insert( lastItem );
 781
 782     lastItem.second.RemoveConstraints();
 783     ApplyConstraints( lastItem.second, *mActiveLayout, lastItem.first, durationSeconds );
 784   }
 785   else
 786   {
 787     mItemPool.insert( newItem );
 788   }
 789
 790   CalculateDomainSize(Self().GetCurrentSize());
 791
 792   mAddingItems = false;
 793 }
 794
 795 void ItemView::InsertItems( const ItemContainer& newItems, float durationSeconds )
 796 {
 797   mAddingItems = true;
 798
 799   // Insert from lowest id to highest
 800   set<Item> sortedItems;
 801   for( ConstItemIter iter = newItems.begin(); newItems.end() != iter; ++iter )
 802   {
 803     sortedItems.insert( *iter );
 804   }
 805
 806   for( set<Item>::iterator iter = sortedItems.begin(); sortedItems.end() != iter; ++iter )
 807   {
 808     Self().Add( iter->second );
 809
 810     cout << "inserting item: " << iter->first << endl;
 811
 812     ItemPoolIter foundIter = mItemPool.find( iter->first );
 813     if( mItemPool.end() != foundIter )
 814     {
 815       Actor moveMe = foundIter->second;
 816       foundIter->second = iter->second;
 817
 818       // Move the existing actors to make room
 819       for( ItemPoolIter iter = ++foundIter; mItemPool.end() != iter; ++iter )
 820       {
 821         Actor temp = iter->second;
 822         iter->second = moveMe;
 823         moveMe = temp;
 824       }
 825
 826       // Create last item
 827       ItemId lastId = mItemPool.rbegin()->first;
 828       Item lastItem( lastId + 1, moveMe );
 829       mItemPool.insert( lastItem );
 830     }
 831     else
 832     {
 833       mItemPool.insert( *iter );
 834     }
 835   }
 836
 837   // Relayout everything
 838   for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 839   {
 840     // If newly inserted
 841     if( FindById( newItems, iter->first ) )
 842     {
 843       SetupActor( *iter, durationSeconds );
 844     }
 845     else
 846     {
 847       iter->second.RemoveConstraints();
 848       ApplyConstraints( iter->second, *mActiveLayout, iter->first, durationSeconds );
 849     }
 850   }
 851
 852   CalculateDomainSize(Self().GetCurrentSize());
 853
 854   mAddingItems = false;
 855 }
 856
 857 void ItemView::RemoveItem( unsigned int itemId, float durationSeconds )
 858 {
 859   bool actorRemoved = RemoveActor( itemId );
 860   if( actorRemoved )
 861   {
 862     ReapplyAllConstraints( durationSeconds );
 863   }
 864 }
 865
 866 void ItemView::RemoveItems( const ItemIdContainer& itemIds, float durationSeconds )
 867 {
 868   bool actorRemoved( false );
 869
 870   // Remove from highest id to lowest
 871   set<ItemId> sortedItems;
 872   for( ConstItemIdIter iter = itemIds.begin(); itemIds.end() != iter; ++iter )
 873   {
 874     sortedItems.insert( *iter );
 875   }
 876
 877   for( set<ItemId>::reverse_iterator iter = sortedItems.rbegin(); sortedItems.rend() != iter; ++iter )
 878   {
 879     if( RemoveActor( *iter ) )
 880     {
 881       actorRemoved = true;
 882     }
 883   }
 884
 885   if( actorRemoved )
 886   {
 887     ReapplyAllConstraints( durationSeconds );
 888   }
 889 }
 890
 891 bool ItemView::RemoveActor(unsigned int itemId)
 892 {
 893   bool removed( false );
 894
 895   const ItemPoolIter removeIter = mItemPool.find( itemId );
 896
 897   if( removeIter != mItemPool.end() )
 898   {
 899     Self().Remove( removeIter->second );
 900     removed = true;
 901
 902     // Adjust the remaining item IDs, for example if item 2 is removed:
 903     //   Initial actors:     After insert:
 904     //     ID 1 - ActorA       ID 1 - ActorA
 905     //     ID 2 - ActorB       ID 2 - ActorC (previously ID 3)
 906     //     ID 3 - ActorC       ID 3 - ActorB (previously ID 4)
 907     //     ID 4 - ActorD
 908     for (ItemPoolIter iter = removeIter; iter != mItemPool.end(); ++iter)
 909     {
 910       if( iter->first < mItemPool.rbegin()->first )
 911       {
 912         iter->second = mItemPool[ iter->first + 1 ];
 913       }
 914       else
 915       {
 916         mItemPool.erase( iter );
 917         break;
 918       }
 919     }
 920   }
 921
 922   return removed;
 923 }
 924
 925 void ItemView::ReplaceItem( Item replacementItem, float durationSeconds )
 926 {
 927   mAddingItems = true;
 928
 929   SetupActor( replacementItem, durationSeconds );
 930   Self().Add( replacementItem.second );
 931
 932   const ItemPoolIter iter = mItemPool.find( replacementItem.first );
 933   if( mItemPool.end() != iter )
 934   {
 935     Self().Remove( iter->second );
 936     iter->second = replacementItem.second;
 937   }
 938   else
 939   {
 940     mItemPool.insert( replacementItem );
 941   }
 942
 943   CalculateDomainSize(Self().GetCurrentSize());
 944
 945   mAddingItems = false;
 946 }
 947
 948 void ItemView::ReplaceItems( const ItemContainer& replacementItems, float durationSeconds )
 949 {
 950   for( ConstItemIter iter = replacementItems.begin(); replacementItems.end() != iter; ++iter )
 951   {
 952     ReplaceItem( *iter, durationSeconds );
 953   }
 954 }
 955
 956 void ItemView::RemoveActorsOutsideRange( ItemRange range )
 957 {
 958   // Remove unwanted actors from the ItemView & ItemPool
 959   for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); )
 960   {
 961     unsigned int current = iter->first;
 962
 963     if( ! range.Within( current ) )
 964     {
 965       Self().Remove( iter->second );
 966
 967       mItemPool.erase( iter++ ); // erase invalidates the return value of post-increment; iter remains valid
 968     }
 969     else
 970     {
 971       ++iter;
 972     }
 973   }
 974 }
 975
 976 void ItemView::AddActorsWithinRange( ItemRange range, float durationSeconds )
 977 {
 978   range.end = min(mItemFactory.GetNumberOfItems(), range.end);
 979
 980   // The order of addition depends on the scroll direction.
 981   if (mRefreshOrderHint)
 982   {
 983     for (unsigned int itemId = range.begin; itemId < range.end; ++itemId)
 984     {
 985       AddNewActor( itemId, durationSeconds );
 986     }
 987   }
 988   else
 989   {
 990     for (unsigned int itemId = range.end; itemId > range.begin; --itemId)
 991     {
 992       AddNewActor( itemId-1, durationSeconds );
 993     }
 994   }
 995
 996   // Total number of items may change dynamically.
 997   // Always recalculate the domain size to reflect that.
 998   CalculateDomainSize(Self().GetCurrentSize());
 999 }
1000
1001 void ItemView::AddNewActor( unsigned int itemId, float durationSeconds )
1002 {
1003   mAddingItems = true;
1004
1005   if( mItemPool.end() == mItemPool.find( itemId ) )
1006   {
1007     Actor actor = mItemFactory.NewItem( itemId );
1008
1009     if( actor )
1010     {
1011       Item newItem( itemId, actor );
1012
1013       mItemPool.insert( newItem );
1014
1015       SetupActor( newItem, durationSeconds );
1016       Self().Add( actor );
1017     }
1018   }
1019
1020   mAddingItems = false;
1021 }
1022
1023 void ItemView::SetupActor( Item item, float durationSeconds )
1024 {
1025   item.second.SetParentOrigin( mItemsParentOrigin );
1026   item.second.SetAnchorPoint( mItemsAnchorPoint );
1027
1028   if( mActiveLayout )
1029   {
1030     Vector3 size;
1031     if( mActiveLayout->GetItemSize( item.first, mActiveLayoutTargetSize, size ) )
1032     {
1033       item.second.SetSize( size );
1034     }
1035
1036     ApplyConstraints( item.second, *mActiveLayout, item.first, durationSeconds );
1037   }
1038 }
1039
1040 ItemRange ItemView::GetItemRange(ItemLayout& layout, const Vector3& layoutSize, float layoutPosition, bool reserveExtra)
1041 {
1042   unsigned int itemCount = mItemFactory.GetNumberOfItems();
1043
1044   ItemRange available(0u, itemCount);
1045
1046   ItemRange range = layout.GetItemsWithinArea( layoutPosition, layoutSize );
1047
1048   if (reserveExtra)
1049   {
1050     // Add the reserve items for scrolling
1051     unsigned int extra = layout.GetReserveItemCount(layoutSize);
1052     range.begin = (range.begin >= extra) ? (range.begin - extra) : 0u;
1053     range.end += extra;
1054   }
1055
1056   return range.Intersection(available);
1057 }
1058
1059 void ItemView::OnChildAdd(Actor& child)
1060 {
1061   if(!mAddingItems)
1062   {
1063     // We don't want to do this downcast check for any item added by ItemView itself.
1064     Dali::Toolkit::ScrollComponent scrollComponent = Dali::Toolkit::ScrollComponent::DownCast(child);
1065     if(scrollComponent)
1066     {
1067       // Set the scroll connector when scroll bar is being added
1068       scrollComponent.SetScrollConnector(mScrollConnector);
1069     }
1070   }
1071 }
1072
1073 bool ItemView::OnTouchEvent(const TouchEvent& event)
1074 {
1075   // Ignore events with multiple-touch points
1076   if (event.GetPointCount() != 1)
1077   {
1078     return false;
1079   }
1080
1081   if (event.GetPoint(0).state == TouchPoint::Down)
1082   {
1083     // Cancel ongoing scrolling etc.
1084     mGestureState = Gesture::Clear;
1085
1086     mScrollDistance = 0.0f;
1087     mScrollSpeed = 0.0f;
1088     Self().SetProperty(mPropertyScrollSpeed, mScrollSpeed);
1089
1090     mScrollOvershoot = 0.0f;
1091     AnimateScrollOvershoot(0.0f);
1092
1093     mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1094
1095     RemoveAnimation(mScrollAnimation);
1096   }
1097
1098   return true; // consume since we're potentially scrolling
1099 }
1100
1101 bool ItemView::OnMouseWheelEvent(const MouseWheelEvent& event)
1102 {
1103   // Respond the mouse wheel event to scroll
1104   if (mActiveLayout)
1105   {
1106     Actor self = Self();
1107     const Vector3 layoutSize = Self().GetCurrentSize();
1108     float layoutPositionDelta = GetCurrentLayoutPosition(0) - (event.z * mMouseWheelScrollDistanceStep * mActiveLayout->GetScrollSpeedFactor());
1109     float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
1110
1111     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1112     self.SetProperty(mPropertyPosition, GetScrollPosition(firstItemScrollPosition, layoutSize));
1113     mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1114   }
1115
1116   if (mMouseWheelEventFinishedTimer.IsRunning())
1117   {
1118     mMouseWheelEventFinishedTimer.Stop();
1119   }
1120
1121   mMouseWheelEventFinishedTimer.Start();
1122
1123   return true;
1124 }
1125
1126 bool ItemView::OnMouseWheelEventFinished()
1127 {
1128   if (mActiveLayout)
1129   {
1130     RemoveAnimation(mScrollAnimation);
1131
1132     // No more mouse wheel events coming. Do the anchoring if enabled.
1133     mScrollAnimation = DoAnchoring();
1134     if (mScrollAnimation)
1135     {
1136       mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1137       mScrollAnimation.Play();
1138     }
1139     else
1140     {
1141       mScrollOvershoot = 0.0f;
1142       AnimateScrollOvershoot(0.0f);
1143
1144       mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1145     }
1146   }
1147
1148   return false;
1149 }
1150
1151 void ItemView::ApplyConstraints(Actor& actor, ItemLayout& layout, unsigned int itemId, float duration)
1152 {
1153   ItemLayout::Vector3Function positionConstraint;
1154   if (layout.GetPositionConstraint(itemId, positionConstraint))
1155   {
1156     WrappedVector3Constraint wrapped(positionConstraint, itemId);
1157
1158     Constraint constraint = Constraint::New<Vector3>( Actor::POSITION,
1159                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1160                                                       ParentSource( mPropertyScrollSpeed ),
1161                                                       ParentSource( Actor::SIZE ),
1162                                                       wrapped );
1163     constraint.SetApplyTime(duration);
1164     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1165
1166     actor.ApplyConstraint(constraint);
1167   }
1168
1169   ItemLayout::QuaternionFunction rotationConstraint;
1170   if (layout.GetRotationConstraint(itemId, rotationConstraint))
1171   {
1172     WrappedQuaternionConstraint wrapped(rotationConstraint, itemId);
1173
1174     Constraint constraint = Constraint::New<Quaternion>( Actor::ROTATION,
1175                                                          Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1176                                                          ParentSource( mPropertyScrollSpeed ),
1177                                                          ParentSource( Actor::SIZE ),
1178                                                          wrapped );
1179     constraint.SetApplyTime(duration);
1180     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1181
1182     actor.ApplyConstraint(constraint);
1183   }
1184
1185   ItemLayout::Vector3Function scaleConstraint;
1186   if (layout.GetScaleConstraint(itemId, scaleConstraint))
1187   {
1188     WrappedVector3Constraint wrapped(scaleConstraint, itemId);
1189
1190     Constraint constraint = Constraint::New<Vector3>( Actor::SCALE,
1191                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1192                                                       ParentSource( mPropertyScrollSpeed ),
1193                                                       ParentSource( Actor::SIZE ),
1194                                                       wrapped );
1195     constraint.SetApplyTime(duration);
1196     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1197
1198     actor.ApplyConstraint(constraint);
1199   }
1200
1201   ItemLayout::Vector4Function colorConstraint;
1202   if (layout.GetColorConstraint(itemId, colorConstraint))
1203   {
1204     WrappedVector4Constraint wrapped(colorConstraint, itemId);
1205
1206     Constraint constraint = Constraint::New<Vector4>( Actor::COLOR,
1207                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1208                                                       ParentSource( mPropertyScrollSpeed ),
1209                                                       ParentSource( Actor::SIZE ),
1210                                                       wrapped );
1211     constraint.SetApplyTime(duration);
1212     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1213
1214     // Release color constraints slowly; this allows ItemView to co-exist with ImageActor fade-in
1215     constraint.SetRemoveTime(DEFAULT_COLOR_VISIBILITY_REMOVE_TIME);
1216     constraint.SetRemoveAction(Dali::Constraint::Discard);
1217
1218     actor.ApplyConstraint(constraint);
1219   }
1220
1221   ItemLayout::BoolFunction visibilityConstraint;
1222   if (layout.GetVisibilityConstraint(itemId, visibilityConstraint))
1223   {
1224     WrappedBoolConstraint wrapped(visibilityConstraint, itemId);
1225
1226     Constraint constraint = Constraint::New<bool>( Actor::VISIBLE,
1227                                                    Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1228                                                    ParentSource( mPropertyScrollSpeed ),
1229                                                    ParentSource( Actor::SIZE ),
1230                                                    wrapped );
1231     constraint.SetApplyTime(duration);
1232     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1233
1234     // Release visibility constraints the same time as the color constraint
1235     constraint.SetRemoveTime(DEFAULT_COLOR_VISIBILITY_REMOVE_TIME);
1236     constraint.SetRemoveAction(Dali::Constraint::Discard);
1237
1238     actor.ApplyConstraint(constraint);
1239   }
1240 }
1241
1242 void ItemView::ReapplyAllConstraints( float durationSeconds )
1243 {
1244   for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
1245   {
1246     unsigned int id = iter->first;
1247     Actor actor = iter->second;
1248
1249     actor.RemoveConstraints();
1250     ApplyConstraints(actor, *mActiveLayout, id, durationSeconds);
1251   }
1252
1253   CalculateDomainSize(Self().GetCurrentSize());
1254 }
1255
1256 float ItemView::ClampFirstItemPosition(float targetPosition, const Vector3& targetSize, ItemLayout& layout)
1257 {
1258   Actor self = Self();
1259   float minLayoutPosition = layout.GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), targetSize);
1260   float clamppedPosition = min(0.0f, max(minLayoutPosition, targetPosition));
1261   mScrollOvershoot = targetPosition - clamppedPosition;
1262   self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1263
1264   return clamppedPosition;
1265 }
1266
1267 void ItemView::OnPan(PanGesture gesture)
1268 {
1269   Actor self = Self();
1270   const Vector3 layoutSize = Self().GetCurrentSize();
1271
1272   RemoveAnimation(mScrollAnimation);
1273
1274   // Short-circuit if there is no active layout
1275   if (!mActiveLayout)
1276   {
1277     mGestureState = Gesture::Clear;
1278     return;
1279   }
1280
1281   mGestureState = gesture.state;
1282
1283   switch (mGestureState)
1284   {
1285     case Gesture::Finished:
1286     {
1287       // Swipe Detection
1288       if (fabsf(mScrollDistance) > mMinimumSwipeDistance &&
1289           mScrollSpeed > mMinimumSwipeSpeed)
1290       {
1291         float direction = (mScrollDistance < 0.0f) ? -1.0f : 1.0f;
1292
1293         mRefreshOrderHint = true;
1294
1295         float currentLayoutPosition = GetCurrentLayoutPosition(0);
1296         float firstItemScrollPosition = ClampFirstItemPosition(currentLayoutPosition + mScrollSpeed * direction,
1297                                                                layoutSize,
1298                                                                *mActiveLayout);
1299
1300         if (mAnchoringEnabled)
1301         {
1302           firstItemScrollPosition = mActiveLayout->GetClosestAnchorPosition(firstItemScrollPosition);
1303         }
1304
1305         RemoveAnimation(mScrollAnimation);
1306
1307         float flickAnimationDuration = mActiveLayout->GetItemFlickAnimationDuration() * max(1.0f, fabsf(firstItemScrollPosition - GetCurrentLayoutPosition(0)));
1308         mScrollAnimation = Animation::New(flickAnimationDuration);
1309         mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1310         mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1311         mScrollAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), 0.0f, AlphaFunctions::EaseOut );
1312
1313         mIsFlicking = true;
1314         // Check whether it has already scrolled to the end
1315         if(fabs(currentLayoutPosition - firstItemScrollPosition) > Math::MACHINE_EPSILON_0)
1316         {
1317           AnimateScrollOvershoot(0.0f);
1318         }
1319       }
1320
1321       // Anchoring may be triggered when there was no swipe
1322       if (!mScrollAnimation)
1323       {
1324         mScrollAnimation = DoAnchoring();
1325       }
1326
1327       // Reset the overshoot if no scroll animation.
1328       if (!mScrollAnimation)
1329       {
1330         mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1331
1332         AnimateScrollOvershoot(0.0f, false);
1333       }
1334     }
1335     break;
1336
1337     case Gesture::Started: // Fall through
1338     {
1339       mTotalPanDisplacement = Vector2::ZERO;
1340     }
1341
1342     case Gesture::Continuing:
1343     {
1344       mScrollDistance = CalculateScrollDistance(gesture.displacement, *mActiveLayout);
1345       mScrollSpeed = Clamp((gesture.GetSpeed() * mActiveLayout->GetScrollSpeedFactor() * MILLISECONDS_PER_SECONDS), 0.0f, mActiveLayout->GetMaximumSwipeSpeed());
1346
1347       // Refresh order depends on the direction of the scroll; negative is towards the last item.
1348       mRefreshOrderHint = mScrollDistance < 0.0f;
1349
1350       float layoutPositionDelta = GetCurrentLayoutPosition(0) + (mScrollDistance * mActiveLayout->GetScrollSpeedFactor());
1351
1352       float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
1353
1354       mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1355       self.SetProperty(mPropertyPosition, GetScrollPosition(firstItemScrollPosition, layoutSize));
1356       mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1357
1358       mTotalPanDisplacement += gesture.displacement;
1359       mScrollOvershoot = layoutPositionDelta - firstItemScrollPosition;
1360       if( mScrollOvershoot > Math::MACHINE_EPSILON_1 )
1361       {
1362         AnimateScrollOvershoot(1.0f);
1363       }
1364       else if( mScrollOvershoot < -Math::MACHINE_EPSILON_1 )
1365       {
1366         AnimateScrollOvershoot(-1.0f);
1367       }
1368       else
1369       {
1370         AnimateScrollOvershoot(0.0f);
1371       }
1372     }
1373     break;
1374
1375     case Gesture::Cancelled:
1376     {
1377       mScrollAnimation = DoAnchoring();
1378     }
1379     break;
1380
1381     default:
1382       break;
1383   }
1384
1385   if (mScrollAnimation)
1386   {
1387     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1388     mScrollAnimation.Play();
1389   }
1390 }
1391
1392 bool ItemView::OnAccessibilityPan(PanGesture gesture)
1393 {
1394   OnPan(gesture);
1395   return true;
1396 }
1397
1398 Actor ItemView::GetNextKeyboardFocusableActor(Actor actor, Toolkit::Control::KeyboardFocusNavigationDirection direction, bool loopEnabled)
1399 {
1400   Actor nextFocusActor;
1401   if(mActiveLayout)
1402   {
1403     int nextItemID = 0;
1404     if(!actor || actor == this->Self())
1405     {
1406       nextFocusActor = GetItem(nextItemID);
1407     }
1408     else if(actor && actor.GetParent() == this->Self())
1409     {
1410       int itemID = GetItemId(actor);
1411       nextItemID = mActiveLayout->GetNextFocusItemID(itemID, mItemFactory.GetNumberOfItems(), direction, loopEnabled);
1412       nextFocusActor = GetItem(nextItemID);
1413       if(nextFocusActor == actor)
1414       {
1415         // need to pass NULL actor back to focus manager
1416         nextFocusActor.Reset();
1417         return nextFocusActor;
1418       }
1419     }
1420     float layoutPosition = mActiveLayout->GetClosestAnchorPosition( GetCurrentLayoutPosition(0) );
1421     Vector3 layoutSize = Self().GetCurrentSize();
1422     if(!nextFocusActor)
1423     {
1424       // likely the current item is not buffered, so not in our item pool, probably best to get first viewable item
1425       ItemRange viewableItems = mActiveLayout->GetItemsWithinArea(layoutPosition, layoutSize);
1426       nextItemID = viewableItems.begin;
1427       nextFocusActor = GetItem(nextItemID);
1428     }
1429   }
1430   return nextFocusActor;
1431 }
1432
1433 void ItemView::OnKeyboardFocusChangeCommitted(Actor commitedFocusableActor)
1434 {
1435   // only in this function if our chosen focus actor was actually used
1436   if(commitedFocusableActor)
1437   {
1438     int nextItemID = GetItemId(commitedFocusableActor);
1439     float layoutPosition = GetCurrentLayoutPosition(0);
1440     Vector3 layoutSize = Self().GetCurrentSize();
1441     Vector3 focusItemPosition = Vector3::ZERO;
1442     ItemLayout::Vector3Function itemPositionConstraint;
1443     if (mActiveLayout->GetPositionConstraint(nextItemID, itemPositionConstraint))
1444     {
1445       focusItemPosition = itemPositionConstraint(Vector3::ZERO, layoutPosition + nextItemID, 0.0f, layoutSize);
1446     }
1447
1448     float scrollTo = mActiveLayout->GetClosestOnScreenLayoutPosition(nextItemID, layoutPosition, layoutSize);
1449     ScrollTo(Vector3(0.0f, scrollTo, 0.0f), DEFAULT_KEYBOARD_FOCUS_SCROLL_DURATION);
1450   }
1451 }
1452
1453 Animation ItemView::DoAnchoring()
1454 {
1455   Animation anchoringAnimation;
1456   Actor self = Self();
1457
1458   if (mActiveLayout && mAnchoringEnabled)
1459   {
1460     float anchorPosition = mActiveLayout->GetClosestAnchorPosition( GetCurrentLayoutPosition(0) );
1461
1462     anchoringAnimation = Animation::New(mAnchoringDuration);
1463     anchoringAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), anchorPosition, AlphaFunctions::EaseOut );
1464     anchoringAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(anchorPosition, self.GetCurrentSize()), AlphaFunctions::EaseOut );
1465     anchoringAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), 0.0f, AlphaFunctions::EaseOut );
1466     if(!mIsFlicking)
1467     {
1468       AnimateScrollOvershoot(0.0f);
1469     }
1470   }
1471
1472   return anchoringAnimation;
1473 }
1474
1475 void ItemView::OnScrollFinished(Animation& source)
1476 {
1477   Actor self = Self();
1478
1479   RemoveAnimation(mScrollAnimation); // mScrollAnimation is used to query whether we're scrolling
1480
1481   mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1482
1483   if(mIsFlicking && fabsf(mScrollOvershoot) > Math::MACHINE_EPSILON_1)
1484   {
1485     AnimateScrollOvershoot( mScrollOvershoot > 0.0f ? 1.0f : -1.0f, true);
1486   }
1487   else
1488   {
1489     // Reset the overshoot
1490     AnimateScrollOvershoot( 0.0f );
1491   }
1492   mIsFlicking = false;
1493
1494   mScrollOvershoot = 0.0f;
1495 }
1496
1497 void ItemView::OnOvershootOnFinished(Animation& animation)
1498 {
1499   mAnimatingOvershootOn = false;
1500   mScrollOvershootAnimation.FinishedSignal().Disconnect(this, &ItemView::OnOvershootOnFinished);
1501   RemoveAnimation(mScrollOvershootAnimation);
1502   if(mAnimateOvershootOff)
1503   {
1504     AnimateScrollOvershoot(0.0f);
1505   }
1506 }
1507
1508 void ItemView::ScrollToItem(unsigned int itemId, float durationSeconds)
1509 {
1510   Actor self = Self();
1511   const Vector3 layoutSize = Self().GetCurrentSize();
1512   float firstItemScrollPosition = ClampFirstItemPosition(mActiveLayout->GetItemScrollToPosition(itemId), layoutSize, *mActiveLayout);
1513
1514   if(durationSeconds > 0.0f)
1515   {
1516     RemoveAnimation(mScrollAnimation);
1517     mScrollAnimation = Animation::New(durationSeconds);
1518     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1519     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1520     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1521     mScrollAnimation.Play();
1522   }
1523   else
1524   {
1525     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1526     AnimateScrollOvershoot(0.0f);
1527   }
1528
1529   mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1530 }
1531
1532 void ItemView::RemoveAnimation(Animation& animation)
1533 {
1534   if(animation)
1535   {
1536     // Cease animating, and reset handle.
1537     animation.Clear();
1538     animation.Reset();
1539   }
1540 }
1541
1542 void ItemView::CalculateDomainSize(const Vector3& layoutSize)
1543 {
1544   Actor self = Self();
1545
1546   Vector3 firstItemPosition(Vector3::ZERO);
1547   Vector3 lastItemPosition(Vector3::ZERO);
1548
1549   if(mActiveLayout)
1550   {
1551     ItemLayout::Vector3Function firstItemPositionConstraint;
1552     if (mActiveLayout->GetPositionConstraint(0, firstItemPositionConstraint))
1553     {
1554       firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, 0, 0.0f, layoutSize);
1555     }
1556
1557     float minLayoutPosition = mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), layoutSize);
1558     self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1559
1560     ItemLayout::Vector3Function lastItemPositionConstraint;
1561     if (mActiveLayout->GetPositionConstraint(fabs(minLayoutPosition), lastItemPositionConstraint))
1562     {
1563       lastItemPosition = lastItemPositionConstraint(Vector3::ZERO, fabs(minLayoutPosition), 0.0f, layoutSize);
1564     }
1565
1566     float domainSize;
1567
1568     if(IsHorizontal(mActiveLayout->GetOrientation()))
1569     {
1570       self.SetProperty(mPropertyPositionMin, Vector3(0.0f, firstItemPosition.x, 0.0f));
1571       self.SetProperty(mPropertyPositionMax, Vector3(0.0f, lastItemPosition.x, 0.0f));
1572       domainSize = fabs(firstItemPosition.x - lastItemPosition.x);
1573     }
1574     else
1575     {
1576       self.SetProperty(mPropertyPositionMin, Vector3(0.0f, firstItemPosition.y, 0.0f));
1577       self.SetProperty(mPropertyPositionMax, Vector3(0.0f, lastItemPosition.y, 0.0f));
1578       domainSize = fabs(firstItemPosition.y - lastItemPosition.y);
1579     }
1580
1581     mScrollConnector.SetScrollDomain(minLayoutPosition, 0.0f, domainSize);
1582
1583     bool isLayoutScrollable = IsLayoutScrollable(layoutSize);
1584     self.SetProperty(mPropertyCanScrollVertical, isLayoutScrollable);
1585     self.SetProperty(mPropertyCanScrollHorizontal, false);
1586   }
1587 }
1588
1589 Vector3 ItemView::GetDomainSize() const
1590 {
1591   Actor self = Self();
1592
1593   float minScrollPosition = self.GetProperty<float>(mPropertyPositionMin);
1594   float maxScrollPosition = self.GetProperty<float>(mPropertyPositionMax);
1595
1596   return Vector3(0.0f, fabs(maxScrollPosition - minScrollPosition), 0.0f);
1597 }
1598
1599 bool ItemView::IsLayoutScrollable(const Vector3& layoutSize)
1600 {
1601   Actor self = Self();
1602
1603   float currentLayoutPosition = ClampFirstItemPosition( GetCurrentLayoutPosition(0), layoutSize, *mActiveLayout );
1604   float forwardClampedPosition = ClampFirstItemPosition(currentLayoutPosition + 1.0, layoutSize, *mActiveLayout);
1605   float backwardClampedPosition = ClampFirstItemPosition(currentLayoutPosition - 1.0, layoutSize, *mActiveLayout);
1606
1607   return (fabs(forwardClampedPosition - backwardClampedPosition) > Math::MACHINE_EPSILON_0);
1608 }
1609
1610 float ItemView::GetScrollPosition(float layoutPosition, const Vector3& layoutSize) const
1611 {
1612   Vector3 firstItemPosition(Vector3::ZERO);
1613   ItemLayout::Vector3Function firstItemPositionConstraint;
1614   if (mActiveLayout->GetPositionConstraint(0, firstItemPositionConstraint))
1615   {
1616     firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, layoutPosition, 0.0f, layoutSize);
1617   }
1618
1619   return IsHorizontal(mActiveLayout->GetOrientation()) ? firstItemPosition.x: firstItemPosition.y;
1620 }
1621
1622 Vector3 ItemView::GetCurrentScrollPosition() const
1623 {
1624   float currentLayoutPosition = GetCurrentLayoutPosition(0);
1625   return Vector3(0.0f, GetScrollPosition(currentLayoutPosition, Self().GetCurrentSize()), 0.0f);
1626 }
1627
1628 void ItemView::AddOverlay(Actor actor)
1629 {
1630   Self().Add(actor);
1631 }
1632
1633 void ItemView::RemoveOverlay(Actor actor)
1634 {
1635   Self().Remove(actor);
1636 }
1637
1638 void ItemView::ScrollTo(const Vector3& position, float duration)
1639 {
1640   Actor self = Self();
1641   const Vector3 layoutSize = Self().GetCurrentSize();
1642
1643   float firstItemScrollPosition = ClampFirstItemPosition(position.y, layoutSize, *mActiveLayout);
1644
1645   if(duration > 0.0f)
1646   {
1647     RemoveAnimation(mScrollAnimation);
1648     mScrollAnimation = Animation::New(duration);
1649     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1650     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1651     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1652     mScrollAnimation.Play();
1653   }
1654   else
1655   {
1656     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1657     AnimateScrollOvershoot(0.0f);
1658   }
1659
1660   mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1661 }
1662
1663 void ItemView::SetOvershootEnabled( bool enable )
1664 {
1665   Actor self = Self();
1666   if( enable )
1667   {
1668     mOvershootEffect = BouncingEffect::New(Scrollable::DEFAULT_OVERSHOOT_COLOUR);
1669     mOvershootOverlay = CreateSolidColorActor(Vector4::ONE);
1670     mOvershootOverlay.SetParentOrigin(ParentOrigin::TOP_LEFT);
1671     mOvershootOverlay.SetAnchorPoint(AnchorPoint::TOP_LEFT);
1672     mOvershootOverlay.SetDrawMode(DrawMode::OVERLAY);
1673     mOvershootOverlay.SetShaderEffect(mOvershootEffect);
1674     self.Add(mOvershootOverlay);
1675     Constraint constraint = Constraint::New<float>( Actor::SIZE_WIDTH,
1676                                                       ParentSource( mPropertyScrollDirection ),
1677                                                       Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1678                                                       ParentSource( Actor::SIZE ),
1679                                                       OvershootOverlaySizeConstraint() );
1680     mOvershootOverlay.ApplyConstraint(constraint);
1681     mOvershootOverlay.SetSize(OVERSHOOT_BOUNCE_IMAGE_1_PIXEL_AREA.width, OVERSHOOT_BOUNCE_IMAGE_1_PIXEL_AREA.height);
1682
1683     constraint = Constraint::New<Quaternion>( Actor::ROTATION,
1684                                               ParentSource( mPropertyScrollDirection ),
1685                                               Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1686                                               OvershootOverlayRotationConstraint() );
1687     mOvershootOverlay.ApplyConstraint(constraint);
1688
1689     constraint = Constraint::New<Vector3>( Actor::POSITION,
1690                                            ParentSource( Actor::SIZE ),
1691                                            ParentSource( mPropertyScrollDirection ),
1692                                            Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1693                                            OvershootOverlayPositionConstraint() );
1694     mOvershootOverlay.ApplyConstraint(constraint);
1695
1696     constraint = Constraint::New<bool>( Actor::VISIBLE,
1697                                         ParentSource( mPropertyCanScrollVertical ),
1698                                         OvershootOverlayVisibilityConstraint() );
1699     mOvershootOverlay.ApplyConstraint(constraint);
1700
1701     int effectOvershootPropertyIndex = mOvershootEffect.GetPropertyIndex(mOvershootEffect.GetProgressRatePropertyName());
1702     Actor self = Self();
1703     constraint = Constraint::New<float>( effectOvershootPropertyIndex,
1704                                          Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1705                                          EqualToConstraint() );
1706     mOvershootEffect.ApplyConstraint(constraint);
1707   }
1708   else
1709   {
1710     if( mOvershootOverlay )
1711     {
1712       self.Remove(mOvershootOverlay);
1713       mOvershootOverlay.Reset();
1714     }
1715     mOvershootEffect.Reset();
1716   }
1717 }
1718
1719 float ItemView::CalculateScrollOvershoot()
1720 {
1721   float overshoot = 0.0f;
1722
1723   if(mActiveLayout)
1724   {
1725     // The overshoot must be calculated from the accumulated pan gesture displacement
1726     // since the pan gesture starts.
1727     Actor self = Self();
1728     float scrollDistance = CalculateScrollDistance(mTotalPanDisplacement, *mActiveLayout) * mActiveLayout->GetScrollSpeedFactor();
1729     float positionDelta = GetCurrentLayoutPosition(0) + scrollDistance;
1730     float minLayoutPosition = mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), Self().GetCurrentSize());
1731     self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1732     float clamppedPosition = min(0.0f, max(minLayoutPosition, positionDelta));
1733     overshoot = positionDelta - clamppedPosition;
1734   }
1735
1736   return overshoot;
1737 }
1738
1739 void ItemView::AnimateScrollOvershoot(float overshootAmount, bool animateBack)
1740 {
1741   bool animatingOn = fabsf(overshootAmount) > Math::MACHINE_EPSILON_1;
1742
1743   // make sure we animate back if needed
1744   mAnimateOvershootOff = animateBack || (!animatingOn && mAnimatingOvershootOn);
1745
1746   if( mAnimatingOvershootOn )
1747   {
1748     // animating on, do not allow animate off
1749     return;
1750   }
1751
1752   Actor self = Self();
1753   float currentOvershoot = mScrollPositionObject.GetProperty<float>(ScrollConnector::OVERSHOOT);
1754   float duration = DEFAULT_OVERSHOOT_ANIMATION_DURATION * (animatingOn ? (1.0f - fabsf(currentOvershoot)) : fabsf(currentOvershoot));
1755
1756   RemoveAnimation(mScrollOvershootAnimation);
1757   mScrollOvershootAnimation = Animation::New(duration);
1758   mScrollOvershootAnimation.FinishedSignal().Connect(this, &ItemView::OnOvershootOnFinished);
1759   mScrollOvershootAnimation.AnimateTo( Property(mScrollPositionObject, ScrollConnector::OVERSHOOT), overshootAmount, TimePeriod(0.0f, duration) );
1760   mScrollOvershootAnimation.Play();
1761
1762   mAnimatingOvershootOn = animatingOn;
1763 }
1764
1765 void ItemView::SetItemsParentOrigin( const Vector3& parentOrigin )
1766 {
1767   if( parentOrigin != mItemsParentOrigin )
1768   {
1769     mItemsParentOrigin = parentOrigin;
1770     for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
1771     {
1772       iter->second.SetParentOrigin(parentOrigin);
1773     }
1774   }
1775 }
1776
1777 Vector3 ItemView::GetItemsParentOrigin() const
1778 {
1779   return mItemsParentOrigin;
1780 }
1781
1782 void ItemView::SetItemsAnchorPoint( const Vector3& anchorPoint )
1783 {
1784   if( anchorPoint != mItemsAnchorPoint )
1785   {
1786     mItemsAnchorPoint = anchorPoint;
1787     for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
1788     {
1789       iter->second.SetAnchorPoint(anchorPoint);
1790     }
1791   }
1792 }
1793
1794 Vector3 ItemView::GetItemsAnchorPoint() const
1795 {
1796   return mItemsAnchorPoint;
1797 }
1798
1799 void ItemView::GetItemsRange(ItemRange& range)
1800 {
1801   range.begin = mItemPool.begin()->first;
1802   range.end = mItemPool.rbegin()->first + 1;
1803 }
1804
1805 } // namespace Internal
1806
1807 } // namespace Toolkit
1808
1809 } // namespace Dali