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 Flora License, Version 1.0 (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://floralicense.org/license/
   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 // CLASS HEADER
  18 #include <dali-toolkit/internal/controls/scrollable/item-view/item-view-impl.h>
  19
  20 // EXTERNAL INCLUDES
  21 #include <algorithm>
  22
  23 // INTERNAL INCLUDES
  24 #include <dali/public-api/events/mouse-wheel-event.h>
  25 #include <dali-toolkit/public-api/controls/scrollable/item-view/item-factory.h>
  26 #include <dali-toolkit/internal/controls/scrollable/scroll-connector-impl.h>
  27 #include <dali-toolkit/public-api/controls/default-controls/solid-color-actor.h>
  28
  29 using namespace std;
  30 using namespace Dali;
  31
  32 namespace // unnamed namespace
  33 {
  34
  35 //Type registration
  36 TypeRegistration mType( typeid(Toolkit::ItemView), typeid(Toolkit::Scrollable), NULL );
  37
  38 const float DEFAULT_MINIMUM_SWIPE_SPEED = 1.0f;
  39 const float DEFAULT_MINIMUM_SWIPE_DISTANCE = 3.0f;
  40 const float DEFAULT_MOUSE_WHEEL_SCROLL_DISTANCE_STEP_PROPORTION = 0.1f;
  41
  42 const float DEFAULT_REFRESH_INTERVAL_LAYOUT_POSITIONS = 20.0f; // 1 updates per 20 items
  43 const int MOUSE_WHEEL_EVENT_FINISHED_TIME_OUT = 500;  // 0.5 second
  44
  45 const float DEFAULT_ANCHORING_DURATION = 1.0f;  // 1 second
  46 const float DEFAULT_COLOR_VISIBILITY_REMOVE_TIME = 0.5f; // 0.5 second
  47
  48 const float MILLISECONDS_PER_SECONDS = 1000.0f;
  49
  50 const Rect<int> OVERSHOOT_BOUNCE_IMAGE_1_PIXEL_AREA( 0, 0, 720, 58 );
  51 const Vector4 OVERSHOOT_OVERLAY_NINE_PATCH_BORDER(0.0f, 0.0f, 1.0f, 12.0f);
  52 const float MAXIMUM_OVERSHOOT_HEIGHT = 36.0f;  // 36 pixels
  53 const float DEFAULT_OVERSHOOT_ANIMATION_DURATION = 0.5f;  // 0.5 second
  54 const float DEFAULT_KEYBOARD_FOCUS_SCROLL_DURATION = 0.2f;
  55
  56 const string LAYOUT_POSITION_PROPERTY_NAME( "item-view-layout-position" );
  57 const string POSITION_PROPERTY_NAME( "item-view-position" );
  58 const string MINIMUM_LAYOUT_POSITION_PROPERTY_NAME( "item-view-minimum-layout-position" );
  59 const string SCROLL_SPEED_PROPERTY_NAME( "item-view-scroll-speed" );
  60 const string SCROLL_DIRECTION_PROPERTY_NAME( "item-view-scroll-direction" );
  61 const string OVERSHOOT_PROPERTY_NAME( "item-view-overshoot" );
  62
  63 // Functors which wrap constraint functions with stored item IDs
  64
  65 struct WrappedVector3Constraint
  66 {
  67   WrappedVector3Constraint(Toolkit::ItemLayout::Vector3Function wrapMe, unsigned int itemId)
  68   : mWrapMe(wrapMe),
  69     mItemId(itemId)
  70   {
  71   }
  72
  73   Vector3 operator()(const Vector3& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
  74   {
  75     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
  76
  77     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
  78   }
  79
  80   Toolkit::ItemLayout::Vector3Function mWrapMe;
  81   unsigned int mItemId;
  82 };
  83
  84 struct WrappedQuaternionConstraint
  85 {
  86   WrappedQuaternionConstraint(Toolkit::ItemLayout::QuaternionFunction wrapMe, unsigned int itemId)
  87   : mWrapMe(wrapMe),
  88     mItemId(itemId)
  89   {
  90   }
  91
  92   Quaternion operator()(const Quaternion& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
  93   {
  94     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
  95
  96     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
  97   }
  98
  99   Toolkit::ItemLayout::QuaternionFunction mWrapMe;
 100   unsigned int mItemId;
 101 };
 102
 103 struct WrappedVector4Constraint
 104 {
 105   WrappedVector4Constraint(Toolkit::ItemLayout::Vector4Function wrapMe, unsigned int itemId)
 106   : mWrapMe(wrapMe),
 107     mItemId(itemId)
 108   {
 109   }
 110
 111   Vector4 operator()(const Vector4& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
 112   {
 113     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
 114
 115     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
 116   }
 117
 118   Toolkit::ItemLayout::Vector4Function mWrapMe;
 119   unsigned int mItemId;
 120 };
 121
 122 struct WrappedBoolConstraint
 123 {
 124   WrappedBoolConstraint(Toolkit::ItemLayout::BoolFunction wrapMe, unsigned int itemId)
 125   : mWrapMe(wrapMe),
 126     mItemId(itemId)
 127   {
 128   }
 129
 130   bool operator()(const bool& current, const PropertyInput& layoutPosition, const PropertyInput& scrollSpeed, const PropertyInput& layoutSize)
 131   {
 132     float offsetLayoutPosition = layoutPosition.GetFloat() + static_cast<float>(mItemId);
 133
 134     return mWrapMe(current, offsetLayoutPosition, scrollSpeed.GetFloat(), layoutSize.GetVector3());
 135   }
 136
 137   Toolkit::ItemLayout::BoolFunction mWrapMe;
 138   unsigned int mItemId;
 139 };
 140
 141 /**
 142  * Local helper to convert pan distance (in actor coordinates) to the layout-specific scrolling direction
 143  */
 144 float CalculateScrollDistance(Vector2 panDistance, Toolkit::ItemLayout& layout)
 145 {
 146   Radian scrollDirection(layout.GetScrollDirection());
 147
 148   float cosTheta = cosf(scrollDirection);
 149   float sinTheta = sinf(scrollDirection);
 150
 151   return panDistance.x * sinTheta + panDistance.y * cosTheta;
 152 }
 153
 154 // Overshoot overlay constraints
 155
 156 struct OvershootOverlaySizeConstraint
 157 {
 158   float operator()(const float& current,
 159                      const PropertyInput& parentScrollDirectionProperty,
 160                      const PropertyInput& parentOvershootProperty,
 161                      const PropertyInput& parentSizeProperty)
 162   {
 163     const Vector3 parentScrollDirection = parentScrollDirectionProperty.GetVector3();
 164     const Vector3 parentSize = parentSizeProperty.GetVector3();
 165     const Toolkit::ControlOrientation::Type& parentOrientation = static_cast<Toolkit::ControlOrientation::Type>(parentScrollDirection.z);
 166
 167     float overlayWidth;
 168
 169     if(Toolkit::IsVertical(parentOrientation))
 170     {
 171       overlayWidth = fabsf(parentScrollDirection.y) > Math::MACHINE_EPSILON_1 ? parentSize.x : parentSize.y;
 172     }
 173     else
 174     {
 175       overlayWidth = fabsf(parentScrollDirection.x) > Math::MACHINE_EPSILON_1 ? parentSize.y : parentSize.x;
 176     }
 177
 178     return overlayWidth;
 179   }
 180 };
 181
 182 struct OvershootOverlayRotationConstraint
 183 {
 184   Quaternion operator()(const Quaternion& current,
 185                         const PropertyInput& parentScrollDirectionProperty,
 186                         const PropertyInput& parentOvershootProperty)
 187   {
 188     const Vector3 parentScrollDirection = parentScrollDirectionProperty.GetVector3();
 189     const float parentOvershoot = parentOvershootProperty.GetFloat();
 190     const Toolkit::ControlOrientation::Type& parentOrientation = static_cast<Toolkit::ControlOrientation::Type>(parentScrollDirection.z);
 191
 192     Quaternion rotation;
 193
 194     if(Toolkit::IsVertical(parentOrientation))
 195     {
 196       if(fabsf(parentScrollDirection.y) <= Math::MACHINE_EPSILON_1)
 197       {
 198         if( (parentOrientation == Toolkit::ControlOrientation::Up && parentOvershoot < Math::MACHINE_EPSILON_0)
 199             || (parentOrientation == Toolkit::ControlOrientation::Down && parentOvershoot > Math::MACHINE_EPSILON_0) )
 200         {
 201           rotation = Quaternion(0.5f * Math::PI, Vector3::ZAXIS);
 202         }
 203         else
 204         {
 205           rotation = Quaternion(1.5f * Math::PI, Vector3::ZAXIS);
 206         }
 207       }
 208       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.y > Math::MACHINE_EPSILON_0)
 209             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.y < Math::MACHINE_EPSILON_0) )
 210       {
 211         rotation = Quaternion(0.0f, Vector3::ZAXIS);
 212       }
 213       else
 214       {
 215         rotation = Quaternion(Math::PI, Vector3::ZAXIS);
 216       }
 217     }
 218     else
 219     {
 220       if(fabsf(parentScrollDirection.x) <= Math::MACHINE_EPSILON_1)
 221       {
 222         if( (parentOrientation == Toolkit::ControlOrientation::Left && parentOvershoot > Math::MACHINE_EPSILON_0)
 223             ||(parentOrientation == Toolkit::ControlOrientation::Right && parentOvershoot < Math::MACHINE_EPSILON_0) )
 224         {
 225           rotation = Quaternion(Math::PI, Vector3::ZAXIS);
 226         }
 227         else
 228         {
 229           rotation = Quaternion(0.0f, Vector3::ZAXIS);
 230         }
 231       }
 232       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.x > Math::MACHINE_EPSILON_0)
 233             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.x < Math::MACHINE_EPSILON_0) )
 234       {
 235         rotation = Quaternion(1.5f * Math::PI, Vector3::ZAXIS);
 236       }
 237       else
 238       {
 239         rotation = Quaternion(0.5f * Math::PI, Vector3::ZAXIS);
 240       }
 241     }
 242
 243     return rotation;
 244   }
 245 };
 246
 247 struct OvershootOverlayPositionConstraint
 248 {
 249   Vector3 operator()(const Vector3&    current,
 250                      const PropertyInput& parentSizeProperty,
 251                      const PropertyInput& parentScrollDirectionProperty,
 252                      const PropertyInput& parentOvershootProperty)
 253   {
 254     const Vector3 parentScrollDirection = parentScrollDirectionProperty.GetVector3();
 255     const float parentOvershoot = parentOvershootProperty.GetFloat();
 256     const Vector3 parentSize = parentSizeProperty.GetVector3();
 257     const Toolkit::ControlOrientation::Type& parentOrientation = static_cast<Toolkit::ControlOrientation::Type>(parentScrollDirection.z);
 258
 259     Vector3 relativeOffset;
 260
 261     if(Toolkit::IsVertical(parentOrientation))
 262     {
 263       if(fabsf(parentScrollDirection.y) <= Math::MACHINE_EPSILON_1)
 264       {
 265         if( (parentOrientation == Toolkit::ControlOrientation::Up && parentOvershoot < Math::MACHINE_EPSILON_0)
 266             || (parentOrientation == Toolkit::ControlOrientation::Down && parentOvershoot > Math::MACHINE_EPSILON_0) )
 267         {
 268           relativeOffset = Vector3(1.0f, 0.0f, 0.0f);
 269         }
 270         else
 271         {
 272           relativeOffset =Vector3(0.0f, 1.0f, 0.0f);
 273         }
 274       }
 275       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.y > Math::MACHINE_EPSILON_0)
 276             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.y < Math::MACHINE_EPSILON_0) )
 277       {
 278         relativeOffset = Vector3(0.0f, 0.0f, 0.0f);
 279       }
 280       else
 281       {
 282         relativeOffset = Vector3(1.0f, 1.0f, 0.0f);
 283       }
 284     }
 285     else
 286     {
 287       if(fabsf(parentScrollDirection.x) <= Math::MACHINE_EPSILON_1)
 288       {
 289         if( (parentOrientation == Toolkit::ControlOrientation::Left && parentOvershoot < Math::MACHINE_EPSILON_0)
 290             || (parentOrientation == Toolkit::ControlOrientation::Right && parentOvershoot > Math::MACHINE_EPSILON_0) )
 291         {
 292           relativeOffset = Vector3(0.0f, 0.0f, 0.0f);
 293         }
 294         else
 295         {
 296           relativeOffset = Vector3(1.0f, 1.0f, 0.0f);
 297         }
 298       }
 299       else if( (parentOvershoot > Math::MACHINE_EPSILON_0 && parentScrollDirection.x > Math::MACHINE_EPSILON_0)
 300             || (parentOvershoot < Math::MACHINE_EPSILON_0 && parentScrollDirection.x < Math::MACHINE_EPSILON_0) )
 301       {
 302         relativeOffset = Vector3(0.0f, 1.0f, 0.0f);
 303       }
 304       else
 305       {
 306         relativeOffset = Vector3(1.0f, 0.0f, 0.0f);
 307       }
 308     }
 309
 310     return relativeOffset * parentSize;
 311
 312   }
 313 };
 314
 315 struct OvershootOverlayVisibilityConstraint
 316 {
 317   bool operator()(const bool& current,
 318                   const PropertyInput& parentLayoutScrollableProperty)
 319   {
 320     const bool parentLayoutScrollable = parentLayoutScrollableProperty.GetBoolean();
 321
 322     return parentLayoutScrollable;
 323   }
 324 };
 325
 326 /**
 327  * Relative position Constraint
 328  * Generates the relative position value of the item view based on the layout position,
 329  * and it's relation to the layout domain. This is a value from 0.0f to 1.0f in each axis.
 330  */
 331 Vector3 RelativePositionConstraint(const Vector3& current,
 332                                    const PropertyInput& scrollPositionProperty,
 333                                    const PropertyInput& scrollMinProperty,
 334                                    const PropertyInput& scrollMaxProperty,
 335                                    const PropertyInput& layoutSizeProperty)
 336 {
 337   const Vector3& position = Vector3(0.0f, scrollPositionProperty.GetFloat(), 0.0f);
 338   const Vector3& min = scrollMinProperty.GetVector3();
 339   const Vector3& max = scrollMaxProperty.GetVector3();
 340
 341   Vector3 relativePosition;
 342   Vector3 domainSize = max - min;
 343
 344   relativePosition.x = fabsf(domainSize.x) > Math::MACHINE_EPSILON_1 ? ((min.x - position.x) / fabsf(domainSize.x)) : 0.0f;
 345   relativePosition.y = fabsf(domainSize.y) > Math::MACHINE_EPSILON_1 ? ((min.y - position.y) / fabsf(domainSize.y)) : 0.0f;
 346
 347   return relativePosition;
 348 }
 349
 350 } // unnamed namespace
 351
 352 namespace Dali
 353 {
 354
 355 namespace Toolkit
 356 {
 357
 358 namespace Internal
 359 {
 360
 361 namespace // unnamed namespace
 362 {
 363
 364 bool FindById( const ItemContainer& items, ItemId id )
 365 {
 366   for( ConstItemIter iter = items.begin(); items.end() != iter; ++iter )
 367   {
 368     if( iter->first == id )
 369     {
 370       return true;
 371     }
 372   }
 373
 374   return false;
 375 }
 376
 377 } // unnamed namespace
 378
 379 Dali::Toolkit::ItemView ItemView::New(ItemFactory& factory)
 380 {
 381   // Create the implementation
 382   ItemViewPtr itemView(new ItemView(factory));
 383
 384   // Pass ownership to CustomActor via derived handle
 385   Dali::Toolkit::ItemView handle(*itemView);
 386
 387   // Second-phase init of the implementation
 388   // This can only be done after the CustomActor connection has been made...
 389   itemView->Initialize();
 390
 391   return handle;
 392 }
 393
 394 ItemView::ItemView(ItemFactory& factory)
 395 : Scrollable(),
 396   mItemFactory(factory),
 397   mActiveLayout(NULL),
 398   mDefaultAlphaFunction(Dali::Constraint::DEFAULT_ALPHA_FUNCTION),
 399   mAnimatingOvershootOn(false),
 400   mAnimateOvershootOff(false),
 401   mAnchoringEnabled(true),
 402   mAnchoringDuration(DEFAULT_ANCHORING_DURATION),
 403   mRefreshIntervalLayoutPositions(DEFAULT_REFRESH_INTERVAL_LAYOUT_POSITIONS),
 404   mRefreshOrderHint(true/*Refresh item 0 first*/),
 405   mMinimumSwipeSpeed(DEFAULT_MINIMUM_SWIPE_SPEED),
 406   mMinimumSwipeDistance(DEFAULT_MINIMUM_SWIPE_DISTANCE),
 407   mScrollDistance(0.0f),
 408   mScrollSpeed(0.0f),
 409   mTotalPanDisplacement(Vector2::ZERO),
 410   mScrollOvershoot(0.0f),
 411   mIsFlicking(false),
 412   mGestureState(Gesture::Clear),
 413   mAddingItems(false),
 414   mRefreshEnabled(true),
 415   mItemsParentOrigin( ParentOrigin::CENTER),
 416   mItemsAnchorPoint( AnchorPoint::CENTER)
 417 {
 418   SetRequiresMouseWheelEvents(true);
 419   SetKeyboardNavigationSupport(true);
 420 }
 421
 422 void ItemView::OnInitialize()
 423 {
 424   SetSizePolicy( Toolkit::Control::Fixed, Toolkit::Control::Fixed );
 425
 426   RegisterCommonProperties();
 427
 428   Actor self = Self();
 429
 430   mScrollConnector = Dali::Toolkit::ScrollConnector::New();
 431   mScrollPositionObject = mScrollConnector.GetScrollPositionObject();
 432
 433   mPropertyMinimumLayoutPosition = self.RegisterProperty(MINIMUM_LAYOUT_POSITION_PROPERTY_NAME, 0.0f);
 434   mPropertyPosition = self.RegisterProperty(POSITION_PROPERTY_NAME, 0.0f);
 435   mPropertyScrollSpeed = self.RegisterProperty(SCROLL_SPEED_PROPERTY_NAME, 0.0f);
 436
 437   EnableScrollComponent(Toolkit::Scrollable::OvershootIndicator);
 438
 439   Constraint constraint = Constraint::New<Vector3>(mPropertyRelativePosition,
 440                                                    LocalSource(mPropertyPosition),
 441                                                    LocalSource(mPropertyPositionMin),
 442                                                    LocalSource(mPropertyPositionMax),
 443                                                    LocalSource(Actor::SIZE),
 444                                                    RelativePositionConstraint);
 445   self.ApplyConstraint(constraint);
 446
 447   Vector2 stageSize = Stage::GetCurrent().GetSize();
 448   mMouseWheelScrollDistanceStep = stageSize.y * DEFAULT_MOUSE_WHEEL_SCROLL_DISTANCE_STEP_PROPORTION;
 449
 450   EnableGestureDetection(Gesture::Type(Gesture::Pan));
 451
 452   mMouseWheelEventFinishedTimer = Timer::New( MOUSE_WHEEL_EVENT_FINISHED_TIME_OUT );
 453   mMouseWheelEventFinishedTimer.TickSignal().Connect( this, &ItemView::OnMouseWheelEventFinished );
 454
 455   SetRefreshInterval(mRefreshIntervalLayoutPositions);
 456 }
 457
 458 ItemView::~ItemView()
 459 {
 460 }
 461
 462 Dali::Toolkit::ScrollConnector ItemView::GetScrollConnector() const
 463 {
 464   return mScrollConnector;
 465 }
 466
 467 unsigned int ItemView::GetLayoutCount() const
 468 {
 469   return mLayouts.size();
 470 }
 471
 472 void ItemView::AddLayout(ItemLayout& layout)
 473 {
 474   mLayouts.push_back(ItemLayoutPtr(&layout));
 475 }
 476
 477 void ItemView::RemoveLayout(unsigned int layoutIndex)
 478 {
 479   DALI_ASSERT_ALWAYS(layoutIndex < mLayouts.size());
 480
 481   if (mActiveLayout == mLayouts[layoutIndex].Get())
 482   {
 483     mActiveLayout = NULL;
 484   }
 485
 486   mLayouts.erase(mLayouts.begin() + layoutIndex);
 487 }
 488
 489 ItemLayoutPtr ItemView::GetLayout(unsigned int layoutIndex) const
 490 {
 491   return mLayouts[layoutIndex];
 492 }
 493
 494 ItemLayoutPtr ItemView::GetActiveLayout() const
 495 {
 496   return ItemLayoutPtr(mActiveLayout);
 497 }
 498
 499 float ItemView::GetCurrentLayoutPosition(unsigned int itemId) const
 500 {
 501   return mScrollPositionObject.GetProperty<float>( ScrollConnector::SCROLL_POSITION ) + static_cast<float>( itemId );
 502 }
 503
 504 void ItemView::ActivateLayout(unsigned int layoutIndex, const Vector3& targetSize, float durationSeconds)
 505 {
 506   DALI_ASSERT_ALWAYS(layoutIndex < mLayouts.size());
 507
 508   Actor self = Self();
 509
 510   // The ItemView size should match the active layout size
 511   self.SetSize(targetSize);
 512   mActiveLayoutTargetSize = targetSize;
 513
 514   // Switch to the new layout
 515   mActiveLayout = mLayouts[layoutIndex].Get();
 516
 517   // Move the items to the new layout positions...
 518
 519   bool resizeAnimationNeeded(false);
 520
 521   for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 522   {
 523     unsigned int itemId = iter->first;
 524     Actor actor = iter->second;
 525
 526     // Remove constraints from previous layout
 527     actor.RemoveConstraints();
 528
 529     Vector3 size;
 530     if(mActiveLayout->GetItemSize(itemId, targetSize, size))
 531     {
 532       if( durationSeconds > 0.0f )
 533       {
 534         // Use a size animation
 535         if (!resizeAnimationNeeded)
 536         {
 537           resizeAnimationNeeded = true;
 538           RemoveAnimation(mResizeAnimation);
 539           mResizeAnimation = Animation::New(durationSeconds);
 540         }
 541
 542         // The layout provides its own resize animation
 543         mActiveLayout->GetResizeAnimation(mResizeAnimation, actor, size, durationSeconds);
 544       }
 545       else
 546       {
 547         // resize immediately
 548         actor.SetSize(size);
 549       }
 550     }
 551
 552     ApplyConstraints(actor, *mActiveLayout, itemId, durationSeconds);
 553   }
 554
 555   if (resizeAnimationNeeded)
 556   {
 557     mResizeAnimation.Play();
 558   }
 559
 560   // Refresh the new layout
 561   ItemRange range = GetItemRange(*mActiveLayout, targetSize, GetCurrentLayoutPosition(0), true/*reserve extra*/);
 562   AddActorsWithinRange( range, durationSeconds );
 563
 564   // Scroll to an appropriate layout position
 565
 566   bool scrollAnimationNeeded(false);
 567   float firstItemScrollPosition(0.0f);
 568
 569   float current = GetCurrentLayoutPosition(0);
 570   float minimum = ClampFirstItemPosition(current, targetSize, *mActiveLayout);
 571   self.SetProperty(mPropertyPosition, GetScrollPosition(current, targetSize));
 572
 573   if (current < minimum)
 574   {
 575     scrollAnimationNeeded = true;
 576     firstItemScrollPosition = minimum;
 577   }
 578   else if (mAnchoringEnabled)
 579   {
 580     scrollAnimationNeeded = true;
 581     firstItemScrollPosition = mActiveLayout->GetClosestAnchorPosition(current);
 582   }
 583
 584   if (scrollAnimationNeeded)
 585   {
 586     RemoveAnimation(mScrollAnimation);
 587     mScrollAnimation = Animation::New(mAnchoringDuration);
 588     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
 589     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, targetSize), AlphaFunctions::EaseOut );
 590     mScrollAnimation.Play();
 591   }
 592
 593   self.SetProperty(mPropertyMinimumLayoutPosition, mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), targetSize));
 594   AnimateScrollOvershoot(0.0f);
 595   mScrollOvershoot = 0.0f;
 596
 597   Radian scrollDirection(mActiveLayout->GetScrollDirection());
 598   float orientation = static_cast<float>(mActiveLayout->GetOrientation());
 599   self.SetProperty(mPropertyScrollDirection, Vector3(sinf(scrollDirection), cosf(scrollDirection), orientation));
 600
 601   self.SetProperty(mPropertyScrollSpeed, mScrollSpeed);
 602
 603   CalculateDomainSize(targetSize);
 604 }
 605
 606 void ItemView::DeactivateCurrentLayout()
 607 {
 608   if (mActiveLayout)
 609   {
 610     for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 611     {
 612       Actor actor = iter->second;
 613       actor.RemoveConstraints();
 614     }
 615
 616     mActiveLayout = NULL;
 617   }
 618 }
 619
 620 void ItemView::SetDefaultAlphaFunction(AlphaFunction func)
 621 {
 622   mDefaultAlphaFunction = func;
 623 }
 624
 625 AlphaFunction ItemView::GetDefaultAlphaFunction() const
 626 {
 627   return mDefaultAlphaFunction;
 628 }
 629
 630 void ItemView::OnRefreshNotification(PropertyNotification& source)
 631 {
 632   if(mRefreshEnabled)
 633   {
 634     // Only refresh the cache during normal scrolling
 635     DoRefresh(GetCurrentLayoutPosition(0), true);
 636   }
 637 }
 638
 639 void ItemView::DoRefresh(float currentLayoutPosition, bool cacheExtra)
 640 {
 641   if (mActiveLayout)
 642   {
 643     ItemRange range = GetItemRange(*mActiveLayout, mActiveLayoutTargetSize, currentLayoutPosition, cacheExtra/*reserve extra*/);
 644     RemoveActorsOutsideRange( range );
 645     AddActorsWithinRange( range, 0.0f/*immediate*/ );
 646
 647     mScrollUpdatedSignalV2.Emit( Vector3(0.0f, currentLayoutPosition, 0.0f) );
 648   }
 649 }
 650
 651 void ItemView::SetMinimumSwipeSpeed(float speed)
 652 {
 653   mMinimumSwipeSpeed = speed;
 654 }
 655
 656 float ItemView::GetMinimumSwipeSpeed() const
 657 {
 658   return mMinimumSwipeSpeed;
 659 }
 660
 661 void ItemView::SetMinimumSwipeDistance(float distance)
 662 {
 663   mMinimumSwipeDistance = distance;
 664 }
 665
 666 float ItemView::GetMinimumSwipeDistance() const
 667 {
 668   return mMinimumSwipeDistance;
 669 }
 670
 671 void ItemView::SetMouseWheelScrollDistanceStep(float step)
 672 {
 673   mMouseWheelScrollDistanceStep = step;
 674 }
 675
 676 float ItemView::GetMouseWheelScrollDistanceStep() const
 677 {
 678   return mMouseWheelScrollDistanceStep;
 679 }
 680
 681 void ItemView::SetAnchoring(bool enabled)
 682 {
 683   mAnchoringEnabled = enabled;
 684 }
 685
 686 bool ItemView::GetAnchoring() const
 687 {
 688   return mAnchoringEnabled;
 689 }
 690
 691 void ItemView::SetAnchoringDuration(float durationSeconds)
 692 {
 693   mAnchoringDuration = durationSeconds;
 694 }
 695
 696 float ItemView::GetAnchoringDuration() const
 697 {
 698   return mAnchoringDuration;
 699 }
 700
 701 void ItemView::SetRefreshInterval(float intervalLayoutPositions)
 702 {
 703   mRefreshIntervalLayoutPositions = intervalLayoutPositions;
 704
 705   if(mRefreshNotification)
 706   {
 707     mScrollPositionObject.RemovePropertyNotification(mRefreshNotification);
 708   }
 709   mRefreshNotification = mScrollPositionObject.AddPropertyNotification( ScrollConnector::SCROLL_POSITION, StepCondition(mRefreshIntervalLayoutPositions, 0.0f) );
 710   mRefreshNotification.NotifySignal().Connect( this, &ItemView::OnRefreshNotification );
 711 }
 712
 713 float ItemView::GetRefreshInterval() const
 714 {
 715   return mRefreshIntervalLayoutPositions;
 716 }
 717
 718 void ItemView::SetRefreshEnabled(bool enabled)
 719 {
 720   mRefreshEnabled = enabled;
 721 }
 722
 723 Actor ItemView::GetItem(unsigned int itemId) const
 724 {
 725   Actor actor;
 726
 727   ConstItemPoolIter iter = mItemPool.find( itemId );
 728   if( iter != mItemPool.end() )
 729   {
 730     actor = iter->second;
 731   }
 732
 733   return actor;
 734 }
 735
 736 unsigned int ItemView::GetItemId( Actor actor ) const
 737 {
 738   unsigned int itemId( 0 );
 739
 740   for ( ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter )
 741   {
 742     if( iter->second == actor )
 743     {
 744       itemId = iter->first;
 745       break;
 746     }
 747   }
 748
 749   return itemId;
 750 }
 751
 752 void ItemView::InsertItem( Item newItem, float durationSeconds )
 753 {
 754   mAddingItems = true;
 755
 756   SetupActor( newItem, durationSeconds );
 757   Self().Add( newItem.second );
 758
 759   ItemPoolIter foundIter = mItemPool.find( newItem.first );
 760   if( mItemPool.end() != foundIter )
 761   {
 762     Actor moveMe = foundIter->second;
 763     foundIter->second = newItem.second;
 764
 765     // Move the existing actors to make room
 766     for( ItemPoolIter iter = ++foundIter; mItemPool.end() != iter; ++iter )
 767     {
 768       Actor temp = iter->second;
 769       iter->second = moveMe;
 770       moveMe = temp;
 771
 772       iter->second.RemoveConstraints();
 773       ApplyConstraints( iter->second, *mActiveLayout, iter->first, durationSeconds );
 774     }
 775
 776     // Create last item
 777     ItemId lastId = mItemPool.rbegin()->first;
 778     Item lastItem( lastId + 1, moveMe );
 779     mItemPool.insert( lastItem );
 780
 781     lastItem.second.RemoveConstraints();
 782     ApplyConstraints( lastItem.second, *mActiveLayout, lastItem.first, durationSeconds );
 783   }
 784   else
 785   {
 786     mItemPool.insert( newItem );
 787   }
 788
 789   CalculateDomainSize(Self().GetCurrentSize());
 790
 791   mAddingItems = false;
 792 }
 793
 794 void ItemView::InsertItems( const ItemContainer& newItems, float durationSeconds )
 795 {
 796   mAddingItems = true;
 797
 798   // Insert from lowest id to highest
 799   set<Item> sortedItems;
 800   for( ConstItemIter iter = newItems.begin(); newItems.end() != iter; ++iter )
 801   {
 802     sortedItems.insert( *iter );
 803   }
 804
 805   for( set<Item>::iterator iter = sortedItems.begin(); sortedItems.end() != iter; ++iter )
 806   {
 807     Self().Add( iter->second );
 808
 809     cout << "inserting item: " << iter->first << endl;
 810
 811     ItemPoolIter foundIter = mItemPool.find( iter->first );
 812     if( mItemPool.end() != foundIter )
 813     {
 814       Actor moveMe = foundIter->second;
 815       foundIter->second = iter->second;
 816
 817       // Move the existing actors to make room
 818       for( ItemPoolIter iter = ++foundIter; mItemPool.end() != iter; ++iter )
 819       {
 820         Actor temp = iter->second;
 821         iter->second = moveMe;
 822         moveMe = temp;
 823       }
 824
 825       // Create last item
 826       ItemId lastId = mItemPool.rbegin()->first;
 827       Item lastItem( lastId + 1, moveMe );
 828       mItemPool.insert( lastItem );
 829     }
 830     else
 831     {
 832       mItemPool.insert( *iter );
 833     }
 834   }
 835
 836   // Relayout everything
 837   for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 838   {
 839     // If newly inserted
 840     if( FindById( newItems, iter->first ) )
 841     {
 842       SetupActor( *iter, durationSeconds );
 843     }
 844     else
 845     {
 846       iter->second.RemoveConstraints();
 847       ApplyConstraints( iter->second, *mActiveLayout, iter->first, durationSeconds );
 848     }
 849   }
 850
 851   CalculateDomainSize(Self().GetCurrentSize());
 852
 853   mAddingItems = false;
 854 }
 855
 856 void ItemView::RemoveItem( unsigned int itemId, float durationSeconds )
 857 {
 858   bool actorRemoved = RemoveActor( itemId );
 859   if( actorRemoved )
 860   {
 861     ReapplyAllConstraints( durationSeconds );
 862   }
 863 }
 864
 865 void ItemView::RemoveItems( const ItemIdContainer& itemIds, float durationSeconds )
 866 {
 867   bool actorRemoved( false );
 868
 869   // Remove from highest id to lowest
 870   set<ItemId> sortedItems;
 871   for( ConstItemIdIter iter = itemIds.begin(); itemIds.end() != iter; ++iter )
 872   {
 873     sortedItems.insert( *iter );
 874   }
 875
 876   for( set<ItemId>::reverse_iterator iter = sortedItems.rbegin(); sortedItems.rend() != iter; ++iter )
 877   {
 878     if( RemoveActor( *iter ) )
 879     {
 880       actorRemoved = true;
 881     }
 882   }
 883
 884   if( actorRemoved )
 885   {
 886     ReapplyAllConstraints( durationSeconds );
 887   }
 888 }
 889
 890 bool ItemView::RemoveActor(unsigned int itemId)
 891 {
 892   bool removed( false );
 893
 894   const ItemPoolIter removeIter = mItemPool.find( itemId );
 895
 896   if( removeIter != mItemPool.end() )
 897   {
 898     Self().Remove( removeIter->second );
 899     removed = true;
 900
 901     // Adjust the remaining item IDs, for example if item 2 is removed:
 902     //   Initial actors:     After insert:
 903     //     ID 1 - ActorA       ID 1 - ActorA
 904     //     ID 2 - ActorB       ID 2 - ActorC (previously ID 3)
 905     //     ID 3 - ActorC       ID 3 - ActorB (previously ID 4)
 906     //     ID 4 - ActorD
 907     for (ItemPoolIter iter = removeIter; iter != mItemPool.end(); ++iter)
 908     {
 909       if( iter->first < mItemPool.rbegin()->first )
 910       {
 911         iter->second = mItemPool[ iter->first + 1 ];
 912       }
 913       else
 914       {
 915         mItemPool.erase( iter );
 916         break;
 917       }
 918     }
 919   }
 920
 921   return removed;
 922 }
 923
 924 void ItemView::ReplaceItem( Item replacementItem, float durationSeconds )
 925 {
 926   mAddingItems = true;
 927
 928   SetupActor( replacementItem, durationSeconds );
 929   Self().Add( replacementItem.second );
 930
 931   const ItemPoolIter iter = mItemPool.find( replacementItem.first );
 932   if( mItemPool.end() != iter )
 933   {
 934     Self().Remove( iter->second );
 935     iter->second = replacementItem.second;
 936   }
 937   else
 938   {
 939     mItemPool.insert( replacementItem );
 940   }
 941
 942   CalculateDomainSize(Self().GetCurrentSize());
 943
 944   mAddingItems = false;
 945 }
 946
 947 void ItemView::ReplaceItems( const ItemContainer& replacementItems, float durationSeconds )
 948 {
 949   for( ConstItemIter iter = replacementItems.begin(); replacementItems.end() != iter; ++iter )
 950   {
 951     ReplaceItem( *iter, durationSeconds );
 952   }
 953 }
 954
 955 void ItemView::RemoveActorsOutsideRange( ItemRange range )
 956 {
 957   // Remove unwanted actors from the ItemView & ItemPool
 958   for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); )
 959   {
 960     unsigned int current = iter->first;
 961
 962     if( ! range.Within( current ) )
 963     {
 964       Self().Remove( iter->second );
 965
 966       mItemPool.erase( iter++ ); // erase invalidates the return value of post-increment; iter remains valid
 967     }
 968     else
 969     {
 970       ++iter;
 971     }
 972   }
 973 }
 974
 975 void ItemView::AddActorsWithinRange( ItemRange range, float durationSeconds )
 976 {
 977   range.end = min(mItemFactory.GetNumberOfItems(), range.end);
 978
 979   // The order of addition depends on the scroll direction.
 980   if (mRefreshOrderHint)
 981   {
 982     for (unsigned int itemId = range.begin; itemId < range.end; ++itemId)
 983     {
 984       AddNewActor( itemId, durationSeconds );
 985     }
 986   }
 987   else
 988   {
 989     for (unsigned int itemId = range.end; itemId > range.begin; --itemId)
 990     {
 991       AddNewActor( itemId-1, durationSeconds );
 992     }
 993   }
 994
 995   // Total number of items may change dynamically.
 996   // Always recalculate the domain size to reflect that.
 997   CalculateDomainSize(Self().GetCurrentSize());
 998 }
 999
1000 void ItemView::AddNewActor( unsigned int itemId, float durationSeconds )
1001 {
1002   mAddingItems = true;
1003
1004   if( mItemPool.end() == mItemPool.find( itemId ) )
1005   {
1006     Actor actor = mItemFactory.NewItem( itemId );
1007
1008     if( actor )
1009     {
1010       Item newItem( itemId, actor );
1011
1012       mItemPool.insert( newItem );
1013
1014       SetupActor( newItem, durationSeconds );
1015       Self().Add( actor );
1016     }
1017   }
1018
1019   mAddingItems = false;
1020 }
1021
1022 void ItemView::SetupActor( Item item, float durationSeconds )
1023 {
1024   item.second.SetParentOrigin( mItemsParentOrigin );
1025   item.second.SetAnchorPoint( mItemsAnchorPoint );
1026
1027   if( mActiveLayout )
1028   {
1029     Vector3 size;
1030     if( mActiveLayout->GetItemSize( item.first, mActiveLayoutTargetSize, size ) )
1031     {
1032       item.second.SetSize( size );
1033     }
1034
1035     ApplyConstraints( item.second, *mActiveLayout, item.first, durationSeconds );
1036   }
1037 }
1038
1039 ItemRange ItemView::GetItemRange(ItemLayout& layout, const Vector3& layoutSize, float layoutPosition, bool reserveExtra)
1040 {
1041   unsigned int itemCount = mItemFactory.GetNumberOfItems();
1042
1043   ItemRange available(0u, itemCount);
1044
1045   ItemRange range = layout.GetItemsWithinArea( layoutPosition, layoutSize );
1046
1047   if (reserveExtra)
1048   {
1049     // Add the reserve items for scrolling
1050     unsigned int extra = layout.GetReserveItemCount(layoutSize);
1051     range.begin = (range.begin >= extra) ? (range.begin - extra) : 0u;
1052     range.end += extra;
1053   }
1054
1055   return range.Intersection(available);
1056 }
1057
1058 void ItemView::OnChildAdd(Actor& child)
1059 {
1060   if(!mAddingItems)
1061   {
1062     // We don't want to do this downcast check for any item added by ItemView itself.
1063     Dali::Toolkit::ScrollComponent scrollComponent = Dali::Toolkit::ScrollComponent::DownCast(child);
1064     if(scrollComponent)
1065     {
1066       // Set the scroll connector when scroll bar is being added
1067       scrollComponent.SetScrollConnector(mScrollConnector);
1068     }
1069   }
1070 }
1071
1072 bool ItemView::OnTouchEvent(const TouchEvent& event)
1073 {
1074   // Ignore events with multiple-touch points
1075   if (event.GetPointCount() != 1)
1076   {
1077     return false;
1078   }
1079
1080   if (event.GetPoint(0).state == TouchPoint::Down)
1081   {
1082     // Cancel ongoing scrolling etc.
1083     mGestureState = Gesture::Clear;
1084
1085     mScrollDistance = 0.0f;
1086     mScrollSpeed = 0.0f;
1087     Self().SetProperty(mPropertyScrollSpeed, mScrollSpeed);
1088
1089     mScrollOvershoot = 0.0f;
1090     AnimateScrollOvershoot(0.0f);
1091
1092     mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1093
1094     RemoveAnimation(mScrollAnimation);
1095   }
1096
1097   return true; // consume since we're potentially scrolling
1098 }
1099
1100 bool ItemView::OnMouseWheelEvent(const MouseWheelEvent& event)
1101 {
1102   // Respond the mouse wheel event to scroll
1103   if (mActiveLayout)
1104   {
1105     Actor self = Self();
1106     const Vector3 layoutSize = Self().GetCurrentSize();
1107     float layoutPositionDelta = GetCurrentLayoutPosition(0) + (event.z * mMouseWheelScrollDistanceStep * mActiveLayout->GetScrollSpeedFactor());
1108     float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
1109
1110     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1111     self.SetProperty(mPropertyPosition, GetScrollPosition(firstItemScrollPosition, layoutSize));
1112     mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1113   }
1114
1115   if (mMouseWheelEventFinishedTimer.IsRunning())
1116   {
1117     mMouseWheelEventFinishedTimer.Stop();
1118   }
1119
1120   mMouseWheelEventFinishedTimer.Start();
1121
1122   return true;
1123 }
1124
1125 bool ItemView::OnMouseWheelEventFinished()
1126 {
1127   if (mActiveLayout)
1128   {
1129     RemoveAnimation(mScrollAnimation);
1130
1131     // No more mouse wheel events coming. Do the anchoring if enabled.
1132     mScrollAnimation = DoAnchoring();
1133     if (mScrollAnimation)
1134     {
1135       mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1136       mScrollAnimation.Play();
1137     }
1138     else
1139     {
1140       mScrollOvershoot = 0.0f;
1141       AnimateScrollOvershoot(0.0f);
1142
1143       mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1144     }
1145   }
1146
1147   return false;
1148 }
1149
1150 void ItemView::ApplyConstraints(Actor& actor, ItemLayout& layout, unsigned int itemId, float duration)
1151 {
1152   ItemLayout::Vector3Function positionConstraint;
1153   if (layout.GetPositionConstraint(itemId, positionConstraint))
1154   {
1155     WrappedVector3Constraint wrapped(positionConstraint, itemId);
1156
1157     Constraint constraint = Constraint::New<Vector3>( Actor::POSITION,
1158                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1159                                                       ParentSource( mPropertyScrollSpeed ),
1160                                                       ParentSource( Actor::SIZE ),
1161                                                       wrapped );
1162     constraint.SetApplyTime(duration);
1163     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1164
1165     actor.ApplyConstraint(constraint);
1166   }
1167
1168   ItemLayout::QuaternionFunction rotationConstraint;
1169   if (layout.GetRotationConstraint(itemId, rotationConstraint))
1170   {
1171     WrappedQuaternionConstraint wrapped(rotationConstraint, itemId);
1172
1173     Constraint constraint = Constraint::New<Quaternion>( Actor::ROTATION,
1174                                                          Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1175                                                          ParentSource( mPropertyScrollSpeed ),
1176                                                          ParentSource( Actor::SIZE ),
1177                                                          wrapped );
1178     constraint.SetApplyTime(duration);
1179     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1180
1181     actor.ApplyConstraint(constraint);
1182   }
1183
1184   ItemLayout::Vector3Function scaleConstraint;
1185   if (layout.GetScaleConstraint(itemId, scaleConstraint))
1186   {
1187     WrappedVector3Constraint wrapped(scaleConstraint, itemId);
1188
1189     Constraint constraint = Constraint::New<Vector3>( Actor::SCALE,
1190                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1191                                                       ParentSource( mPropertyScrollSpeed ),
1192                                                       ParentSource( Actor::SIZE ),
1193                                                       wrapped );
1194     constraint.SetApplyTime(duration);
1195     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1196
1197     actor.ApplyConstraint(constraint);
1198   }
1199
1200   ItemLayout::Vector4Function colorConstraint;
1201   if (layout.GetColorConstraint(itemId, colorConstraint))
1202   {
1203     WrappedVector4Constraint wrapped(colorConstraint, itemId);
1204
1205     Constraint constraint = Constraint::New<Vector4>( Actor::COLOR,
1206                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1207                                                       ParentSource( mPropertyScrollSpeed ),
1208                                                       ParentSource( Actor::SIZE ),
1209                                                       wrapped );
1210     constraint.SetApplyTime(duration);
1211     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1212
1213     // Release color constraints slowly; this allows ItemView to co-exist with ImageActor fade-in
1214     constraint.SetRemoveTime(DEFAULT_COLOR_VISIBILITY_REMOVE_TIME);
1215     constraint.SetRemoveAction(Dali::Constraint::Discard);
1216
1217     actor.ApplyConstraint(constraint);
1218   }
1219
1220   ItemLayout::BoolFunction visibilityConstraint;
1221   if (layout.GetVisibilityConstraint(itemId, visibilityConstraint))
1222   {
1223     WrappedBoolConstraint wrapped(visibilityConstraint, itemId);
1224
1225     Constraint constraint = Constraint::New<bool>( Actor::VISIBLE,
1226                                                    Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1227                                                    ParentSource( mPropertyScrollSpeed ),
1228                                                    ParentSource( Actor::SIZE ),
1229                                                    wrapped );
1230     constraint.SetApplyTime(duration);
1231     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1232
1233     // Release visibility constraints the same time as the color constraint
1234     constraint.SetRemoveTime(DEFAULT_COLOR_VISIBILITY_REMOVE_TIME);
1235     constraint.SetRemoveAction(Dali::Constraint::Discard);
1236
1237     actor.ApplyConstraint(constraint);
1238   }
1239 }
1240
1241 void ItemView::ReapplyAllConstraints( float durationSeconds )
1242 {
1243   for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
1244   {
1245     unsigned int id = iter->first;
1246     Actor actor = iter->second;
1247
1248     actor.RemoveConstraints();
1249     ApplyConstraints(actor, *mActiveLayout, id, durationSeconds);
1250   }
1251
1252   CalculateDomainSize(Self().GetCurrentSize());
1253 }
1254
1255 float ItemView::ClampFirstItemPosition(float targetPosition, const Vector3& targetSize, ItemLayout& layout)
1256 {
1257   Actor self = Self();
1258   float minLayoutPosition = layout.GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), targetSize);
1259   float clamppedPosition = min(0.0f, max(minLayoutPosition, targetPosition));
1260   mScrollOvershoot = targetPosition - clamppedPosition;
1261   self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1262
1263   return clamppedPosition;
1264 }
1265
1266 void ItemView::OnPan(PanGesture gesture)
1267 {
1268   Actor self = Self();
1269   const Vector3 layoutSize = Self().GetCurrentSize();
1270
1271   RemoveAnimation(mScrollAnimation);
1272
1273   // Short-circuit if there is no active layout
1274   if (!mActiveLayout)
1275   {
1276     mGestureState = Gesture::Clear;
1277     return;
1278   }
1279
1280   mGestureState = gesture.state;
1281
1282   switch (mGestureState)
1283   {
1284     case Gesture::Finished:
1285     {
1286       // Swipe Detection
1287       if (fabsf(mScrollDistance) > mMinimumSwipeDistance &&
1288           mScrollSpeed > mMinimumSwipeSpeed)
1289       {
1290         float direction = (mScrollDistance < 0.0f) ? -1.0f : 1.0f;
1291
1292         mRefreshOrderHint = true;
1293
1294         float currentLayoutPosition = GetCurrentLayoutPosition(0);
1295         float firstItemScrollPosition = ClampFirstItemPosition(currentLayoutPosition + mScrollSpeed * direction,
1296                                                                layoutSize,
1297                                                                *mActiveLayout);
1298
1299         if (mAnchoringEnabled)
1300         {
1301           firstItemScrollPosition = mActiveLayout->GetClosestAnchorPosition(firstItemScrollPosition);
1302         }
1303
1304         RemoveAnimation(mScrollAnimation);
1305
1306         float flickAnimationDuration = mActiveLayout->GetItemFlickAnimationDuration() * max(1.0f, fabsf(firstItemScrollPosition - GetCurrentLayoutPosition(0)));
1307         mScrollAnimation = Animation::New(flickAnimationDuration);
1308         mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1309         mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1310         mScrollAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), 0.0f, AlphaFunctions::EaseOut );
1311
1312         mIsFlicking = true;
1313         // Check whether it has already scrolled to the end
1314         if(fabs(currentLayoutPosition - firstItemScrollPosition) > Math::MACHINE_EPSILON_0)
1315         {
1316           AnimateScrollOvershoot(0.0f);
1317         }
1318       }
1319
1320       // Anchoring may be triggered when there was no swipe
1321       if (!mScrollAnimation)
1322       {
1323         mScrollAnimation = DoAnchoring();
1324       }
1325
1326       // Reset the overshoot if no scroll animation.
1327       if (!mScrollAnimation)
1328       {
1329         mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1330
1331         AnimateScrollOvershoot(0.0f, false);
1332       }
1333     }
1334     break;
1335
1336     case Gesture::Started: // Fall through
1337     {
1338       mTotalPanDisplacement = Vector2::ZERO;
1339     }
1340
1341     case Gesture::Continuing:
1342     {
1343       mScrollDistance = CalculateScrollDistance(gesture.displacement, *mActiveLayout);
1344       mScrollSpeed = Clamp((gesture.GetSpeed() * mActiveLayout->GetScrollSpeedFactor() * MILLISECONDS_PER_SECONDS), 0.0f, mActiveLayout->GetMaximumSwipeSpeed());
1345
1346       // Refresh order depends on the direction of the scroll; negative is towards the last item.
1347       mRefreshOrderHint = mScrollDistance < 0.0f;
1348
1349       RemoveAnimation(mScrollSpeedAnimation);
1350       mScrollSpeedAnimation = Animation::New(0.3f);
1351       mScrollSpeedAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), mScrollSpeed, AlphaFunctions::Linear );
1352       mScrollSpeedAnimation.Play();
1353
1354       float layoutPositionDelta = GetCurrentLayoutPosition(0) + (mScrollDistance * mActiveLayout->GetScrollSpeedFactor());
1355
1356       float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
1357
1358       mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1359       self.SetProperty(mPropertyPosition, GetScrollPosition(firstItemScrollPosition, layoutSize));
1360       mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1361
1362       mTotalPanDisplacement += gesture.displacement;
1363       mScrollOvershoot = layoutPositionDelta - firstItemScrollPosition;
1364       if( mScrollOvershoot > Math::MACHINE_EPSILON_1 )
1365       {
1366         AnimateScrollOvershoot(1.0f);
1367       }
1368       else if( mScrollOvershoot < -Math::MACHINE_EPSILON_1 )
1369       {
1370         AnimateScrollOvershoot(-1.0f);
1371       }
1372       else
1373       {
1374         AnimateScrollOvershoot(0.0f);
1375       }
1376     }
1377     break;
1378
1379     case Gesture::Cancelled:
1380     {
1381       mScrollAnimation = DoAnchoring();
1382     }
1383     break;
1384
1385     default:
1386       break;
1387   }
1388
1389   if (mScrollAnimation)
1390   {
1391     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1392     mScrollAnimation.Play();
1393   }
1394 }
1395
1396 bool ItemView::OnAccessibilityPan(PanGesture gesture)
1397 {
1398   OnPan(gesture);
1399   return true;
1400 }
1401
1402 Actor ItemView::GetNextKeyboardFocusableActor(Actor actor, Toolkit::Control::KeyboardFocusNavigationDirection direction, bool loopEnabled)
1403 {
1404   Actor nextFocusActor;
1405   if(mActiveLayout)
1406   {
1407     int nextItemID = 0;
1408     if(!actor || actor == this->Self())
1409     {
1410       nextFocusActor = GetItem(nextItemID);
1411     }
1412     else if(actor && actor.GetParent() == this->Self())
1413     {
1414       int itemID = GetItemId(actor);
1415       nextItemID = mActiveLayout->GetNextFocusItemID(itemID, mItemFactory.GetNumberOfItems(), direction, loopEnabled);
1416       nextFocusActor = GetItem(nextItemID);
1417       if(nextFocusActor == actor)
1418       {
1419         // need to pass NULL actor back to focus manager
1420         nextFocusActor.Reset();
1421         return nextFocusActor;
1422       }
1423     }
1424     float layoutPosition = mActiveLayout->GetClosestAnchorPosition( GetCurrentLayoutPosition(0) );
1425     Vector3 layoutSize = Self().GetCurrentSize();
1426     if(!nextFocusActor)
1427     {
1428       // likely the current item is not buffered, so not in our item pool, probably best to get first viewable item
1429       ItemRange viewableItems = mActiveLayout->GetItemsWithinArea(layoutPosition, layoutSize);
1430       nextItemID = viewableItems.begin;
1431       nextFocusActor = GetItem(nextItemID);
1432     }
1433   }
1434   return nextFocusActor;
1435 }
1436
1437 void ItemView::OnKeyboardFocusChangeCommitted(Actor commitedFocusableActor)
1438 {
1439   // only in this function if our chosen focus actor was actually used
1440   if(commitedFocusableActor)
1441   {
1442     int nextItemID = GetItemId(commitedFocusableActor);
1443     float layoutPosition = GetCurrentLayoutPosition(0);
1444     Vector3 layoutSize = Self().GetCurrentSize();
1445     Vector3 focusItemPosition = Vector3::ZERO;
1446     ItemLayout::Vector3Function itemPositionConstraint;
1447     if (mActiveLayout->GetPositionConstraint(nextItemID, itemPositionConstraint))
1448     {
1449       focusItemPosition = itemPositionConstraint(Vector3::ZERO, layoutPosition + nextItemID, 0.0f, layoutSize);
1450     }
1451
1452     float scrollTo = mActiveLayout->GetClosestOnScreenLayoutPosition(nextItemID, layoutPosition, layoutSize);
1453     ScrollTo(Vector3(0.0f, scrollTo, 0.0f), DEFAULT_KEYBOARD_FOCUS_SCROLL_DURATION);
1454   }
1455 }
1456
1457 Animation ItemView::DoAnchoring()
1458 {
1459   Animation anchoringAnimation;
1460   Actor self = Self();
1461
1462   if (mActiveLayout && mAnchoringEnabled)
1463   {
1464     float anchorPosition = mActiveLayout->GetClosestAnchorPosition( GetCurrentLayoutPosition(0) );
1465
1466     anchoringAnimation = Animation::New(mAnchoringDuration);
1467     anchoringAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), anchorPosition, AlphaFunctions::EaseOut );
1468     anchoringAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(anchorPosition, self.GetCurrentSize()), AlphaFunctions::EaseOut );
1469     anchoringAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), 0.0f, AlphaFunctions::EaseOut );
1470     if(!mIsFlicking)
1471     {
1472       AnimateScrollOvershoot(0.0f);
1473     }
1474   }
1475
1476   return anchoringAnimation;
1477 }
1478
1479 void ItemView::OnScrollFinished(Animation& source)
1480 {
1481   Actor self = Self();
1482
1483   RemoveAnimation(mScrollAnimation); // mScrollAnimation is used to query whether we're scrolling
1484
1485   mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1486
1487   if(mIsFlicking && fabsf(mScrollOvershoot) > Math::MACHINE_EPSILON_1)
1488   {
1489     AnimateScrollOvershoot( mScrollOvershoot > 0.0f ? 1.0f : -1.0f, true);
1490   }
1491   else
1492   {
1493     // Reset the overshoot
1494     AnimateScrollOvershoot( 0.0f );
1495   }
1496   mIsFlicking = false;
1497
1498   mScrollOvershoot = 0.0f;
1499 }
1500
1501 void ItemView::OnOvershootOnFinished(Animation& animation)
1502 {
1503   mAnimatingOvershootOn = false;
1504   mScrollOvershootAnimation.FinishedSignal().Disconnect(this, &ItemView::OnOvershootOnFinished);
1505   RemoveAnimation(mScrollOvershootAnimation);
1506   if(mAnimateOvershootOff)
1507   {
1508     AnimateScrollOvershoot(0.0f);
1509   }
1510 }
1511
1512 void ItemView::ScrollToItem(unsigned int itemId, float durationSeconds)
1513 {
1514   Actor self = Self();
1515   const Vector3 layoutSize = Self().GetCurrentSize();
1516   float firstItemScrollPosition = ClampFirstItemPosition(mActiveLayout->GetItemScrollToPosition(itemId), layoutSize, *mActiveLayout);
1517
1518   if(durationSeconds > 0.0f)
1519   {
1520     RemoveAnimation(mScrollAnimation);
1521     mScrollAnimation = Animation::New(durationSeconds);
1522     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1523     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1524     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1525     mScrollAnimation.Play();
1526   }
1527   else
1528   {
1529     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1530     AnimateScrollOvershoot(0.0f);
1531   }
1532
1533   mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1534 }
1535
1536 void ItemView::RemoveAnimation(Animation& animation)
1537 {
1538   if(animation)
1539   {
1540     // Cease animating, and reset handle.
1541     animation.Clear();
1542     animation.Reset();
1543   }
1544 }
1545
1546 void ItemView::CalculateDomainSize(const Vector3& layoutSize)
1547 {
1548   Actor self = Self();
1549
1550   Vector3 firstItemPosition(Vector3::ZERO);
1551   Vector3 lastItemPosition(Vector3::ZERO);
1552
1553   if(mActiveLayout)
1554   {
1555     ItemLayout::Vector3Function firstItemPositionConstraint;
1556     if (mActiveLayout->GetPositionConstraint(0, firstItemPositionConstraint))
1557     {
1558       firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, 0, 0.0f, layoutSize);
1559     }
1560
1561     float minLayoutPosition = mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), layoutSize);
1562     self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1563
1564     ItemLayout::Vector3Function lastItemPositionConstraint;
1565     if (mActiveLayout->GetPositionConstraint(fabs(minLayoutPosition), lastItemPositionConstraint))
1566     {
1567       lastItemPosition = lastItemPositionConstraint(Vector3::ZERO, fabs(minLayoutPosition), 0.0f, layoutSize);
1568     }
1569
1570     float domainSize;
1571
1572     if(IsHorizontal(mActiveLayout->GetOrientation()))
1573     {
1574       self.SetProperty(mPropertyPositionMin, Vector3(0.0f, firstItemPosition.x, 0.0f));
1575       self.SetProperty(mPropertyPositionMax, Vector3(0.0f, lastItemPosition.x, 0.0f));
1576       domainSize = fabs(firstItemPosition.x - lastItemPosition.x);
1577     }
1578     else
1579     {
1580       self.SetProperty(mPropertyPositionMin, Vector3(0.0f, firstItemPosition.y, 0.0f));
1581       self.SetProperty(mPropertyPositionMax, Vector3(0.0f, lastItemPosition.y, 0.0f));
1582       domainSize = fabs(firstItemPosition.y - lastItemPosition.y);
1583     }
1584
1585     mScrollConnector.SetScrollDomain(minLayoutPosition, 0.0f, domainSize);
1586
1587     bool isLayoutScrollable = IsLayoutScrollable(layoutSize);
1588     self.SetProperty(mPropertyCanScrollVertical, isLayoutScrollable);
1589     self.SetProperty(mPropertyCanScrollHorizontal, false);
1590   }
1591 }
1592
1593 Vector3 ItemView::GetDomainSize() const
1594 {
1595   Actor self = Self();
1596
1597   float minScrollPosition = self.GetProperty<float>(mPropertyPositionMin);
1598   float maxScrollPosition = self.GetProperty<float>(mPropertyPositionMax);
1599
1600   return Vector3(0.0f, fabs(maxScrollPosition - minScrollPosition), 0.0f);
1601 }
1602
1603 bool ItemView::IsLayoutScrollable(const Vector3& layoutSize)
1604 {
1605   Actor self = Self();
1606
1607   float currentLayoutPosition = ClampFirstItemPosition( GetCurrentLayoutPosition(0), layoutSize, *mActiveLayout );
1608   float forwardClampedPosition = ClampFirstItemPosition(currentLayoutPosition + 1.0, layoutSize, *mActiveLayout);
1609   float backwardClampedPosition = ClampFirstItemPosition(currentLayoutPosition - 1.0, layoutSize, *mActiveLayout);
1610
1611   return (fabs(forwardClampedPosition - backwardClampedPosition) > Math::MACHINE_EPSILON_0);
1612 }
1613
1614 float ItemView::GetScrollPosition(float layoutPosition, const Vector3& layoutSize) const
1615 {
1616   Vector3 firstItemPosition(Vector3::ZERO);
1617   ItemLayout::Vector3Function firstItemPositionConstraint;
1618   if (mActiveLayout->GetPositionConstraint(0, firstItemPositionConstraint))
1619   {
1620     firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, layoutPosition, 0.0f, layoutSize);
1621   }
1622
1623   return IsHorizontal(mActiveLayout->GetOrientation()) ? firstItemPosition.x: firstItemPosition.y;
1624 }
1625
1626 Vector3 ItemView::GetCurrentScrollPosition() const
1627 {
1628   float currentLayoutPosition = GetCurrentLayoutPosition(0);
1629   return Vector3(0.0f, GetScrollPosition(currentLayoutPosition, Self().GetCurrentSize()), 0.0f);
1630 }
1631
1632 void ItemView::AddOverlay(Actor actor)
1633 {
1634   Self().Add(actor);
1635 }
1636
1637 void ItemView::RemoveOverlay(Actor actor)
1638 {
1639   Self().Remove(actor);
1640 }
1641
1642 void ItemView::ScrollTo(const Vector3& position, float duration)
1643 {
1644   Actor self = Self();
1645   const Vector3 layoutSize = Self().GetCurrentSize();
1646
1647   float firstItemScrollPosition = ClampFirstItemPosition(position.y, layoutSize, *mActiveLayout);
1648
1649   if(duration > 0.0f)
1650   {
1651     RemoveAnimation(mScrollAnimation);
1652     mScrollAnimation = Animation::New(duration);
1653     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1654     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1655     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1656     mScrollAnimation.Play();
1657   }
1658   else
1659   {
1660     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1661     AnimateScrollOvershoot(0.0f);
1662   }
1663
1664   mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1665 }
1666
1667 void ItemView::SetOvershootEnabled( bool enable )
1668 {
1669   Actor self = Self();
1670   if( enable )
1671   {
1672     mOvershootEffect = BouncingEffect::New(Scrollable::DEFAULT_OVERSHOOT_COLOUR);
1673     mOvershootOverlay = CreateSolidColorActor(Vector4::ONE);
1674     mOvershootOverlay.SetParentOrigin(ParentOrigin::TOP_LEFT);
1675     mOvershootOverlay.SetAnchorPoint(AnchorPoint::TOP_LEFT);
1676     mOvershootOverlay.SetDrawMode(DrawMode::OVERLAY);
1677     mOvershootOverlay.SetShaderEffect(mOvershootEffect);
1678     self.Add(mOvershootOverlay);
1679     Constraint constraint = Constraint::New<float>( Actor::SIZE_WIDTH,
1680                                                       ParentSource( mPropertyScrollDirection ),
1681                                                       Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1682                                                       ParentSource( Actor::SIZE ),
1683                                                       OvershootOverlaySizeConstraint() );
1684     mOvershootOverlay.ApplyConstraint(constraint);
1685     mOvershootOverlay.SetSize(OVERSHOOT_BOUNCE_IMAGE_1_PIXEL_AREA.width, OVERSHOOT_BOUNCE_IMAGE_1_PIXEL_AREA.height);
1686
1687     constraint = Constraint::New<Quaternion>( Actor::ROTATION,
1688                                               ParentSource( mPropertyScrollDirection ),
1689                                               Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1690                                               OvershootOverlayRotationConstraint() );
1691     mOvershootOverlay.ApplyConstraint(constraint);
1692
1693     constraint = Constraint::New<Vector3>( Actor::POSITION,
1694                                            ParentSource( Actor::SIZE ),
1695                                            ParentSource( mPropertyScrollDirection ),
1696                                            Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1697                                            OvershootOverlayPositionConstraint() );
1698     mOvershootOverlay.ApplyConstraint(constraint);
1699
1700     constraint = Constraint::New<bool>( Actor::VISIBLE,
1701                                         ParentSource( mPropertyCanScrollVertical ),
1702                                         OvershootOverlayVisibilityConstraint() );
1703     mOvershootOverlay.ApplyConstraint(constraint);
1704
1705     int effectOvershootPropertyIndex = mOvershootEffect.GetPropertyIndex(mOvershootEffect.GetProgressRatePropertyName());
1706     Actor self = Self();
1707     constraint = Constraint::New<float>( effectOvershootPropertyIndex,
1708                                          Source( mScrollPositionObject, ScrollConnector::OVERSHOOT ),
1709                                          EqualToConstraint() );
1710     mOvershootEffect.ApplyConstraint(constraint);
1711   }
1712   else
1713   {
1714     if( mOvershootOverlay )
1715     {
1716       self.Remove(mOvershootOverlay);
1717       mOvershootOverlay.Reset();
1718     }
1719     mOvershootEffect.Reset();
1720   }
1721 }
1722
1723 float ItemView::CalculateScrollOvershoot()
1724 {
1725   float overshoot = 0.0f;
1726
1727   if(mActiveLayout)
1728   {
1729     // The overshoot must be calculated from the accumulated pan gesture displacement
1730     // since the pan gesture starts.
1731     Actor self = Self();
1732     float scrollDistance = CalculateScrollDistance(mTotalPanDisplacement, *mActiveLayout) * mActiveLayout->GetScrollSpeedFactor();
1733     float positionDelta = GetCurrentLayoutPosition(0) + scrollDistance;
1734     float minLayoutPosition = mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), Self().GetCurrentSize());
1735     self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1736     float clamppedPosition = min(0.0f, max(minLayoutPosition, positionDelta));
1737     overshoot = positionDelta - clamppedPosition;
1738   }
1739
1740   return overshoot;
1741 }
1742
1743 void ItemView::AnimateScrollOvershoot(float overshootAmount, bool animateBack)
1744 {
1745   bool animatingOn = fabsf(overshootAmount) > Math::MACHINE_EPSILON_1;
1746
1747   // make sure we animate back if needed
1748   mAnimateOvershootOff = animateBack || (!animatingOn && mAnimatingOvershootOn);
1749
1750   if( mAnimatingOvershootOn )
1751   {
1752     // animating on, do not allow animate off
1753     return;
1754   }
1755
1756   Actor self = Self();
1757   float currentOvershoot = mScrollPositionObject.GetProperty<float>(ScrollConnector::OVERSHOOT);
1758   float duration = DEFAULT_OVERSHOOT_ANIMATION_DURATION * (animatingOn ? (1.0f - fabsf(currentOvershoot)) : fabsf(currentOvershoot));
1759
1760   RemoveAnimation(mScrollOvershootAnimation);
1761   mScrollOvershootAnimation = Animation::New(duration);
1762   mScrollOvershootAnimation.FinishedSignal().Connect(this, &ItemView::OnOvershootOnFinished);
1763   mScrollOvershootAnimation.AnimateTo( Property(mScrollPositionObject, ScrollConnector::OVERSHOOT), overshootAmount, TimePeriod(0.0f, duration) );
1764   mScrollOvershootAnimation.Play();
1765
1766   mAnimatingOvershootOn = animatingOn;
1767 }
1768
1769 void ItemView::SetItemsParentOrigin( const Vector3& parentOrigin )
1770 {
1771   if( parentOrigin != mItemsParentOrigin )
1772   {
1773     mItemsParentOrigin = parentOrigin;
1774     for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
1775     {
1776       iter->second.SetParentOrigin(parentOrigin);
1777     }
1778   }
1779 }
1780
1781 Vector3 ItemView::GetItemsParentOrigin() const
1782 {
1783   return mItemsParentOrigin;
1784 }
1785
1786 void ItemView::SetItemsAnchorPoint( const Vector3& anchorPoint )
1787 {
1788   if( anchorPoint != mItemsAnchorPoint )
1789   {
1790     mItemsAnchorPoint = anchorPoint;
1791     for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
1792     {
1793       iter->second.SetAnchorPoint(anchorPoint);
1794     }
1795   }
1796 }
1797
1798 Vector3 ItemView::GetItemsAnchorPoint() const
1799 {
1800   return mItemsAnchorPoint;
1801 }
1802
1803 } // namespace Internal
1804
1805 } // namespace Toolkit
1806
1807 } // namespace Dali