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
  28 using namespace std;
  29 using namespace Dali;
  30
  31 namespace // unnamed namespace
  32 {
  33
  34 //Type registration
  35 TypeRegistration mType( typeid(Toolkit::ItemView), typeid(Toolkit::Scrollable), NULL );
  36
  37 const float DEFAULT_MINIMUM_SWIPE_SPEED = 1.0f;
  38 const float DEFAULT_MINIMUM_SWIPE_DISTANCE = 3.0f;
  39 const float DEFAULT_MOUSE_WHEEL_SCROLL_DISTANCE_STEP_PROPORTION = 0.1f;
  40
  41 const float DEFAULT_REFRESH_INTERVAL_LAYOUT_POSITIONS = 20.0f; // 1 updates per 20 items
  42 const int MOUSE_WHEEL_EVENT_FINISHED_TIME_OUT = 500;  // 0.5 second
  43
  44 const float DEFAULT_ANCHORING_DURATION = 1.0f;  // 1 second
  45 const float DEFAULT_COLOR_VISIBILITY_REMOVE_TIME = 0.5f; // 0.5 second
  46
  47 const float MILLISECONDS_PER_SECONDS = 1000.0f;
  48
  49 const char* OVERSHOOT_OVERLAY_RIPPLE_IMAGE_PATH = DALI_IMAGE_DIR "overshoot_ripple.png";
  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 {
 416   SetRequiresMouseWheelEvents(true);
 417   SetKeyboardNavigationSupport(true);
 418 }
 419
 420 void ItemView::OnInitialize()
 421 {
 422   SetSizePolicy( Toolkit::Control::Fixed, Toolkit::Control::Fixed );
 423
 424   RegisterCommonProperties();
 425
 426   Actor self = Self();
 427
 428   mScrollConnector = Dali::Toolkit::ScrollConnector::New();
 429   mScrollPositionObject = mScrollConnector.GetScrollPositionObject();
 430
 431   mPropertyMinimumLayoutPosition = self.RegisterProperty(MINIMUM_LAYOUT_POSITION_PROPERTY_NAME, 0.0f);
 432   mPropertyPosition = self.RegisterProperty(POSITION_PROPERTY_NAME, 0.0f);
 433   mPropertyScrollSpeed = self.RegisterProperty(SCROLL_SPEED_PROPERTY_NAME, 0.0f);
 434
 435   EnableScrollComponent(Toolkit::Scrollable::OvershootIndicator);
 436
 437   Constraint constraint = Constraint::New<Vector3>(mPropertyRelativePosition,
 438                                                    LocalSource(mPropertyPosition),
 439                                                    LocalSource(mPropertyPositionMin),
 440                                                    LocalSource(mPropertyPositionMax),
 441                                                    LocalSource(Actor::SIZE),
 442                                                    RelativePositionConstraint);
 443   self.ApplyConstraint(constraint);
 444
 445   Vector2 stageSize = Stage::GetCurrent().GetSize();
 446   mMouseWheelScrollDistanceStep = stageSize.y * DEFAULT_MOUSE_WHEEL_SCROLL_DISTANCE_STEP_PROPORTION;
 447
 448   EnableGestureDetection(Gesture::Type(Gesture::Pan));
 449
 450   mMouseWheelEventFinishedTimer = Timer::New( MOUSE_WHEEL_EVENT_FINISHED_TIME_OUT );
 451   mMouseWheelEventFinishedTimer.TickSignal().Connect( this, &ItemView::OnMouseWheelEventFinished );
 452
 453   SetRefreshInterval(mRefreshIntervalLayoutPositions);
 454 }
 455
 456 ItemView::~ItemView()
 457 {
 458 }
 459
 460 Dali::Toolkit::ScrollConnector ItemView::GetScrollConnector() const
 461 {
 462   return mScrollConnector;
 463 }
 464
 465 unsigned int ItemView::GetLayoutCount() const
 466 {
 467   return mLayouts.size();
 468 }
 469
 470 void ItemView::AddLayout(ItemLayout& layout)
 471 {
 472   mLayouts.push_back(ItemLayoutPtr(&layout));
 473 }
 474
 475 void ItemView::RemoveLayout(unsigned int layoutIndex)
 476 {
 477   DALI_ASSERT_ALWAYS(layoutIndex < mLayouts.size());
 478
 479   if (mActiveLayout == mLayouts[layoutIndex].Get())
 480   {
 481     mActiveLayout = NULL;
 482   }
 483
 484   mLayouts.erase(mLayouts.begin() + layoutIndex);
 485 }
 486
 487 ItemLayoutPtr ItemView::GetLayout(unsigned int layoutIndex) const
 488 {
 489   return mLayouts[layoutIndex];
 490 }
 491
 492 ItemLayoutPtr ItemView::GetActiveLayout() const
 493 {
 494   return ItemLayoutPtr(mActiveLayout);
 495 }
 496
 497 float ItemView::GetCurrentLayoutPosition(unsigned int itemId) const
 498 {
 499   return mScrollPositionObject.GetProperty<float>( ScrollConnector::SCROLL_POSITION ) + static_cast<float>( itemId );
 500 }
 501
 502 void ItemView::ActivateLayout(unsigned int layoutIndex, const Vector3& targetSize, float durationSeconds)
 503 {
 504   DALI_ASSERT_ALWAYS(layoutIndex < mLayouts.size());
 505
 506   Actor self = Self();
 507
 508   // The ItemView size should match the active layout size
 509   self.SetSize(targetSize);
 510   mActiveLayoutTargetSize = targetSize;
 511
 512   // Switch to the new layout
 513   mActiveLayout = mLayouts[layoutIndex].Get();
 514
 515   // Move the items to the new layout positions...
 516
 517   bool resizeAnimationNeeded(false);
 518
 519   for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 520   {
 521     unsigned int itemId = iter->first;
 522     Actor actor = iter->second;
 523
 524     // Remove constraints from previous layout
 525     actor.RemoveConstraints();
 526
 527     Vector3 size;
 528     if(mActiveLayout->GetItemSize(itemId, targetSize, size))
 529     {
 530       if( durationSeconds > 0.0f )
 531       {
 532         // Use a size animation
 533         if (!resizeAnimationNeeded)
 534         {
 535           resizeAnimationNeeded = true;
 536           RemoveAnimation(mResizeAnimation);
 537           mResizeAnimation = Animation::New(durationSeconds);
 538         }
 539
 540         // The layout provides its own resize animation
 541         mActiveLayout->GetResizeAnimation(mResizeAnimation, actor, size, durationSeconds);
 542       }
 543       else
 544       {
 545         // resize immediately
 546         actor.SetSize(size);
 547       }
 548     }
 549
 550     ApplyConstraints(actor, *mActiveLayout, itemId, durationSeconds);
 551   }
 552
 553   if (resizeAnimationNeeded)
 554   {
 555     mResizeAnimation.Play();
 556   }
 557
 558   // Refresh the new layout
 559   ItemRange range = GetItemRange(*mActiveLayout, targetSize, GetCurrentLayoutPosition(0), true/*reserve extra*/);
 560   AddActorsWithinRange( range, durationSeconds );
 561
 562   // Scroll to an appropriate layout position
 563
 564   bool scrollAnimationNeeded(false);
 565   float firstItemScrollPosition(0.0f);
 566
 567   float current = GetCurrentLayoutPosition(0);
 568   float minimum = ClampFirstItemPosition(current, targetSize, *mActiveLayout);
 569   self.SetProperty(mPropertyPosition, GetScrollPosition(current, targetSize));
 570
 571   if (current < minimum)
 572   {
 573     scrollAnimationNeeded = true;
 574     firstItemScrollPosition = minimum;
 575   }
 576   else if (mAnchoringEnabled)
 577   {
 578     scrollAnimationNeeded = true;
 579     firstItemScrollPosition = mActiveLayout->GetClosestAnchorPosition(current);
 580   }
 581
 582   if (scrollAnimationNeeded)
 583   {
 584     RemoveAnimation(mScrollAnimation);
 585     mScrollAnimation = Animation::New(mAnchoringDuration);
 586     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
 587     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, targetSize), AlphaFunctions::EaseOut );
 588     mScrollAnimation.Play();
 589   }
 590
 591   self.SetProperty(mPropertyMinimumLayoutPosition, mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), targetSize));
 592   AnimateScrollOvershoot(0.0f);
 593   mScrollOvershoot = 0.0f;
 594
 595   Radian scrollDirection(mActiveLayout->GetScrollDirection());
 596   float orientation = static_cast<float>(mActiveLayout->GetOrientation());
 597   self.SetProperty(mPropertyScrollDirection, Vector3(sinf(scrollDirection), cosf(scrollDirection), orientation));
 598
 599   self.SetProperty(mPropertyScrollSpeed, mScrollSpeed);
 600
 601   CalculateDomainSize(targetSize);
 602 }
 603
 604 void ItemView::DeactivateCurrentLayout()
 605 {
 606   if (mActiveLayout)
 607   {
 608     for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 609     {
 610       Actor actor = iter->second;
 611       actor.RemoveConstraints();
 612     }
 613
 614     mActiveLayout = NULL;
 615   }
 616 }
 617
 618 void ItemView::SetDefaultAlphaFunction(AlphaFunction func)
 619 {
 620   mDefaultAlphaFunction = func;
 621 }
 622
 623 AlphaFunction ItemView::GetDefaultAlphaFunction() const
 624 {
 625   return mDefaultAlphaFunction;
 626 }
 627
 628 void ItemView::OnRefreshNotification(PropertyNotification& source)
 629 {
 630   if(mRefreshEnabled)
 631   {
 632     // Only refresh the cache during normal scrolling
 633     DoRefresh(GetCurrentLayoutPosition(0), true);
 634   }
 635 }
 636
 637 void ItemView::DoRefresh(float currentLayoutPosition, bool cacheExtra)
 638 {
 639   if (mActiveLayout)
 640   {
 641     ItemRange range = GetItemRange(*mActiveLayout, mActiveLayoutTargetSize, currentLayoutPosition, cacheExtra/*reserve extra*/);
 642     RemoveActorsOutsideRange( range );
 643     AddActorsWithinRange( range, 0.0f/*immediate*/ );
 644
 645     mScrollUpdatedSignalV2.Emit( Vector3(0.0f, currentLayoutPosition, 0.0f) );
 646   }
 647 }
 648
 649 void ItemView::SetMinimumSwipeSpeed(float speed)
 650 {
 651   mMinimumSwipeSpeed = speed;
 652 }
 653
 654 float ItemView::GetMinimumSwipeSpeed() const
 655 {
 656   return mMinimumSwipeSpeed;
 657 }
 658
 659 void ItemView::SetMinimumSwipeDistance(float distance)
 660 {
 661   mMinimumSwipeDistance = distance;
 662 }
 663
 664 float ItemView::GetMinimumSwipeDistance() const
 665 {
 666   return mMinimumSwipeDistance;
 667 }
 668
 669 void ItemView::SetMouseWheelScrollDistanceStep(float step)
 670 {
 671   mMouseWheelScrollDistanceStep = step;
 672 }
 673
 674 float ItemView::GetMouseWheelScrollDistanceStep() const
 675 {
 676   return mMouseWheelScrollDistanceStep;
 677 }
 678
 679 void ItemView::SetAnchoring(bool enabled)
 680 {
 681   mAnchoringEnabled = enabled;
 682 }
 683
 684 bool ItemView::GetAnchoring() const
 685 {
 686   return mAnchoringEnabled;
 687 }
 688
 689 void ItemView::SetAnchoringDuration(float durationSeconds)
 690 {
 691   mAnchoringDuration = durationSeconds;
 692 }
 693
 694 float ItemView::GetAnchoringDuration() const
 695 {
 696   return mAnchoringDuration;
 697 }
 698
 699 void ItemView::SetRefreshInterval(float intervalLayoutPositions)
 700 {
 701   mRefreshIntervalLayoutPositions = intervalLayoutPositions;
 702
 703   if(mRefreshNotification)
 704   {
 705     mScrollPositionObject.RemovePropertyNotification(mRefreshNotification);
 706   }
 707   mRefreshNotification = mScrollPositionObject.AddPropertyNotification( ScrollConnector::SCROLL_POSITION, StepCondition(mRefreshIntervalLayoutPositions, 0.0f) );
 708   mRefreshNotification.NotifySignal().Connect( this, &ItemView::OnRefreshNotification );
 709 }
 710
 711 float ItemView::GetRefreshInterval() const
 712 {
 713   return mRefreshIntervalLayoutPositions;
 714 }
 715
 716 void ItemView::SetRefreshEnabled(bool enabled)
 717 {
 718   mRefreshEnabled = enabled;
 719 }
 720
 721 Actor ItemView::GetItem(unsigned int itemId) const
 722 {
 723   Actor actor;
 724
 725   ConstItemPoolIter iter = mItemPool.find( itemId );
 726   if( iter != mItemPool.end() )
 727   {
 728     actor = iter->second;
 729   }
 730
 731   return actor;
 732 }
 733
 734 unsigned int ItemView::GetItemId( Actor actor ) const
 735 {
 736   unsigned int itemId( 0 );
 737
 738   for ( ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter )
 739   {
 740     if( iter->second == actor )
 741     {
 742       itemId = iter->first;
 743       break;
 744     }
 745   }
 746
 747   return itemId;
 748 }
 749
 750 void ItemView::InsertItem( Item newItem, float durationSeconds )
 751 {
 752   mAddingItems = true;
 753
 754   SetupActor( newItem, durationSeconds );
 755   Self().Add( newItem.second );
 756
 757   ItemPoolIter foundIter = mItemPool.find( newItem.first );
 758   if( mItemPool.end() != foundIter )
 759   {
 760     Actor moveMe = foundIter->second;
 761     foundIter->second = newItem.second;
 762
 763     // Move the existing actors to make room
 764     for( ItemPoolIter iter = ++foundIter; mItemPool.end() != iter; ++iter )
 765     {
 766       Actor temp = iter->second;
 767       iter->second = moveMe;
 768       moveMe = temp;
 769
 770       iter->second.RemoveConstraints();
 771       ApplyConstraints( iter->second, *mActiveLayout, iter->first, durationSeconds );
 772     }
 773
 774     // Create last item
 775     ItemId lastId = mItemPool.rbegin()->first;
 776     Item lastItem( lastId + 1, moveMe );
 777     mItemPool.insert( lastItem );
 778
 779     lastItem.second.RemoveConstraints();
 780     ApplyConstraints( lastItem.second, *mActiveLayout, lastItem.first, durationSeconds );
 781   }
 782   else
 783   {
 784     mItemPool.insert( newItem );
 785   }
 786
 787   CalculateDomainSize(Self().GetCurrentSize());
 788
 789   mAddingItems = false;
 790 }
 791
 792 void ItemView::InsertItems( const ItemContainer& newItems, float durationSeconds )
 793 {
 794   mAddingItems = true;
 795
 796   // Insert from lowest id to highest
 797   set<Item> sortedItems;
 798   for( ConstItemIter iter = newItems.begin(); newItems.end() != iter; ++iter )
 799   {
 800     sortedItems.insert( *iter );
 801   }
 802
 803   for( set<Item>::iterator iter = sortedItems.begin(); sortedItems.end() != iter; ++iter )
 804   {
 805     Self().Add( iter->second );
 806
 807     cout << "inserting item: " << iter->first << endl;
 808
 809     ItemPoolIter foundIter = mItemPool.find( iter->first );
 810     if( mItemPool.end() != foundIter )
 811     {
 812       Actor moveMe = foundIter->second;
 813       foundIter->second = iter->second;
 814
 815       // Move the existing actors to make room
 816       for( ItemPoolIter iter = ++foundIter; mItemPool.end() != iter; ++iter )
 817       {
 818         Actor temp = iter->second;
 819         iter->second = moveMe;
 820         moveMe = temp;
 821       }
 822
 823       // Create last item
 824       ItemId lastId = mItemPool.rbegin()->first;
 825       Item lastItem( lastId + 1, moveMe );
 826       mItemPool.insert( lastItem );
 827     }
 828     else
 829     {
 830       mItemPool.insert( *iter );
 831     }
 832   }
 833
 834   // Relayout everything
 835   for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
 836   {
 837     // If newly inserted
 838     if( FindById( newItems, iter->first ) )
 839     {
 840       SetupActor( *iter, durationSeconds );
 841     }
 842     else
 843     {
 844       iter->second.RemoveConstraints();
 845       ApplyConstraints( iter->second, *mActiveLayout, iter->first, durationSeconds );
 846     }
 847   }
 848
 849   CalculateDomainSize(Self().GetCurrentSize());
 850
 851   mAddingItems = false;
 852 }
 853
 854 void ItemView::RemoveItem( unsigned int itemId, float durationSeconds )
 855 {
 856   bool actorRemoved = RemoveActor( itemId );
 857   if( actorRemoved )
 858   {
 859     ReapplyAllConstraints( durationSeconds );
 860   }
 861 }
 862
 863 void ItemView::RemoveItems( const ItemIdContainer& itemIds, float durationSeconds )
 864 {
 865   bool actorRemoved( false );
 866
 867   // Remove from highest id to lowest
 868   set<ItemId> sortedItems;
 869   for( ConstItemIdIter iter = itemIds.begin(); itemIds.end() != iter; ++iter )
 870   {
 871     sortedItems.insert( *iter );
 872   }
 873
 874   for( set<ItemId>::reverse_iterator iter = sortedItems.rbegin(); sortedItems.rend() != iter; ++iter )
 875   {
 876     if( RemoveActor( *iter ) )
 877     {
 878       actorRemoved = true;
 879     }
 880   }
 881
 882   if( actorRemoved )
 883   {
 884     ReapplyAllConstraints( durationSeconds );
 885   }
 886 }
 887
 888 bool ItemView::RemoveActor(unsigned int itemId)
 889 {
 890   bool removed( false );
 891
 892   const ItemPoolIter removeIter = mItemPool.find( itemId );
 893
 894   if( removeIter != mItemPool.end() )
 895   {
 896     Self().Remove( removeIter->second );
 897     removed = true;
 898
 899     // Adjust the remaining item IDs, for example if item 2 is removed:
 900     //   Initial actors:     After insert:
 901     //     ID 1 - ActorA       ID 1 - ActorA
 902     //     ID 2 - ActorB       ID 2 - ActorC (previously ID 3)
 903     //     ID 3 - ActorC       ID 3 - ActorB (previously ID 4)
 904     //     ID 4 - ActorD
 905     for (ItemPoolIter iter = removeIter; iter != mItemPool.end(); ++iter)
 906     {
 907       if( iter->first < mItemPool.rbegin()->first )
 908       {
 909         iter->second = mItemPool[ iter->first + 1 ];
 910       }
 911       else
 912       {
 913         mItemPool.erase( iter );
 914         break;
 915       }
 916     }
 917   }
 918
 919   return removed;
 920 }
 921
 922 void ItemView::ReplaceItem( Item replacementItem, float durationSeconds )
 923 {
 924   mAddingItems = true;
 925
 926   SetupActor( replacementItem, durationSeconds );
 927   Self().Add( replacementItem.second );
 928
 929   const ItemPoolIter iter = mItemPool.find( replacementItem.first );
 930   if( mItemPool.end() != iter )
 931   {
 932     Self().Remove( iter->second );
 933     iter->second = replacementItem.second;
 934   }
 935   else
 936   {
 937     mItemPool.insert( replacementItem );
 938   }
 939
 940   CalculateDomainSize(Self().GetCurrentSize());
 941
 942   mAddingItems = false;
 943 }
 944
 945 void ItemView::ReplaceItems( const ItemContainer& replacementItems, float durationSeconds )
 946 {
 947   for( ConstItemIter iter = replacementItems.begin(); replacementItems.end() != iter; ++iter )
 948   {
 949     ReplaceItem( *iter, durationSeconds );
 950   }
 951 }
 952
 953 void ItemView::RemoveActorsOutsideRange( ItemRange range )
 954 {
 955   // Remove unwanted actors from the ItemView & ItemPool
 956   for (ItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); )
 957   {
 958     unsigned int current = iter->first;
 959
 960     if( ! range.Within( current ) )
 961     {
 962       Self().Remove( iter->second );
 963
 964       mItemPool.erase( iter++ ); // erase invalidates the return value of post-increment; iter remains valid
 965     }
 966     else
 967     {
 968       ++iter;
 969     }
 970   }
 971 }
 972
 973 void ItemView::AddActorsWithinRange( ItemRange range, float durationSeconds )
 974 {
 975   range.end = min(mItemFactory.GetNumberOfItems(), range.end);
 976
 977   // The order of addition depends on the scroll direction.
 978   if (mRefreshOrderHint)
 979   {
 980     for (unsigned int itemId = range.begin; itemId < range.end; ++itemId)
 981     {
 982       AddNewActor( itemId, durationSeconds );
 983     }
 984   }
 985   else
 986   {
 987     for (unsigned int itemId = range.end; itemId > range.begin; --itemId)
 988     {
 989       AddNewActor( itemId-1, durationSeconds );
 990     }
 991   }
 992
 993   // Total number of items may change dynamically.
 994   // Always recalculate the domain size to reflect that.
 995   CalculateDomainSize(Self().GetCurrentSize());
 996 }
 997
 998 void ItemView::AddNewActor( unsigned int itemId, float durationSeconds )
 999 {
1000   mAddingItems = true;
1001
1002   if( mItemPool.end() == mItemPool.find( itemId ) )
1003   {
1004     Actor actor = mItemFactory.NewItem( itemId );
1005
1006     if( actor )
1007     {
1008       Item newItem( itemId, actor );
1009
1010       mItemPool.insert( newItem );
1011
1012       SetupActor( newItem, durationSeconds );
1013       Self().Add( actor );
1014     }
1015   }
1016
1017   mAddingItems = false;
1018 }
1019
1020 void ItemView::SetupActor( Item item, float durationSeconds )
1021 {
1022   item.second.SetParentOrigin( ParentOrigin::CENTER );
1023   item.second.SetAnchorPoint( AnchorPoint::CENTER );
1024
1025   if( mActiveLayout )
1026   {
1027     Vector3 size;
1028     if( mActiveLayout->GetItemSize( item.first, mActiveLayoutTargetSize, size ) )
1029     {
1030       item.second.SetSize( size );
1031     }
1032
1033     ApplyConstraints( item.second, *mActiveLayout, item.first, durationSeconds );
1034   }
1035 }
1036
1037 ItemRange ItemView::GetItemRange(ItemLayout& layout, const Vector3& layoutSize, float layoutPosition, bool reserveExtra)
1038 {
1039   unsigned int itemCount = mItemFactory.GetNumberOfItems();
1040
1041   ItemRange available(0u, itemCount);
1042
1043   ItemRange range = layout.GetItemsWithinArea( layoutPosition, layoutSize );
1044
1045   if (reserveExtra)
1046   {
1047     // Add the reserve items for scrolling
1048     unsigned int extra = layout.GetReserveItemCount(layoutSize);
1049     range.begin = (range.begin >= extra) ? (range.begin - extra) : 0u;
1050     range.end += extra;
1051   }
1052
1053   return range.Intersection(available);
1054 }
1055
1056 void ItemView::OnChildAdd(Actor& child)
1057 {
1058   if(!mAddingItems)
1059   {
1060     // We don't want to do this downcast check for any item added by ItemView itself.
1061     Dali::Toolkit::ScrollComponent scrollComponent = Dali::Toolkit::ScrollComponent::DownCast(child);
1062     if(scrollComponent)
1063     {
1064       // Set the scroll connector when scroll bar is being added
1065       scrollComponent.SetScrollConnector(mScrollConnector);
1066     }
1067   }
1068 }
1069
1070 bool ItemView::OnTouchEvent(const TouchEvent& event)
1071 {
1072   // Ignore events with multiple-touch points
1073   if (event.GetPointCount() != 1)
1074   {
1075     return false;
1076   }
1077
1078   if (event.GetPoint(0).state == TouchPoint::Down)
1079   {
1080     // Cancel ongoing scrolling etc.
1081     mGestureState = Gesture::Clear;
1082
1083     mScrollDistance = 0.0f;
1084     mScrollSpeed = 0.0f;
1085     Self().SetProperty(mPropertyScrollSpeed, mScrollSpeed);
1086
1087     mScrollOvershoot = 0.0f;
1088     AnimateScrollOvershoot(0.0f);
1089
1090     mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1091
1092     RemoveAnimation(mScrollAnimation);
1093   }
1094
1095   return true; // consume since we're potentially scrolling
1096 }
1097
1098 bool ItemView::OnMouseWheelEvent(const MouseWheelEvent& event)
1099 {
1100   // Respond the mouse wheel event to scroll
1101   if (mActiveLayout)
1102   {
1103     Actor self = Self();
1104     const Vector3 layoutSize = Self().GetCurrentSize();
1105     float layoutPositionDelta = GetCurrentLayoutPosition(0) + (event.z * mMouseWheelScrollDistanceStep * mActiveLayout->GetScrollSpeedFactor());
1106     float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
1107
1108     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1109     self.SetProperty(mPropertyPosition, GetScrollPosition(firstItemScrollPosition, layoutSize));
1110     mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1111   }
1112
1113   if (mMouseWheelEventFinishedTimer.IsRunning())
1114   {
1115     mMouseWheelEventFinishedTimer.Stop();
1116   }
1117
1118   mMouseWheelEventFinishedTimer.Start();
1119
1120   return true;
1121 }
1122
1123 bool ItemView::OnMouseWheelEventFinished()
1124 {
1125   if (mActiveLayout)
1126   {
1127     RemoveAnimation(mScrollAnimation);
1128
1129     // No more mouse wheel events coming. Do the anchoring if enabled.
1130     mScrollAnimation = DoAnchoring();
1131     if (mScrollAnimation)
1132     {
1133       mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1134       mScrollAnimation.Play();
1135     }
1136     else
1137     {
1138       mScrollOvershoot = 0.0f;
1139       AnimateScrollOvershoot(0.0f);
1140
1141       mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1142     }
1143   }
1144
1145   return false;
1146 }
1147
1148 void ItemView::ApplyConstraints(Actor& actor, ItemLayout& layout, unsigned int itemId, float duration)
1149 {
1150   ItemLayout::Vector3Function positionConstraint;
1151   if (layout.GetPositionConstraint(itemId, positionConstraint))
1152   {
1153     WrappedVector3Constraint wrapped(positionConstraint, itemId);
1154
1155     Constraint constraint = Constraint::New<Vector3>( Actor::POSITION,
1156                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1157                                                       ParentSource( mPropertyScrollSpeed ),
1158                                                       ParentSource( Actor::SIZE ),
1159                                                       wrapped );
1160     constraint.SetApplyTime(duration);
1161     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1162
1163     actor.ApplyConstraint(constraint);
1164   }
1165
1166   ItemLayout::QuaternionFunction rotationConstraint;
1167   if (layout.GetRotationConstraint(itemId, rotationConstraint))
1168   {
1169     WrappedQuaternionConstraint wrapped(rotationConstraint, itemId);
1170
1171     Constraint constraint = Constraint::New<Quaternion>( Actor::ROTATION,
1172                                                          Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1173                                                          ParentSource( mPropertyScrollSpeed ),
1174                                                          ParentSource( Actor::SIZE ),
1175                                                          wrapped );
1176     constraint.SetApplyTime(duration);
1177     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1178
1179     actor.ApplyConstraint(constraint);
1180   }
1181
1182   ItemLayout::Vector3Function scaleConstraint;
1183   if (layout.GetScaleConstraint(itemId, scaleConstraint))
1184   {
1185     WrappedVector3Constraint wrapped(scaleConstraint, itemId);
1186
1187     Constraint constraint = Constraint::New<Vector3>( Actor::SCALE,
1188                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1189                                                       ParentSource( mPropertyScrollSpeed ),
1190                                                       ParentSource( Actor::SIZE ),
1191                                                       wrapped );
1192     constraint.SetApplyTime(duration);
1193     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1194
1195     actor.ApplyConstraint(constraint);
1196   }
1197
1198   ItemLayout::Vector4Function colorConstraint;
1199   if (layout.GetColorConstraint(itemId, colorConstraint))
1200   {
1201     WrappedVector4Constraint wrapped(colorConstraint, itemId);
1202
1203     Constraint constraint = Constraint::New<Vector4>( Actor::COLOR,
1204                                                       Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1205                                                       ParentSource( mPropertyScrollSpeed ),
1206                                                       ParentSource( Actor::SIZE ),
1207                                                       wrapped );
1208     constraint.SetApplyTime(duration);
1209     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1210
1211     // Release color constraints slowly; this allows ItemView to co-exist with ImageActor fade-in
1212     constraint.SetRemoveTime(DEFAULT_COLOR_VISIBILITY_REMOVE_TIME);
1213     constraint.SetRemoveAction(Dali::Constraint::Discard);
1214
1215     actor.ApplyConstraint(constraint);
1216   }
1217
1218   ItemLayout::BoolFunction visibilityConstraint;
1219   if (layout.GetVisibilityConstraint(itemId, visibilityConstraint))
1220   {
1221     WrappedBoolConstraint wrapped(visibilityConstraint, itemId);
1222
1223     Constraint constraint = Constraint::New<bool>( Actor::VISIBLE,
1224                                                    Source( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ),
1225                                                    ParentSource( mPropertyScrollSpeed ),
1226                                                    ParentSource( Actor::SIZE ),
1227                                                    wrapped );
1228     constraint.SetApplyTime(duration);
1229     constraint.SetAlphaFunction(mDefaultAlphaFunction);
1230
1231     // Release visibility constraints the same time as the color constraint
1232     constraint.SetRemoveTime(DEFAULT_COLOR_VISIBILITY_REMOVE_TIME);
1233     constraint.SetRemoveAction(Dali::Constraint::Discard);
1234
1235     actor.ApplyConstraint(constraint);
1236   }
1237 }
1238
1239 void ItemView::ReapplyAllConstraints( float durationSeconds )
1240 {
1241   for (ConstItemPoolIter iter = mItemPool.begin(); iter != mItemPool.end(); ++iter)
1242   {
1243     unsigned int id = iter->first;
1244     Actor actor = iter->second;
1245
1246     actor.RemoveConstraints();
1247     ApplyConstraints(actor, *mActiveLayout, id, durationSeconds);
1248   }
1249
1250   CalculateDomainSize(Self().GetCurrentSize());
1251 }
1252
1253 float ItemView::ClampFirstItemPosition(float targetPosition, const Vector3& targetSize, ItemLayout& layout)
1254 {
1255   Actor self = Self();
1256   float minLayoutPosition = layout.GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), targetSize);
1257   float clamppedPosition = min(0.0f, max(minLayoutPosition, targetPosition));
1258   mScrollOvershoot = targetPosition - clamppedPosition;
1259   self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1260
1261   return clamppedPosition;
1262 }
1263
1264 void ItemView::OnPan(PanGesture gesture)
1265 {
1266   Actor self = Self();
1267   const Vector3 layoutSize = Self().GetCurrentSize();
1268
1269   RemoveAnimation(mScrollAnimation);
1270
1271   // Short-circuit if there is no active layout
1272   if (!mActiveLayout)
1273   {
1274     mGestureState = Gesture::Clear;
1275     return;
1276   }
1277
1278   mGestureState = gesture.state;
1279
1280   switch (mGestureState)
1281   {
1282     case Gesture::Finished:
1283     {
1284       // Swipe Detection
1285       if (fabsf(mScrollDistance) > mMinimumSwipeDistance &&
1286           mScrollSpeed > mMinimumSwipeSpeed)
1287       {
1288         float direction = (mScrollDistance < 0.0f) ? -1.0f : 1.0f;
1289
1290         mRefreshOrderHint = true;
1291
1292         float currentLayoutPosition = GetCurrentLayoutPosition(0);
1293         float firstItemScrollPosition = ClampFirstItemPosition(currentLayoutPosition + mScrollSpeed * direction,
1294                                                                layoutSize,
1295                                                                *mActiveLayout);
1296
1297         if (mAnchoringEnabled)
1298         {
1299           firstItemScrollPosition = mActiveLayout->GetClosestAnchorPosition(firstItemScrollPosition);
1300         }
1301
1302         RemoveAnimation(mScrollAnimation);
1303
1304         float flickAnimationDuration = mActiveLayout->GetItemFlickAnimationDuration() * max(1.0f, fabsf(firstItemScrollPosition - GetCurrentLayoutPosition(0)));
1305         mScrollAnimation = Animation::New(flickAnimationDuration);
1306         mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1307         mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1308         mScrollAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), 0.0f, AlphaFunctions::EaseOut );
1309
1310         mIsFlicking = true;
1311         // Check whether it has already scrolled to the end
1312         if(fabs(currentLayoutPosition - firstItemScrollPosition) > Math::MACHINE_EPSILON_0)
1313         {
1314           AnimateScrollOvershoot(0.0f);
1315         }
1316       }
1317
1318       // Anchoring may be triggered when there was no swipe
1319       if (!mScrollAnimation)
1320       {
1321         mScrollAnimation = DoAnchoring();
1322       }
1323
1324       // Reset the overshoot if no scroll animation.
1325       if (!mScrollAnimation)
1326       {
1327         mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1328
1329         AnimateScrollOvershoot(0.0f, false);
1330       }
1331     }
1332     break;
1333
1334     case Gesture::Started: // Fall through
1335     {
1336       mTotalPanDisplacement = Vector2::ZERO;
1337     }
1338
1339     case Gesture::Continuing:
1340     {
1341       mScrollDistance = CalculateScrollDistance(gesture.displacement, *mActiveLayout);
1342       mScrollSpeed = Clamp((gesture.GetSpeed() * mActiveLayout->GetScrollSpeedFactor() * MILLISECONDS_PER_SECONDS), 0.0f, mActiveLayout->GetMaximumSwipeSpeed());
1343
1344       // Refresh order depends on the direction of the scroll; negative is towards the last item.
1345       mRefreshOrderHint = mScrollDistance < 0.0f;
1346
1347       RemoveAnimation(mScrollSpeedAnimation);
1348       mScrollSpeedAnimation = Animation::New(0.3f);
1349       mScrollSpeedAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), mScrollSpeed, AlphaFunctions::Linear );
1350       mScrollSpeedAnimation.Play();
1351
1352       float layoutPositionDelta = GetCurrentLayoutPosition(0) + (mScrollDistance * mActiveLayout->GetScrollSpeedFactor());
1353
1354       float firstItemScrollPosition = ClampFirstItemPosition(layoutPositionDelta, layoutSize, *mActiveLayout);
1355
1356       mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1357       self.SetProperty(mPropertyPosition, GetScrollPosition(firstItemScrollPosition, layoutSize));
1358       mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1359
1360       mTotalPanDisplacement += gesture.displacement;
1361       mScrollOvershoot = layoutPositionDelta - firstItemScrollPosition;
1362       if( mScrollOvershoot > Math::MACHINE_EPSILON_1 )
1363       {
1364         AnimateScrollOvershoot(1.0f);
1365       }
1366       else if( mScrollOvershoot < -Math::MACHINE_EPSILON_1 )
1367       {
1368         AnimateScrollOvershoot(-1.0f);
1369       }
1370       else
1371       {
1372         AnimateScrollOvershoot(0.0f);
1373       }
1374     }
1375     break;
1376
1377     case Gesture::Cancelled:
1378     {
1379       mScrollAnimation = DoAnchoring();
1380     }
1381     break;
1382
1383     default:
1384       break;
1385   }
1386
1387   if (mScrollAnimation)
1388   {
1389     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1390     mScrollAnimation.Play();
1391   }
1392 }
1393
1394 bool ItemView::OnAccessibilityPan(PanGesture gesture)
1395 {
1396   OnPan(gesture);
1397   return true;
1398 }
1399
1400 Actor ItemView::GetNextKeyboardFocusableActor(Actor actor, Control::KeyboardFocusNavigationDirection direction, bool loopEnabled)
1401 {
1402   Actor nextFocusActor;
1403   if(mActiveLayout)
1404   {
1405     int nextItemID = 0;
1406     if(!actor || actor == this->Self())
1407     {
1408       nextFocusActor = GetItem(nextItemID);
1409     }
1410     else if(actor && actor.GetParent() == this->Self())
1411     {
1412       int itemID = GetItemId(actor);
1413       nextItemID = mActiveLayout->GetNextFocusItemID(itemID, mItemFactory.GetNumberOfItems(), direction, loopEnabled);
1414       nextFocusActor = GetItem(nextItemID);
1415       if(nextFocusActor == actor)
1416       {
1417         // need to pass NULL actor back to focus manager
1418         nextFocusActor.Reset();
1419         return nextFocusActor;
1420       }
1421     }
1422     float layoutPosition = mActiveLayout->GetClosestAnchorPosition( GetCurrentLayoutPosition(0) );
1423     Vector3 layoutSize = Self().GetCurrentSize();
1424     if(!nextFocusActor)
1425     {
1426       // likely the current item is not buffered, so not in our item pool, probably best to get first viewable item
1427       ItemRange viewableItems = mActiveLayout->GetItemsWithinArea(layoutPosition, layoutSize);
1428       nextItemID = viewableItems.begin;
1429       nextFocusActor = GetItem(nextItemID);
1430     }
1431   }
1432   return nextFocusActor;
1433 }
1434
1435 void ItemView::OnKeyboardFocusChangeCommitted(Actor commitedFocusableActor)
1436 {
1437   // only in this function if our chosen focus actor was actually used
1438   if(commitedFocusableActor)
1439   {
1440     int nextItemID = GetItemId(commitedFocusableActor);
1441     float layoutPosition = GetCurrentLayoutPosition(0);
1442     Vector3 layoutSize = Self().GetCurrentSize();
1443     Vector3 focusItemPosition = Vector3::ZERO;
1444     ItemLayout::Vector3Function itemPositionConstraint;
1445     if (mActiveLayout->GetPositionConstraint(nextItemID, itemPositionConstraint))
1446     {
1447       focusItemPosition = itemPositionConstraint(Vector3::ZERO, layoutPosition + nextItemID, 0.0f, layoutSize);
1448     }
1449
1450     float scrollTo = mActiveLayout->GetClosestOnScreenLayoutPosition(nextItemID, layoutPosition, layoutSize);
1451     ScrollTo(Vector3(0.0f, scrollTo, 0.0f), DEFAULT_KEYBOARD_FOCUS_SCROLL_DURATION);
1452   }
1453 }
1454
1455 Animation ItemView::DoAnchoring()
1456 {
1457   Animation anchoringAnimation;
1458   Actor self = Self();
1459
1460   if (mActiveLayout && mAnchoringEnabled)
1461   {
1462     float anchorPosition = mActiveLayout->GetClosestAnchorPosition( GetCurrentLayoutPosition(0) );
1463
1464     anchoringAnimation = Animation::New(mAnchoringDuration);
1465     anchoringAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), anchorPosition, AlphaFunctions::EaseOut );
1466     anchoringAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(anchorPosition, self.GetCurrentSize()), AlphaFunctions::EaseOut );
1467     anchoringAnimation.AnimateTo( Property(self, mPropertyScrollSpeed), 0.0f, AlphaFunctions::EaseOut );
1468     if(!mIsFlicking)
1469     {
1470       AnimateScrollOvershoot(0.0f);
1471     }
1472   }
1473
1474   return anchoringAnimation;
1475 }
1476
1477 void ItemView::OnScrollFinished(Animation& source)
1478 {
1479   Actor self = Self();
1480
1481   RemoveAnimation(mScrollAnimation); // mScrollAnimation is used to query whether we're scrolling
1482
1483   mScrollCompletedSignalV2.Emit(GetCurrentScrollPosition());
1484
1485   if(mIsFlicking && fabsf(mScrollOvershoot) > Math::MACHINE_EPSILON_1)
1486   {
1487     AnimateScrollOvershoot( mScrollOvershoot > 0.0f ? 1.0f : -1.0f, true);
1488   }
1489   else
1490   {
1491     // Reset the overshoot
1492     AnimateScrollOvershoot( 0.0f );
1493   }
1494   mIsFlicking = false;
1495
1496   mScrollOvershoot = 0.0f;
1497 }
1498
1499 void ItemView::OnOvershootOnFinished(Animation& animation)
1500 {
1501   mAnimatingOvershootOn = false;
1502   mScrollOvershootAnimation.FinishedSignal().Disconnect(this, &ItemView::OnOvershootOnFinished);
1503   RemoveAnimation(mScrollOvershootAnimation);
1504   if(mAnimateOvershootOff)
1505   {
1506     AnimateScrollOvershoot(0.0f);
1507   }
1508 }
1509
1510 void ItemView::ScrollToItem(unsigned int itemId, float durationSeconds)
1511 {
1512   Actor self = Self();
1513   const Vector3 layoutSize = Self().GetCurrentSize();
1514   float firstItemScrollPosition = ClampFirstItemPosition(mActiveLayout->GetItemScrollToPosition(itemId), layoutSize, *mActiveLayout);
1515
1516   if(durationSeconds > 0.0f)
1517   {
1518     RemoveAnimation(mScrollAnimation);
1519     mScrollAnimation = Animation::New(durationSeconds);
1520     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1521     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1522     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1523     mScrollAnimation.Play();
1524   }
1525   else
1526   {
1527     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1528     AnimateScrollOvershoot(0.0f);
1529   }
1530
1531   mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1532 }
1533
1534 void ItemView::RemoveAnimation(Animation& animation)
1535 {
1536   if(animation)
1537   {
1538     // Cease animating, and reset handle.
1539     animation.Clear();
1540     animation.Reset();
1541   }
1542 }
1543
1544 void ItemView::CalculateDomainSize(const Vector3& layoutSize)
1545 {
1546   Actor self = Self();
1547
1548   Vector3 firstItemPosition(Vector3::ZERO);
1549   Vector3 lastItemPosition(Vector3::ZERO);
1550
1551   if(mActiveLayout)
1552   {
1553     ItemLayout::Vector3Function firstItemPositionConstraint;
1554     if (mActiveLayout->GetPositionConstraint(0, firstItemPositionConstraint))
1555     {
1556       firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, 0, 0.0f, layoutSize);
1557     }
1558
1559     float minLayoutPosition = mActiveLayout->GetMinimumLayoutPosition(mItemFactory.GetNumberOfItems(), layoutSize);
1560     self.SetProperty(mPropertyMinimumLayoutPosition, minLayoutPosition);
1561
1562     ItemLayout::Vector3Function lastItemPositionConstraint;
1563     if (mActiveLayout->GetPositionConstraint(fabs(minLayoutPosition), lastItemPositionConstraint))
1564     {
1565       lastItemPosition = lastItemPositionConstraint(Vector3::ZERO, fabs(minLayoutPosition), 0.0f, layoutSize);
1566     }
1567
1568     float domainSize;
1569
1570     if(IsHorizontal(mActiveLayout->GetOrientation()))
1571     {
1572       self.SetProperty(mPropertyPositionMin, Vector3(0.0f, firstItemPosition.x, 0.0f));
1573       self.SetProperty(mPropertyPositionMax, Vector3(0.0f, lastItemPosition.x, 0.0f));
1574       domainSize = fabs(firstItemPosition.x - lastItemPosition.x);
1575     }
1576     else
1577     {
1578       self.SetProperty(mPropertyPositionMin, Vector3(0.0f, firstItemPosition.y, 0.0f));
1579       self.SetProperty(mPropertyPositionMax, Vector3(0.0f, lastItemPosition.y, 0.0f));
1580       domainSize = fabs(firstItemPosition.y - lastItemPosition.y);
1581     }
1582
1583     mScrollConnector.SetScrollDomain(minLayoutPosition, 0.0f, domainSize);
1584
1585     bool isLayoutScrollable = IsLayoutScrollable(layoutSize);
1586     self.SetProperty(mPropertyCanScrollVertical, isLayoutScrollable);
1587     self.SetProperty(mPropertyCanScrollHorizontal, false);
1588   }
1589 }
1590
1591 Vector3 ItemView::GetDomainSize() const
1592 {
1593   Actor self = Self();
1594
1595   float minScrollPosition = self.GetProperty<float>(mPropertyPositionMin);
1596   float maxScrollPosition = self.GetProperty<float>(mPropertyPositionMax);
1597
1598   return Vector3(0.0f, fabs(maxScrollPosition - minScrollPosition), 0.0f);
1599 }
1600
1601 bool ItemView::IsLayoutScrollable(const Vector3& layoutSize)
1602 {
1603   Actor self = Self();
1604
1605   float currentLayoutPosition = ClampFirstItemPosition( GetCurrentLayoutPosition(0), layoutSize, *mActiveLayout );
1606   float forwardClampedPosition = ClampFirstItemPosition(currentLayoutPosition + 1.0, layoutSize, *mActiveLayout);
1607   float backwardClampedPosition = ClampFirstItemPosition(currentLayoutPosition - 1.0, layoutSize, *mActiveLayout);
1608
1609   return (fabs(forwardClampedPosition - backwardClampedPosition) > Math::MACHINE_EPSILON_0);
1610 }
1611
1612 float ItemView::GetScrollPosition(float layoutPosition, const Vector3& layoutSize) const
1613 {
1614   Vector3 firstItemPosition(Vector3::ZERO);
1615   ItemLayout::Vector3Function firstItemPositionConstraint;
1616   if (mActiveLayout->GetPositionConstraint(0, firstItemPositionConstraint))
1617   {
1618     firstItemPosition = firstItemPositionConstraint(Vector3::ZERO, layoutPosition, 0.0f, layoutSize);
1619   }
1620
1621   return IsHorizontal(mActiveLayout->GetOrientation()) ? firstItemPosition.x: firstItemPosition.y;
1622 }
1623
1624 Vector3 ItemView::GetCurrentScrollPosition() const
1625 {
1626   float currentLayoutPosition = GetCurrentLayoutPosition(0);
1627   return Vector3(0.0f, GetScrollPosition(currentLayoutPosition, Self().GetCurrentSize()), 0.0f);
1628 }
1629
1630 void ItemView::AddOverlay(Actor actor)
1631 {
1632   Self().Add(actor);
1633 }
1634
1635 void ItemView::RemoveOverlay(Actor actor)
1636 {
1637   Self().Remove(actor);
1638 }
1639
1640 void ItemView::ScrollTo(const Vector3& position, float duration)
1641 {
1642   Actor self = Self();
1643   const Vector3 layoutSize = Self().GetCurrentSize();
1644
1645   float firstItemScrollPosition = ClampFirstItemPosition(position.y, layoutSize, *mActiveLayout);
1646
1647   if(duration > 0.0f)
1648   {
1649     RemoveAnimation(mScrollAnimation);
1650     mScrollAnimation = Animation::New(duration);
1651     mScrollAnimation.AnimateTo( Property( mScrollPositionObject, ScrollConnector::SCROLL_POSITION ), firstItemScrollPosition, AlphaFunctions::EaseOut );
1652     mScrollAnimation.AnimateTo( Property(self, mPropertyPosition), GetScrollPosition(firstItemScrollPosition, layoutSize), AlphaFunctions::EaseOut );
1653     mScrollAnimation.FinishedSignal().Connect(this, &ItemView::OnScrollFinished);
1654     mScrollAnimation.Play();
1655   }
1656   else
1657   {
1658     mScrollPositionObject.SetProperty( ScrollConnector::SCROLL_POSITION, firstItemScrollPosition );
1659     AnimateScrollOvershoot(0.0f);
1660   }
1661
1662   mScrollStartedSignalV2.Emit(GetCurrentScrollPosition());
1663 }
1664
1665 void ItemView::SetOvershootEnabled( bool enable )
1666 {
1667   Actor self = Self();
1668   if( enable )
1669   {
1670     mOvershootEffect = OvershootRippleEffect::New();
1671     Image overshootImage = Image::New( OVERSHOOT_OVERLAY_RIPPLE_IMAGE_PATH );
1672     mOvershootOverlay = ImageActor::New( overshootImage );
1673     mOvershootOverlay.SetParentOrigin(ParentOrigin::TOP_LEFT);
1674     mOvershootOverlay.SetAnchorPoint(AnchorPoint::TOP_LEFT);
1675     mOvershootOverlay.SetDrawMode(DrawMode::OVERLAY);
1676     mOvershootOverlay.SetShaderEffect(mOvershootEffect);
1677     mOvershootOverlay.SetPixelArea(OVERSHOOT_BOUNCE_IMAGE_1_PIXEL_AREA);
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.GetOvershootPropertyName());
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 } // namespace Internal
1770
1771 } // namespace Toolkit
1772
1773 } // namespace Dali