X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=dali-toolkit%2Fpublic-api%2Fcontrols%2Fscrollable%2Fitem-view%2Fitem-layout.cpp;h=6b570ccf57fc15735d3fbf9a3927852205109fc6;hb=ac9c307fe5d0ab147938397a7d078fb858cc1f4b;hp=81f50bc5fd87335871309e12bc4ee90bef0a09c2;hpb=68106e2cbb8541c18a77f39770ea7759f44e02a0;p=platform%2Fcore%2Fuifw%2Fdali-toolkit.git

diff --git a/dali-toolkit/public-api/controls/scrollable/item-view/item-layout.cpp b/dali-toolkit/public-api/controls/scrollable/item-view/item-layout.cpp
index 81f50bc..6b570cc 100644
--- a/dali-toolkit/public-api/controls/scrollable/item-view/item-layout.cpp
+++ b/dali-toolkit/public-api/controls/scrollable/item-view/item-layout.cpp
@@ -29,11 +29,11 @@
 namespace
 {
 
-// Lerps between current and target using the progress
+// Lerps between initial and target using the progress
 template< typename Type >
-void Lerp( Type& current, const Type& target, float progress )
+void Lerp( Type& current, const Type& initial, const Type& target, float progress )
 {
-  current += ((target - current) * progress);
+  current = initial + ((target - initial) * progress);
 }
 
 // Functors which wrap constraint functions with stored item IDs
@@ -41,7 +41,8 @@ struct WrappedQuaternionConstraint
 {
   WrappedQuaternionConstraint( Dali::Toolkit::ItemLayout::QuaternionFunction wrapMe, unsigned int itemId )
   :mWrapMe(wrapMe),
-   mItemId(itemId)
+   mItemId(itemId),
+   mInitialised( false )
   {
   }
 
@@ -50,18 +51,28 @@ struct WrappedQuaternionConstraint
     float offsetLayoutPosition = inputs[0]->GetFloat() + static_cast<float>(mItemId);
     float weight = inputs[3]->GetFloat();
 
-    current = Dali::Quaternion::Slerp( current, mWrapMe( current, offsetLayoutPosition, inputs[1]->GetFloat(), inputs[2]->GetVector3() ), weight );
+    if( !mInitialised )
+    {
+      mInitialised = true;
+      mInitial = current;
+    }
+
+    current = Dali::Quaternion::Slerp( mInitial, mWrapMe( current, offsetLayoutPosition, inputs[1]->GetFloat(), inputs[2]->GetVector3() ), weight );
   }
 
   Dali::Toolkit::ItemLayout::QuaternionFunction mWrapMe;
   unsigned int mItemId;
+  Dali::Quaternion mInitial;
+  bool mInitialised:1;
 };
 
 struct WrappedVector3Constraint
 {
   WrappedVector3Constraint( Dali::Toolkit::ItemLayout::Vector3Function wrapMe, unsigned int itemId )
   : mWrapMe(wrapMe),
-    mItemId(itemId)
+    mItemId(itemId),
+    mInitial(),
+    mInitialised( false )
   {
   }
 
@@ -70,18 +81,28 @@ struct WrappedVector3Constraint
     float offsetLayoutPosition = inputs[0]->GetFloat() + static_cast<float>(mItemId);
     float weight = inputs[3]->GetFloat();
 
-    Lerp( current, mWrapMe( current, offsetLayoutPosition, inputs[1]->GetFloat(), inputs[2]->GetVector3() ), weight );
+    if( !mInitialised )
+    {
+      mInitialised = true;
+      mInitial = current;
+    }
+
+    Lerp( current, mInitial, mWrapMe( current, offsetLayoutPosition, inputs[1]->GetFloat(), inputs[2]->GetVector3() ), weight );
   }
 
   Dali::Toolkit::ItemLayout::Vector3Function mWrapMe;
   unsigned int mItemId;
+  Dali::Vector3 mInitial;
+  bool mInitialised:1;
 };
 
 struct WrappedVector4Constraint
 {
   WrappedVector4Constraint( Dali::Toolkit::ItemLayout::Vector4Function wrapMe, unsigned int itemId )
   : mWrapMe(wrapMe),
-    mItemId(itemId)
+    mItemId(itemId),
+    mInitial(),
+    mInitialised( false )
   {
   }
 
@@ -90,11 +111,19 @@ struct WrappedVector4Constraint
     float offsetLayoutPosition = inputs[0]->GetFloat() + static_cast<float>(mItemId);
     float weight = inputs[3]->GetFloat();
 
-    Lerp( current, mWrapMe( current, offsetLayoutPosition, inputs[1]->GetFloat(), inputs[2]->GetVector3() ), weight );
+    if( !mInitialised )
+    {
+      mInitialised = true;
+      mInitial = current;
+    }
+
+    Lerp( current, mInitial, mWrapMe( current, offsetLayoutPosition, inputs[1]->GetFloat(), inputs[2]->GetVector3() ), weight );
   }
 
   Dali::Toolkit::ItemLayout::Vector4Function mWrapMe;
   unsigned int mItemId;
+  Dali::Vector4 mInitial;
+  bool mInitialised:1;
 };
 
 struct WrappedBoolConstraint
@@ -130,7 +159,7 @@ namespace Toolkit
 
 ItemLayout::ItemLayout()
 : mOrientation( ControlOrientation::Up ),
-  mAlphaFunction( AlphaFunctions::Linear ),
+  mAlphaFunction( AlphaFunction::LINEAR ),
   mWeightObject()
 {
 }
@@ -291,7 +320,7 @@ void ItemLayout::ApplyConstraints( Actor& actor, const int itemId, const float d
     keyFrames.Add( 1.0f, 1.0f );
 
     Animation applyAnimation = Dali::Animation::New( durationSeconds );
-    applyAnimation.AnimateBetween( Property( mWeightObject, WeightObject::WEIGHT ), keyFrames, mAlphaFunction, durationSeconds );
+    applyAnimation.AnimateBetween( Property( mWeightObject, WeightObject::WEIGHT ), keyFrames, mAlphaFunction, TimePeriod(durationSeconds) );
     applyAnimation.Play();
   }
 }