void presentDecorAnimations(int position,float offset){
  int animMapSize=mDecorAnimations.size();
  for (int i=0; i < animMapSize; i++) {
    Decor decor=mDecorAnimations.keyAt(i);
    ArrayList<Animation> animations=mDecorAnimations.get(decor);
    int animListSize=animations.size();
    for (int j=0; j < animListSize; j++) {
      Animation animation=animations.get(j);
      if (animation == null) {
        continue;
      }
      if (!animation.shouldAnimate(position)) {
        if (mPreviousPosition < position && animation.pageEnd < position) {
          animation.animate(decor.contentView,1,0,position);
        }
 else         if (mPreviousPosition > position && animation.pageStart > position) {
          animation.animate(decor.contentView,0,0,position);
        }
        continue;
      }
      animation.animate(decor.contentView,offset,0,position);
    }
  }
  mPreviousPosition=position;
}

void presentDecorAnimations ( int position , float offset ) { int animMapSize = mDecorAnimations . size ( ) ; for ( int i = 0 ; i < animMapSize ; i ++ ) { Decor decor = mDecorAnimations . keyAt ( i ) ; ArrayList < Animation > animations = mDecorAnimations . get ( decor ) ; int animListSize = animations . size ( ) ; for ( int j = 0 ; j < animListSize ; j ++ ) { Animation animation = animations . get ( j ) ; if ( animation == null ) { continue ; } if ( ! animation . shouldAnimate ( position ) ) { if ( mPreviousPosition < position && animation . pageEnd < position ) { animation . animate ( decor . contentView , 1 , 0 , position ) ; } else if ( mPreviousPosition > position && animation . pageStart > position ) { animation . animate ( decor . contentView , 0 , 0 , position ) ; } continue ; } animation . animate ( decor . contentView , offset , 0 , position ) ; } } mPreviousPosition = position ; }
run the animations based on the decor animations saved within the presenter and the offset of the scrolling .
