private void OnItemScrolled(RecyclerView recyclerView, int dx, int dy)
{
float ratio = ComputeRatio(recyclerView);
float footerRatio = Math.Max(0, Math.Min(FOOTER_RATIO_START, ratio) - FOOTER_RATIO_DIFF) / FOOTER_RATIO_MAX;
float avatarRatio = Math.Max(0, Math.Min(AVATAR_RATIO_START, ratio) - AVATAR_RATIO_DIFF) / AVATAR_RATIO_MAX;
float answerRatio = Math.Max(0, Math.Min(ANSWER_RATIO_START, ratio) - ANSWER_RATIO_DIFF) / ANSWER_RATIO_MAX;
float middleRatio = Math.Max(0, Math.Min(MIDDLE_RATIO_START, ratio) - MIDDLE_RATIO_DIFF) / MIDDLE_RATIO_MAX;
ViewCompat.SetPivotY(mFooter, 0);
ViewCompat.SetScaleY(mFooter, footerRatio);
ViewCompat.SetAlpha(mFooter, footerRatio);
ViewCompat.SetPivotY(mMiddleAnswer, mMiddleAnswer.Height);
ViewCompat.SetScaleY(mMiddleAnswer, 1f - answerRatio);
ViewCompat.SetAlpha(mMiddleAnswer, 0.5f - answerRatio);
ViewCompat.SetAlpha(mHeaderCaption1, answerRatio);
ViewCompat.SetAlpha(mHeaderCaption2, 1f - answerRatio);
View mc2 = mMiddleCollapsible[1];
ViewCompat.SetPivotX(mc2, 0);
ViewCompat.SetPivotY(mc2, mc2.Height / 2);
foreach (View view in mMiddleCollapsible)
{
ViewCompat.SetScaleX(view, avatarRatio);
ViewCompat.SetScaleY(view, avatarRatio);
ViewCompat.SetAlpha(view, avatarRatio);
}
ViewGroup.LayoutParams lp = mMiddle.LayoutParameters;
lp.Height = m120dp - (int)(m10dp * (1f - middleRatio));
mMiddle.LayoutParameters = lp;
}