public void OnPageScrollStateChanged(int state)
{
if (state == ViewPager.ScrollStateIdle)
{
ScrollToChild(pager.CurrentItem, 0);
}
//Full alpha for current item
var currentTab = tabsContainer.GetChildAt(pager.CurrentItem);
Selected(currentTab);
//Half transparent for prev item
if (pager.CurrentItem - 1 >= 0)
{
var prevTab = tabsContainer.GetChildAt(pager.CurrentItem - 1);
NotSelected(prevTab);
}
//Half transparent for next item
if (pager.CurrentItem + 1 <= pager.Adapter.Count - 1)
{
View nextTab = tabsContainer.GetChildAt(pager.CurrentItem + 1);
NotSelected(nextTab);
}
if (OnPageChangeListener != null)
{
OnPageChangeListener.OnPageScrollStateChanged(state);
}
}
public void OnPageSelected(int position)
{
UpdateSelection(position);
if (OnPageChangeListener != null)
{
OnPageChangeListener.OnPageSelected(position);
}
}
public void OnPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
currentPosition = position;
currentPositionOffset = positionOffset;
var child = tabsContainer.GetChildAt(position);
if (child == null)
{
return;
}
var offset = tabCount > 0 ? (int)(positionOffset * child.Width) : 0;
ScrollToChild(position, offset);
Invalidate();
if (OnPageChangeListener != null)
{
OnPageChangeListener.OnPageScrolled(position, positionOffset, positionOffsetPixels);
}
}
