protected bool CanScroll(View view, bool checkV, int dx, int x, int y)
{
var viewGroup = view as ViewGroup;
if (viewGroup == null)
{
return(checkV && ViewCompat.CanScrollHorizontally(view, -dx));
}
var scrollX = viewGroup.ScrollX;
var scrollY = viewGroup.ScrollY;
var count = viewGroup.ChildCount;
for (var i = count - 1; i >= 0; i--)
{
var child = viewGroup.GetChildAt(i);
if (x + scrollX >= child.Left && x + scrollX < child.Right &&
y + scrollY >= child.Top && y + scrollY < child.Bottom &&
CanScroll(child, true, dx, x + scrollX - child.Left, y + scrollY - child.Top))
{
return(true);
}
}
return(checkV && ViewCompat.CanScrollHorizontally(view, -dx));
}
/// <summary>
/// Tests scrollability within child views of v given a delta of dx.
/// </summary>
/// <param name="v"> View to test for horizontal scrollability </param>
/// <param name="checkV"> Whether the view v passed should itself be checked for scrollability (true),
/// or just its children (false). </param>
/// <param name="dx"> Delta scrolled in pixels </param>
/// <param name="x"> X coordinate of the active touch point </param>
/// <param name="y"> Y coordinate of the active touch point </param>
/// <returns> true if child views of v can be scrolled by delta of dx. </returns>
protected bool CanScroll(View v, bool checkV, int dx, int x, int y)
{
if (v is ViewGroup)
{
ViewGroup group = (ViewGroup)v;
int scrollX = v.ScrollX;
int scrollY = v.ScrollY;
int count = group.ChildCount;
// Count backwards - let topmost views consume scroll distance first.
for (int i = count - 1; i >= 0; i--)
{
View child = group.GetChildAt(i);
if (x + scrollX >= child.Left && x + scrollX < child.Right && y + scrollY >= child.Top && y + scrollY < child.Bottom && CanScroll(child, true, dx, x + scrollX - child.Left, y + scrollY - child.Top))
{
return(true);
}
}
}
return(checkV && ViewCompat.CanScrollHorizontally(v, -dx));
}