static RenderElement HitTestOnPreviousChain(HitChain hitPointChain, HitChain previousChain, int x, int y)
{
#if DEBUG
if (hitPointChain == previousChain)
{
throw new NotSupportedException();
}
#endif
if (previousChain.Count > 0)
{
previousChain.SetStartTestPoint(x, y);
//test on prev chain top to bottom
int j = previousChain.Count;
for (int i = 0; i < j; ++i)
{
HitInfo hitInfo = previousChain.GetHitInfo(i);
RenderElement elem = hitInfo.hitElement;
if (elem != null && elem.VisibleAndHasParent)
{
if (elem.Contains(hitInfo.point))
{
RenderElement found = elem.FindUnderlyingSiblingAtPoint(hitInfo.point);
if (found == null)
{
Point leftTop = elem.Location;
hitPointChain.OffsetTestPoint(leftTop.X, leftTop.Y);
hitPointChain.AddHitObject(elem);
//add to chain
}
else
{
break;
}
}
}
else
{
break;
}
}
}
//---------------------------------
if (hitPointChain.Count > 0)
{
var commonElement = hitPointChain.GetHitInfo(hitPointChain.Count - 1).hitElement;
hitPointChain.RemoveCurrentHit();
return commonElement;
}
else
{
return null;
}
}
//==============================================================
//hit test
public bool HitTestCore(HitChain hitChain)
{
if ((propFlags & RenderElementConst.HIDDEN) != 0)
{
return false;
}
int testX;
int testY;
hitChain.GetTestPoint(out testX, out testY);
if ((testY >= b_top && testY <= (b_top + b_height)
&& (testX >= b_left && testX <= (b_left + b_width))))
{
if (this.MayHasViewport)
{
hitChain.OffsetTestPoint(
-b_left + this.ViewportX,
-b_top + this.ViewportY);
}
else
{
hitChain.OffsetTestPoint(-b_left, -b_top);
}
hitChain.AddHitObject(this);
if (this.MayHasChild)
{
this.ChildrenHitTestCore(hitChain);
}
if (this.MayHasViewport)
{
hitChain.OffsetTestPoint(
b_left - this.ViewportX,
b_top - this.ViewportY);
}
else
{
hitChain.OffsetTestPoint(b_left, b_top);
}
if ((propFlags & RenderElementConst.TRANSPARENT_FOR_ALL_EVENTS) != 0 &&
hitChain.TopMostElement == this)
{
hitChain.RemoveCurrentHit();
return false;
}
else
{
return true;
}
}
else
{
return false;
}
}