/// <summary>Gets the nearest focusable element below this.</summary>
/// <returns>The nearest focusable element below. Null if there is none.</returns>
public HtmlElement GetFocusableBelow()
{
// Has the element defined something specific?
HtmlElement target = GetFocusableOverride("down");
if (target != null)
{
// Yep, it did!
return(target);
}
// Distance of the nearest element (set when nearest is first set):
float nearestDistance = 0f;
// The current nearest element:
HtmlElement nearest = null;
// Grab my computed style:
ComputedStyle computed = Style.Computed;
// Get hold of the iterator (so we can safely skip child elements):
NodeIterator allElements = document.allNodes;
// Grab my x position:
float myX = computed.GetMidpointX();
// Grab the midpoint of this element on Y:
float myY = computed.GetMidpointY();
// For each element in the dom that is focusable and below this..
foreach (Node node in allElements)
{
HtmlElement element = node as HtmlElement;
if (element == null)
{
continue;
}
if (element != this && element.IsBelow(myY) && element.focusable)
{
// We have an element below.
// Check if it is closer than the current result.
// If it is, it's the current result.
// Is it nearer?
float distance = element.DistanceFromFast(myX, myY);
// Is it the first we've found, or is it nearer?
if (nearest == null || distance < nearestDistance)
{
nearest = element;
nearestDistance = distance;
}
// Make sure we don't now iterate its kids:
allElements.SkipChildren = true;
}
}
return(nearest);
}
