/// <summary>
/// Gets the next item that should be focused in the specified container.
/// </summary>
/// <param name="element">The starting element/</param>
/// <param name="container">The container.</param>
/// <param name="direction">The direction.</param>
/// <param name="outsideElement">
/// If true will not descend into <paramref name="element"/> to find next control.
/// </param>
/// <returns>The next element, or null if the element is the last.</returns>
private static IInputElement GetNextInContainer(
IInputElement element,
IInputElement container,
NavigationDirection direction,
bool outsideElement)
{
if (direction == NavigationDirection.Next && !outsideElement)
{
var descendant = GetFocusableDescendants(element, direction).FirstOrDefault();
if (descendant != null)
{
return(descendant);
}
}
if (container != null)
{
var navigable = container as INavigableContainer;
// TODO: Do a spatial search here if the container doesn't implement
// INavigableContainer.
if (navigable != null)
{
while (element != null)
{
element = navigable.GetControl(direction, element, false);
if (element != null &&
element.CanFocus() &&
KeyboardNavigation.GetIsTabStop((InputElement)element))
{
break;
}
}
}
else
{
// TODO: Do a spatial search here if the container doesn't implement
// INavigableContainer.
element = null;
}
if (element != null && direction == NavigationDirection.Previous)
{
var descendant = GetFocusableDescendants(element, direction).LastOrDefault();
if (descendant != null)
{
return(descendant);
}
}
return(element);
}
return(null);
}
/// <summary>
/// Gets the next item that should be focused in the specified container.
/// </summary>
/// <param name="element">The starting element/</param>
/// <param name="container">The container.</param>
/// <param name="direction">The direction.</param>
/// <returns>The next element, or null if the element is the last.</returns>
private static IInputElement GetNextInContainer(
IInputElement element,
IInputElement container,
FocusNavigationDirection direction)
{
if (direction == FocusNavigationDirection.Down)
{
var descendent = GetFocusableDescendents(element).FirstOrDefault();
if (descendent != null)
{
return(descendent);
}
}
if (container != null)
{
var navigable = container as INavigableContainer;
if (navigable != null)
{
while (element != null)
{
element = navigable.GetControl(direction, element);
if (element != null && element.CanFocus())
{
break;
}
}
}
else
{
// TODO: Do a spatial search here if the container doesn't implement
// INavigableContainer.
element = null;
}
if (element != null && direction == FocusNavigationDirection.Up)
{
var descendent = GetFocusableDescendents(element).LastOrDefault();
if (descendent != null)
{
return(descendent);
}
}
return(element);
}
return(null);
}
/// <summary>
/// Gets the next item that should be focused in the specified container.
/// </summary>
/// <param name="element">The starting element/</param>
/// <param name="container">The container.</param>
/// <param name="direction">The direction.</param>
/// <returns>The next element, or null if the element is the last.</returns>
private static IInputElement GetNextInContainer(
IInputElement element,
IInputElement container,
FocusNavigationDirection direction)
{
if (direction == FocusNavigationDirection.Down)
{
var descendent = GetFocusableDescendents(element).FirstOrDefault();
if (descendent != null)
{
return descendent;
}
}
if (container != null)
{
var navigable = container as INavigableContainer;
if (navigable != null)
{
while (element != null)
{
element = navigable.GetControl(direction, element);
if (element != null && element.CanFocus())
{
break;
}
}
}
else
{
// TODO: Do a spatial search here if the container doesn't implement
// INavigableContainer.
element = null;
}
if (element != null && direction == FocusNavigationDirection.Up)
{
var descendent = GetFocusableDescendents(element).LastOrDefault();
if (descendent != null)
{
return descendent;
}
}
return element;
}
return null;
}