public int Compare(Stop x, Stop y)
{
Point relativePosition1 = KeyboardNavigationTarget.GetLeftBoundPosition(KeyboardNavigationTarget.GetAbsoluteBounds(x.Element)) - currentPosition;
Point relativePosition2 = KeyboardNavigationTarget.GetLeftBoundPosition(KeyboardNavigationTarget.GetAbsoluteBounds(y.Element)) - currentPosition;
double distance1 = relativePosition1.X < 0 ? -relativePosition1.GetLengthSqr() : relativePosition1.GetLengthSqr();
double distance2 = relativePosition2.X < 0 ? -relativePosition2.GetLengthSqr() : relativePosition2.GetLengthSqr();
return(distance1.CompareTo(distance2));
}
public override IEnumerable <Stop> GetGlobalStops(Visual scope, Visual currentElement, DependencyProperty navigationModeProperty)
{
int scopeTabIndex = KeyboardNavigation.GetTabIndex(scope);
if (IsStop((UIElement)scope) || scope == currentElement)
{
yield return(new Stop(scope, scopeTabIndex));
}
// translate stops to have scope tab index instead of local tab index, local order is kept
foreach (Stop stop in scope.VisualChildren.SelectMany(child => KeyboardNavigationTarget.GetGlobalStops(child, currentElement, navigationModeProperty)).OrderBy(childStop => childStop.TabIndex))
{
yield return(new Stop(stop.Element, scopeTabIndex));
}
}
public override IEnumerable <Stop> GetGlobalStops(Visual scope, Visual currentElement, DependencyProperty navigationModeProperty)
{
if (IsStop((UIElement)scope) || scope == currentElement)
{
yield return(new Stop(scope));
}
VisualWeakReference navigationFocusElementReference = KeyboardNavigation.GetNavigationFocusElement(scope);
Visual navigationFocusElement = navigationFocusElementReference != null ? navigationFocusElementReference.Visual : null;
Stop[] stops = scope.VisualChildren.SelectMany(child => KeyboardNavigationTarget.GetGlobalStops(child, currentElement, navigationModeProperty)).ToArray();
if (stops.Any())
{
stops = stops.Where(stop => stop.Element == currentElement || stop.Element == navigationFocusElement).DefaultIfEmpty(stops.First()).ToArray();
foreach (Stop stop in stops)
{
yield return(stop);
}
}
}
private void OnPostProcessKey(object sender, KeyEventArgs e)
{
if (e.Handled)
{
return;
}
FocusNavigationDirection navigationDirection;
DependencyProperty navigationModeProperty;
if (TryGetNavigationMode(e, out navigationModeProperty, out navigationDirection))
{
UIElement currentTarget = (UIElement)presentationSource.KeyboardDevice.Target ?? presentationSource.RootElement;
UIElement newTarget = (UIElement)KeyboardNavigationTarget.FindTarget(currentTarget, navigationDirection, navigationModeProperty);
if (currentTarget != newTarget && newTarget != null)
{
newTarget.Focus();
}
e.Handled = true;
}
}
public RightBoundStopComparer(Stop currentStop)
{
currentPosition = KeyboardNavigationTarget.GetRightBoundPosition(KeyboardNavigationTarget.GetAbsoluteBounds(currentStop.Element));
}
public override Visual FindPreviousTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(KeyboardNavigationTarget.FindPreviousContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider) ??
(scope.VisualParent != null ? KeyboardNavigationTarget.FindPreviousTarget(scope.VisualParent, new Stop(currentStop.Element, KeyboardNavigation.GetTabIndex(scope)), navigationModeProperty, stopComparerProvider) : null)); // translate currentStop and forward request to parent
}
public override Visual FindLastTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(KeyboardNavigationTarget.FindLastContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider));
}
public override Visual FindPreviousTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(KeyboardNavigationTarget.FindPreviousContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider) ?? currentStop.Element); // stay at the edge
}
public override IEnumerable <Stop> GetGlobalStops(Visual scope, Visual currentElement, DependencyProperty navigationModeProperty)
{
if (IsStop((UIElement)scope) || scope == currentElement)
{
yield return(new Stop(scope));
}
// add currentElement stop if it's a descendant of scope
if (scope.IsAncestorOf(currentElement))
{
IEnumerable <Stop> childrenStop = scope.VisualChildren.SelectMany(child => KeyboardNavigationTarget.GetGlobalStops(child, currentElement, navigationModeProperty));
yield return(childrenStop.First(childStop => childStop.Element == currentElement));
}
}
public override Visual FindPreviousTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
// forward the request to the parent
return(scope.VisualParent != null?KeyboardNavigationTarget.FindPreviousTarget(scope.VisualParent, currentStop, navigationModeProperty, stopComparerProvider) : null);
}
public virtual IEnumerable <Stop> GetGlobalStops(Visual scope, Visual currentElement, DependencyProperty navigationModeProperty)
{
return(KeyboardNavigationTarget.GetContainedStops(scope, currentElement, navigationModeProperty));
}
public virtual Visual FindLastTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(scope.VisualParent != null?
KeyboardNavigationTarget.FindLastTarget(scope.VisualParent, currentStop, navigationModeProperty, stopComparerProvider) :
KeyboardNavigationTarget.FindLastContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider));
}
