internal static Focusable GetPreviousFocusableInTree(VisualElement currentFocusable)
{
if (currentFocusable == null)
{
return(null);
}
VisualElement ve = currentFocusable.GetPreviousElementDepthFirst();
while (!ve.canGrabFocus || ve.tabIndex < 0 || ve.excludeFromFocusRing)
{
ve = ve.GetPreviousElementDepthFirst();
if (ve == null)
{
// continue at the end
ve = currentFocusable.GetRoot();
while (ve.childCount > 0)
{
ve = ve.hierarchy.ElementAt(ve.childCount - 1);
}
}
if (ve == currentFocusable)
{
// We went through the whole tree and did not find anything.
return(currentFocusable);
}
}
return(ve);
}
internal static Focusable GetPreviousFocusableInTree(VisualElement currentFocusable)
{
bool flag = currentFocusable == null;
Focusable result;
if (flag)
{
result = null;
}
else
{
VisualElement visualElement = currentFocusable.GetPreviousElementDepthFirst();
while (!visualElement.canGrabFocus || visualElement.tabIndex < 0 || visualElement.excludeFromFocusRing)
{
visualElement = visualElement.GetPreviousElementDepthFirst();
bool flag2 = visualElement == null;
if (flag2)
{
visualElement = currentFocusable.GetRoot();
while (visualElement.childCount > 0)
{
visualElement = visualElement.hierarchy.ElementAt(visualElement.childCount - 1);
}
}
bool flag3 = visualElement == currentFocusable;
if (flag3)
{
result = currentFocusable;
return(result);
}
}
result = visualElement;
}
return(result);
}
internal static Focusable GetNextFocusableInTree(VisualElement currentFocusable)
{
if (currentFocusable == null)
{
return(null);
}
VisualElement ve = currentFocusable.GetNextElementDepthFirst();
while (!ve.canGrabFocus || ve.tabIndex < 0 || ve.excludeFromFocusRing)
{
ve = ve.GetNextElementDepthFirst();
if (ve == null)
{
// continue at the beginning
ve = currentFocusable.GetRoot();
}
if (ve == currentFocusable)
{
// We went through the whole tree and did not find anything.
return(currentFocusable);
}
}
return(ve);
}
internal static Focusable GetNextFocusableInTree(VisualElement currentFocusable)
{
bool flag = currentFocusable == null;
Focusable result;
if (flag)
{
result = null;
}
else
{
VisualElement nextElementDepthFirst = currentFocusable.GetNextElementDepthFirst();
while (!nextElementDepthFirst.canGrabFocus || nextElementDepthFirst.tabIndex < 0 || nextElementDepthFirst.excludeFromFocusRing)
{
nextElementDepthFirst = nextElementDepthFirst.GetNextElementDepthFirst();
bool flag2 = nextElementDepthFirst == null;
if (flag2)
{
nextElementDepthFirst = currentFocusable.GetRoot();
}
bool flag3 = nextElementDepthFirst == currentFocusable;
if (flag3)
{
result = currentFocusable;
return(result);
}
}
result = nextElementDepthFirst;
}
return(result);
}