private static bool TryGetNotationAndDirection(
MathBox mathBox, Key key, out LogicalDirection direction,
out NotationBase notation
)
{
direction = LogicalDirection.Forward;
InlineUIContainer forwardElement = mathBox.ForwardUiElement;
InlineUIContainer backwardElement = mathBox.BackwardUiElement;
InlineUIContainer inlineUiContainer = null;
if (key == Key.Right && forwardElement != null)
{
inlineUiContainer = forwardElement;
direction = LogicalDirection.Forward;
}
else if (key == Key.Left && backwardElement != null)
{
inlineUiContainer = backwardElement;
direction = LogicalDirection.Backward;
}
if (!(inlineUiContainer?.Child is NotationBase control))
{
notation = null;
return(false);
}
notation = control;
return(true);
}
private static void MathBox_ChildFocusFailed(NotationBase sender, Direction direction)
{
var uiContainer = sender.FindParent <InlineUIContainer>();
var mathBox = uiContainer.FindParent <MathBox>();
LogicalDirection logicalDirection = ConvertDirectionToLogicalDirection(direction);
mathBox.MoveCaretToTextElementBoundary(uiContainer, logicalDirection);
mathBox.Focus();
}
private static void FocusMathElement(NotationBase notation, LogicalDirection direction)
{
if (direction == LogicalDirection.Forward)
{
notation.FocusFirst();
}
else
{
notation.FocusLast();
}
}
private static void FocusSibling(MathBox mathBox, Direction direction)
{
NotationBase parent = mathBox.FindParent <NotationBase>();
parent?.FocusDirection(direction);
}
