/// <summary>
/// re-compute layout
/// </summary>
protected override IEnumerable <Vector2> ComputeLayoutPositions()
{
//the child that only display on the screen
var children = FlowingChildren.ToArray();
if (children.Length == 0)
{
return(new List <Vector2>());
}
Vector2[] result = new Vector2[children.Length];
for (int i = 0; i < children.Length; i++)
{
var drawableLyric = Children.FirstOrDefault(x => x == children[i]);
if (drawableLyric != null)
{
if (drawableLyric.DisplayLayer != 0)
{
var pervous = Children.GetPrevious(drawableLyric);
var next = Children.GetNext(drawableLyric);
var perviousHeight = pervous?.Y + pervous?.DrawHeight ?? 0;
var nextHeight = next?.Y + next?.DrawHeight ?? 0;
result[i].Y = Math.Max(perviousHeight, nextHeight);
}
}
}
return(result);
}
