public void Update(ref Vector3 availableSize)
{
Vector3 parentPosition;
Vector3 parentSize;
Matrix parentMatrixInv;
var parent = gameSideElement.VisualParent;
if (parent is not null)
{
// parentCanvas is sized to the parent of the associated UIElement
var parentMatrix = parent.WorldMatrix;
parentPosition = parentMatrix.TranslationVector + availableSize * 0.5f;
parentSize = parent.RenderSize;
parentMatrixInv = Matrix.Invert(parent.WorldMatrix);
}
else
{
// Or to the total available size if it doesn't have a parent.
parentPosition = availableSize * 0.5f;
parentSize = availableSize;
parentMatrixInv = Matrix.Identity;
}
parentCanvas.Size = parentSize;
parentCanvas.SetCanvasAbsolutePosition(parentPosition);
parentCanvas.SetCanvasPinOrigin(0.5f * Vector3.One); // Centered on origin
var diffMatrix = Matrix.Multiply(parentMatrixInv, gameSideElement.WorldMatrix);
var position = diffMatrix.TranslationVector + parentSize * 0.5f;
// canvas is sized to the associated UIElement
canvas.Size = gameSideElement.RenderSize;
// canvas is Z-offset by depth bias (+1 to differentiate with the adorner root canvas)
canvas.Margin = new Thickness(0, 0, 0, 0, 0, -1 * (gameSideElement.DepthBias + 1)); // Because we are inside a canvas, only Left, Top and Front margins can be used.
canvas.SetCanvasAbsolutePosition(position);
canvas.SetCanvasPinOrigin(0.5f * Vector3.One); // Centered on origin
adorners.ForEach(a => a.Update(position));
highlightAdorner?.Update(position);
}
