protected override void OnLayoutCore(bool changed, int left, int top, int right, int bottom)
{
var newSize = new Size(right - left, bottom - top).PhysicalToLogicalPixels();
base.OnLayoutCore(changed, left, top, right, bottom);
if (this.Log().IsEnabled(Microsoft.Extensions.Logging.LogLevel.Debug))
{
this.Log().DebugFormat(
"[{0}/{1}] OnLayoutCore({2}, {3}, {4}, {5}) (parent: {5},{6})",
GetType(),
Name,
left, top, right, bottom,
MeasuredWidth,
MeasuredHeight
);
}
var previousSize = _actualSize;
_actualSize = newSize;
RenderSize = _actualSize;
if (
// If the layout has changed, but the final size has not, this is just a translation.
// So unless there was a layout requested, we can skip arranging the children.
(changed && _lastLayoutSize != newSize)
// Even if nothing changed, but a layout was requested, arrang the children.
|| IsLayoutRequested
)
{
_lastLayoutSize = newSize;
OnBeforeArrange();
_layouter.Arrange(new Rect(0, 0, newSize.Width, newSize.Height));
OnLayoutUpdated();
OnAfterArrange();
}
if (previousSize != newSize)
{
SizeChanged?.Invoke(this, new SizeChangedEventArgs(previousSize, newSize));
RenderTransform?.OnViewSizeChanged(previousSize, newSize);
}
}