protected override Size MeasureOverride(Size availableSize)
{
// Remove the border and padding, measure the element, and then add them back, as they must be ignored.
availableSize = availableSize.Remove(BorderThickness).Remove(Padding);
var size = base.MeasureOverride(availableSize) + BorderThickness + Padding;
return size;
}
/// <summary>
/// Measures the element.
/// </summary>
protected virtual Size MeasureCore(Size availableSize)
{
// Remove the margin from the size, as it should be ignored for now.
availableSize = availableSize.Remove(Margin);
// If the width or height is NaN or 0, fall back to the available size, and clamp it within the min and max sizes.
availableSize = Size.Fallback(availableSize).Clamp(MinSize, MaxSize);
// Measure the size of child elements.
var measuredSize = MeasureOverride(availableSize);
measuredSize = Size.Fallback(measuredSize).Clamp(MinSize, MaxSize);
measuredSize = measuredSize.Add(Margin);
return measuredSize;
}
protected override Size ArrangeOverride(Size finalSize)
{
Child?.Arrange(new Rectangle(BorderThickness + Padding, finalSize.Remove(BorderThickness).Remove(Padding)));
return finalSize;
}
/// <summary>
/// Arranges the element.
/// </summary>
protected virtual void ArrangeCore(Rectangle finalRect)
{
// The final size will be equal to the desired size, unless horizontal or vertical alignment is stretch, in which case it will fill the container.
var finalWidth = HorizontalAlignment != HorizontalAlignment.Stretch ? DesiredSize.Width : finalRect.Width;
var finalHeight = VerticalAlignment != VerticalAlignment.Stretch ? DesiredSize.Height : finalRect.Height;
var finalSize = new Size(finalWidth, finalHeight);
finalSize = finalSize.Remove(Margin); // Remove the margin as it needs to be ignored.
// If the elements width or height is 0 or NaN, fall back to the measured size.
finalSize = Size.Fallback(finalSize).Clamp(MinSize, MaxSize);
// Arrange all child elements and return a final size.
var arrangedSize = ArrangeOverride(finalSize);
// Get the offset for the element (due to alignment)
var alignedOffset = Align(finalRect, arrangedSize.Add(Margin));
Position = alignedOffset + Margin;
ActualSize = arrangedSize;
}