Method CalculateConstrainedSize

Xaml/Controls/ConstrainedBox.cpp:81–121

	}

	void ConstrainedBox::CalculateConstrainedSize(wf::Size &availableSize)
	{
		// We check for Infinity, in the case we have no constraint from parent
		// we'll request the child's measurements first, so we can use that as
		// a starting point to constrain it's dimensions based on the criteria
		// set in our properties.
		bool hasWidth = IsPositiveRealNumber(availableSize.Width);
		bool hasHeight = IsPositiveRealNumber(availableSize.Height);

		if (!hasWidth && !hasHeight)
		{
			// We have infinite space, like a ScrollViewer with both scrolling directions
			// Ask child how big they want to be first.
			availableSize = base_type::MeasureOverride(availableSize);

			hasWidth = IsPositiveRealNumber(availableSize.Width);
			hasHeight = IsPositiveRealNumber(availableSize.Height);

			if (!hasWidth && !hasHeight)
			{
				// At this point we have no way to determine a constraint, the Panel won't do anything
				// This should be rare? We don't really have a way to provide a warning here.
				return;
			}
		}

		// Apply Multiples
		// ---------------
		// These floor the Width/Height values to the nearest multiple of the property (if set).
		// For instance you may have a responsive 4x4 repeated checkerboard pattern for transparency and
		// want to snap to the nearest interval of 4 so the checkerboard is consistency across the layout.
		if (hasWidth)
		{
			ApplyMultiple(MultipleX(), availableSize.Width);
		}

		if (hasHeight)
		{
			ApplyMultiple(MultipleY(), availableSize.Height);
		}
	}
}