MesenCE/UI/ThirdParty/DataBox/Primitives/Layout/DataBoxRowsLayout.cs

using Avalonia;
using Avalonia.Collections;
using Avalonia.Controls;
using System;

namespace DataBoxControl.Primitives.Layout;

internal static class DataBoxRowsLayout
{
	private static double SetColumnsActualWidth(DataBox dataBox)
	{
		var accumulatedWidth = 0.0;
		var actualWidths = new double[dataBox.Columns.Count];

		for(var c = 0; c < dataBox.Columns.Count; c++) {
			var column = dataBox.Columns[c];
			int actualWidth = dataBox.ColumnWidths[c];

			actualWidth = Math.Max(column.MinWidth, actualWidth);
			actualWidth = Math.Min(column.MaxWidth, actualWidth);

			actualWidths[c] = actualWidth;
			accumulatedWidth += actualWidths[c];

			column.MeasureWidth = actualWidths[c];

		}

		return accumulatedWidth;
	}

	private static double AdjustAccumulatedWidth(double accumulatedWidth, double availableWidth)
	{
		if(double.IsPositiveInfinity(availableWidth)) {
			return accumulatedWidth;
		}
		return accumulatedWidth < availableWidth ? availableWidth : accumulatedWidth;
	}

	public static Size Measure(Size availableSize, DataBox dataBox, Func<Size, Size> measureOverride, AvaloniaList<Control> rows)
	{
		var availableSizeWidth = availableSize.Width;

		dataBox.AvailableWidth = availableSize.Width;
		dataBox.AvailableHeight = availableSize.Height;

		var accumulatedWidth = SetColumnsActualWidth(dataBox);
		var panelSize = availableSize.WithWidth(accumulatedWidth);

		panelSize = measureOverride(panelSize);
		panelSize = panelSize.WithWidth(AdjustAccumulatedWidth(accumulatedWidth, availableSizeWidth));

		return panelSize;
	}

	public static Size Arrange(Size finalSize, DataBox dataBox, Func<Size, Size> arrangeOverride, AvaloniaList<Control> rows)
	{
		var finalSizeWidth = finalSize.Width;

		dataBox.AvailableWidth = finalSize.Width;
		dataBox.AvailableHeight = finalSize.Height;
		dataBox.AccumulatedWidth = SetColumnsActualWidth(dataBox);
		var panelSize = finalSize.WithWidth(dataBox.AccumulatedWidth);

		panelSize = arrangeOverride(panelSize);
		panelSize = panelSize.WithWidth(AdjustAccumulatedWidth(dataBox.AccumulatedWidth, finalSizeWidth));

		return panelSize;
	}
}