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

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

namespace DataBoxControl.Primitives.Layout;

internal static class DataBoxCellsLayout
{
	public static Size Measure(Size availableSize, DataBox? dataBox, AvaloniaList<Control> children)
	{
		if(dataBox is null || children.Count == 0) {
			return availableSize;
		}

		var parentWidth = 0.0;
		var parentHeight = 0.0;

		for(var i = 0; i < children.Count; ++i) {
			if(i >= dataBox.Columns.Count) {
				break;
			}

			var child = children[i];
			var column = dataBox.Columns[i];
			var width = Math.Max(0.0, double.IsNaN(column.MeasureWidth) ? 0.0 : column.MeasureWidth);

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

			child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));

			parentWidth += width;
			parentHeight = Math.Max(parentHeight, child.DesiredSize.Height);
		}

		return new Size(parentWidth, parentHeight);
	}

	public static Size Arrange(Size arrangeSize, DataBox? dataBox, AvaloniaList<Control> children)
	{
		if(dataBox is null || children.Count == 0) {
			return arrangeSize;
		}

		var accumulatedWidth = 0.0;
		var accumulatedHeight = 0.0;
		var maxHeight = 0.0;

		for(var i = 0; i < children.Count; ++i) {
			var child = children[i];

			maxHeight = Math.Max(maxHeight, child.DesiredSize.Height);
		}

		for(var i = 0; i < children.Count; ++i) {
			if(i >= dataBox.Columns.Count) {
				break;
			}

			var child = children[i];
			var column = dataBox.Columns[i];
			var width = Math.Max(0.0, double.IsNaN(column.MeasureWidth) ? 0.0 : column.MeasureWidth);
			var height = Math.Max(maxHeight, arrangeSize.Height);
			var rect = new Rect(accumulatedWidth, 0.0, width, height);

			child.Arrange(rect);

			accumulatedWidth += width;
			accumulatedHeight = Math.Max(accumulatedHeight, height);
		}

		return new Size(accumulatedWidth, accumulatedHeight);
	}
}