using System.Windows;

using CSharpCodeAnalyst.Contracts;

using CSharpCodeAnalyst.TreeMap.TreeMap;

namespace CSharpCodeAnalyst.TreeMap.Common

{

internal sealed class HitTest

{

/// <summary>

/// The layout must have been calculated - pass the map the renderer produced.

/// </summary>

public IHierarchicalData? Hit(IHierarchicalData item, Point mousePos, TreeMapLayout layout)

{

var rect = layout.Get(item);

if (rect == null)

{

return null;

}

// We may find a more detailed hit deeper.

IHierarchicalData? best = null;

if (rect.IsHit(mousePos))

{

best = item;

if (item.IsLeafNode)

{

return item;

}

}

foreach (var child in item.Children)

{

if (layout.Get(child)?.IsHit(mousePos) == true)

{

return Hit(child, mousePos, layout);

}

}

return best;

}

}

}