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DarkTreeView rendering optimization. #52

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DarkTreeView rendering optimization. #52

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25 changes: 24 additions & 1 deletion DarkUI/Controls/DarkTreeView.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1262,10 +1262,33 @@ private void DrawNode(DarkTreeNode node, Graphics g)
}

// 5. Draw child nodes
DrawChildNodes(node, g);

}

/// <summary>
/// Recursively paints only the nodes and child nodes within the viewport.
/// </summary>
private void DrawChildNodes(DarkTreeNode node, Graphics g)
{
if (node.Expanded)
{
foreach (var childNode in node.Nodes)
DrawNode(childNode, g);
{

if (childNode.Expanded)
DrawChildNodes(childNode, g);

bool isInTopView = Viewport.Top <= childNode.FullArea.Y;
bool isWithin = childNode.FullArea.Y < Viewport.Top + Viewport.Height;
bool isPastBottomView = childNode.FullArea.Y > Viewport.Top + Viewport.Height;

if (isInTopView && isWithin)
DrawNode(childNode, g);

if (isPastBottomView)
break;
}
}
}

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