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RobinPerris / DarkUI

Dark themed control and docking library for .NET WinForms.
MIT License
834 stars 185 forks source link

DarkTreeView rendering optimization. #52

Open Quobi opened 3 years ago

Quobi commented 3 years ago

Optimized the drawing of child nodes. It'll perform similar to listview, drawing only the visible elements within the viewport, thus making the scrolling smooth. With support for each child nodes.

Quobi commented 3 years ago

Might want to change:

 bool isInTopView = Viewport.Top <= childNode.FullArea.Y;

To:

 bool isInTopView = Viewport.Top <= childNode.FullArea.Y + ItemHeight;

As the first visible node it's not drawn sometimes.