Box borders reference

TBoxBorderKind enumerates the glyph sets used by Panel and other box-bordered widgets. Each kind has a unicode form and an ASCII fallback; non-unicode terminals automatically use the fallback.

Available kinds

Kind	Unicode preview	ASCII fallback
Square (default)	┌─┬─┐ │ ├─┼─┤ │ └─┴─┘	+-+ | +-+
Rounded	╭─┬─╮ │ ├─┼─┤ │ ╰─┴─╯	+-+ | +-+
Heavy	┏━┳━┓ ┃ ┣━╋━┫ ┃ ┗━┻━┛	+-+ | +-+
Double	╔═╦═╗ ║ ╠═╬═╣ ║ ╚═╩═╝	+-+ | +-+
Ascii	+-+-+ | +-+-+ | +-+-+	same
None	(whitespace)	(whitespace)

Ascii is forced regardless of terminal capability. None produces a border-less panel — useful for nesting where the inner widget has its own visual separation.

Usage

In code:

panel := Widgets.Panel(child).WithBorder(TBoxBorderKind.Rounded);

Get an IBoxBorder instance directly:

border := Widgets.BoxBorder(TBoxBorderKind.Heavy);

Glyph parts

The TBoxBorderPart enum names the individual glyph slots:

TopLeft    Top    TopRight
Left              Right
BottomLeft Bottom BottomRight
HeaderLeft        HeaderRight

HeaderLeft and HeaderRight sit immediately to the left and right of an inline panel header. By default they're equal to Left / Right, so the header text reads inline with the top border.

Getting a glyph:

ch := border.GetPart(TBoxBorderPart.TopLeft, options.Unicode);

When unicode = False, the ASCII fallback is returned regardless of the kind.

Custom borders

Implement IBoxBorder directly if you need a custom glyph set. Your impl returns a Char for every TBoxBorderPart value plus your Kind value.

See also

• Panel — primary consumer.
• Table borders — separate enum for table glyphs.
• Tree guides — separate enum for tree branch glyphs.