Constraints

Constraints declare how a widget sizes and positions itself relative to its parent.

from batFramework.gui.constraints import constraints as c

button = bf.gui.Button("Play")
button.add_constraints(
    c.Width(200),
    c.Height(40),
    c.Center(),
)
scene.root.add(button)

Common constraints

Size: Width, Height, MinWidth, MinHeight, MaxWidth, MaxHeight, Fill, FillX, FillY, percentage variants

Position: Center, CenterX, CenterY, AnchorTop, AnchorBottom, AnchorLeft, AnchorRight, corner anchors, margins

Flex-like: GrowH, GrowV — distribute free space inside layouts

Other: AspectRatio

Constraints resolve during the widget update passes driven by Root.update_tree().