Configuration transformations

Configuration transformations are implemented as a kind of layout helper. In this document are the particulars of each layout configuration offered, and the effects of the operation performed.

l = left, t = top, r = right, b = bottom, w = width, h = height

LTR (a no-op transformation)

ltr(l, t, r, b) = (l, t, r, b)

RTL

Mirrors the horizontal values within the finite space.
rtl(l, t, r, b) = (w - r, t, w - l, b)

Stack from end

Mirrors the vertical values.
sfe(l, t, r, b) = (l, h - b, r, h - t)

Reverse

Mirrors both the horizontal and vertical values.
rev(l, t, r, b) = (w - r, h - b, w - l, h - t)

Vertical orientation

A no-op transformation.
ver(l, t, r, b) = (l, t, r, b)

Horizontal orientation

Swaps the top and left values, and the bottom and right values. Effectively mirroring along a line drawn from the NW corner to the SE corner.
hor(l, t, r, b) = (t, l, b, r) It is important to note that for horizontal scrolling configurations, width and height measurement calls are transposed. w = h and h = w