Request: Text h_align = pixie.JUSTIFY_ALIGN

[IagoBeuller]

Would be nice if add this alignment style, also give access to Arrangement attributes(selectionRects, lines, positions).

I've made this little library for making this feature for me, it behaves like the Microsoft Word Office.

import
 nimpy,
 pixie,
 unicode

pyExportModule("pixie_utils")

const
 LF = Rune(10)
 NR = Rune(0)

proc justifyArrangement*(arrangement: Arrangement, maxWidth: float32) {.raises: [].} =
 proc right(rect: Rect): float32 =
 rect.x + rect.w

 let
 runes: ptr = arrangement.runes.addr
 positions: ptr = arrangement.positions.addr
 rects: ptr = arrangement.selectionRects.addr
 last_lineId: int = arrangement.lines.len-1
 var
 rune, last_rune: Rune
 last_wordRuneId: int
 spaces_idx: seq[int]
 inc_width, space_width, line_width, x_offset: float32
 
 for lineId, (start, stop) in arrangement.lines:
 last_rune = runes[stop]

 # This line must not be justified, if it is the last or if the last rune is a breakline char.
 if lineId == last_lineId or last_rune.uint32 == LF.uint32:
 continue

 echo runes[start..stop]
 # Get the spaces indexes of this line to increase their width, and get the line width.
 spaces_idx = @[]
 last_rune = NR
 for r_id in start..stop:
 rune = runes[r_id]
 if not rune.isWhiteSpace():
 if last_rune.isWhiteSpace():
 spaces_idx.add(r_id-1)
 last_wordRuneId = r_id
 last_rune = runes[r_id]

 line_width = rects[last_wordRuneId].right

 echo "Line spaces: ", spaces_idx.len
 if spaces_idx.len > 0:
 # Get the amount of pixels/units to increase each space width in the middle of the line.
 inc_width = (maxWidth - line_width) / spaces_idx.len.float32

 if inc_width > 0:
 space_width = rects[spaces_idx[0]].w + inc_width

 # Adjust the runes X position
 x_offset = 0
 for r_id in spaces_idx[0]..stop:
 positions[r_id].x += x_offset

 if r_id in spaces_idx:
 rects[r_id].x += x_offset
 rects[r_id].w = space_width
 x_offset += inc_width
 else:
 rects[r_id].x += x_offset

proc justifyArrangement(arrangement_ref: int, maxWidth: float32) {.exportpy: "justifyArrangement".} =
 justifyArrangement(cast[Arrangement](arrangement_ref), maxWidth)