Test script of my new dynamic ruler lane height logic for SWS https://i.imgur.com/sR44czh.png

lane_sizes.csv

reaper_ruler_test.lua

function GetRulerLanesHeight()
  local rowMaxHeight = 16
  local lanes = {1, 1, 1, 3}
  local limits = {255, 255, 3, 3}

  for i=0,2 do
    if reaper.GetToggleCommandState(42323 + i) == 0 then
      limits[i + 1] = lanes[i + 1]
    end
  end

  local minRowCount = sum(lanes)
  local rowHeight = math.min(math.ceil(rulerHeight / minRowCount), rowMaxHeight)
  
  local availableRows = math.ceil(rulerHeight / rowHeight) - minRowCount
  availableRows = math.min(availableRows, sum(limits) - minRowCount)
  
  local lane = 0
  while availableRows > 0 do
    if limits[lane + 1] > lanes[lane + 1] then
      lanes[lane + 1] = lanes[lane + 1] + 1
      availableRows = availableRows - 1
    end
    
    lane = (lane + 1) % 4
  end
  
  -- convert rows into pixels
  for i=1,4 do
   lanes[i] = lanes[i] * rowHeight
  end

  return lanes
end

function sum(t)
  local s = 0

  for _,v in ipairs(t) do
    s = s + v
  end

  return s
end

function drawLane(name, color, height)
  gfx.r, gfx.g, gfx.b = color, color, color
  gfx.rect(0, gfx.y, gfx.w, height)
  gfx.r, gfx.g, gfx.b = 1, 1, 1

  gfx.x = 0
  gfx.drawstr(name)

  gfx.y = gfx.y + height
end

function loop()
  if gfx.getchar() < 0 then
    return
  else
    reaper.defer(loop)
  end
  
  if gfx.mouse_cap & 1 == 1 then
    rulerHeight = math.max(70, math.min(gfx.h, gfx.mouse_y))
  end
  
  lanes = GetRulerLanesHeight()
  
  gfx.y = 0
  drawLane("Regions", 0.2, lanes[1])
  drawLane("Markers", 0.4, lanes[2])
  drawLane("Tempo", 0.2, lanes[3])
  drawLane("Timeline", 0.4, lanes[4])
  
  gfx.r, gfx.g, gfx.b = 1, 0, 0
  gfx.line(0, rulerHeight, gfx.w, rulerHeight)
  
  gfx.update()
end

rulerHeight = 70
gfx.init("REAPER 5.65 dynamic ruler height test", 300, 300, 0, 1000, 14)
gfx.setcursor(32645)
loop()