layout/termfair.lua

   1
   2 --[[
   3
   4      Licensed under GNU General Public License v2
   5       * (c) 2013,      Luke Bonham
   6       * (c) 2010-2012, Peter Hofmann
   7
   8 --]]
   9
  10 local tag       = require("awful.tag")
  11 local beautiful = require("beautiful")
  12 local math      = { ceil  = math.ceil,
  13                     floor = math.floor,
  14                     max   = math.max }
  15 local tonumber  = tonumber
  16
  17 local termfair  = { name = "termfair" }
  18
  19 function termfair.arrange(p)
  20     -- Layout with fixed number of vertical columns (read from nmaster).
  21     -- New windows align from left to right. When a row is full, a now
  22     -- one above it is created. Like this:
  23
  24     --        (1)                (2)                (3)
  25     --   +---+---+---+      +---+---+---+      +---+---+---+
  26     --   |   |   |   |      |   |   |   |      |   |   |   |
  27     --   | 1 |   |   |  ->  | 2 | 1 |   |  ->  | 3 | 2 | 1 |  ->
  28     --   |   |   |   |      |   |   |   |      |   |   |   |
  29     --   +---+---+---+      +---+---+---+      +---+---+---+
  30
  31     --        (4)                (5)                (6)
  32     --   +---+---+---+      +---+---+---+      +---+---+---+
  33     --   | 4 |   |   |      | 5 | 4 |   |      | 6 | 5 | 4 |
  34     --   +---+---+---+  ->  +---+---+---+  ->  +---+---+---+
  35     --   | 3 | 2 | 1 |      | 3 | 2 | 1 |      | 3 | 2 | 1 |
  36     --   +---+---+---+      +---+---+---+      +---+---+---+
  37
  38     -- A useless gap (like the dwm patch) can be defined with
  39     -- beautiful.useless_gap_width.
  40     local useless_gap = tonumber(beautiful.useless_gap_width) or 0
  41
  42     -- Screen.
  43     local wa = p.workarea
  44     local cls = p.clients
  45
  46     -- How many vertical columns?
  47     local t = tag.selected(p.screen)
  48     local num_x = termfair.nmaster or tag.getnmaster(t)
  49
  50     -- Do at least "desired_y" rows.
  51     local desired_y = termfair.ncol or tag.getncol(t)
  52
  53     if #cls > 0
  54     then
  55         local num_y = math.max(math.ceil(#cls / num_x), desired_y)
  56         local cur_num_x = num_x
  57         local at_x = 0
  58         local at_y = 0
  59         local remaining_clients = #cls
  60         local width = math.floor(wa.width / num_x)
  61         local height = math.floor(wa.height / num_y)
  62
  63         -- We start the first row. Left-align by limiting the number of
  64         -- available slots.
  65         if remaining_clients < num_x
  66         then
  67             cur_num_x = remaining_clients
  68         end
  69
  70         -- Iterate in reversed order.
  71         for i = #cls,1,-1
  72         do
  73             -- Get x and y position.
  74             local c = cls[i]
  75             local this_x = cur_num_x - at_x - 1
  76             local this_y = num_y - at_y - 1
  77
  78             -- Calc geometry.
  79             local g = {}
  80             if this_x == (num_x - 1)
  81             then
  82                 g.width = wa.width - (num_x - 1) * width
  83             else
  84                 g.width = width
  85             end
  86             if this_y == (num_y - 1)
  87             then
  88                 g.height = wa.height - (num_y - 1) * height
  89             else
  90                 g.height = height
  91             end
  92             g.x = wa.x + this_x * width
  93             g.y = wa.y + this_y * height
  94             if useless_gap > 0
  95             then
  96                 -- Top and left clients are shrinked by two steps and
  97                 -- get moved away from the border. Other clients just
  98                 -- get shrinked in one direction.
  99                 if this_x == 0
 100                 then
 101                     g.width = g.width - 2 * useless_gap
 102                     g.x = g.x + useless_gap
 103                 else
 104                     g.width = g.width - useless_gap
 105                 end
 106
 107                 if this_y == 0
 108                 then
 109                     g.height = g.height - 2 * useless_gap
 110                     g.y = g.y + useless_gap
 111                 else
 112                     g.height = g.height - useless_gap
 113                 end
 114             end
 115             c:geometry(g)
 116             remaining_clients = remaining_clients - 1
 117
 118             -- Next grid position.
 119             at_x = at_x + 1
 120             if at_x == num_x
 121             then
 122                 -- Row full, create a new one above it.
 123                 at_x = 0
 124                 at_y = at_y + 1
 125
 126                 -- We start a new row. Left-align.
 127                 if remaining_clients < num_x
 128                 then
 129                     cur_num_x = remaining_clients
 130                 end
 131             end
 132         end
 133     end
 134 end
 135
 136 return termfair