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readme updated
[etc/awesome.git] / layout / uselessfair.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2013,      Luke Bonham                
6       * (c) 2012,      Josh Komoroske             
7       * (c) 2010-2012, Peter Hofmann              
8                                                   
9 --]]
10
11 local beautiful = require("beautiful")
12 local ipairs    = ipairs
13 local math      = { ceil = math.ceil, sqrt = math.sqrt }
14 local tonumber  = tonumber
15
16 local uselessfair = {}
17
18 local function fair(p, orientation)
19     -- A useless gap (like the dwm patch) can be defined with
20     -- beautiful.useless_gap_width.
21     local useless_gap = tonumber(beautiful.useless_gap_width)
22     if useless_gap == nil
23     then
24         useless_gap = 0
25     end
26
27     local wa = p.workarea
28     local cls = p.clients
29
30     if #cls > 0 then
31         local cells = math.ceil(math.sqrt(#cls))
32         local strips = math.ceil(#cls / cells)
33
34         local cell = 0
35         local strip = 0
36         for k, c in ipairs(cls) do
37             local g = {}
38             -- Save actual grid index for use in the useless_gap
39             -- routine.
40             local this_x = 0
41             local this_y = 0
42             if ( orientation == "east" and #cls > 2 )
43             or ( orientation == "south" and #cls <= 2 ) then
44                 if #cls < (strips * cells) and strip == strips - 1 then
45                     g.width = wa.width / (cells - ((strips * cells) - #cls))
46                 else
47                     g.width = wa.width / cells
48                 end
49                 g.height = wa.height / strips
50
51                 this_x = cell
52                 this_y = strip
53
54                 g.x = wa.x + cell * g.width
55                 g.y = wa.y + strip * g.height
56
57             else
58                 if #cls < (strips * cells) and strip == strips - 1 then
59                     g.height = wa.height / (cells - ((strips * cells) - #cls))
60                 else
61                     g.height = wa.height / cells
62                 end
63                 g.width = wa.width / strips
64
65                 this_x = strip
66                 this_y = cell
67
68                 g.x = wa.x + strip * g.width
69                 g.y = wa.y + cell * g.height
70             end
71
72             -- Useless gap.
73             if useless_gap > 0
74             then
75                 -- Top and left clients are shrinked by two steps and
76                 -- get moved away from the border. Other clients just
77                 -- get shrinked in one direction.
78                 if this_x == 0
79                 then
80                     g.width = g.width - 2 * useless_gap
81                     g.x = g.x + useless_gap
82                 else
83                     g.width = g.width - useless_gap
84                 end
85
86                 if this_y == 0
87                 then
88                     g.height = g.height - 2 * useless_gap
89                     g.y = g.y + useless_gap
90                 else
91                     g.height = g.height - useless_gap
92                 end
93             end
94             -- End of useless gap.
95
96             c:geometry(g)
97
98             cell = cell + 1
99             if cell == cells then
100                 cell = 0
101                 strip = strip + 1
102             end
103         end
104     end
105 end
106
107 --- Horizontal fair layout.
108 -- @param screen The screen to arrange.
109 uselessfair.horizontal = {}
110 uselessfair.horizontal.name = "uselessfairh"
111 function uselessfair.horizontal.arrange(p)
112     return fair(p, "east")
113 end
114
115 -- Vertical fair layout.
116 -- @param screen The screen to arrange.
117 uselessfair.name = "uselessfair"
118 function uselessfair.arrange(p)
119     return fair(p, "south")
120 end
121
122 return uselessfair