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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) or 0
22
23     local wa = p.workarea
24     local cls = p.clients
25
26     if #cls > 0 then
27         local cells = math.ceil(math.sqrt(#cls))
28         local strips = math.ceil(#cls / cells)
29
30         local cell = 0
31         local strip = 0
32         for k, c in ipairs(cls) do
33             local g = {}
34             -- Save actual grid index for use in the useless_gap
35             -- routine.
36             local this_x = 0
37             local this_y = 0
38             if ( orientation == "east" and #cls > 2 )
39             or ( orientation == "south" and #cls <= 2 ) then
40                 if #cls < (strips * cells) and strip == strips - 1 then
41                     g.width = wa.width / (cells - ((strips * cells) - #cls))
42                 else
43                     g.width = wa.width / cells
44                 end
45                 g.height = wa.height / strips
46
47                 this_x = cell
48                 this_y = strip
49
50                 g.x = wa.x + cell * g.width
51                 g.y = wa.y + strip * g.height
52
53             else
54                 if #cls < (strips * cells) and strip == strips - 1 then
55                     g.height = wa.height / (cells - ((strips * cells) - #cls))
56                 else
57                     g.height = wa.height / cells
58                 end
59                 g.width = wa.width / strips
60
61                 this_x = strip
62                 this_y = cell
63
64                 g.x = wa.x + strip * g.width
65                 g.y = wa.y + cell * g.height
66             end
67
68             -- Useless gap.
69             if useless_gap > 0
70             then
71                 -- Top and left clients are shrinked by two steps and
72                 -- get moved away from the border. Other clients just
73                 -- get shrinked in one direction.
74                 if this_x == 0
75                 then
76                     g.width = g.width - 2 * useless_gap
77                     g.x = g.x + useless_gap
78                 else
79                     g.width = g.width - useless_gap
80                 end
81
82                 if this_y == 0
83                 then
84                     g.height = g.height - 2 * useless_gap
85                     g.y = g.y + useless_gap
86                 else
87                     g.height = g.height - useless_gap 
88                 end
89             end
90             -- End of useless gap.
91
92             c:geometry(g)
93
94             cell = cell + 1
95             if cell == cells then
96                 cell = 0
97                 strip = strip + 1
98             end
99         end
100     end
101 end
102
103 --- Horizontal fair layout.
104 -- @param screen The screen to arrange.
105 uselessfair.horizontal = {}
106 uselessfair.horizontal.name = "uselessfairh"
107 function uselessfair.horizontal.arrange(p)
108     return fair(p, "east")
109 end
110
111 -- Vertical fair layout.
112 -- @param screen The screen to arrange.
113 uselessfair.name = "uselessfair"
114 function uselessfair.arrange(p)
115     return fair(p, "south")
116 end
117
118 return uselessfair