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67462f77891b42af2500ae01b667d04a024addd7
[etc/awesome.git] / layout / centerfair.lua
1
2 --[[
3                                                  
4      Licensed under GNU General Public License v2
5       * (c) 2014,      projektile                
6       * (c) 2013,      Luke Bonham               
7       * (c) 2010,      Nicolas Estibals          
8       * (c) 2010-2012, Peter Hofmann             
9                                                  
10 --]]
11
12 local tag       = require("awful.tag")
13 local beautiful = require("beautiful")
14 local math      = { ceil  = math.ceil,
15                     floor = math.floor,
16                     max   = math.max }
17 local tonumber  = tonumber
18
19 local centerfair  = { name = "centerfair" }
20
21 function centerfair.arrange(p)
22     -- Layout with fixed number of vertical columns (read from nmaster).
23     -- Cols are centerded until there is nmaster columns, then windows
24     -- are stacked in the slave columns, with at most ncol clients per
25     -- column if possible.
26
27     -- with nmaster=3 and ncol=1 you'll have
28     --        (1)                (2)                (3)
29     --   +---+---+---+      +-+---+---+-+      +---+---+---+
30     --   |   |   |   |      | |   |   | |      |   |   |   |
31     --   |   | 1 |   |  ->  | | 1 | 2 | | ->   | 1 | 2 | 3 |  ->
32     --   |   |   |   |      | |   |   | |      |   |   |   |
33     --   +---+---+---+      +-+---+---+-+      +---+---+---+
34
35     --        (4)                (5)
36     --   +---+---+---+      +---+---+---+
37     --   |   |   | 3 |      |   | 2 | 4 |
38     --   + 1 + 2 +---+  ->  + 1 +---+---+
39     --   |   |   | 4 |      |   | 3 | 5 |
40     --   +---+---+---+      +---+---+---+
41
42     -- A useless gap (like the dwm patch) can be defined with
43     -- beautiful.useless_gap_width .
44     local useless_gap = tonumber(beautiful.useless_gap_width) or 0
45     if useless_gap < 0 then useless_gap = 0 end
46
47     -- A global border can be defined with
48     -- beautiful.global_border_width
49     local global_border = tonumber(beautiful.global_border_width) or 0
50     if global_border < 0 then global_border = 0 end
51
52     -- Themes border width requires an offset
53     local bw = tonumber(beautiful.border_width) or 0
54
55     -- Screen.
56     local wa = p.workarea
57     local cls = p.clients
58
59     -- Borders are factored in.
60     wa.height = wa.height - ((global_border * 2) + (bw * 2))
61     wa.width = wa.width - ((global_border * 2) + (bw * 2))
62
63     -- How many vertical columns? Read from nmaster on the tag.
64     local t = tag.selected(p.screen)
65     local num_x = centerfair.nmaster or tag.getnmaster(t)
66     local ncol = centerfair.ncol or tag.getncol(t)
67     if num_x <= 2 then num_x = 2 end
68
69     local width = math.floor((wa.width-(num_x+1)*useless_gap) / num_x)
70
71     local offset_y = wa.y + useless_gap
72     if #cls < num_x
73     then
74         -- Less clients than the number of columns, let's center it!
75         local offset_x = wa.x + useless_gap + (wa.width - #cls*width - (#cls+1)*useless_gap) / 2
76         local g = {}
77         g.width = width
78         g.height = wa.height - 2*useless_gap - 2
79         g.y = offset_y + global_border
80         for i = 1, #cls do
81             g.x = offset_x + (#cls - i) * (width + useless_gap + 2) + global_border
82             cls[i]:geometry(g)
83         end
84     else
85         -- More clients than the number of columns, let's arrange it!
86         local offset_x = wa.x
87         if useless_gap > 0 then
88            offset_x = offset_x
89         end
90
91         -- Master client deserves a special treatement
92         local g = {}
93         g.width = wa.width - (num_x  - 1) * width - num_x * 2*useless_gap - 2 
94         g.height = wa.height - 2*useless_gap - 2
95         g.x = offset_x + useless_gap + global_border
96         g.y = offset_y + global_border
97
98         cls[#cls]:geometry(g)
99
100         -- Treat the other clients
101
102         -- Compute distribution of clients among columns
103         local num_y ={}
104         do
105             local remaining_clients = #cls-1
106             local ncol_min = math.ceil(remaining_clients/(num_x-1))
107             if ncol >= ncol_min
108             then
109                 for i = (num_x-1), 1, -1 do
110                     if (remaining_clients-i+1) < ncol
111                     then
112                         num_y[i] = remaining_clients-i + 1
113                     else
114                         num_y[i] = ncol
115                     end
116                     remaining_clients = remaining_clients - num_y[i]
117                 end
118             else
119                 local rem = remaining_clients % (num_x-1)
120                 if rem ==0
121                 then
122                     for i = 1, num_x-1 do
123                         num_y[i] = ncol_min
124                     end
125                 else
126                     for i = 1, num_x-1 do
127                         num_y[i] = ncol_min - 1
128                     end
129                     for i = 0, rem-1 do
130                         num_y[num_x-1-i] = num_y[num_x-1-i] + 1
131                     end
132                 end
133             end
134         end
135
136         -- Compute geometry of the other clients
137         local nclient = #cls-1 -- we start with the 2nd client
138         g.x = g.x + g.width+useless_gap + 2
139         g.width = width
140
141         if useless_gap > 0 then
142             g.width = g.width + useless_gap - 2
143         end
144
145         for i = 1, (num_x-1) do
146             to_remove = 2
147             g.height = math.floor((wa.height - (num_y[i] * useless_gap)) / num_y[i])
148             g.y = offset_y + global_border
149             for j = 0, (num_y[i]-2) do
150                 cls[nclient]:geometry(g)
151                 nclient = nclient - 1
152                 g.y = g.y + g.height+useless_gap + 2
153                 to_remove = to_remove + 2
154             end
155             g.height = wa.height - num_y[i]*useless_gap - (num_y[i]-1)*g.height - useless_gap - to_remove
156             cls[nclient]:geometry(g)
157             nclient = nclient - 1
158             g.x = g.x+g.width+useless_gap + 2
159         end
160     end
161 end
162
163 return centerfair