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Merge pull request #226 from frizinak/master
[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     -- Screen.
53     local wa = p.workarea
54     local cls = p.clients
55
56     -- Borders are factored in.
57     wa.height = wa.height - (global_border * 2)
58     wa.width = wa.width - (global_border * 2)
59     wa.x = wa.x + global_border
60     wa.y = wa.y + global_border
61
62     -- How many vertical columns? Read from nmaster on the tag.
63     local t = tag.selected(p.screen)
64     local num_x = centerfair.nmaster or tag.getnmaster(t)
65     local ncol = centerfair.ncol or tag.getncol(t)
66     if num_x <= 2 then num_x = 2 end
67
68     local width = math.floor((wa.width - (num_x + 1)*useless_gap) / num_x)
69
70     if #cls < num_x
71     then
72         -- Less clients than the number of columns, let's center it!
73         local offset_x = wa.x + (wa.width - #cls*width - (#cls - 1)*useless_gap) / 2
74         local g = {}
75         g.y = wa.y + useless_gap
76         for i = 1, #cls do
77             local c = cls[i]
78             g.width = width - 2*c.border_width
79             g.height = wa.height - 2*useless_gap - 2*c.border_width
80             if g.width < 1 then g.width = 1 end
81             if g.height < 1 then g.height = 1 end
82             g.x = offset_x + (i - 1) * (width + useless_gap)
83             c:geometry(g)
84         end
85     else
86         -- More clients than the number of columns, let's arrange it!
87         -- Master client deserves a special treatement
88         local c = cls[1]
89         local g = {}
90         g.width = wa.width - (num_x - 1)*width - (num_x + 1)*useless_gap - 2*c.border_width
91         g.height = wa.height - 2*useless_gap - 2*c.border_width
92         if g.width < 1 then g.width = 1 end
93         if g.height < 1 then g.height = 1 end
94         g.x = wa.x + useless_gap
95         g.y = wa.y + useless_gap
96
97         c:geometry(g)
98
99         -- Treat the other clients
100
101         -- Compute distribution of clients among columns
102         local num_y ={}
103         do
104             local remaining_clients = #cls-1
105             local ncol_min = math.ceil(remaining_clients/(num_x-1))
106             if ncol >= ncol_min
107             then
108                 for i = (num_x-1), 1, -1 do
109                     if (remaining_clients-i+1) < ncol
110                     then
111                         num_y[i] = remaining_clients-i + 1
112                     else
113                         num_y[i] = ncol
114                     end
115                     remaining_clients = remaining_clients - num_y[i]
116                 end
117             else
118                 local rem = remaining_clients % (num_x-1)
119                 if rem ==0
120                 then
121                     for i = 1, num_x-1 do
122                         num_y[i] = ncol_min
123                     end
124                 else
125                     for i = 1, num_x-1 do
126                         num_y[i] = ncol_min - 1
127                     end
128                     for i = 0, rem-1 do
129                         num_y[num_x-1-i] = num_y[num_x-1-i] + 1
130                     end
131                 end
132             end
133         end
134
135         -- Compute geometry of the other clients
136         local nclient = 2 -- we start with the 2nd client
137         g.x = g.x + g.width + useless_gap + 2*c.border_width
138
139         for i = 1, (num_x-1) do
140             local height = math.floor((wa.height - (num_y[i] + 1)*useless_gap) / num_y[i])
141             g.y = wa.y + useless_gap
142             for j = 0, (num_y[i]-2) do
143                 local c = cls[nclient]
144                 g.height = height - 2*c.border_width
145                 g.width = width - 2*c.border_width
146                 if g.width < 1 then g.width = 1 end
147                 if g.height < 1 then g.height = 1 end
148                 c:geometry(g)
149                 nclient = nclient + 1
150                 g.y = g.y + height + useless_gap
151             end
152             local c = cls[nclient]
153             g.height = wa.height - (num_y[i] + 1)*useless_gap - (num_y[i] - 1)*height - 2*c.border_width
154             g.width = width - 2*c.border_width
155             if g.width < 1 then g.width = 1 end
156             if g.height < 1 then g.height = 1 end
157             c:geometry(g)
158             nclient = nclient + 1
159             g.x = g.x + width + useless_gap
160         end
161     end
162 end
163
164 return centerfair