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Merge pull request #2 from copycat-killer/master
[etc/awesome.git] / layout / termfair.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 math     = { ceil  = math.ceil,
13                    floor = math.floor,
14                    max   = math.max }
15 local screen   = screen
16 local tonumber = tonumber
17
18 local termfair  = { name = "termfair" }
19 termfair.center = { name = "centerfair" }
20
21 local function do_fair(p, orientation)
22     local t = p.tag or screen[p.screen].selected_tag
23     local wa = p.workarea
24     local cls = p.clients
25
26     if #cls == 0 then return end
27
28     if orientation == "west" then
29         -- Layout with fixed number of vertical columns (read from nmaster).
30         -- New windows align from left to right. When a row is full, a now
31         -- one above it is created. Like this:
32
33         --        (1)                (2)                (3)
34         --   +---+---+---+      +---+---+---+      +---+---+---+
35         --   |   |   |   |      |   |   |   |      |   |   |   |
36         --   | 1 |   |   |  ->  | 2 | 1 |   |  ->  | 3 | 2 | 1 |  ->
37         --   |   |   |   |      |   |   |   |      |   |   |   |
38         --   +---+---+---+      +---+---+---+      +---+---+---+
39
40         --        (4)                (5)                (6)
41         --   +---+---+---+      +---+---+---+      +---+---+---+
42         --   | 4 |   |   |      | 5 | 4 |   |      | 6 | 5 | 4 |
43         --   +---+---+---+  ->  +---+---+---+  ->  +---+---+---+
44         --   | 3 | 2 | 1 |      | 3 | 2 | 1 |      | 3 | 2 | 1 |
45         --   +---+---+---+      +---+---+---+      +---+---+---+
46
47         -- How many vertical columns? Read from nmaster on the tag.
48         local num_x = tonumber(termfair.nmaster) or t.master_count
49         local ncol  = tonumber(termfair.ncol) or t.column_count
50
51         if num_x <= 2 then num_x = 2 end
52         if ncol  <= 1 then ncol  = 1 end
53         local width = math.floor(wa.width/num_x)
54
55         local num_y     = math.max(math.ceil(#cls / num_x), ncol)
56         local height    = math.floor(wa.height/num_y)
57         local cur_num_x = num_x
58         local at_x      = 0
59         local at_y      = 0
60
61         local remaining_clients = #cls
62
63         -- We start the first row. Left-align by limiting the number of
64         -- available slots.
65         if remaining_clients < num_x then
66             cur_num_x = remaining_clients
67         end
68
69         -- Iterate in reversed order.
70         for i = #cls,1,-1 do
71             -- Get x and y position.
72             local c = cls[i]
73             local this_x = cur_num_x - at_x - 1
74             local this_y = num_y - at_y - 1
75
76             -- Calculate geometry.
77             local g = {}
78             if this_x == (num_x - 1) then
79                 g.width = wa.width - (num_x - 1)*width
80             else
81                 g.width = width
82             end
83
84             if this_y == (num_y - 1) then
85                 g.height = wa.height - (num_y - 1)*height
86             else
87                 g.height = height
88             end
89
90             g.x = wa.x + this_x*width
91             g.y = wa.y + this_y*height
92
93             if g.width  < 1 then g.width  = 1 end
94             if g.height < 1 then g.height = 1 end
95
96             p.geometries[c] = g
97
98             remaining_clients = remaining_clients - 1
99
100             -- Next grid position.
101             at_x = at_x + 1
102             if at_x == num_x then
103                 -- Row full, create a new one above it.
104                 at_x = 0
105                 at_y = at_y + 1
106
107                 -- We start a new row. Left-align.
108                 if remaining_clients < num_x then
109                     cur_num_x = remaining_clients
110                 end
111             end
112         end
113     elseif orientation == "center" then
114         -- Layout with fixed number of vertical columns (read from nmaster).
115         -- Cols are centerded until there is nmaster columns, then windows
116         -- are stacked in the slave columns, with at most ncol clients per
117         -- column if possible.
118
119         -- with nmaster=3 and ncol=1 you'll have
120         --        (1)                (2)                (3)
121         --   +---+---+---+      +-+---+---+-+      +---+---+---+
122         --   |   |   |   |      | |   |   | |      |   |   |   |
123         --   |   | 1 |   |  ->  | | 1 | 2 | | ->   | 1 | 2 | 3 |  ->
124         --   |   |   |   |      | |   |   | |      |   |   |   |
125         --   +---+---+---+      +-+---+---+-+      +---+---+---+
126
127         --        (4)                (5)
128         --   +---+---+---+      +---+---+---+
129         --   |   |   | 3 |      |   | 2 | 4 |
130         --   + 1 + 2 +---+  ->  + 1 +---+---+
131         --   |   |   | 4 |      |   | 3 | 5 |
132         --   +---+---+---+      +---+---+---+
133
134         -- How many vertical columns? Read from nmaster on the tag.
135         local num_x = tonumber(termfair.center.nmaster) or t.master_count
136         local ncol  = tonumber(termfair.center.ncol) or t.column_count
137
138         if num_x <= 2 then num_x = 2 end
139         if ncol  <= 1 then ncol  = 1 end
140
141         local width = math.floor(wa.width / num_x)
142
143         if #cls < num_x then
144             -- Less clients than the number of columns, let's center it!
145             local offset_x = wa.x + (wa.width - #cls*width) / 2
146             for i = 1, #cls do
147                 local g = { y = wa.y }
148                 g.width  = width
149                 g.height = wa.height
150                 if g.width < 1 then g.width = 1 end
151                 if g.height < 1 then g.height = 1 end
152                 g.x = offset_x + (i - 1) * width
153                 p.geometries[cls[i]] = g
154             end
155         else
156             -- More clients than the number of columns, let's arrange it!
157             -- Master client deserves a special treatement
158             local g = {}
159             g.width = wa.width - (num_x - 1)*width
160             g.height = wa.height
161             if g.width < 1 then g.width = 1 end
162             if g.height < 1 then g.height = 1 end
163             g.x = wa.x
164             g.y = wa.y
165             p.geometries[cls[1]] = g
166
167             -- Treat the other clients
168
169             -- Compute distribution of clients among columns
170             local num_y = {}
171             local remaining_clients = #cls-1
172             local ncol_min = math.ceil(remaining_clients/(num_x-1))
173
174             if ncol >= ncol_min then
175                 for i = (num_x-1), 1, -1 do
176                     if (remaining_clients-i+1) < ncol then
177                         num_y[i] = remaining_clients-i + 1
178                     else
179                         num_y[i] = ncol
180                     end
181                     remaining_clients = remaining_clients - num_y[i]
182                 end
183             else
184                 local rem = remaining_clients % (num_x-1)
185                 if rem == 0 then
186                     for i = 1, num_x-1 do
187                         num_y[i] = ncol_min
188                     end
189                 else
190                     for i = 1, num_x-1 do
191                         num_y[i] = ncol_min - 1
192                     end
193                     for i = 0, rem-1 do
194                         num_y[num_x-1-i] = num_y[num_x-1-i] + 1
195                     end
196                 end
197             end
198
199             -- Compute geometry of the other clients
200             local nclient = 2 -- we start with the 2nd client
201             local wx = g.x + g.width
202             for i = 1, (num_x-1) do
203                 local height = math.floor(wa.height / num_y[i])
204                 local wy = wa.y
205                 for j = 0, (num_y[i]-2) do
206                     local g = {}
207                     g.x = wx
208                     g.y = wy
209                     g.height = height
210                     g.width = width
211                     if g.width < 1 then g.width = 1 end
212                     if g.height < 1 then g.height = 1 end
213                     p.geometries[cls[nclient]] = g
214                     nclient = nclient + 1
215                     wy = wy + height
216                 end
217                 local g = {}
218                 g.x = wx
219                 g.y = wy
220                 g.height = wa.height - (num_y[i] - 1)*height
221                 g.width = width
222                 if g.width < 1 then g.width = 1 end
223                 if g.height < 1 then g.height = 1 end
224                 p.geometries[cls[nclient]] = g
225                 nclient = nclient + 1
226                 wx = wx + width
227             end
228         end
229     end
230 end
231
232 function termfair.center.arrange(p)
233     return do_fair(p, "center")
234 end
235
236 function termfair.arrange(p)
237     return do_fair(p, "west")
238 end
239
240 return termfair