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d244f439810c3a3ea8a4f01d1a484024597979ee
[etc/awesome.git] / layout / uselesstile.lua
1
2 --[[
3
4      Licensed under GNU General Public License v2
5       * (c) 2014       projektile, worron
6       * (c) 2013       Luke Bonham
7       * (c) 2009       Donald Ephraim Curtis
8       * (c) 2008       Julien Danjolu
9
10 --]]
11
12 local tag       = require("awful.tag")
13 local beautiful = require("beautiful")
14 local ipairs    = ipairs
15 local math      = { floor = math.floor,
16                     ceil  = math.ceil,
17                     max   = math.max,
18                     min   = math.min }
19 local tonumber  = tonumber
20
21 local uselesstile = {}
22
23 -- Transformation functions
24 local function flip(canvas, geometry)
25     return {
26         -- vertical only
27         x = 2 * canvas.x + canvas.width - geometry.x - geometry.width,
28         y = geometry.y,
29         width = geometry.width,
30         height = geometry.height
31     }
32 end
33
34 local function swap(geometry)
35     return { x = geometry.y, y = geometry.x, width = geometry.height, height = geometry.width }
36 end
37
38 -- Find geometry for column/row tiling
39 local function cut_area(wa, total, index, is_horizontal)
40     local wa = is_horizontal and swap(wa) or wa
41     local height = wa.height / total
42
43     local area = {
44         x = wa.x,
45         y = wa.y + (index - 1) * height,
46         width = wa.width,
47         height = height
48     }
49
50     if is_horizontal then area = swap(area) end
51
52     return area
53 end
54
55 -- Client geometry correction depending on useless gap and window border
56 local function size_correction(c, geometry, useless_gap)
57     geometry.width  = math.max(geometry.width  - 2 * c.border_width - useless_gap, 1)
58     geometry.height = math.max(geometry.height - 2 * c.border_width - useless_gap, 1)
59     geometry.x = geometry.x + useless_gap / 2
60     geometry.y = geometry.y + useless_gap / 2
61 end
62
63 -- Tile group of clients in given area
64 -- @canvas need for proper transformation only
65 local function tile_column(canvas, area, list, useless_gap, transformation)
66     for i, c in ipairs(list) do
67         local g = cut_area(area, #list, i)
68
69         -- swap workarea dimensions
70         if transformation.flip then g = flip(canvas, g) end
71         if transformation.swap then g = swap(g) end
72
73         -- useless gap and border correction
74         size_correction(c, g, useless_gap)
75
76         c:geometry(g)
77     end
78 end
79
80 --Main tile function
81 local function tile(p, orientation)
82
83     -- Theme vars
84     local useless_gap = beautiful.useless_gap_width or 0
85     local global_border = beautiful.global_border_width or 0
86
87     -- Aliases
88     local wa = p.workarea
89     local cls = p.clients
90     local t = tag.selected(p.screen)
91
92     -- Nothing to tile here
93     if #cls == 0 then return end
94
95     -- Get tag prop
96     local nmaster = math.min(tag.getnmaster(t), #cls)
97     local mwfact = tag.getmwfact(t)
98
99     if nmaster == 0 then
100         mwfact = 0
101     elseif nmaster == #cls then
102         mwfact = 1
103     end
104
105     -- Workarea size correction depending on useless gap and global border
106     wa.height = wa.height - 2 * global_border - useless_gap
107     wa.width  = wa.width -  2 * global_border - useless_gap
108     wa.x = wa.x + useless_gap / 2 + global_border
109     wa.y = wa.y + useless_gap / 2 + global_border
110
111     -- Find which transformation we need for given orientation
112     local transformation = {
113         swap = orientation == 'top' or orientation == 'bottom',
114         flip = orientation == 'left' or orientation == 'top'
115     }
116
117     -- Swap workarea dimensions if orientation vertical
118     if transformation.swap then wa = swap(wa) end
119
120     -- Split master and other windows
121     local cls_master, cls_other = {}, {}
122
123     for i, c in ipairs(cls) do
124         if i <= nmaster then
125             table.insert(cls_master, c)
126         else
127             table.insert(cls_other, c)
128         end
129     end
130
131     -- Tile master windows
132     local master_area = {
133         x = wa.x,
134         y = wa.y,
135         width  = nmaster > 0 and wa.width * mwfact or 0,
136         height = wa.height
137     }
138
139     tile_column(wa, master_area, cls_master, useless_gap, transformation)
140
141     -- Tile other windows
142     local other_area = {
143         x = wa.x + master_area.width,
144         y = wa.y,
145         width  = wa.width - master_area.width,
146         height = wa.height
147     }
148
149     -- get column number for other windows
150     local ncol = math.min(tag.getncol(t), #cls_other)
151
152     -- split other windows to column groups
153     local last_small_column = ncol - #cls_other % ncol
154     local rows_min = math.floor(#cls_other / ncol)
155
156     local client_index = 1
157     for i = 1, ncol do
158         local position = transformation.flip and ncol - i + 1 or i
159         local rows = i <= last_small_column and rows_min or rows_min + 1
160         local column = {}
161
162         for j = 1, rows do
163             table.insert(column, cls_other[client_index])
164             client_index = client_index + 1
165         end
166
167                 -- and tile
168                 local column_area = cut_area(other_area, ncol, position, true)
169         tile_column(wa, column_area, column, useless_gap, transformation)
170     end
171 end
172
173 -- Layout constructor
174 local function construct_layout(name, orientation)
175     return {
176         name = name,
177         -- @p screen number to tile
178         arrange = function(p) return tile(p, orientation) end
179     }
180 end
181
182 -- Build layouts with different tile direction
183 uselesstile.right  = construct_layout("uselesstile", "right")
184 uselesstile.left   = construct_layout("uselesstileleft", "left")
185 uselesstile.bottom = construct_layout("uselesstilebottom", "bottom")
186 uselesstile.top    = construct_layout("uselesstiletop", "top")
187
188 -- Module aliase
189 uselesstile.arrange = uselesstile.right.arrange
190 uselesstile.name = uselesstile.right.name
191
192 return uselesstile