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[etc/awesome.git] / layout / cascadetile.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2013,      Luke Bonham                
6       * (c) 2010-2012, Peter Hofmann              
7                                                   
8 --]]
9
10 local tag       = require("awful.tag")
11 local beautiful = require("beautiful")
12 local tonumber  = tonumber
13
14 local cascadetile =
15 {
16     name          = "cascadetile",
17     nmaster       = 0,
18     ncol          = 0,
19     mwfact        = 0,
20     offset_x      = 5,
21     offset_y      = 32,
22     extra_padding = 0
23 }
24
25 function cascadetile.arrange(p)
26
27     -- Layout with one fixed column meant for a master window. Its
28     -- width is calculated according to mwfact. Other clients are
29     -- cascaded or "tabbed" in a slave column on the right.
30
31     -- It's a bit hard to demonstrate the behaviour with ASCII-images...
32     --
33     --       (1)              (2)              (3)              (4)
34     --   +-----+---+      +-----+---+      +-----+---+      +-----+---+
35     --   |     |   |      |     |   |      |     |   |      |     | 4 |
36     --   |     |   |      |     | 2 |      |     | 3 |      |     |   |
37     --   |  1  |   |  ->  |  1  |   |  ->  |  1  |   |  ->  |  1  +---+
38     --   |     |   |      |     +---+      |     +---+      |     | 3 |
39     --   |     |   |      |     |   |      |     | 2 |      |     |---|
40     --   |     |   |      |     |   |      |     |---|      |     | 2 |
41     --   |     |   |      |     |   |      |     |   |      |     |---|
42     --   +-----+---+      +-----+---+      +-----+---+      +-----+---+
43
44     -- A useless gap (like the dwm patch) can be defined with
45     -- beautiful.useless_gap_width.
46     local useless_gap = tonumber(beautiful.useless_gap_width)
47     if useless_gap == nil
48     then
49         useless_gap = 0
50     end
51
52     -- Screen.
53     local wa = p.workarea
54     local cls = p.clients
55
56     -- Width of main column?
57     local t = tag.selected(p.screen)
58     local mwfact
59     if cascadetile.mwfact > 0
60     then
61         mwfact = cascadetile.mwfact
62     else
63         mwfact = tag.getmwfact(t)
64     end
65
66     -- Make slave windows overlap main window? Do this if ncol is 1.
67     local overlap_main
68     if cascadetile.ncol > 0
69     then
70         overlap_main = cascadetile.ncol
71     else
72         overlap_main = tag.getncol(t)
73     end
74
75     -- Minimum space for slave windows? See cascade.lua.
76     local num_c
77     if cascadetile.nmaster > 0
78     then
79         num_c = cascadetile.nmaster
80     else
81         num_c = tag.getnmaster(t)
82     end
83
84     local how_many = #cls - 1
85     if how_many < num_c
86     then
87         how_many = num_c
88     end
89     local current_offset_x = cascadetile.offset_x * (how_many - 1)
90     local current_offset_y = cascadetile.offset_y * (how_many - 1)
91
92     if #cls > 0
93     then
94         -- Main column, fixed width and height.
95         local c = cls[#cls]
96         local g = {}
97         local mainwid = wa.width * mwfact
98         local slavewid = wa.width - mainwid
99
100         if overlap_main == 1
101         then
102             g.width = wa.width
103
104             -- The size of the main window may be reduced a little bit.
105             -- This allows you to see if there are any windows below the
106             -- main window.
107             -- This only makes sense, though, if the main window is
108             -- overlapping everything else.
109             g.width = g.width - cascadetile.extra_padding
110         else
111             g.width = mainwid
112         end
113
114         g.height = wa.height
115         g.x = wa.x
116         g.y = wa.y
117         if useless_gap > 0
118         then
119             -- Reduce width once and move window to the right. Reduce
120             -- height twice, however.
121             g.width = g.width - useless_gap
122             g.height = g.height - 2 * useless_gap
123             g.x = g.x + useless_gap
124             g.y = g.y + useless_gap
125
126             -- When there's no window to the right, add an additional
127             -- gap.
128             if overlap_main == 1
129             then
130                 g.width = g.width - useless_gap
131             end
132         end
133         c:geometry(g)
134
135         -- Remaining clients stacked in slave column, new ones on top.
136         if #cls > 1
137         then
138             for i = (#cls - 1),1,-1
139             do
140                 c = cls[i]
141                 g = {}
142                 g.width = slavewid - current_offset_x
143                 g.height = wa.height - current_offset_y
144                 g.x = wa.x + mainwid + (how_many - i) * cascadetile.offset_x
145                 g.y = wa.y + (i - 1) * cascadetile.offset_y
146                 if useless_gap > 0
147                 then
148                     g.width = g.width - 2 * useless_gap
149                     g.height = g.height - 2 * useless_gap
150                     g.x = g.x + useless_gap
151                     g.y = g.y + useless_gap
152                 end
153                 c:geometry(g)
154             end
155         end
156     end
157 end
158
159 return cascadetile