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issue #7 fix
[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) or 0
47
48     -- Screen.
49     local wa = p.workarea
50     local cls = p.clients
51
52     -- Width of main column?
53     local t = tag.selected(p.screen)
54     local mwfact
55     if cascadetile.mwfact > 0
56     then
57         mwfact = cascadetile.mwfact
58     else
59         mwfact = tag.getmwfact(t)
60     end
61
62     -- Make slave windows overlap main window? Do this if ncol is 1.
63     local overlap_main
64     if cascadetile.ncol > 0
65     then
66         overlap_main = cascadetile.ncol
67     else
68         overlap_main = tag.getncol(t)
69     end
70
71     -- Minimum space for slave windows? See cascade.lua.
72     local num_c
73     if cascadetile.nmaster > 0
74     then
75         num_c = cascadetile.nmaster
76     else
77         num_c = tag.getnmaster(t)
78     end
79
80     local how_many = #cls - 1
81     if how_many < num_c
82     then
83         how_many = num_c
84     end
85     local current_offset_x = cascadetile.offset_x * (how_many - 1)
86     local current_offset_y = cascadetile.offset_y * (how_many - 1)
87
88     if #cls > 0
89     then
90         -- Main column, fixed width and height.
91         local c = cls[#cls]
92         local g = {}
93         local mainwid = wa.width * mwfact
94         local slavewid = wa.width - mainwid
95
96         if overlap_main == 1
97         then
98             g.width = wa.width
99
100             -- The size of the main window may be reduced a little bit.
101             -- This allows you to see if there are any windows below the
102             -- main window.
103             -- This only makes sense, though, if the main window is
104             -- overlapping everything else.
105             g.width = g.width - cascadetile.extra_padding
106         else
107             g.width = mainwid
108         end
109
110         g.height = wa.height
111         g.x = wa.x
112         g.y = wa.y
113         if useless_gap > 0
114         then
115             -- Reduce width once and move window to the right. Reduce
116             -- height twice, however.
117             g.width = g.width - useless_gap
118             g.height = g.height - 2 * useless_gap
119             g.x = g.x + useless_gap
120             g.y = g.y + useless_gap
121
122             -- When there's no window to the right, add an additional
123             -- gap.
124             if overlap_main == 1
125             then
126                 g.width = g.width - useless_gap
127             end
128         end
129         c:geometry(g)
130
131         -- Remaining clients stacked in slave column, new ones on top.
132         if #cls > 1
133         then
134             for i = (#cls - 1),1,-1
135             do
136                 c = cls[i]
137                 g = {}
138                 g.width = slavewid - current_offset_x
139                 g.height = wa.height - current_offset_y
140                 g.x = wa.x + mainwid + (how_many - i) * cascadetile.offset_x
141                 g.y = wa.y + (i - 1) * cascadetile.offset_y
142                 if useless_gap > 0
143                 then
144                     g.width = g.width - 2 * useless_gap
145                     g.height = g.height - 2 * useless_gap
146                     g.x = g.x + useless_gap
147                     g.y = g.y + useless_gap
148                 end
149                 c:geometry(g)
150             end
151         end
152     end
153 end
154
155 return cascadetile