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[etc/awesome.git] / layout / cascade.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2014,      projektile                 
6       * (c) 2013,      Luke Bonham                
7       * (c) 2010-2012, Peter Hofmann              
8                                                   
9 --]]
10
11 local scr      = require("awful.screen")
12 local tonumber = tonumber
13
14 local cascade = {
15     name     = "cascade",
16     nmaster  = 0,
17     offset_x = 32,
18     offset_y = 8,
19     tile     = {
20         name          = "cascadetile",
21         nmaster       = 0,
22         ncol          = 0,
23         mwfact        = 0,
24         offset_x      = 5,
25         offset_y      = 32,
26         extra_padding = 0
27     }
28 }
29
30 local function do_cascade(p, tiling)
31     -- Screen.
32     local wa  = p.workarea
33     local cls = p.clients
34     local ta = scr.focused().selected_tag
35
36     if not ta then return end
37
38     if #cls <= 0 then return end
39
40     -- Useless gaps.
41     local useless_gap = p.useless_gap or 0
42
43     if not tiling then
44         -- Cascade windows.
45
46         local num_c
47         if cascade.nmaster > 0 then
48             num_c = cascade.nmaster
49         else
50             num_c = ta.master_count
51         end
52
53         -- Opening a new window will usually force all existing windows to
54         -- get resized. This wastes a lot of CPU time. So let's set a lower
55         -- bound to "how_many": This wastes a little screen space but you'll
56         -- get a much better user experience.
57         local how_many = (#cls >= num_c and #cls) or num_c
58
59         local current_offset_x = cascade.offset_x * (how_many - 1)
60         local current_offset_y = cascade.offset_y * (how_many - 1)
61
62         -- Iterate.
63         for i = 1,#cls,1 do
64             local c = cls[i]
65             local g = {}
66
67             g.x      = wa.x + (how_many - i) * cascade.offset_x
68             g.y      = wa.y + (i - 1) * cascade.offset_y
69             g.width  = wa.width - current_offset_x - 2*c.border_width
70             g.height = wa.height - current_offset_y - 2*c.border_width
71
72             if g.width  < 1 then g.width  = 1 end
73             if g.height < 1 then g.height = 1 end
74
75             c:geometry(g)
76         end
77     else
78         -- Layout with one fixed column meant for a master window. Its
79         -- width is calculated according to mwfact. Other clients are
80         -- cascaded or "tabbed" in a slave column on the right.
81
82         --         (1)                 (2)                 (3)                 (4)
83         --   +----------+---+    +----------+---+    +----------+---+    +----------+---+
84         --   |          |   |    |          | 3 |    |          | 4 |    |         +---+|
85         --   |          |   | -> |          |   | -> |         +---++ -> |        +---+|+
86         --   |  1       | 2 |    |  1      +---++    |  1      | 3 ||    |  1    +---+|+|
87         --   |          |   |    |         | 2 ||    |        +---++|    |      +---+|+ |
88         --   |          |   |    |         |   ||    |        | 2 | |    |      | 2 |+  |
89         --   +----------+---+    +---------+---++    +--------+---+-+    +------+---+---+
90
91         local mwfact
92         if cascade.tile.mwfact > 0 then
93             mwfact = cascade.tile.mwfact
94         else
95             mwfact = ta.master_width_factor
96         end
97
98         -- Make slave windows overlap main window? Do this if ncol is 1.
99         local overlap_main
100         if cascade.tile.ncol > 0 then
101             overlap_main = cascade.tile.ncol
102         else
103             overlap_main = ta.column_count
104         end
105
106         -- Minimum space for slave windows? See cascade.tile.lua.
107         local num_c
108         if cascade.tile.nmaster > 0 then
109             num_c = cascade.tile.nmaster
110         else
111             num_c = ta.master_count
112         end
113
114         local how_many = (#cls - 1 >= num_c and (#cls - 1)) or num_c
115
116         local current_offset_x = cascade.tile.offset_x * (how_many - 1)
117         local current_offset_y = cascade.tile.offset_y * (how_many - 1)
118
119         if #cls <= 0 then return end
120
121         -- Main column, fixed width and height.
122         local c = cls[1]
123         local g = {}
124         -- Subtracting the useless_gap width from the work area width here
125         -- makes this mwfact calculation work the same as in uselesstile.
126         -- Rounding is necessary to prevent the rendered size of slavewid
127         -- from being 1 pixel off when the result is not an integer.
128         local mainwid = math.floor((wa.width - useless_gap) * mwfact)
129         local slavewid = wa.width - mainwid
130
131         if overlap_main == 1 then
132             g.width = wa.width - 2*c.border_width
133
134             -- The size of the main window may be reduced a little bit.
135             -- This allows you to see if there are any windows below the
136             -- main window.
137             -- This only makes sense, though, if the main window is
138             -- overlapping everything else.
139             g.width = g.width - cascade.tile.extra_padding
140         else
141             g.width = mainwid - 2*c.border_width
142         end
143
144         g.height = wa.height - 2*c.border_width
145         g.x = wa.x
146         g.y = wa.y
147         if useless_gap > 0 then
148             -- Reduce width once and move window to the right.
149             -- Reduce height twice, however.
150             g.width = g.width - useless_gap
151             g.height = g.height - 2 * useless_gap
152             g.x = g.x + useless_gap
153             g.y = g.y + useless_gap
154
155             -- When there's no window to the right, add an additional gap.
156             if overlap_main == 1 then g.width = g.width - useless_gap end
157         end
158         if g.width < 1 then g.width = 1 end
159         if g.height < 1 then g.height = 1 end
160         c:geometry(g)
161
162         -- Remaining clients stacked in slave column, new ones on top.
163         if #cls > 1 then
164             for i = 2,#cls do
165                 c = cls[i]
166                 g = {}
167                 g.width = slavewid - current_offset_x - 2*c.border_width
168                 g.height = wa.height - current_offset_y - 2*c.border_width
169                 g.x = wa.x + mainwid + (how_many - (i - 1)) * cascade.tile.offset_x
170                 g.y = wa.y + (i - 2) * cascade.tile.offset_y
171
172                 if useless_gap > 0 then
173                     g.width = g.width - 2 * useless_gap
174                     g.height = g.height - 2 * useless_gap
175                     g.x = g.x + useless_gap
176                     g.y = g.y + useless_gap
177                 end
178
179                 if g.width < 1 then g.width = 1 end
180                 if g.height < 1 then g.height = 1 end
181
182                 c:geometry(g)
183             end
184         end
185     end
186 end
187
188 function cascade.tile.arrange(p)
189     return do_cascade(p, true)
190 end
191
192 function cascade.arrange(p)
193     return do_cascade(p, false)
194 end
195
196 return cascade