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widget.fs: fixed first column formatting adjustment; closes #423
[etc/awesome.git] / layout / cascade.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2014,      projektile
5       * (c) 2013,      Luca CPZ
6       * (c) 2010-2012, Peter Hofmann
7
8 --]]
9
10 local floor  = math.floor
11 local screen = screen
12
13 local cascade = {
14     name     = "cascade",
15     nmaster  = 0,
16     offset_x = 32,
17     offset_y = 8,
18     tile     = {
19         name          = "cascadetile",
20         nmaster       = 0,
21         ncol          = 0,
22         mwfact        = 0,
23         offset_x      = 5,
24         offset_y      = 32,
25         extra_padding = 0
26     }
27 }
28
29 local function do_cascade(p, tiling)
30     local t = p.tag or screen[p.screen].selected_tag
31     local wa = p.workarea
32     local cls = p.clients
33
34     if #cls == 0 then return end
35
36     if not tiling then
37         -- Cascade windows.
38
39         local num_c
40         if cascade.nmaster > 0 then
41             num_c = cascade.nmaster
42         else
43             num_c = t.master_count
44         end
45
46         -- Opening a new window will usually force all existing windows to
47         -- get resized. This wastes a lot of CPU time. So let's set a lower
48         -- bound to "how_many": This wastes a little screen space but you'll
49         -- get a much better user experience.
50         local how_many = (#cls >= num_c and #cls) or num_c
51
52         local current_offset_x = cascade.offset_x * (how_many - 1)
53         local current_offset_y = cascade.offset_y * (how_many - 1)
54
55         -- Iterate.
56         for i = 1,#cls,1 do
57             local c = cls[i]
58             local g = {}
59
60             g.x      = wa.x + (how_many - i) * cascade.offset_x
61             g.y      = wa.y + (i - 1) * cascade.offset_y
62             g.width  = wa.width - current_offset_x
63             g.height = wa.height - current_offset_y
64
65             if g.width  < 1 then g.width  = 1 end
66             if g.height < 1 then g.height = 1 end
67
68             p.geometries[c] = g
69         end
70     else
71         -- Layout with one fixed column meant for a master window. Its
72         -- width is calculated according to mwfact. Other clients are
73         -- cascaded or "tabbed" in a slave column on the right.
74
75         --         (1)                 (2)                 (3)                 (4)
76         --   +----------+---+    +----------+---+    +----------+---+    +----------+---+
77         --   |          |   |    |          | 3 |    |          | 4 |    |         +---+|
78         --   |          |   | -> |          |   | -> |         +---++ -> |        +---+|+
79         --   |  1       | 2 |    |  1      +---++    |  1      | 3 ||    |  1    +---+|+|
80         --   |          |   |    |         | 2 ||    |        +---++|    |      +---+|+ |
81         --   |          |   |    |         |   ||    |        | 2 | |    |      | 2 |+  |
82         --   +----------+---+    +---------+---++    +--------+---+-+    +------+---+---+
83
84         local mwfact
85         if cascade.tile.mwfact > 0 then
86             mwfact = cascade.tile.mwfact
87         else
88             mwfact = t.master_width_factor
89         end
90
91         -- Make slave windows overlap main window? Do this if ncol is 1.
92         local overlap_main
93         if cascade.tile.ncol > 0 then
94             overlap_main = cascade.tile.ncol
95         else
96             overlap_main = t.column_count
97         end
98
99         -- Minimum space for slave windows? See cascade.tile.lua.
100         local num_c
101         if cascade.tile.nmaster > 0 then
102             num_c = cascade.tile.nmaster
103         else
104             num_c = t.master_count
105         end
106
107         local how_many = (#cls - 1 >= num_c and (#cls - 1)) or num_c
108
109         local current_offset_x = cascade.tile.offset_x * (how_many - 1)
110         local current_offset_y = cascade.tile.offset_y * (how_many - 1)
111
112         if #cls <= 0 then return end
113
114         -- Main column, fixed width and height.
115         local c = cls[1]
116         local g = {}
117         -- Rounding is necessary to prevent the rendered size of slavewid
118         -- from being 1 pixel off when the result is not an integer.
119         local mainwid = floor(wa.width * mwfact)
120         local slavewid = wa.width - mainwid
121
122         if overlap_main == 1 then
123             g.width = wa.width
124
125             -- The size of the main window may be reduced a little bit.
126             -- This allows you to see if there are any windows below the
127             -- main window.
128             -- This only makes sense, though, if the main window is
129             -- overlapping everything else.
130             g.width = g.width - cascade.tile.extra_padding
131         else
132             g.width = mainwid
133         end
134
135         g.height = wa.height
136         g.x = wa.x
137         g.y = wa.y
138
139         if g.width < 1  then g.width  = 1 end
140         if g.height < 1 then g.height = 1 end
141
142         p.geometries[c] = g
143
144         -- Remaining clients stacked in slave column, new ones on top.
145         if #cls <= 1 then return end
146         for i = 2,#cls do
147             c = cls[i]
148             g = {}
149
150             g.width  = slavewid - current_offset_x
151             g.height = wa.height - current_offset_y
152
153             g.x = wa.x + mainwid + (how_many - (i - 1)) * cascade.tile.offset_x
154             g.y = wa.y + (i - 2) * cascade.tile.offset_y
155
156             if g.width < 1  then g.width  = 1 end
157             if g.height < 1 then g.height = 1 end
158
159             p.geometries[c] = g
160         end
161     end
162 end
163
164 function cascade.tile.arrange(p)
165     return do_cascade(p, true)
166 end
167
168 function cascade.arrange(p)
169     return do_cascade(p, false)
170 end
171
172 return cascade