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071f16f513d6c94a9e5cc5b94b2806630c4c00bb
[etc/awesome.git] / util / menu_iterator.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2017, Simon Désaulniers <sim.desaulniers@gmail.com>
5       * (c) 2017, Uli Schlachter
6       * (c) 2017, Jeferson Siqueira <jefersonlsiq@gmail.com>
7
8 --]]
9
10 -- Menu iterator using naughty.notify
11
12 local naughty = require("naughty")
13
14 local state = { cid = nil }
15
16 local function naughty_destroy_callback(reason)
17     if reason == naughty.notificationClosedReason.expired or
18         reason == naughty.notificationClosedReason.dismissedByUser then
19         local actions = state.index and state.menu[state.index - 1][2]
20         if actions then
21             for _,action in pairs(actions) do
22                 -- don't try to call nil callbacks
23                 if action then action() end
24             end
25             state.index = nil
26         end
27     end
28 end
29
30 -- Iterates over a list of pairs {label, {callbacks}}. After timeout, the last
31 -- visited choice associated callbacks are executed.
32 -- * menu:    a list of pairs {label, {callbacks}
33 -- * timeout: time to wait before confirming menu selection
34 -- * icon:    icon to display left to the choiced label
35 local function iterate(menu, timeout, icon)
36     timeout = timeout or 4 -- default timeout for each menu entry
37     icon    = icon or nil  -- icon to display on the menu
38
39     -- Build the list of choices
40     if not state.index then
41         state.menu = menu
42         state.index = 1
43     end
44
45     -- Select one and display the appropriate notification
46     local label, action
47     local next  = state.menu[state.index]
48     state.index = state.index + 1
49
50     if not next then
51         label = "Cancel"
52         state.index = nil
53     else
54         label, _ = unpack(next)
55     end
56     state.cid = naughty.notify({
57         text = label,
58         icon = icon,
59         timeout = timeout,
60         screen = mouse.screen,
61         replaces_id = state.cid,
62         destroy = naughty_destroy_callback
63     }).id
64 end
65
66 return { iterate = iterate }