97 lines
2.9 KiB
Lua
97 lines
2.9 KiB
Lua
---------------------------------------------------------------------------
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--- Keygrabber Stack
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--
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-- @author dodo
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-- @copyright 2012 dodo
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-- @module awful.keygrabber
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---------------------------------------------------------------------------
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local ipairs = ipairs
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local table = table
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local capi = {
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keygrabber = keygrabber }
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local keygrabber = {}
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-- Private data
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local grabbers = {}
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local keygrabbing = false
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local function grabber(mod, key, event)
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for _, keygrabber_function in ipairs(grabbers) do
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-- continue if the grabber explicitly returns false
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if keygrabber_function(mod, key, event) ~= false then
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break
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end
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end
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end
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--- Stop grabbing the keyboard for the provided callback.
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-- When no callback is given, the last grabber gets removed (last one added to
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-- the stack).
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-- @param g The key grabber that must be removed.
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function keygrabber.stop(g)
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for i, v in ipairs(grabbers) do
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if v == g then
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table.remove(grabbers, i)
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break
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end
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end
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-- Stop the global key grabber if the last grabber disappears from stack.
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if #grabbers == 0 then
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keygrabbing = false
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capi.keygrabber.stop()
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end
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end
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---
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-- Grab keyboard input and read pressed keys, calling the least callback
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-- function from the stack at each keypress, until the stack is empty.
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--
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-- Calling run with the same callback again will bring the callback
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-- to the top of the stack.
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--
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-- The callback function receives three arguments:
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--
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-- * a table containing modifiers keys
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-- * a string with the pressed key
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-- * a string with either "press" or "release" to indicate the event type
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--
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-- A callback can return `false` to pass the events to the next
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-- keygrabber in the stack.
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-- @param g The key grabber callback that will get the key events until it will be deleted or a new grabber is added.
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-- @return the given callback `g`.
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-- @usage
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-- -- The following function can be bound to a key, and be used to resize a
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-- -- client using the keyboard.
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--
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-- function resize(c)
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-- local grabber = awful.keygrabber.run(function(mod, key, event)
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-- if event == "release" then return end
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--
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-- if key == 'Up' then awful.client.moveresize(0, 0, 0, 5, c)
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-- elseif key == 'Down' then awful.client.moveresize(0, 0, 0, -5, c)
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-- elseif key == 'Right' then awful.client.moveresize(0, 0, 5, 0, c)
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-- elseif key == 'Left' then awful.client.moveresize(0, 0, -5, 0, c)
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-- else awful.keygrabber.stop(grabber)
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-- end
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-- end)
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-- end
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function keygrabber.run(g)
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-- Remove the grabber if it is in the stack.
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keygrabber.stop(g)
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-- Record the grabber that has been added most recently.
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table.insert(grabbers, 1, g)
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-- Start the keygrabber if it is not running already.
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if not keygrabbing then
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keygrabbing = true
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capi.keygrabber.run(grabber)
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end
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return g
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end
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return keygrabber
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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