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323 lines
8.4 KiB
Lua
323 lines
8.4 KiB
Lua
require "ui/event"
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-- constants from <linux/input.h>
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EV_KEY = 1
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-- event values
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EVENT_VALUE_KEY_PRESS = 1
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EVENT_VALUE_KEY_REPEAT = 2
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EVENT_VALUE_KEY_RELEASE = 0
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--[[
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an interface for key presses
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]]
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Key = {}
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function Key:new(key, modifiers)
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local o = { key = key, modifiers = modifiers }
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-- we're a hash map, too
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o[key] = true
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for mod, pressed in pairs(modifiers) do
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if pressed then
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o[mod] = true
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end
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end
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setmetatable(o, self)
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self.__index = self
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return o
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end
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function Key:__tostring()
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return table.concat(self:getSequence(), "-")
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end
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--[[
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get a sequence that can be matched against later
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use this to let the user press a sequence and then
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store this as configuration data (configurable
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shortcuts)
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]]
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function Key:getSequence()
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local seq = {}
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for mod, pressed in pairs(self.modifiers) do
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if pressed then
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table.insert(seq, mod)
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end
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end
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table.insert(seq, self.key)
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end
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--[[
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this will match a key against a sequence
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the sequence should be a table of key names that
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must be pressed together to match.
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if an entry in this table is itself a table, at
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least one key in this table must match.
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E.g.:
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Key:match({ "Alt", "K" }) -- match Alt-K
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Key:match({ "Alt", { "K", "L" }}) -- match Alt-K _or_ Alt-L
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]]
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function Key:match(sequence)
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local mod_keys = {} -- a hash table for checked modifiers
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for _, key in ipairs(sequence) do
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if type(key) == "table" then
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local found = false
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for _, variant in ipairs(key) do
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if self[variant] then
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found = true
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break
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end
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end
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if not found then
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-- one of the needed keys is not pressed
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return false
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end
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elseif not self[key] then
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-- needed key not pressed
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return false
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elseif self.modifiers[key] ~= nil then
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-- checked key is a modifier key
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mod_keys[key] = true
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end
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end
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for mod, pressed in pairs(self.modifiers) do
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if pressed and not mod_keys[mod] then
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-- additional modifier keys are pressed, don't match
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return false
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end
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end
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return true
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end
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--[[
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an interface to get input events
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]]
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Input = {
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event_map = {
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[2] = "1", [3] = "2", [4] = "3", [5] = "4", [6] = "5", [7] = "6", [8] = "7", [9] = "8", [10] = "9", [11] = "0",
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[16] = "Q", [17] = "W", [18] = "E", [19] = "R", [20] = "T", [21] = "Y", [22] = "U", [23] = "I", [24] = "O", [25] = "P",
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[30] = "A", [31] = "S", [32] = "D", [33] = "F", [34] = "G", [35] = "H", [36] = "J", [37] = "K", [38] = "L", [14] = "Del",
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[44] = "Z", [45] = "X", [46] = "C", [47] = "V", [48] = "B", [49] = "N", [50] = "M", [52] = ".", [53] = "/", -- only KDX
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[28] = "Enter",
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[42] = "Shift",
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[56] = "Alt",
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[57] = " ",
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[90] = "AA", -- KDX
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[91] = "Back", -- KDX
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[92] = "Press", -- KDX
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[94] = "Sym", -- KDX
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[98] = "Home", -- KDX
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[102] = "Home", -- K[3]
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[104] = "LPgBack", -- K[3] only
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[103] = "Up", -- K[3]
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[105] = "Left",
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[106] = "Right",
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[108] = "Down", -- K[3]
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[109] = "RPgBack",
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[114] = "VMinus",
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[115] = "VPlus",
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[122] = "Up", -- KDX
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[123] = "Down", -- KDX
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[124] = "RPgFwd", -- KDX
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[126] = "Sym", -- K[3]
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[139] = "Menu",
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[158] = "Back", -- K[3]
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[190] = "AA", -- K[3]
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[191] = "RPgFwd", -- K[3]
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[193] = "LPgFwd", -- K[3] only
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[194] = "Press", -- K[3]
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},
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sdl_event_map = {
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[10] = "1", [11] = "2", [12] = "3", [13] = "4", [14] = "5", [15] = "6", [16] = "7", [17] = "8", [18] = "9", [19] = "0",
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[24] = "Q", [25] = "W", [26] = "E", [27] = "R", [28] = "T", [29] = "Y", [30] = "U", [31] = "I", [32] = "O", [33] = "P",
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[38] = "A", [39] = "S", [40] = "D", [41] = "F", [42] = "G", [43] = "H", [44] = "J", [45] = "K", [46] = "L",
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[52] = "Z", [53] = "X", [54] = "C", [55] = "V", [56] = "B", [57] = "N", [58] = "M",
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[22] = "Back", -- Backspace
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[36] = "Enter", -- Enter
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[50] = "Shift", -- left shift
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[60] = ".",
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[61] = "/",
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[62] = "Sym", -- right shift key
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[64] = "Alt", -- left alt
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[65] = " ", -- Spacebar
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[67] = "Menu", -- F[1]
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[72] = "LPgBack", -- F[6]
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[73] = "LPgFwd", -- F[7]
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[95] = "VPlus", -- F[11]
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[96] = "VMinus", -- F[12]
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[105] = "AA", -- right alt key
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[110] = "Home", -- Home
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[111] = "Up", -- arrow up
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[112] = "RPgBack", -- normal PageUp
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[113] = "Left", -- arrow left
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[114] = "Right", -- arrow right
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[115] = "Press", -- End (above arrows)
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[116] = "Down", -- arrow down
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[117] = "RPgFwd", -- normal PageDown
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[119] = "Del", -- Delete
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},
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rotation = 0,
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rotation_map = {
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[0] = {},
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[1] = { Up = "Right", Right = "Down", Down = "Left", Left = "Up" },
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[2] = { Up = "Down", Right = "Left", Down = "Up", Left = "Right" },
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[3] = { Up = "Left", Right = "Up", Down = "Right", Left = "Down" }
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},
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modifiers = {
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Alt = false,
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Shift = false
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},
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-- these groups are just helpers:
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group = {
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Cursor = { "Up", "Down", "Left", "Right" },
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PgFwd = { "RPgFwd", "LPgFwd" },
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PgBack = { "RPgBack", "LPgBack" },
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Alphabet = {
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"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
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"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"
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},
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AlphaNumeric = {
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"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
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"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
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"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"
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},
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Numeric = {
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"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"
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},
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Text = {
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" ", ".", "/",
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"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
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"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
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"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"
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},
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Any = {
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" ", ".", "/",
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"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
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"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
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"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
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"Up", "Down", "Left", "Right", "Press",
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"Back", "Enter", "Sym", "AA", "Menu", "Home", "Del",
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"LPgBack", "RPgBack", "LPgFwd", "RPgFwd"
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}
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}
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}
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function Input:init()
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if util.isEmulated()==1 then
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-- dummy call that will initialize SDL input handling
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input.open("")
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-- SDL key codes
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self.event_map = self.sdl_event_map
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else
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input.open("slider")
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input.open("/dev/input/event0")
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input.open("/dev/input/event1")
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-- check if we are running on Kindle 3 (additional volume input)
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local f=lfs.attributes("/dev/input/event2")
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if f then
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print("Auto-detected Kindle 3")
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input.open("/dev/input/event2")
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end
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end
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end
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function Input:waitEvent(timeout_us, timeout_s)
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-- wrapper for input.waitForEvents that will retry for some cases
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local ok, ev
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while true do
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ok, ev = pcall(input.waitForEvent, timeout_us, timeout_s)
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if ok then
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break
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end
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if ev == "Waiting for input failed: timeout\n" then
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-- don't report an error on timeout
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ev = nil
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break
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end
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debug("got error waiting for events:", ev)
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if ev ~= "Waiting for input failed: 4\n" then
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-- we abort if the error is not EINTR
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break
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end
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end
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if ok and ev then
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if ev.type == EV_KEY then
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local keycode = self.event_map[ev.code]
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if not keycode then
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-- do not handle keypress for keys we don't know
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return
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end
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-- take device rotation into account
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if self.rotation_map[self.rotation][keycode] then
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keycode = self.rotation_map[self.rotation][keycode]
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end
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-- handle modifier keys
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if self.modifiers[keycode] ~= nil then
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if ev.value == EVENT_VALUE_KEY_PRESS then
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self.modifiers[keycode] = true
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elseif ev.value == EVENT_VALUE_KEY_RELEASE then
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self.modifiers[keycode] = false
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end
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return
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end
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local key = Key:new(keycode, self.modifiers)
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if ev.value == EVENT_VALUE_KEY_PRESS then
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return Event:new("KeyPress", key)
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elseif ev.value == EVENT_VALUE_KEY_RELEASE then
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return Event:new("KeyRelease", key)
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end
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else
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-- some other kind of event that we do not know yet
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return Event:new("GenericInput", ev)
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end
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elseif not ok and ev then
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return Event:new("InputError", ev)
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end
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end
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--[[
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helper function for formatting sequence definitions for output
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]]
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function Input:sequenceToString(sequence)
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local modifiers = {}
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local keystring = {"",""} -- first entries reserved for modifier specification
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for _, key in ipairs(sequence) do
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if type(key) == "table" then
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local alternatives = {}
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for _, alternative in ipairs(key) do
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table.insert(alternatives, alternative)
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end
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table.insert(keystring, "{")
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table.insert(keystring, table.concat(alternatives, "|"))
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table.insert(keystring, "}")
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elseif self.modifiers[key] ~= nil then
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table.insert(modifiers, key)
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else
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table.insert(keystring, key)
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end
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end
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if #modifiers then
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keystring[0] = table.concat(modifiers, "-")
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keystring[1] = "-"
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end
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return table.concat(keystring)
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end
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