mirror of
https://github.com/koreader/koreader
synced 2024-11-11 19:11:14 +00:00
3066c86e38
This is a major overhaul of the hardware abstraction layer. A few notes: General platform distinction happens in frontend/device.lua which will delegate everything else to frontend/device/<platform_name>/device.lua which should extend frontend/device/generic/device.lua Screen handling is implemented in frontend/device/screen.lua which includes the *functionality* to support device specifics. Actually setting up the device specific functionality, however, is done in the device specific setup code in the relevant device.lua file. The same goes for input handling.
92 lines
2.1 KiB
Lua
92 lines
2.1 KiB
Lua
--[[
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an interface for key presses
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]]
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local 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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return Key
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