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55 lines
1.5 KiB
Lua
55 lines
1.5 KiB
Lua
--[[
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QRWidget shows a QR code for a given text.
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]]
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local Blitbuffer = require("ffi/blitbuffer")
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local ImageWidget = require("ui/widget/imagewidget")
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local logger = require("logger")
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local qrencode = require("ffi/qrencode")
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local _ = require("gettext")
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local QRWidget = ImageWidget:extend{
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scale_factor = nil,
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text = ""
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-- see ImageWidget for other options.
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}
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function QRWidget:init()
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local text = self.text
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if #text > 2953 then
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local truncated = _("... (truncated...)")
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text = text:sub(1, 2953 - #truncated) .. truncated
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end
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local ok, grid = qrencode.qrcode(text)
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if not ok then
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logger.info("QRWidget: failed to generate QR code.")
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return
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else
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local sq_size
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if self.width then
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if self.height then
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sq_size = math.min(self.width, self.height)/#grid
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else
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sq_size = self.width/#grid
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end
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elseif self.height then
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sq_size = self.height/#grid
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else sq_size = 1
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end
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sq_size = math.floor(sq_size)
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local grid_size = sq_size * #grid
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local bb = Blitbuffer.new(grid_size, grid_size)
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local white = Blitbuffer.COLOR_WHITE
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for x, col in ipairs(grid) do
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for y, lgn in ipairs(col) do
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if lgn < 0 then
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bb:paintRect((x - 1) * sq_size, (y - 1) * sq_size, sq_size, sq_size, white)
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end
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end
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end
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self.image = bb
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end
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end
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return QRWidget
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