84 lines
2.2 KiB
Lua
84 lines
2.2 KiB
Lua
local core = require "core"
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local ime = { }
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function ime.reset()
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ime.editing = false
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end
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---Convert from utf-8 offset and length (from SDL) to byte offsets
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---@param text string @Textediting string
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---@param start integer @0-based utf-8 offset of the starting position of the selection
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---@param length integer @Size of the utf-8 length of the selection
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function ime.ingest(text, start, length)
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if #text == 0 then
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-- finished textediting
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ime.reset()
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return "", 0, 0
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end
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ime.editing = true
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if start < 0 then
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-- we assume no selection and caret at the end
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return text, #text, 0
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end
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-- start is 0-based, so we use start + 1
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local start_byte = utf8.offset(text, start + 1)
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if not start_byte then
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-- bad start offset
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-- we assume it meant the last byte of the text
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start_byte = #text
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else
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start_byte = math.min(start_byte - 1, #text)
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end
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if length < 0 then
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-- caret only
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return text, start_byte, 0
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end
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local end_byte = utf8.offset(text, start + length + 1)
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if not end_byte or end_byte - 1 < start_byte then
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-- bad length, assume caret only
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return text, start_byte, 0
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end
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end_byte = math.min(end_byte - 1, #text)
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return text, start_byte, end_byte - start_byte
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end
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---Forward the given textediting SDL event data to Views.
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---@param text string @Textediting string
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---@param start integer @0-based utf-8 offset of the starting position of the selection
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---@param length integer @Size of the utf-8 length of the selection
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function ime.on_text_editing(text, start, length, ...)
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if ime.editing or #text > 0 then
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core.root_view:on_ime_text_editing(ime.ingest(text, start, length, ...))
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end
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end
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---Stop IME composition.
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---Might not completely work on every platform.
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function ime.stop()
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if ime.editing then
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-- SDL_ClearComposition for now doesn't work everywhere
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system.clear_ime()
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ime.on_text_editing("", 0, 0)
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end
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end
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---Set the bounding box of the text pertaining the IME.
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---The IME will draw its interface based on this info.
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---@param x number
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---@param y number
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---@param w number
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---@param h number
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function ime.set_location(x, y, w, h)
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system.set_text_input_rect(x, y, w, h)
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end
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ime.reset()
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return ime
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