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https://github.com/MikaylaFischler/cc-mek-scada.git
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92 lines
2.6 KiB
Lua
92 lines
2.6 KiB
Lua
-- Text Box Graphics Element
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local util = require("scada-common.util")
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local core = require("graphics.core")
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local element = require("graphics.element")
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local ALIGN = core.ALIGN
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---@class textbox_args
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---@field text string text to show
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---@field alignment? ALIGN text alignment, left by default
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---@field anchor? boolean true to use this as an anchor, making it focusable
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---@field parent graphics_element
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---@field id? string element id
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---@field x? integer 1 if omitted
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---@field y? integer auto incremented if omitted
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---@field width? integer parent width if omitted
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---@field height? integer minimum necessary height for wrapped text if omitted
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---@field gframe? graphics_frame frame instead of x/y/width/height
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---@field fg_bg? cpair foreground/background colors
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---@field hidden? boolean true to hide on initial draw
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-- new text box
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---@param args textbox_args
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---@return graphics_element element, element_id id
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local function textbox(args)
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element.assert(type(args.text) == "string", "text is a required field")
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if args.anchor == true then args.can_focus = true end
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-- provide a constraint condition to element creation to prevent an pointlessly tall text box
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---@param frame graphics_frame
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local function constrain(frame)
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local new_height = math.max(1, #util.strwrap(args.text, frame.w))
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if args.height then
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new_height = math.max(frame.h, new_height)
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end
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return frame.w, new_height
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end
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-- create new graphics element base object
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local e = element.new(args, constrain)
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e.value = args.text
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local alignment = args.alignment or ALIGN.LEFT
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-- draw textbox
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function e.redraw()
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e.window.clear()
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local lines = util.strwrap(e.value, e.frame.w)
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for i = 1, #lines do
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if i > e.frame.h then break end
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-- trim leading/trailing whitespace
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lines[i] = util.trim(lines[i])
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local len = string.len(lines[i])
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-- use cursor position to align this line
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if alignment == ALIGN.CENTER then
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e.w_set_cur(math.floor((e.frame.w - len) / 2) + 1, i)
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elseif alignment == ALIGN.RIGHT then
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e.w_set_cur((e.frame.w - len) + 1, i)
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else
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e.w_set_cur(1, i)
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end
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e.w_write(lines[i])
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end
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end
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-- set the string value and re-draw the text
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---@param val string value
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function e.set_value(val)
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e.value = val
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e.redraw()
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end
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-- initial draw
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e.redraw()
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return e.complete()
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end
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return textbox
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