Edit:undo() method
Undoes the last edit operation on the Edit.
Return value
This function returns no value.Example
local ui = require "ui"
-- create a fixed Window to hold the buttons
local win = ui.Window("Edit:undo() sample", "fixed", 290, 220)
local label = ui.Label(win, "Enter text : ")
local edit = ui.Edit(win, "", label.x + label.width + 8, label.y-4, 150)
local button = ui.Button(win, "Undo", edit.x + edit.width + 8, edit.y)
function button:onClick()
edit:undo()
end
win:show()
-- update user interface
repeat
ui.update()
-- enabled button only if edit.canundo is true
button.enabled = edit.canundo and true or false
until not win.visible