1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | import { Command } from '../../ui' class Undo extends Command { getCommandState(params) { let editorSession = params.editorSession return { disabled: !editorSession.canUndo(), active: false } } execute(params) { let editorSession = params.editorSession if (editorSession.canUndo()) { editorSession.undo() return true } return false } } export default Undo |