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This is the undo.js module - basically four methods - done to record the custom undo/redo callbacks, undo and redo to al them and reset to remove all undos/redos (e.g. after loading a new file):

This is the undo.js module - basically four methods - done to record the custom undo/redo callbacks, undo and redo to call them and reset to remove all undos/redos (e.g. after loading a new file):

I've added a delete example - which in my case removes a block - this also need to keep a reference to the original block (object) for undo (and redo). This is bit more complex and has some specifics for my visual editor

I've added a delete example - which in my case removes a block - this also needs to keep a reference to the original block (object) for undo (and redo). This is bit more complex and has some specifics for my visual editor

I hope this helps.

I've added a delete example - which in my case removes a block - this also need to keep a reference to the original block (object) for undo (and redo). This is bit more complex and has some specifics for my visual editor

function removeBlock(elem, parent_node, next_sibling) {
  let id = elem.dataset.quandoId
  let option_parents = []
  if (id) { // Store any references to this option - for undo
    option_parents = _get_parent_options(id)
    _populateLists()
  }
  elem.classList.remove("gu-hide") // To reveal the element if undone later
  let _undo = () => {
    parent_node.insertBefore(elem, next_sibling)
    _populateLists()
    _restore_options(id, option_parents)
  }
  let _redo = () => {
    parent_node.removeChild(elem)
    _populateLists()
  }
  undo.done(_undo, _redo, "Delete Block")
}

I hope this helps.