all files / model/ ChangeHistory.js

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class ChangeHistory {
 
  constructor() {
    // undo list
    this.doneChanges = []
    // redo list
    this.undoneChanges = []
    // last change for accumlation
    this.lastChange = null
  }
 
  canUndo() {
    return this.doneChanges.length > 0
  }
 
  canRedo() {
    return this.undoneChanges.length > 0
  }
 
  push(change) {
    this.doneChanges.push(change)
    this.undoneChanges = []
  }
 
}
 
export default ChangeHistory