https://github.com/iomodo/a-simple-undo-redo

A simple undo/redo functionality in Go
https://github.com/iomodo/a-simple-undo-redo

go golang undo undo-redo

Last synced: 3 months ago
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A simple undo/redo functionality in Go

• Host: GitHub
• URL: https://github.com/iomodo/a-simple-undo-redo
• Owner: iomodo
• License: mit
• Created: 2019-05-26T19:43:34.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2019-05-26T20:22:41.000Z (almost 7 years ago)
• Last Synced: 2024-06-20T00:42:28.249Z (almost 2 years ago)
• Topics: go, golang, undo, undo-redo
• Language: Go
• Size: 3.91 KB
• Stars: 2
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# a-simple-undo-redo

A simple undo/redo functionality in Go

## Interface

~~~Go

type State interface{}

type Undoer interface {

    State() State // returns the current state

    Save(newState State) // saves the new state onto the history

    Undo() // undos the state

    Redo() // redos the state

    Clear() // clears the history

}

~~~

## Example

~~~Go

// create undoer with unlimited capacity

undoer := NewUndoer(0)

undoer.Save(1)

undoer.Save(2)

undoer.Save(3)

undoer.Undo()

undoer.Undo()

undoer.State() // returns 1

undoer.Redo()

undoer.State() // returns 2

~~~