Class: EditorCore::History

Inherits:
Object
  • Object
show all
Defined in:
lib/editor_core/history.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ History

Returns a new instance of History.



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# File 'lib/editor_core/history.rb', line 4

def initialize
  @snapshots = []
  @current = -1
end

Instance Method Details

#can_redo? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/editor_core/history.rb', line 22

def can_redo?
  !redo_snapshot.nil?
end

#can_undo? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/editor_core/history.rb', line 14

def can_undo?
  !undo_snapshot.nil?
end

#redo ⇒ Object 



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# File 'lib/editor_core/history.rb', line 26

def redo
  redo_snapshot.tap { @current += 1 }
end

#save(data, advance = true) ⇒ Object 



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# File 'lib/editor_core/history.rb', line 9

def save(data, advance = true)
  snapshots[@current+1] = data
  @current += 1 if advance
end

#undo ⇒ Object 



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# File 'lib/editor_core/history.rb', line 18

def undo
  undo_snapshot.tap { @current -= 1 }
end

#undo_snapshot ⇒ Object 



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# File 'lib/editor_core/history.rb', line 30

def undo_snapshot
  snapshots[current] if current >= 0
end