Class: Yatte::UndoStack

Inherits:
Object
  • Object
show all
Defined in:
lib/yatte/undo.rb

Defined Under Namespace

Classes: Action

Instance Method Summary collapse

Constructor Details

#initialize ⇒ UndoStack

Returns a new instance of UndoStack.



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# File 'lib/yatte/undo.rb', line 7

def initialize
  @undo = []
  @redo = []
end

Instance Method Details

#can_redo? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/yatte/undo.rb', line 40

def can_redo?
  !@redo.empty?
end

#can_undo? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/yatte/undo.rb', line 36

def can_undo?
  !@undo.empty?
end

#push(type:, row:, col:, text:, cursor_row:, cursor_col:) ⇒ Object 



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# File 'lib/yatte/undo.rb', line 12

def push(type:, row:, col:, text:, cursor_row:, cursor_col:)
  @redo.clear
  @undo.push(Action.new(
    type: type, row: row, col: col, text: text,
    cursor_row: cursor_row, cursor_col: cursor_col
  ))
end

#redo ⇒ Object 



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# File 'lib/yatte/undo.rb', line 28

def redo
  return nil if @redo.empty?

  action = @redo.pop
  @undo.push(action)
  action
end

#undo ⇒ Object 



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# File 'lib/yatte/undo.rb', line 20

def undo
  return nil if @undo.empty?

  action = @undo.pop
  @redo.push(action)
  action
end