Module: VER::Methods::Undo

Defined in:

lib/ver/methods/undo.rb

Overview

Handles most operations on Text that concern undo/redo.

See Also:

• Undo

Class Method Summary

• .record(buffer) {|proxy| ... } ⇒ Object

  Wrapper to record multiple changes to given buffer as one change, so they can be undone and redone together.

• .redo(buffer, count = buffer.prefix_count) ⇒ Object

  Redo count changes made in the given buffer.

• .separator(buffer) ⇒ Object

  Insert a separator into the undo history, undo/redo apply always up to the next separator.

• .undo(buffer, count = buffer.prefix_count) ⇒ Object

  Undo count changes made in the given buffer.

Class Method Details

.record(buffer) {|proxy| ... } ⇒ Object

Wrapper to record multiple changes to given buffer as one change, so they can be undone and redone together. A user usually expects one command to correspond to one undo record, except for things like replacement or input. So use this wrapper when you do more than one modification inside your command.

Yield Parameters:

• proxy (VER::Undo::AutoSeparator) —

  for delete/insert/replace methods

# File 'lib/ver/methods/undo.rb', line 28

def record(buffer, &block)
  buffer.undo_record(&block)
end

.redo(buffer, count = buffer.prefix_count) ⇒ Object

Redo count changes made in the given buffer.

# File 'lib/ver/methods/undo.rb', line 10

def redo(buffer, count = buffer.prefix_count)
  count.times{ buffer.redo }
end

.separator(buffer) ⇒ Object

Insert a separator into the undo history, undo/redo apply always up to the next separator. Operates on the undoer of the given buffer.

# File 'lib/ver/methods/undo.rb', line 35

def separator(buffer)
  buffer.undoer.separate!
end

.undo(buffer, count = buffer.prefix_count) ⇒ Object

Undo count changes made in the given buffer

# File 'lib/ver/methods/undo.rb', line 15

def undo(buffer, count = buffer.prefix_count)
  count.times{ buffer.undo }
end