Class: RubyCurses::SimpleUndo

Inherits:
AbstractUndo show all
Defined in:
lib/rbcurse/experimental/widgets/undomanager.rb

Overview

An implementation of AbstractUndo for textarea. Very basic.

Instance Method Summary collapse

Methods inherited from AbstractUndo

#add_edit, #redo, #undo

Constructor Details

#initialize(_source) ⇒ SimpleUndo

Returns a new instance of SimpleUndo.



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# File 'lib/rbcurse/experimental/widgets/undomanager.rb', line 110

def initialize _source
  super
end

Instance Method Details

#perform_redo(act) ⇒ Object

this has to be bound in source



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# File 'lib/rbcurse/experimental/widgets/undomanager.rb', line 153

def perform_redo act
  row = act.row
  col = act.index0
  $log.debug " REDO processing #{act} "
  case act.type
  when :INSERT
    @source.list[row].insert(col, act.text)
  when :DELETE
    row = act.row
    col = act.index0
    howmany = act.index1 - col
    @source.list[row].slice!(col,howmany)
  when :DELETE_LINE
    #$log.debug " UNDO redo got deleteline #{row} "
    #@source.list.delete_at row
    # changed on 2010-05-23 12:21 since was not handling mult delete
    case act.text
    when Array
      act.text.size.times { @source.list.delete_at row }
    when String
      @source.list.delete_at row
    end
  when :INSERT_LINE
    case act.text
    when Array
      index = row
      act.text.each_with_index{|r,i| @source.list.insert index+i, r}
    when String
      @source.list.insert row, act.text
    end
  else
    $log.warn "unhandled change type #{act.type} "
  end
end

#perform_undo(act) ⇒ Object 



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# File 'lib/rbcurse/experimental/widgets/undomanager.rb', line 117

def perform_undo act
  row = act.row
  col = act.index0
  $log.debug " processing #{act} "
  case act.type
  when :INSERT
    howmany = act.index1 - col
    @source.list[row].slice!(col,howmany)
  when :DELETE
    $log.debug " UNDO processing DELETE #{col}, (#{act.text})  "
    @source.list[row].insert(col, act.text.chomp)
  when :DELETE_LINE
    $log.debug " UNDO inside delete-line #{row} "
    #@source.list.insert(row, act.text) # insert a blank line, since one was deleted
    case act.text
    when Array
      index = row
      act.text.each_with_index{|r,i| @source.list.insert index+i, r}
    when String
      @source.list.insert row, act.text
    end
  when :INSERT_LINE
    $log.debug " UNDO inside insert-line #{row} "
    case act.text
    when Array
      act.text.size.times { @source.list.delete_at row }
    when String
      @source.list.delete_at row
    end
  else
    $log.warn "unhandled change type #{act.type} "
  end
  @source.repaint_required true
  @reject_update = false
end

#source(_source) ⇒ Object 



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# File 'lib/rbcurse/experimental/widgets/undomanager.rb', line 113

def source(_source)
  super
  _source.bind(:CHANGE){|eve| add_edit(eve) }
end