UIToolbar Subclass to Include Save and Done Buttons

save_cancel_toolbar.rb

class SaveCancelToolbar < UIToolbar
  attr_writer :delegate
  
  def initWithFrame frame, andTitle: title
    super
    items = []

    spacer = UIBarButtonItem.alloc.initWithBarButtonSystemItem(UIBarButtonSystemItemFlexibleSpace, target:nil, action:nil)
    
    @cancel_button = UIBarButtonItem.alloc.initWithBarButtonSystemItem(UIBarButtonSystemItemCancel, target:self, action:'on_cancel:')
    @save_button   = UIBarButtonItem.alloc.initWithBarButtonSystemItem(UIBarButtonSystemItemSave,   target:self, action:'on_save:')
    
    @title_label = UILabel.alloc.initWithFrame([[0.0, 11], [Device.screen.width, 21]])
    @title_label.setFont UIFont.fontWithName("Helvetica-Bold", size:18)
    @title_label.backgroundColor = UIColor.clearColor
    @title_label.setTextColor UIColor.grayColor
    @title_label.text = title
    @title_label.textAlignment = UITextAlignmentCenter

    @title = UIBarButtonItem.alloc.initWithCustomView @title_label

    items << @cancel_button
    items << spacer
    items << @title
    items << spacer
    items << @save_button
    self.setItems items, animated:true
    
    self
  end
  
  def enable_save
    @save_button.enabled = true
  end
  
  def disable_save
    @save_button.enabled = false
  end
  
  def enable_cancel
    @cancel_button.enabled = true
  end
  
  def disable_cancel
    @cancel_button.enabled = false
  end
  
  def on_cancel(sender)
    @delegate.on_cancel(self)
  end
  
  def on_save(sender)
    @delegate.on_save(self)
  end
end