# File gtk/sample/gtk-demo/drawingarea.rb, line 186
    def scribble_button_press_event(widget, event)
      unless @pixmap
        # paranoia check, in case we haven't gotten a configure event
        return false
      end
  
      if event.button == 1
        draw_brush(widget, event.x, event.y)
      end

      # We've handled the event, stop processing
      return true
    end