def draw(alpha = 0xff, z_index = 0, color = 0xffffff, disabled_color = 0x808080)
      return unless @visible

      color = (alpha << 24) | ((@enabled or @disabled_img) ? color : disabled_color)
      text_color = (alpha << 24) | (@enabled ? @text_color : @disabled_text_color)
      img = ((@enabled or @disabled_img.nil?) ? @img : @disabled_img)
      img.draw @x, @y, z_index, @scale_x, @scale_y, color
      @font.draw_text @text, @text_x, @text_y, z_index, @scale_x, @scale_y, text_color

      if @anchor1 and @anchor2
        selection_color = ((alpha / 2) << 24) | @selection_color
        G.window.draw_quad @nodes[@anchor1], @text_y, selection_color,
                           @nodes[@anchor2] + 1, @text_y, selection_color,
                           @nodes[@anchor2] + 1, @text_y + @font.height * @scale_y, selection_color,
                           @nodes[@anchor1], @text_y + @font.height * @scale_y, selection_color, z_index
      end

      if @cursor_visible
        if @cursor_img
          @cursor_img.draw @nodes[@cur_node] - (@cursor_img.width * @scale_x) / 2, @text_y, z_index, @scale_x, @scale_y
        else
          cursor_color = alpha << 24
          G.window.draw_quad @nodes[@cur_node], @text_y, cursor_color,
                             @nodes[@cur_node] + 1, @text_y, cursor_color,
                             @nodes[@cur_node] + 1, @text_y + @font.height * @scale_y, cursor_color,
                             @nodes[@cur_node], @text_y + @font.height * @scale_y, cursor_color, z_index
        end
      end
    end
def draw(alpha = 0xff, z_index = 0, color = 0xffffff, disabled_color = 0x808080)
      return unless @visible

      color = (alpha << 24) | ((@enabled or @disabled_img) ? color : disabled_color)
      text_color = (alpha << 24) | (@enabled ? @text_color : @disabled_text_color)
      img = ((@enabled or @disabled_img.nil?) ? @img : @disabled_img)
      img.draw @x, @y, z_index, @scale_x, @scale_y, color
      @font.draw_text @text, @text_x, @text_y, z_index, @scale_x, @scale_y, text_color

      if @anchor1 and @anchor2
        selection_color = ((alpha / 2) << 24) | @selection_color
        G.window.draw_quad @nodes[@anchor1], @text_y, selection_color,
                           @nodes[@anchor2] + 1, @text_y, selection_color,
                           @nodes[@anchor2] + 1, @text_y + @font.height * @scale_y, selection_color,
                           @nodes[@anchor1], @text_y + @font.height * @scale_y, selection_color, z_index
      end

      if @cursor_visible
        if @cursor_img
          @cursor_img.draw @nodes[@cur_node] - (@cursor_img.width * @scale_x) / 2, @text_y, z_index, @scale_x, @scale_y
        else
          cursor_color = alpha << 24
          G.window.draw_quad @nodes[@cur_node], @text_y, cursor_color,
                             @nodes[@cur_node] + 1, @text_y, cursor_color,
                             @nodes[@cur_node] + 1, @text_y + @font.height * @scale_y, cursor_color,
                             @nodes[@cur_node], @text_y + @font.height * @scale_y, cursor_color, z_index
        end
      end
    end
Draws the text field in the screen.

 Parameters:
 [alpha] The opacity with which the text field will be drawn. Allowed
         values vary between 0 (fully transparent) and 255 (fully opaque).
 [z_index] The z-order to draw the object. Objects with larger z-orders
           will be drawn on top of the ones with smaller z-orders.
 [color] Color to apply a filter to the image.
 [disabled_color] Color to apply a filter to the image when the field is
                  disabled.