class_docstr: Widget containing a ColorBar
  
  Parameters
  ----------
  cmap : str | vispy.color.ColorMap
      Either the name of the ColorMap to be used from the standard
      set of names (refer to `vispy.color.get_colormap`),
      or a custom ColorMap object.
      The ColorMap is used to apply a gradient on the colorbar.
  orientation : {'left', 'right', 'top', 'bottom'}
      The orientation of the colorbar, used for rendering. The
      orientation can be thought of as the position of the label
      relative to the color bar.
  
      When the orientation is 'left' or 'right', the colorbar is
      vertically placed. When it is 'top' or 'bottom', the colorbar is
      horizontally placed. The colorbar automatically resizes when its
      container's dimension changes.
  
          * 'top': the colorbar is horizontal.
            Color is applied from left to right.
            Minimum corresponds to left and maximum to right.
            Label is to the top of the colorbar
  
          * 'bottom': Same as top, except that
            label is to the bottom of the colorbar
  
          * 'left': the colorbar is vertical.
            Color is applied from bottom to top.
            Minimum corresponds to bottom and maximum to top.
            Label is to the left of the colorbar
  
          * 'right': Same as left, except that the
            label is placed to the right of the colorbar
  label : str
      The label that is to be drawn with the colorbar
      that provides information about the colorbar.
  label_color : str | vispy.color.Color
      The color of labels. This can either be a
      str as the color's name or an actual instace of a vipy.color.Color
  clim : tuple (min, max)
      the minimum and maximum values of the data that
      is given to the colorbar. This is used to draw the scale
      on the side of the colorbar.
  border_width : float (in px)
      The width of the border the colormap should have. This measurement
      is given in pixels
  border_color : str | vispy.color.Color
      The color of the border of the colormap. This can either be a
      str as the color's name or an actual instace of a vipy.color.Color
  padding : tuple (major_axis, minor_axis) [0, 1]
      padding with respect to the major and minor axis
  axis_ratio : float
      ratio of minor axis to major axis
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docstr: Resize event handler
  
  Parameters
  ----------
  event : instance of Event
      The event.
docstr_tok: ["Resize","event","handler","Parameters","--","--","--","--","--","event",":","instance","of","Event","The","event","."]
code: def on_resize(self, event):
      """Resize event handler
  
      Parameters
      ----------
      event : instance of Event
          The event.
      """
      self._update_colorbar()
  
imports: import numpy
  from .widget import Widget
  from ...visuals import ColorBarVisual
label_desc: Use image node_id 2 for calling the ColorBarWidget obj's underlying member method code with example usage: obj.on_resize(event) without return types