active-canvas

This is a get/set parameter function for the active canvas in a frame.

• (send a-mred:connections-dialog-box active-canvas) -> a mred:connections-media-canvas% object or #f

  This returns the most recently active canvas in the frame if there is one, or if no canvas has even been active, it returns #f

  
  

• (send a-mred:connections-dialog-box active-canvas new-active-canvas) -> void
      new-active-canvas : a mred:connections-media-canvas% object.

  This tells the frame that the currently active canvas is new-active-canvas.