on-event

Called to handle mouse events on the snip when this snip can handle events and when the snip has the keyboard focus. See on-char for information about the arguments. See also 'handles-events in get-flags.

• (send a-snip on-event dc x y editorx editory event) -> void
      dc : dc<%> object
      x : real number
      y : real number
      editorx : real number
      editory : real number
      event : mouse-event% object

  The x and y arguments are the snip's location in display coordiantes. The editorx and editory arguments are the snip's location in editor coordinates. To get event's x location in snip coordinates, subtract x from (send event get-x).