set-clickback

Installs a clickback for a given region. See also Clickbacks.

• (send a-wx:media-edit set-clickback start end f hilite-delta call-on-down?) -> void
      start : small integer
      end : small integer
      f : a procedure that takes three arguments: a wx:media-edit% object, a starting position small integer, and an eding position small integer
      hilite-delta = null : wx:style-delta% object or null
      call-on-down? = #f : boolean

  The callback procedure f is called when the user selects the clickback. The arguments to f are this buffera and the starting and ending range of the clickback.

  The hilite-delta style delta is applied to the clickback text when the user has clicked and is still holding the mouse over the clickback. If hilite-delta is null, then the clickback region's style is not changed when it is being selected.

  If call-on-down? is not #f, the clickback is called immediately when the user clicks the mouse button down, instead of after a mouse-up event. The hilite-delta argument is not used in this case.