Choice Interaction (XForms (Forms Library) - Version 1.2 (Rev. 4) A Graphical User Interface Toolkit for X)

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#### 23.1.3 Choice Interaction

Beside simply opening up the popup behind the choice object and selecting an entry with the left mouse button you can also use the middle and right mouse buttons and the scroll wheel: a short click with the middle mouse button selects the entry before the currently selected one, a click with the right mouse button the next. Keeping the middle or right mouse button pressed down slowly cycles trough the entries, backward or forward. The same can be down with the sroll wheel.

In both cases, whenever a choice entry is selected (even when it is the original one) the object is returned to the application program. But you can control the condition under which the choice object gets returned to the application by using the function

    int fl_set_object_return(FL_OBJECT *obj, unsigned int when)

where `when` can have the following values

`FL_RETURN_NONE`

  Never return or invoke callback.

`FL_RETURN_END_CHANGED`

  Return or invoke callback if end of interaction and selection of an item coincide.

`FL_RETURN_CHANGED`

  Return or invoke callback whenever an item is selected (this is the default).

`FL_RETURN_END`

  Return or invoke callback on end of an interaction.

`FL_RETURN_ALWAYS`

  Return (or invoke callback) whenever the interaction ends and/or an item is selected.