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POPUP(2)							      POPUP(2)

NAME
       Popup:  mkbutton, changebutton, event, add - popup list box pseudo-wid‐
       get

SYNOPSIS
       include "popup.m";
       popup := load Popup Popup->PATH;

       init:	     fn();
       mkbutton:     fn(win: ref Tk->Toplevel, name: string,
			items: array of string, n: int): chan of string;
       changebutton: fn(win: ref Tk->Toplevel, name: string,
			items: array of string, n: int);
       event:	     fn(win: ref Tk->Toplevel, e: string,
			items: array of string): int;
       add:	     fn(items: array of string, s: string):
			(array of string, int);

DESCRIPTION
       Popup implements popup list boxes as Tk	pseudo-widgets.	  This	module
       has  since been superseded by choicebutton(2) in Tk itself, but remains
       for the moment for compatibility.

       Init must be called once to initialise the module.

       Mkbutton creates a new button name, in Tk toplevel win.	It  returns  a
       channel	on which it delivers events (see event, below).	 Once created,
       name can be packed like any  other  Tk  widget.	 When  the  button  is
       pressed	with button 1, a menu pops up offering a choice from the given
       items.  The value n is the index	 in  items  of	the  button's  initial
       value.  The current choice is always displayed in the button.  If items
       is nil or an empty array, the string `-----' is displayed instead.

       Having created a popup button, the application must receive  values  on
       the  channel  returned  by  mkbutton and pass each value it receives to
       event (as parameter e).	(Typically the application will receive on the
       channel	in  an	alt statement that watches other channels too.)	 Event
       returns the result of a selection, or -1 if no selection was made.   In
       either  case,  the  text	 of the button name will reflect the currently
       active selection (the application can  fetch  it	 using	`cget -text').
       The items parameter must match that given to mkbutton (or most recently
       given to changebutton).

       Changebutton changes the list of items  in  an  existing	 popup	button
       name, and sets its initial selection to the item with index n.

       Add  adds  string s to the array items, if it is not already there, and
       in either case returns the resulting new	 array	and  the  index	 of  s
       therein.	 It is useful for calculating a list of items dynamically.

SOURCE
       /appl/lib/popup.b

SEE ALSO
       tabs(2), tk(2)

								      POPUP(2)
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