'\"
'\" $Id: tixComboBox.n,v 1.2 2001/01/22 08:02:45 ioilam Exp $
'\"
'\"
'\" Copyright (c) 1993-1999 Ioi Kim Lam.
'\" Copyright (c) 2000-2001 Tix Project Group.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\" 
'\" The file man.macros and some of the macros used by this file are
'\" copyrighted: (c) 1990 The Regents of the University of California.
'\"              (c) 1994-1995 Sun Microsystems, Inc.
'\" The license terms of the Tcl/Tk distribution are in the file
'\" license.tcl.
'\"----------------------------------------------------------------------
.TH TIX 3 4.0 Tix "Tix Built-In Commands"
.BS
'\"
'\"
'\"----------------------------------------------------------------------
.SH NAME
tixComboBox - Create and manipulate tixComboBox widgets
'\"
'\"
'\"
'\"----------------------------------------------------------------------
.SH SYNOPSIS
\fBtixComboBox \fIpathName \fR?\fIoptions\fR?
'\"
'\"
'\"----------------------------------------------------------------------
.SH SUPER-CLASS
The \fBTixComboBox\fR class is derived from the \fBTixLabelWidget\fR
class and inherits all the commands, options and subwidgets
of its super-class.
'\"
'\"----------------------------------------------------------------------
.SH "STANDARD OPTIONS"
'\"
\fBTixComboBox\fR supports all the standard options of a frame widget.
See the options(n) manual entry for details on the standard options.
'\"
'\"
'\"----------------------------------------------------------------------
.PP
.SH "WIDGET-SPECIFIC OPTIONS"
'\"
'\"
'\"
'\"----------BEGIN
.OP \-anchor anchor Anchor
Specifies how the string inside the entry subwidget should be aligned.
Only the values "w" or "e" are allowed. When set the "w", the entry is
aligned to its beginning. When set to "e", it is aligned to its end.
'\"----------END
'\"
'\"----------BEGIN
.OP \-arrowbitmap arrowBitmap ArrowBitmap
Specifies the bitmap to be used in the arrow button beside the entry
widget. The default is an downward arrow bitmap in the file
$tix_library/bitmaps/cbxarrow
'\"----------END
'\"
'\"----------BEGIN
.OP \-browsecmd browseCmd BrowseCmd
Specifies the command to be called when the user browses through the
listbox. This command can be used to provide instant feedback when the
user examines items in the listbox before committing a choice.
'\"----------END
'\"
'\"----------BEGIN
.OP \-command command Command
Specifies the command to be called when the ComboBox is invoked
or when the \fB\-value\fR of the ComboBox is changed.
'\"----------END
'\"
'\"----------BEGIN
.OP \-crossbitmap crossBitmap CrossBitmap
Specifies the bitmap to be used in the "cross" button to the left of
the entry widget. The default is a bitmap in the file
$tix_library/bitmaps/cross
'\"
'\"----------END
'\"
'\"----------BEGIN
.OP \-disablecallback disableCallback DisableCallback
A boolean value indicating whether callbacks should be disabled. When
set to true, the TCL command specified by the \fB\-command\fR option
is not executed when the \fB\-value\fR of the ComboBox.
changes.
'\"----------END
'\"
'\"----------BEGIN
.OP \-disabledforeground disabledforeground DisabledForeground
Specifies the foreground color to be used when the ComboBox is disabled.
'\"----------END
'\"
'\"----------BEGIN
.OP \-dropdown dropdown Dropdown
A Boolean value specifying the style of the ComboBox. When set to
"true", the listbox is only displayed temporarily when the arrow
button is pressed. When set to "false", the listbox is always
displayed.
'\"
'\"----------END
'\"
'\"----------BEGIN
.OP \-editable editable Editable
Specifies whether the user is allowed to type into the entry subwidget of
the ComboBox.
'\"----------END
'\"
'\"----------BEGIN
.OP \-fancy fancy Fancy
A Boolean value specifying whether the cross and tick button
subwidgets should be shown.
'\"----------END
'\"
'\"
'\"----------BEGIN
.OP \-grab grab Grab
Specifies the pointer grabbing policy when the listbox is popped up.
Only values "global", "local" or "none" are allowed. By default global
grab is used. However, when you are developing your application, you
may want to use only local grabbing so that in the event of errors,
your X display won't be locked up.
'\"----------END
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBhistoryLimit\fR
Class:		\fBhistoryLimit\fR
Switch:		\fB\-historylimit\fR
Alias:		\fB\-histlimit\fR
.fi
.IP
Specifies how many previous user inputs can be stored in the history
list.
'\"----------END
'\"
'\"----------BEGIN
.OP \-history history History
A Boolean value specifying whether previous user inputs should be
stored in the history list.
'\"
'\"----------END
'\"
'\"----------BEGIN
.OP \-label label Label
Specifies the string to display as the label of this ComboBox widget.
'\"----------END
'\"
'\"----------BEGIN
.OP \-labelside labelSide LabelSide
Specifies where the label should be displayed relative to the entry
subwidget. Valid options are: \fBtop\fR, \fBleft\fR, \fBright\fR,
\fBbottom\fR, \fBnone\fR or \fBacrosstop\fR.
'\"----------END
'\"'
'\"----------BEGIN
.OP \-listcmd listCmd listCmd
Specifies a TCL command to be called every time when the listbox pops
up. This option allows you to fill up the listbox on-demand. This
option is ignored when the listbox is not in the \fBdropdown\fR style.
'\"----------END
'\"
'\"----------BEGIN
.OP \-listwidth listWidth listWidth
If set, this option controls the width of the listbox subwidget when
it is popped up. The option is ignored when the listbox is not in the
\fBdropdown\fR style.
'\"----------END
'\"
'\"----------BEGIN
.OP \-prunehistory prunehistory PruneHistory
Specifies whether duplicated previous user inputs should be pruned
from the the history list. Only Boolean values are allowed.
'\"----------END
'\"
'\"----------BEGIN
.OP \-selection selection Selection
Contains the selection in the ComboBox (the string displayed in the
entry subwidget). Depending on the \fB\-selectmode\fR, the selection
of a ComboBox may be different than its \fB\-value\fR.
'\"----------END
'\"
'\"----------BEGIN
.OP \-selection selection Selection
This option stores the temporary selection. When the user types in a
text string inside the entry widget, that string is considered as a
temporary input and is stored inside the \fB\-selection\fR option. The
\fB\-value\fR option is updated only when the user presses the return
key.
'\"
'\"----------BEGIN
.OP \-selectmode selectMode SelectMode
Specifies the how the combobox responds to the mouse button events in
the listbox subwidget; can eithet be \fB"browse"\fR or
\fB"immediate"\fR. The default \fB\-selectmode\fR is "browse". See the
\fBBINDINGS\fR section below.
'\"----------END
'\"----------BEGIN
.OP \-state state State
Specifies the whether the ComboBox is normal or disabled.
Only the values "normal" and "disabled" are recognized.
'\"----------END
'\"
'\"----------BEGIN
.OP \-tickbitmap tickBitmap tickBitmap
Specifies the bitmap to be used in the "tick" button to the left of
the entry widget. The default is a bitmap in the file
$tix_library/bitmaps/tick
'\"----------END
'\"
'\"----------BEGIN
.OP \-validatecmd validateCmd ValidateCmd
Specifies a TCL command to be called when the \fB\-value\fR of the
ComboBox is about to change. This command is called with one parameter
-- the new \fB\-value\fR entered by the user. This command is to
validate this new value by returning a value it deems valid.
'\"----------END
'\"
'\"----------BEGIN
.OP \-value value Value
Specifies the string to be displayed in the entry subwidget of the
ComboBox. When queried, the returned value is the last value
selected by the user. When the \fB\-value\fR option is changed as a
result of the \fBconfig -value\fR widget command, the TCL command
specified by the \fB\-command\fR option is called.
'\"----------END
'\"
'\"
'\"
'\"----------BEGIN
.OP \-variable variable Variable
Specifies the global variable in which the value of the
ComboBox should be stored. The value of the ComboBox
will be automatically updated when this variable is changed.
'\"
'\"----------END
'\"
'\"----------------------------------------------------------------------
.SH SUBWIDGETS
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBarrow\fR
Class:		\fBButton\fR
.fi
.IP
The down arrow button.
'\"----------END
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBcross\fR
Class:		\fBButton\fR
.fi
.IP
The cross button. Available only when \fB\-fancy\fR is set.
'\"----------END
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBentry\fR
Class:		\fBEntry\fR
.fi
.IP
The entry that shows the value of this \fBtixControl\fR.
'\"----------END
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBlabel\fR
Class:		\fBLabel\fR
.fi
.IP
The label subwidget.
'\"----------END
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBlistbox\fR
Class:		\fBListbox\fR
.fi
.IP
The listbox that holds all the list entries.
'\"----------END
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBslistbox\fR
Class:		\fBTixScrolledListBox\fR
.fi
.IP
The scrolled-listbox that provides the scrollbars.
'\"----------END
'\"
'\"----------BEGIN
.LP
.nf
Name:		\fBtick\fR
Class:		\fBButton\fR
.fi
.IP
The tick button. Available only when \fB\-fancy\fR is set.
'\"----------END
'\"
.BE
'\"
'\"
'\"----------------------------------------------------------------------
.SH DESCRIPTION
'\"
.PP
'\"
The \fBtixComboBox\fR command creates a new window (given by the
\fIpathName\fR argument) and makes it into a \fBtixComboBox\fR widget.
Additional options, described above, may be specified on the command
line or in the option database to configure aspects of the
ComboBox such as its cursor and relief.

The Tix ComboBox widget is similar to the combo box control in
MS Windows. The user can select a choice by either typing in the entry
subwdget or selecting from the listbox subwidget.
'\"
'\"----------------------------------------------------------------------
.SH WIDGET COMMANDS
.PP
'\"
The \fBtixComboBox\fR command creates a new Tcl command whose name is the
same as the path name of the ComboBox's window.  This command
may be used to invoke various operations on the widget. It has the
following general form:
'\"
.RS
.CS
'\"
\fIpathName option \fR?\fIarg arg ...\fR?
.CE
.RE
'\"
\fIPathName\fR is the name of the command, which is the same as the
ComboBox widget's path name. \fIOption\fR and the \fIarg\fRs
determine the exact behavior of the command.  The following commands
are possible for ComboBox widgets:
'\"
.TP
\fIpathName \fBaddhistory\fI string \fR
'\"
Add the string to the beinning of the listbox.
'\"
.TP
\fIpathName \fBappendhistory\fI string \fR
Append the string to the end of the listbox.
'\"
.TP
\fIpathName \fBcget\fR \fIoption\fR
Returns the current value of the configuration option given by
\fIoption\fR.  \fIOption\fR may have any of the values accepted by the
\fBtixComboBox\fR command.
'\"
.TP
\fIpathName \fBconfigure\fR ?\fIoption\fR? \fI?value option value ...\fR?
'\"
Query or modify the configuration options of the widget.  If no
\fIoption\fR is specified, returns a list describing all of the
available options for \fIpathName\fR (see \fBTk_ConfigureInfo\fR for
information on the format of this list).  If \fIoption\fR is specified
with no \fIvalue\fR, then the command returns a list describing the
one named option (this list will be identical to the corresponding
sublist of the value returned if no \fIoption\fR is specified).  If
one or more \fIoption\-value\fR pairs are specified, then the command
modifies the given widget option(s) to have the given value(s); in
this case the command returns an empty string.  \fIOption\fR may have
any of the values accepted by the \fBtixComboBox\fR command.
'\"
'\"
.TP
\fIpathName \fBflash \fIindex string\fR
'\"
Flashes the ComboBox. \fBflash\fR is usually called by a
\fI\-command\fR procedure to acknowledge to the user that he has
selected a value for the ComboBox.
'\"
'\"
.TP
\fIpathName \fBinsert \fIindex string\fR
Insert the \fI string\fR into the listbox at the specified index.
\fIindex\fR must be a valid listbox index.
'\"
'\"
.TP
\fIpathName \fBpick \fIindex\fR 
Set the (\fIindex\fR)th item in the listbox to be the current value of
the ComboBox. As a result, the \fIvalue\fR of the ComboBox is changed
and the TCL command specified by the \fI\-command\fR option will be
called.
'\"
.TP
\fIpathName \fBsubwidget \fI name ?args?\fR 
When no options are given, returns the pathname of the subwidget of
the specified name.

When options are given, the widget command of the specified subwidget will
be called with these options.
'\"
'\"
'\"
'\"----------------------------------------------------------------------
.PP
.SH BINDINGS
.PP
.IP [1]
If the \fB\-selectmode\fR is "immediate", when the user enters a
keystroke, clicks on an item or drags the mouse pointer in the
listbox, the \fB\-value\fR of the ComboBox will be immediately set to
this item and the \fB\-command\fR procedure will be called.
'\"
'\"
.IP [2]
If the \fB\-selectmode\fR is "browse", when the user enters a
keystroke, clicks on an item or drags the mouse pointer in the
listbox, the \fB\-selection\fR of the ComboBox will be immediately set
to the new content of the entry subwidget; also the \fB\-browsecmd\fR
procedure will be called. The \fB\-value\fR option will be changed
only when the user invokes the ComboBox (see [3] below). If the user
presses the <Escape> key at any time, any new \fB\-selection\fR will
be ignored and the text inside the entry subwidget will be restored to
the current \fB\-value\fR of the ComboBox.
'\"
.IP [3]
If the \fB\-dropdown\fR option is true, the user can invoke the
ComboBox by releasing the left mouse button over the desired item in
the listbox. If the \fB\-dropdown\fR option is false, the user can
invoke the ComboBox by double-clicking over the desired item in the
listbox. In both cases, the user can also invoke the listbox by
pressing the <Return> or <Tab> key inside the entry subwidget, or
switching the input focus to another widget inside the same toplevel
widget
'\"
'\"
'\"----------------------------------------------------------------------
.PP
.SH BUGS
.PP
Starting from Tix vetsion 4.0, the default \fB\-value\fR of the
ComboBox is the empty string. If you want the ComboBox to show a
string by default, you must configure its \fB\-value\fR option
explicitly.
'\"
'\"----------------------------------------------------------------------
.PP
.SH KEYWORDS
Tix(n), ComboBox(n), listbox(n)