path: root/doc/ttk_combobox.n

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'\" Copyright (c) 2004 Joe English
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.TH ttk::combobox n 8.5 Tk "Tk Themed Widget"
.so man.macros
.BS
.SH NAME
ttk::combobox \- text field with popdown selection list
.SH SYNOPSIS
\fBttk::combobox\fI pathName \fR?\fIoptions\fR?
.BE
.SH DESCRIPTION
.PP
A \fBttk::combobox\fR combines a text field with a pop-down list of values;
the user may select the value of the text field from among the
values in the list.
.SO ttk_widget
\-class	\-cursor	\-takefocus
\-style	\-placeholder	\-placeholderforeground
.SE
.\" ALSO: Other entry widget options
.SH "WIDGET-SPECIFIC OPTIONS"
.OP \-exportselection exportSelection ExportSelection
Boolean value.
If set, the widget selection is linked to the X selection.
.OP \-justify justify Justify
Specifies how the text is aligned within the widget.
Must be one of \fBleft\fR, \fBcenter\fR, or \fBright\fR.
.OP \-height height Height
Specifies the height of the pop-down listbox, in rows.
.OP \-postcommand postCommand PostCommand
A Tcl script to evaluate immediately before displaying the listbox.
The \fB\-postcommand\fR script may specify the \fB\-values\fR to display.
.OP \-state state State
One of \fBnormal\fR, \fBreadonly\fR, or \fBdisabled\fR.
In the \fBreadonly\fR state,
the value may not be edited directly, and
the user can only select one of the \fB\-values\fR from the
dropdown list.
In the \fBnormal\fR state,
the text field is directly editable.
In the \fBdisabled\fR state, no interaction is possible.
.OP \-textvariable textVariable TextVariable
Specifies the name of a global variable whose value is linked
to the widget value.
Whenever the variable changes value the widget value is updated,
and vice versa.
.OP \-values values Values
Specifies the list of values to display in the drop-down listbox.
.OP \-width width Width
Specifies an integer value indicating the desired width of the entry window,
in average-size characters of the widget's font.
.SH "WIDGET COMMAND"
.PP
In addition to the standard
\fBcget\fR, \fBconfigure\fR, \fBidentify element\fR, \fBinstate\fR,
\fBstate\fR and \fBstyle\fR
commands (see \fBttk::widget\fR),
combobox widgets support the following additional commands:
.\" METHOD: current
.TP
\fIpathName \fBcurrent\fR ?\fInewIndex\fR?
.
If \fInewIndex\fR is supplied, sets the combobox value
to the element at position \fInewIndex\fR in the list of \fB\-values\fR
(in addition to integers, the \fBend\fR index is supported and indicates
the last element of the list, moreover the same simple interpretation as
for the command \fBstring index\fR is supported, with simple integer index
arithmetic and indexing relative to \fBend\fR).
Otherwise, returns the index of the current value in the list of
\fB\-values\fR or \fB{}\fR if the current value does not appear in the list.
.\" METHOD: get
.TP
\fIpathName \fBget\fR
.
Returns the current value of the combobox.
.\" METHOD: set
.TP
\fIpathName \fBset\fI value\fR
.
Sets the value of the combobox to \fIvalue\fR.
.PP
The combobox widget also supports the following \fBttk::entry\fR
widget commands:
.DS
.ta 5.5c 11c
\fBbbox\fR	\fBdelete\fR	\fBicursor\fR
\fBindex\fR	\fBinsert\fR	\fBselection\fR
\fBxview\fR
.DE
.SH "VIRTUAL EVENTS"
.PP
The combobox widget generates a \fB<<ComboboxSelected>>\fR virtual event
when the user selects an element from the list of values.
If the selection action unposts the listbox,
this event is delivered after the listbox is unposted.
.SH "STYLING OPTIONS"
.PP
The class name for a \fBttk::combobox\fP is \fBTCombobox\fP.
The \fBttk::combobox\fP uses the \fBentry\fP and
\fBlistbox\fP widgets internally.
The listbox frame has a class name of \fBComboboxPopdownFrame\fP.
.PP
Dynamic states: \fBdisabled\fP, \fBfocus\fP, \fBpressed\fP, \fBreadonly\fP.
.PP
\fBTCombobox\fP styling options configurable with \fBttk::style\fP
are:
.PP
\fB\-arrowcolor\fP \fIcolor\fP
.br
\fB\-arrowsize\fP \fIamount\fP
.br
\fB\-background\fP \fIcolor\fP
.br
\fB\-bordercolor\fP \fIcolor\fP
.br
\fB\-darkcolor\fP \fIcolor\fP
.br
\fB\-focusfill\fP \fIcolor\fP
.br
\fB\-foreground\fP \fIcolor\fP
.br
\fB\-fieldbackground\fP \fIcolor\fP
.RS
Can only be changed when using non-native and non-graphical themes.
.RE
\fB\-insertcolor\fP \fIcolor\fP
.br
\fB\-insertwidth\fP \fIamount\fP
.br
\fB\-lightcolor\fP \fIcolor\fP
.br
\fB\-padding\fP \fIpadding\fP
.br
\fB\-placeholderforeground\fP \fIcolor\fP
.br
\fB\-postoffset\fP \fIpadding\fP
.br
\fB\-selectbackground\fP \fIcolor\fP
.RS
Text entry select background.
.RE
\fB\-selectforeground\fP \fIcolor\fP
.RS
Text entry select foreground.
.RE
.PP
The \fBttk::combobox\fP popdown listbox cannot be configured using
\fBttk::style\fP nor via the widget \fBconfigure\fP command.  The listbox
can be configured using the option database.
.PP
option add *TCombobox*Listbox.background \fIcolor\fP
.br
option add *TCombobox*Listbox.font \fIfont\fP
.br
option add *TCombobox*Listbox.foreground \fIcolor\fP
.br
option add *TCombobox*Listbox.selectBackground \fIcolor\fP
.br
option add *TCombobox*Listbox.selectForeground \fIcolor\fP
.PP
To configure a specific listbox (subject to future change):
.CS
set popdown [ttk::combobox::PopdownWindow .mycombobox]
$popdown.f.l configure \-font \fIfont\fP
.CE
.PP
\fBComboboxPopdownFrame\fP
styling options configurable with \fBttk::style\fP
are:
.PP
\fB\-borderwidth\fP \fIamount\fP
.br
\fB\-relief\fP \fIrelief\fP
.PP
Some options are only available for specific themes.
.PP
See the \fBttk::style\fP manual page for information on how to configure
ttk styles.
.SH "SEE ALSO"
ttk::widget(n), ttk::entry(n)
.SH KEYWORDS
choice, entry, list box, text box, widget
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