tixComboBox(n) Tix Built-In Commands tixComboBox(n)
tixComboBox - Create and manipulate tixComboBox widgets
tixComboBox pathName ?options?
The TixComboBox class is derived from the TixLabelWidget class and inherits all the com-
mands, options and subwidgets of its super-class.
TixComboBox supports all the standard options of a frame widget. See the options(n) man-
ual entry for details on the standard options.
[-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. [-arrowbitmap arrowBitmap] Speci-
fies 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 [-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. [-command command] Specifies the command to be called when the Com-
boBox is invoked or when the -value of the ComboBox is changed. [-crossbitmap cross-
Bitmap] 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 [-disablecall-
back disableCallback] A boolean value indicating whether callbacks should be disabled.
When set to true, the TCL command specified by the -command option is not executed when
the -value of the ComboBox. changes. [-disabledforeground disabledforeground] Specifies
the foreground color to be used when the ComboBox is disabled. [-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. [-editable editable] Specifies whether the user is allowed
to type into the entry subwidget of the ComboBox. [-fancy fancy] A Boolean value specify-
ing whether the cross and tick button subwidgets should be shown. [-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.
Specifies how many previous user inputs can be stored in the history list. [-his-
tory history] A Boolean value specifying whether previous user inputs should be
stored in the history list. [-label label] Specifies the string to display as the
label of this ComboBox widget. [-labelside labelSide] Specifies where the label
should be displayed relative to the entry subwidget. Valid options are: top, left,
right, bottom, none or acrosstop. [-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 dropdown
style. [-listwidth listWidth] If set, this option controls the width of the list-
box subwidget when it is popped up. The option is ignored when the listbox is not
in the dropdown style. [-prunehistory prunehistory] Specifies whether duplicated
previous user inputs should be pruned from the the history list. Only Boolean val-
ues are allowed. [-selection selection] Contains the selection in the ComboBox
(the string displayed in the entry subwidget). Depending on the -selectmode, the
selection of a ComboBox may be different than its -value. [-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 -selection option. The -value option is updated only when the
user presses the return key. [-selectmode selectMode] Specifies the how the com-
bobox responds to the mouse button events in the listbox subwidget; can eithet be
"browse" or "immediate". The default -selectmode is "browse". See the BINDINGS sec-
tion below. [-state state] Specifies the whether the ComboBox is normal or dis-
abled. Only the values "normal" and "disabled" are recognized. [-tickbitmap tick-
Bitmap] 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 [-vali-
datecmd validateCmd] Specifies a TCL command to be called when the -value of the
ComboBox is about to change. This command is called with one parameter -- the new
-value entered by the user. This command is to validate this new value by returning
a value it deems valid. [-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 -value option is changed as a result of the config
-value widget command, the TCL command specified by the -command option is called.
[-variable variable] Specifies the global variable in which the value of the Com-
boBox should be stored. The value of the ComboBox will be automatically updated
when this variable is changed.
The down arrow button.
The cross button. Available only when -fancy is set.
The entry that shows the value of this tixControl.
The label subwidget.
The listbox that holds all the list entries.
The scrolled-listbox that provides the scrollbars.
The tick button. Available only when -fancy is set.
The tixComboBox command creates a new window (given by the pathName argument) and makes it
into a tixComboBox 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 sub-
The tixComboBox 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:
pathName option ?arg arg ...?
PathName is the name of the command, which is the same as the ComboBox widget's path name.
Option and the args determine the exact behavior of the command. The following commands
are possible for ComboBox widgets:
pathName addhistory string
Add the string to the beinning of the listbox.
pathName appendhistory string
Append the string to the end of the listbox.
pathName cget option
Returns the current value of the configuration option given by option. Option may
have any of the values accepted by the tixComboBox command.
pathName configure ?option? ?value option value ...?
Query or modify the configuration options of the widget. If no option is speci-
fied, returns a list describing all of the available options for pathName (see
Tk_ConfigureInfo for information on the format of this list). If option is speci-
fied with no value, 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 option is specified). If one or more option-value 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. Option may have any of the values
accepted by the tixComboBox command.
pathName flash index string
Flashes the ComboBox. flash is usually called by a -command procedure to acknowl-
edge to the user that he has selected a value for the ComboBox.
pathName insert index string
Insert the string into the listbox at the specified index. index must be a valid
pathName pick index
Set the (index)th item in the listbox to be the current value of the ComboBox. As a
result, the value of the ComboBox is changed and the TCL command sepcified by the
-command option will be called.
pathName subwidget name ?args?
When no options are given, returns the pathname of the subwidget of the specified
When options are given, the widget command of the specified subwidget will be
called with these options.
 If the -selectmode is "immediate", when the user enters a keystroke, clicks on an
item or drags the mouse pointer in the listbox, the -value of the ComboBox will be
immediately set to this item and the -command procedure will be called.
 If the -selectmode is "browse", when the user enters a keystroke, clicks on an item
or drags the mouse pointer in the listbox, the -selection of the ComboBox will be
immediately set to the new content of the entry subwidget; also the -browsecmd pro-
cedure will be called. The -value option will be changed only when the user invokes
the ComboBox (see  below). If the user presses the <Escape> key at any time, any
new -selection will be ignored and the text inside the entry subwidget will be
restored to the current -value of the ComboBox.
 If the -dropdown option is true, the user can invoke the ComboBox by releasing the
left mouse button over the desired item in the listbox. If the -dropdown 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
Starting from Tix vetsion 4.0, the default -value of the ComboBox is the empty string. If
you want the ComboBox to show a string by default, you must configure its -value option
Tix(n), ComboBox(n), listbox(n)
Tix 4.0 tixComboBox(n)