|Specifies how many previous user inputs can be stored in the history list. A Boolean value specifying whether previous user inputs should be stored in the history list. Specifies the string to display as the label of this ComboBox widget. Specifies where the label should be displayed relative to the entry subwidget. Valid options are: top, left, right, bottom, none or acrosstop. 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. 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 dropdown style. Specifies whether duplicated previous user inputs should be pruned from the the history list. Only Boolean values are allowed. 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. 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. Specifies the how the combobox responds to the mouse button events in the listbox subwidget; can eithet be "browse" or "immediate". The default -selectmode is "browse". See the BINDINGS section below. Specifies the whether the ComboBox is normal or disabled. Only the values "normal" and "disabled" are recognized. 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 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. 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. 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.|
Name: arrow Class: Button
The down arrow button. Name: cross Class: Button The cross button. Available only when -fancy is set. Name: entry Class: Entry The entry that shows the value of this tixControl. Name: label Class: Label The label subwidget. Name: listbox Class: Listbox The listbox that holds all the list entries. Name: slistbox Class: TixScrolledListBox The scrolled-listbox that provides the scrollbars. Name: tick Class: Button 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 subwidget.
The tixComboBox command creates a new Tcl command whose name is the same as the path name of the ComboBoxs 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 widgets 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 specified, 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 specified 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 acknowledge 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 listbox index. 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 name.
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 procedure 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 explicitly.
Tix(n), ComboBox(n), listbox(n)