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-'\"
-'\" Copyright (c) 1990 The Regents of the University of California.
-'\" Copyright (c) 1994-1997 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH listbox n 8.4 Tk "Tk Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-listbox \- Create and manipulate 'listbox' item list widgets
-.SH SYNOPSIS
-\fBlistbox\fR \fIpathName \fR?\fIoptions\fR?
-.SO
-\-background	\-borderwidth	\-cursor
-\-disabledforeground	\-exportselection	\-font
-\-foreground	\-highlightbackground	\-highlightcolor
-\-highlightthickness	\-justify	\-relief
-\-selectbackground	\-selectborderwidth	\-selectforeground
-\-setgrid	\-takefocus	\-xscrollcommand
-\-yscrollcommand
-.SE
-.SH "WIDGET-SPECIFIC OPTIONS"
-.OP \-activestyle activeStyle ActiveStyle
-Specifies the style in which to draw the active element.  This must be
-one of \fBdotbox\fR (show a focus ring around the active element),
-\fBnone\fR (no special indication of active element) or
-\fBunderline\fR (underline the active element).
-The default is \fBunderline\fR on Windows, and \fBdotbox\fR elsewhere.
-.OP \-height height Height
-Specifies the desired height for the window, in lines.
-If zero or less, then the desired height for the window is made just
-large enough to hold all the elements in the listbox.
-.OP \-listvariable listVariable Variable
-Specifies the name of a global variable.  The value of the variable is a list to
-be displayed inside the widget; if the variable value changes then the
-widget will automatically update itself to reflect the new value.  Attempts
-to assign a variable with an invalid list value to \fB\-listvariable\fR
-will cause an error.  Attempts to unset a variable in use as a
-\fB\-listvariable\fR will fail but will not generate an error.
-.OP \-selectmode selectMode SelectMode
-Specifies one of several styles for manipulating the selection.
-The value of the option may be arbitrary, but the default bindings
-expect it to be either \fBsingle\fR, \fBbrowse\fR, \fBmultiple\fR,
-or \fBextended\fR;  the default value is \fBbrowse\fR.
-.OP \-state state State
-Specifies one of two states for the listbox:  \fBnormal\fR or \fBdisabled\fR.
-If the listbox is disabled then items may not be inserted or deleted,
-items are drawn in the \fB\-disabledforeground\fR color, and selection
-cannot be modified and is not shown (though selection information is retained).
-.OP \-width width Width
-Specifies the desired width for the window in characters.
-If the font does not have a uniform width then the width of the character
-.QW 0
-is used in translating from character units to screen units.
-If zero or less, then the desired width for the window is made just
-large enough to hold all the elements in the listbox.
-.BE
-.SH DESCRIPTION
-.PP
-The \fBlistbox\fR command creates a new window (given by the
-\fIpathName\fR argument) and makes it into a listbox widget.
-Additional
-options, described above, may be specified on the command line
-or in the option database
-to configure aspects of the listbox such as its colors, font,
-text, and relief.  The \fBlistbox\fR command returns its
-\fIpathName\fR argument.  At the time this command is invoked,
-there must not exist a window named \fIpathName\fR, but
-\fIpathName\fR's parent must exist.
-.PP
-A listbox is a widget that displays a list of strings, one per line.
-When first created, a new listbox has no elements.
-Elements may be added or deleted using widget commands described
-below.  In addition, one or more elements may be selected as described
-below.
-If a listbox is exporting its selection (see \fB\-exportselection\fR
-option), then it will observe the standard X11 protocols
-for handling the selection.
-Listbox selections are available as type \fBSTRING\fR;
-the value of the selection will be the text of the selected elements, with
-newlines separating the elements.
-.PP
-It is not necessary for all the elements to be
-displayed in the listbox window at once;  commands described below
-may be used to change the view in the window.  Listboxes allow
-scrolling in both directions using the standard \fB\-xscrollcommand\fR
-and \fB\-yscrollcommand\fR options.
-They also support scanning, as described below.
-.SH "INDICES"
-.PP
-Many of the widget commands for listboxes take one or more indices
-as arguments.
-An index specifies a particular element of the listbox, in any of
-the following ways:
-.TP 12
-\fInumber\fR
-.
-Specifies the element as a numerical index, where 0 corresponds
-to the first element in the listbox.
-.TP 12
-\fBactive\fR
-.
-Indicates the element that has the location cursor.  This element
-will be displayed as specified by \fB\-activestyle\fR when the listbox
-has the keyboard focus, and it is specified with the \fBactivate\fR
-widget command.
-.TP 12
-\fBanchor\fR
-.
-Indicates the anchor point for the selection, which is set with the
-\fBselection anchor\fR widget command.
-.TP 12
-\fBend\fR
-.
-Indicates the end of the listbox.
-For most commands this refers to the last element in the listbox,
-but for a few commands such as \fBindex\fR and \fBinsert\fR
-it refers to the element just after the last one.
-.TP 12
-\fB@\fIx\fB,\fIy\fR
-Indicates the element that covers the point in the listbox window
-specified by \fIx\fR and \fIy\fR (in pixel coordinates).  If no
-element covers that point, then the closest element to that
-point is used.
-.LP
-In the widget command descriptions below, arguments named \fIindex\fR,
-\fIfirst\fR, and \fIlast\fR always contain text indices in one of
-the above forms.
-.SH "WIDGET COMMAND"
-.PP
-The \fBlistbox\fR command creates a new Tcl command whose
-name is \fIpathName\fR.  This
-command may be used to invoke various
-operations on the widget.  It has the following general form:
-.CS
-\fIpathName option \fR?\fIarg arg ...\fR?
-.CE
-\fIOption\fR and the \fIarg\fRs
-determine the exact behavior of the command.  The following
-commands are possible for listbox widgets:
-.TP
-\fIpathName \fBactivate\fR \fIindex\fR
-.
-Sets the active element to the one indicated by \fIindex\fR.
-If \fIindex\fR is outside the range of elements in the listbox
-then the closest element is activated.
-The active element is drawn as specified by \fB\-activestyle\fR when the
-widget has the input focus, and its index may be retrieved with the
-index \fBactive\fR.
-.TP
-\fIpathName \fBbbox\fR \fIindex\fR
-.
-Returns a list of four numbers describing the bounding box of
-the text in the element given by \fIindex\fR.
-The first two elements of the list give the x and y coordinates
-of the upper-left corner of the screen area covered by the text
-(specified in pixels relative to the widget) and the last two
-elements give the width and height of the area, in pixels.
-If no part of the element given by \fIindex\fR is visible on the
-screen,
-or if \fIindex\fR refers to a non-existent element,
-then the result is an empty string;  if the element is
-partially visible, the result gives the full area of the element,
-including any parts that are not visible.
-.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 \fBlistbox\fR
-command.
-.TP
-\fIpathName \fBconfigure\fR ?\fIoption\fR? ?\fIvalue 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 \fBlistbox\fR
-command.
-.TP
-\fIpathName \fBcurselection\fR
-.
-Returns a list containing the numerical indices of
-all of the elements in the listbox that are currently selected.
-If there are no elements selected in the listbox then an empty
-string is returned.
-.TP
-\fIpathName \fBdelete \fIfirst \fR?\fIlast\fR?
-.
-Deletes one or more elements of the listbox.  \fIFirst\fR and \fIlast\fR
-are indices specifying the first and last elements in the range
-to delete.  If \fIlast\fR is not specified it defaults to
-\fIfirst\fR, i.e. a single element is deleted.
-.TP
-\fIpathName \fBget \fIfirst\fR ?\fIlast\fR?
-.
-If \fIlast\fR is omitted, returns the contents of the listbox
-element indicated by \fIfirst\fR,
-or an empty string if \fIfirst\fR refers to a non-existent element.
-If \fIlast\fR is specified, the command returns a list whose elements
-are all of the listbox elements between \fIfirst\fR and \fIlast\fR,
-inclusive.
-Both \fIfirst\fR and \fIlast\fR may have any of the standard
-forms for indices.
-.TP
-\fIpathName \fBindex \fIindex\fR
-.
-Returns the integer index value that corresponds to \fIindex\fR.
-If \fIindex\fR is \fBend\fR the return value is a count of the number
-of elements in the listbox (not the index of the last element).
-.TP
-\fIpathName \fBinsert \fIindex \fR?\fIelement element ...\fR?
-.
-Inserts zero or more new elements in the list just before the
-element given by \fIindex\fR.  If \fIindex\fR is specified as
-\fBend\fR then the new elements are added to the end of the
-list.  Returns an empty string.
-.TP
-\fIpathName \fBitemcget \fIindex option\fR
-.
-Returns the current value of the item configuration option given
-by \fIoption\fR. \fIOption\fR may have any of the values accepted
-by the \fBitemconfigure\fR command.
-.TP
-\fIpathName \fBitemconfigure \fIindex\fR ?\fIoption\fR? ?\fIvalue\fR? ?\fIoption value ...\fR?
-.
-Query or modify the configuration options of an item in the listbox.
-If no \fIoption\fR is specified, returns a list describing all of
-the available options for the item (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. The following options
-are currently supported for items:
-.RS
-.TP
-\fB\-background \fIcolor\fR
-.
-\fIColor\fR specifies the background color to use when displaying the
-item. It may have any of the forms accepted by \fBTk_GetColor\fR.
-.TP
-\fB\-foreground \fIcolor\fR
-.
-\fIColor\fR specifies the foreground color to use when displaying the
-item. It may have any of the forms accepted by \fBTk_GetColor\fR.
-.TP
-\fB\-selectbackground \fIcolor\fR
-.
-\fIcolor\fR specifies the background color to use when displaying the
-item while it is selected. It may have any of the forms accepted by
-\fBTk_GetColor\fR.
-.TP
-\fB\-selectforeground \fIcolor\fR
-.
-\fIcolor\fR specifies the foreground color to use when displaying the
-item while it is selected. It may have any of the forms accepted by
-\fBTk_GetColor\fR.
-.RE
-.TP
-\fIpathName \fBnearest \fIy\fR
-.
-Given a y-coordinate within the listbox window, this command returns
-the index of the (visible) listbox element nearest to that y-coordinate.
-.TP
-\fIpathName \fBscan\fR \fIoption args\fR
-.
-This command is used to implement scanning on listboxes.  It has
-two forms, depending on \fIoption\fR:
-.RS
-.TP
-\fIpathName \fBscan mark \fIx y\fR
-.
-Records \fIx\fR and \fIy\fR and the current view in the listbox
-window;  used in conjunction with later \fBscan dragto\fR commands.
-Typically this command is associated with a mouse button press in
-the widget.  It returns an empty string.
-.TP
-\fIpathName \fBscan dragto \fIx y\fR.
-.
-This command computes the difference between its \fIx\fR and \fIy\fR
-arguments and the \fIx\fR and \fIy\fR arguments to the last
-\fBscan mark\fR command for the widget.
-It then adjusts the view by 10 times the
-difference in coordinates.  This command is typically associated
-with mouse motion events in the widget, to produce the effect of
-dragging the list at high speed through the window.  The return
-value is an empty string.
-.RE
-.TP
-\fIpathName \fBsee \fIindex\fR
-.
-Adjust the view in the listbox so that the element given by \fIindex\fR
-is visible.
-If the element is already visible then the command has no effect;
-if the element is near one edge of the window then the listbox
-scrolls to bring the element into view at the edge;  otherwise
-the listbox scrolls to center the element.
-.TP
-\fIpathName \fBselection \fIoption arg\fR
-.
-This command is used to adjust the selection within a listbox.  It
-has several forms, depending on \fIoption\fR:
-.RS
-.TP
-\fIpathName \fBselection anchor \fIindex\fR
-.
-Sets the selection anchor to the element given by \fIindex\fR.
-If \fIindex\fR refers to a non-existent element, then the closest
-element is used.
-The selection anchor is the end of the selection that is fixed
-while dragging out a selection with the mouse.
-The index \fBanchor\fR may be used to refer to the anchor
-element.
-.TP
-\fIpathName \fBselection clear \fIfirst \fR?\fIlast\fR?
-.
-If any of the elements between \fIfirst\fR and \fIlast\fR
-(inclusive) are selected, they are deselected.
-The selection state is not changed for elements outside
-this range.
-.TP
-\fIpathName \fBselection includes \fIindex\fR
-.
-Returns 1 if the element indicated by \fIindex\fR is currently
-selected, 0 if it is not.
-.TP
-\fIpathName \fBselection set \fIfirst \fR?\fIlast\fR?
-.
-Selects all of the elements in the range between
-\fIfirst\fR and \fIlast\fR, inclusive, without affecting
-the selection state of elements outside that range.
-.RE
-.TP
-\fIpathName \fBsize\fR
-.
-Returns a decimal string indicating the total number of elements
-in the listbox.
-.TP
-\fIpathName \fBxview \fR?\fIargs\fR
-.
-This command is used to query and change the horizontal position of the
-information in the widget's window.  It can take any of the following
-forms:
-.RS
-.TP
-\fIpathName \fBxview\fR
-.
-Returns a list containing two elements.
-Each element is a real fraction between 0 and 1;  together they describe
-the horizontal span that is visible in the window.
-For example, if the first element is .2 and the second element is .6,
-20% of the listbox's text is off-screen to the left, the middle 40% is visible
-in the window, and 40% of the text is off-screen to the right.
-These are the same values passed to scrollbars via the \fB\-xscrollcommand\fR
-option.
-.TP
-\fIpathName \fBxview \fIindex\fR
-.
-Adjusts the view in the window so that the character position given by
-\fIindex\fR is displayed at the left edge of the window.
-Character positions are defined by the width of the character \fB0\fR.
-.TP
-\fIpathName \fBxview moveto\fI fraction\fR
-.
-Adjusts the view in the window so that \fIfraction\fR of the
-total width of the listbox text is off-screen to the left.
-\fIfraction\fR must be a fraction between 0 and 1.
-.TP
-\fIpathName \fBxview scroll \fInumber what\fR
-.
-This command shifts the view in the window left or right according to
-\fInumber\fR and \fIwhat\fR.
-\fINumber\fR must be an integer.
-\fIWhat\fR must be either \fBunits\fR or \fBpages\fR or an abbreviation
-of one of these.
-If \fIwhat\fR is \fBunits\fR, the view adjusts left or right by
-\fInumber\fR character units (the width of the \fB0\fR character)
-on the display;  if it is \fBpages\fR then the view adjusts by
-\fInumber\fR screenfuls.
-If \fInumber\fR is negative then characters farther to the left
-become visible;  if it is positive then characters farther to the right
-become visible.
-.RE
-.TP
-\fIpathName \fByview \fR?\fIargs\fR?
-.
-This command is used to query and change the vertical position of the
-text in the widget's window.
-It can take any of the following forms:
-.RS
-.TP
-\fIpathName \fByview\fR
-Returns a list containing two elements, both of which are real fractions
-between 0 and 1.
-The first element gives the position of the listbox element at the
-top of the window, relative to the listbox as a whole (0.5 means
-it is halfway through the listbox, for example).
-The second element gives the position of the listbox element just after
-the last one in the window, relative to the listbox as a whole.
-These are the same values passed to scrollbars via the \fB\-yscrollcommand\fR
-option.
-.TP
-\fIpathName \fByview \fIindex\fR
-.
-Adjusts the view in the window so that the element given by
-\fIindex\fR is displayed at the top of the window.
-.TP
-\fIpathName \fByview moveto\fI fraction\fR
-.
-Adjusts the view in the window so that the element given by \fIfraction\fR
-appears at the top of the window.
-\fIFraction\fR is a fraction between 0 and 1;  0 indicates the first
-element in the listbox, 0.33 indicates the element one-third the
-way through the listbox, and so on.
-.TP
-\fIpathName \fByview scroll \fInumber what\fR
-.
-This command adjusts the view in the window up or down according to
-\fInumber\fR and \fIwhat\fR.
-\fINumber\fR must be an integer.
-\fIWhat\fR must be either \fBunits\fR or \fBpages\fR.
-If \fIwhat\fR is \fBunits\fR, the view adjusts up or down by
-\fInumber\fR lines;  if it is \fBpages\fR then
-the view adjusts by \fInumber\fR screenfuls.
-If \fInumber\fR is negative then earlier elements
-become visible;  if it is positive then later elements
-become visible.
-.RE
-.SH "DEFAULT BINDINGS"
-.PP
-Tk automatically creates class bindings for listboxes that give them
-Motif-like behavior.  Much of the behavior of a listbox is determined
-by its \fB\-selectmode\fR option, which selects one of four ways
-of dealing with the selection.
-.PP
-If the selection mode is \fBsingle\fR or \fBbrowse\fR, at most one
-element can be selected in the listbox at once.
-In both modes, clicking button 1 on an element selects
-it and deselects any other selected item.
-In \fBbrowse\fR mode it is also possible to drag the selection
-with button 1.
-On button 1, the listbox will also take focus if it has a \fBnormal\fR
-state.
-.PP
-If the selection mode is \fBmultiple\fR or \fBextended\fR,
-any number of elements may be selected at once, including discontiguous
-ranges.  In \fBmultiple\fR mode, clicking button 1 on an element
-toggles its selection state without affecting any other elements.
-In \fBextended\fR mode, pressing button 1 on an element selects
-it, deselects everything else, and sets the anchor to the element
-under the mouse;  dragging the mouse with button 1
-down extends the selection to include all the elements between
-the anchor and the element under the mouse, inclusive.
-.PP
-Most people will probably want to use \fBbrowse\fR mode for
-single selections and \fBextended\fR mode for multiple selections;
-the other modes appear to be useful only in special situations.
-.PP
-Any time the set of selected item(s) in the listbox is updated by the
-user through the keyboard or mouse, the virtual event
-\fB<<ListboxSelect>>\fR will be generated. This virtual event will not
-be generated when adjusting the selection with the \fIpathName
-\fBselection\fR  command. It is easiest to bind to this event to be
-made aware of any user changes to listbox selection.
-.PP
-In addition to the above behavior, the following additional behavior
-is defined by the default bindings:
-.IP [1]
-In \fBextended\fR mode, the selected range can be adjusted by pressing
-button 1 with the Shift key down:  this modifies the selection to
-consist of the elements between the anchor and the element under
-the mouse, inclusive.
-The un-anchored end of this new selection can also be dragged with
-the button down.
-.IP [2]
-In \fBextended\fR mode, pressing button 1 with the Control key down
-starts a toggle operation: the anchor is set to the element under
-the mouse, and its selection state is reversed.  The selection state
-of other elements is not changed.
-If the mouse is dragged with button 1 down, then the selection state
-of all elements between the anchor and the element under the mouse
-is set to match that of the anchor element;  the selection state of
-all other elements remains what it was before the toggle operation
-began.
-.IP [3]
-If the mouse leaves the listbox window with button 1 down, the window
-scrolls away from the mouse, making information visible that used
-to be off-screen on the side of the mouse.
-The scrolling continues until the mouse re-enters the window, the
-button is released, or the end of the listbox is reached.
-.IP [4]
-Mouse button 2 may be used for scanning.
-If it is pressed and dragged over the listbox, the contents of
-the listbox drag at high speed in the direction the mouse moves.
-.IP [5]
-If the Up or Down key is pressed, the location cursor (active
-element) moves up or down one element.
-If the selection mode is \fBbrowse\fR or \fBextended\fR then the
-new active element is also selected and all other elements are
-deselected.
-In \fBextended\fR mode the new active element becomes the
-selection anchor.
-.IP [6]
-In \fBextended\fR mode, Shift-Up and Shift-Down move the location
-cursor (active element) up or down one element and also extend
-the selection to that element in a fashion similar to dragging
-with mouse button 1.
-.IP [7]
-The Left and Right keys scroll the listbox view left and right
-by the width of the character \fB0\fR.
-Control-Left and Control-Right scroll the listbox view left and
-right by the width of the window.
-Control-Prior and Control-Next also scroll left and right by
-the width of the window.
-.IP [8]
-The Prior and Next keys scroll the listbox view up and down
-by one page (the height of the window).
-.IP [9]
-The Home and End keys scroll the listbox horizontally to
-the left and right edges, respectively.
-.IP [10]
-Control-Home sets the location cursor to the first element in
-the listbox, selects that element, and deselects everything else
-in the listbox.
-.IP [11]
-Control-End sets the location cursor to the last element in
-the listbox, selects that element, and deselects everything else
-in the listbox.
-.IP [12]
-In \fBextended\fR mode, Control-Shift-Home extends the selection
-to the first element in the listbox and Control-Shift-End extends
-the selection to the last element.
-.IP [13]
-In \fBmultiple\fR mode, Control-Shift-Home moves the location cursor
-to the first element in the listbox and Control-Shift-End moves
-the location cursor to the last element.
-.IP [14]
-The space and Select keys make a selection at the location cursor
-(active element) just as if mouse button 1 had been pressed over
-this element.
-.IP [15]
-In \fBextended\fR mode, Control-Shift-space and Shift-Select
-extend the selection to the active element just as if button 1
-had been pressed with the Shift key down.
-.IP [16]
-In \fBextended\fR mode, the Escape key cancels the most recent
-selection and restores all the elements in the selected range
-to their previous selection state.
-.IP [17]
-Control-slash selects everything in the widget, except in
-\fBsingle\fR and \fBbrowse\fR modes, in which case it selects
-the active element and deselects everything else.
-.IP [18]
-Control-backslash deselects everything in the widget, except in
-\fBbrowse\fR mode where it has no effect.
-.IP [19]
-The F16 key (labelled Copy on many Sun workstations) or Meta-w
-copies the selection in the widget to the clipboard, if there is
-a selection.
-.PP
-The behavior of listboxes can be changed by defining new bindings for
-individual widgets or by redefining the class bindings.
-.SH "SEE ALSO"
-ttk::treeview(n)
-.SH KEYWORDS
-listbox, widget
-'\" Local Variables:
-'\" mode: nroff
-'\" End: