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- '\" $Header: /user6/ouster/wish/man/RCS/listbox.n,v 1.15 93/04/15 08:26:00 ouster Exp $ SPRITE (Berkeley)
- '/"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
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- .HS listbox tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- listbox \- Create and manipulate listbox widgets
- .SH SYNOPSIS
- \fBlistbox\fI \fIpathName \fR?\fIoptions\fR?
- .SH "STANDARD OPTIONS"
- .LP
- .nf
- .ta 4c 8c 12c
- .VS
- \fBbackground\fR \fBforeground\fR \fBselectBackground\fR \fBxScrollCommand\fR
- \fBborderWidth\fR \fBfont\fR \fBselectBorderWidth\fR \fByScrollCommand\fR
- \fBcursor\fR \fBgeometry\fR \fBselectForeground\fR
- \fBexportSelection\fR \fBrelief\fR \fBsetGrid\fR
- .VE
- .fi
- .LP
- See the ``options'' manual entry for details on the standard options.
- .SH "WIDGET-SPECIFIC OPTIONS"
- .ta 4c
- .LP
- None.
- .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 in its list.
- Elements may be added or deleted using widget commands described
- below. In addition, one or more elements may be selected as described
- below.
- .VS
- If a listbox is exporting its selection (see \fBexportSelection\fR
- option), then it will observe the standard X11 protocols
- .VE
- for handling the selection; listbox selections are available
- as type \fBSTRING\fR, consisting of a Tcl list with one entry
- for each selected element.
- .PP
- For large lists only a subset of the list elements will be
- displayed in the listbox window at once; commands described below
- may be used to change the view in the window. Listboxes allow
- .VS
- scrolling in both directions using the standard \fBxScrollCommand\fR
- and \fByScrollCommand\fR options.
- .VE
- They also support scanning, as described below.
-
- .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:
- .DS C
- \fIpathName option \fR?\fIarg arg ...\fR?
- .DE
- \fIOption\fR and the \fIarg\fRs
- determine the exact behavior of the command. The following
- commands are possible for listbox widgets:
- .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
- .VS
- Returns a list containing the 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.
- .VE
- .TP
- \fIpathName \fBdelete \fIfirst \fR?\fIlast\fR?
- Delete one or more elements of the listbox. \fIFirst\fR and \fIlast\fR
- give the integer indices of the first and last elements in the range
- to be deleted. If \fIlast\fR isn't specified it defaults to
- \fIfirst\fR, i.e. a single element is deleted. An index of
- \fB0\fR corresponds to the first element in the listbox. Either
- \fIfirst\fR or \fIlast\fR may be specified as \fBend\fR, in which
- case it refers to the last element of the listbox. This command
- returns an empty string
- .TP
- \fIpathName \fBget \fIindex\fR
- Return the contents of the listbox element indicated by \fIindex\fR.
- \fIIndex\fR must be a non-negative integer (0 corresponds to
- the first element in the listbox), or it may also be specified as
- \fBend\fR to indicate the last element in the listbox.
- .TP
- \fIpathName \fBinsert \fIindex \fR?\fIelement element ...\fR?
- Insert 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 \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
- .VS
- 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
- .VE
- 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 \fBselect \fIoption arg\fR
- This command is used to adjust the selection within a listbox. It
- has several forms, depending on \fIoption\fR. In all of the forms
- the index \fBend\fR refers to the last element in the listbox.
- .RS
- .TP
- \fIpathName \fBselect adjust \fIindex\fR
- Locate the end of the selection nearest to the element given by
- \fIindex\fR, and adjust that end of the selection to be at \fIindex\fR
- (i.e including but not going beyond \fIindex\fR). The other
- end of the selection is made the anchor point for future
- \fBselect to\fR commands. If the selection
- isn't currently in the listbox, then this command is identical to
- the \fBselect from\fR widget command.
- Returns an empty string.
- .TP
- \fIpathName \fBselect clear\fR
- .VS
- If the selection is in this listbox then it is cleared so that
- none of the listbox's elements are selected anymore.
- .VE
- .TP
- \fIpathName \fBselect from \fIindex\fR
- Set the selection to consist of element \fIindex\fR, and make
- \fIindex\fR the anchor point for future \fBselect to\fR widget
- commands. Returns an empty string.
- .TP
- \fIpathName \fBselect to \fIindex\fR
- Set the selection to consist of the elements from the anchor
- point to element \fIindex\fR, inclusive. The anchor point is
- determined by the most recent \fBselect from\fR or \fBselect adjust\fR
- command in this widget. If the selection isn't in this widget,
- this command is identical to \fBselect from\fR.
- Returns an empty string.
- .RE
- .TP
- \fIpathName \fBsize\fR
- Returns a decimal string indicating the total number of elements
- in the listbox.
- .TP
- \fIpathName \fBxview \fIindex\fR
- .VS
- Adjust the view in the listbox so that character position \fIindex\fR
- is displayed at the left edge of the widget.
- Returns an empty string.
- .TP
- \fIpathName \fByview \fIindex\fR
- Adjust the view in the listbox so that element \fIindex\fR is
- displayed at the top of the widget.
- If \fIindex\fR is specified as \fBend\fR it indicates the last
- element of the listbox. Returns an empty string.
- .VE
-
- .SH "DEFAULT BINDINGS"
- .PP
- .VS
- Tk automatically creates class bindings for listboxes that give them
- the following default behavior:
- .IP [1]
- When button 1 is pressed over a listbox, the element underneath the
- mouse cursor is selected. The mouse can be dragged to select a
- range of elements.
- .IP [2]
- The ends of the selection can be adjusted by dragging with mouse
- button 1 while the shift key is down; this will adjust the end
- of the selection that was nearest to the mouse cursor when button
- 1 was pressed.
- .IP [3]
- The view in the listbox can be adjusted by dragging with mouse button 2.
- .PP
- The behavior of listboxes can be changed by defining new bindings for
- individual widgets or by redefining the class bindings.
- In addition, the procedure \fBtk_listboxSingleSelect\fR may be
- invoked to change listbox behavior so that only a single element
- may be selected at once.
- .VE
-
- .SH KEYWORDS
- listbox, widget
-