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-'\"
-'\" Copyright (c) 1990-1994 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 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 scrollbar n 4.1 Tk "Tk Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-scrollbar \- Create and manipulate 'scrollbar' scrolling control and indicator widgets
-.SH SYNOPSIS
-\fBscrollbar\fR \fIpathName \fR?\fIoptions\fR?
-.SO
-\-activebackground	\-highlightcolor	\-repeatdelay
-\-background	\-highlightthickness	\-repeatinterval
-\-borderwidth	\-jump	\-takefocus
-\-cursor	\-orient	\-troughcolor
-\-highlightbackground	\-relief
-.SE
-.SH "WIDGET-SPECIFIC OPTIONS"
-.OP \-activerelief activeRelief ActiveRelief
-Specifies the relief to use when displaying the element that is
-active, if any.
-Elements other than the active element are always displayed with
-a raised relief.
-.OP \-command command Command
-Specifies the prefix of a Tcl command to invoke to change the view
-in the widget associated with the scrollbar.  When a user requests
-a view change by manipulating the scrollbar, a Tcl command is
-invoked.  The actual command consists of this option followed by
-additional information as described later.  This option almost always has
-a value such as \fB.t xview\fR or \fB.t yview\fR, consisting of the
-name of a widget and either \fBxview\fR (if the scrollbar is for
-horizontal scrolling) or \fByview\fR (for vertical scrolling).
-All scrollable widgets have \fBxview\fR and \fByview\fR commands
-that take exactly the additional arguments appended by the scrollbar
-as described in \fBSCROLLING COMMANDS\fR below.
-.OP \-elementborderwidth elementBorderWidth BorderWidth
-Specifies the width of borders drawn around the internal elements
-of the scrollbar (the two arrows and the slider).  The value may
-have any of the forms acceptable to \fBTk_GetPixels\fR.
-If this value is less than zero, the value of the \fB\-borderwidth\fR
-option is used in its place.
-.OP \-width width Width
-Specifies the desired narrow dimension of the scrollbar window,
-not including 3-D border, if any.  For vertical
-scrollbars this will be the width and for horizontal scrollbars
-this will be the height.
-The value may have any of the forms acceptable to \fBTk_GetPixels\fR.
-.BE
-.SH DESCRIPTION
-.PP
-The \fBscrollbar\fR command creates a new window (given by the
-\fIpathName\fR argument) and makes it into a scrollbar widget.
-Additional options, described above, may be specified on the command
-line or in the option database to configure aspects of the scrollbar
-such as its colors, orientation, and relief.
-The \fBscrollbar\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 scrollbar is a widget that displays two arrows, one at each end of
-the scrollbar, and a \fIslider\fR in the middle portion of the
-scrollbar.
-It provides information about what is visible in an \fIassociated window\fR
-that displays a document of some sort (such as a file being edited or
-a drawing).
-The position and size of the slider indicate which portion of the
-document is visible in the associated window.  For example, if the
-slider in a vertical scrollbar covers the top third of the area
-between the two arrows, it means that the associated window displays
-the top third of its document.
-.PP
-Scrollbars can be used to adjust the view in the associated window
-by clicking or dragging with the mouse.  See the \fBBINDINGS\fR section
-below for details.
-.SH "ELEMENTS"
-.PP
-A scrollbar displays five elements, which are referred to in the
-widget commands for the scrollbar:
-.TP 10
-\fBarrow1\fR
-The top or left arrow in the scrollbar.
-.TP 10
-\fBtrough1\fR
-The region between the slider and \fBarrow1\fR.
-.TP 10
-\fBslider\fR
-The rectangle that indicates what is visible in the associated widget.
-.TP 10
-\fBtrough2\fR
-The region between the slider and \fBarrow2\fR.
-.TP 10
-\fBarrow2\fR
-The bottom or right arrow in the scrollbar.
-.SH "WIDGET COMMAND"
-.PP
-The \fBscrollbar\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 scrollbar widgets:
-.TP
-\fIpathName \fBactivate \fR?\fIelement\fR?
-.
-Marks the element indicated by \fIelement\fR as active, which
-causes it to be displayed as specified by the \fB\-activebackground\fR
-and \fB\-activerelief\fR options.
-The only element values understood by this command are \fBarrow1\fR,
-\fBslider\fR, or \fBarrow2\fR.
-If any other value is specified then no element of the scrollbar
-will be active.
-If \fIelement\fR is not specified, the command returns
-the name of the element that is currently active, or an empty string
-if no element is active.
-.TP
-\fIpathName \fBcget \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 \fBscrollbar\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 \fBscrollbar\fR
-command.
-.TP
-\fIpathName \fBdelta \fIdeltaX deltaY\fR
-.
-Returns a real number indicating the fractional change in
-the scrollbar setting that corresponds to a given change
-in slider position.  For example, if the scrollbar is horizontal,
-the result indicates how much the scrollbar setting must change
-to move the slider \fIdeltaX\fR pixels to the right (\fIdeltaY\fR is
-ignored in this case).
-If the scrollbar is vertical, the result indicates how much the
-scrollbar setting must change to move the slider \fIdeltaY\fR pixels
-down.  The arguments and the result may be zero or negative.
-.TP
-\fIpathName \fBfraction \fIx y\fR
-.
-Returns a real number between 0 and 1 indicating where the point
-given by \fIx\fR and \fIy\fR lies in the trough area of the scrollbar.
-The value 0 corresponds to the top or left of the trough, the
-value 1 corresponds to the bottom or right, 0.5 corresponds to
-the middle, and so on.
-\fIX\fR and \fIy\fR must be pixel coordinates relative to the scrollbar
-widget.
-If \fIx\fR and \fIy\fR refer to a point outside the trough, the closest
-point in the trough is used.
-.TP
-\fIpathName \fBget\fR
-.
-Returns the scrollbar settings in the form of a list whose
-elements are the arguments to the most recent \fBset\fR widget command.
-.TP
-\fIpathName \fBidentify \fIx y\fR
-.
-Returns the name of the element under the point given by \fIx\fR and
-\fIy\fR (such as \fBarrow1\fR), or an empty string if the point does
-not lie in any element of the scrollbar.
-\fIX\fR and \fIy\fR must be pixel coordinates relative to the scrollbar
-widget.
-.TP
-\fIpathName \fBset \fIfirst last\fR
-.
-This command is invoked by the scrollbar's associated widget to
-tell the scrollbar about the current view in the widget.
-The command takes two arguments, each of which is a real fraction
-between 0 and 1.
-The fractions describe the range of the document that is visible in
-the associated widget.
-For example, if \fIfirst\fR is 0.2 and \fIlast\fR is 0.4, it means
-that the first part of the document visible in the window is 20%
-of the way through the document, and the last visible part is 40%
-of the way through.
-.SH "SCROLLING COMMANDS"
-.PP
-When the user interacts with the scrollbar, for example by dragging
-the slider, the scrollbar notifies the associated widget that it
-must change its view.
-The scrollbar makes the notification by evaluating a Tcl command
-generated from the scrollbar's \fB\-command\fR option.
-The command may take any of the following forms.
-In each case, \fIprefix\fR is the contents of the
-\fB\-command\fR option, which usually has a form like
-.QW \fB.t yview\fR .
-.TP
-\fIprefix \fBmoveto \fIfraction\fR
-.
-\fIFraction\fR is a real number between 0 and 1.
-The widget should adjust its view so that the point given
-by \fIfraction\fR appears at the beginning of the widget.
-If \fIfraction\fR is 0 it refers to the beginning of the
-document.  1.0 refers to the end of the document, 0.333
-refers to a point one-third of the way through the document,
-and so on.
-.TP
-\fIprefix \fBscroll \fInumber \fBunits\fR
-.
-The widget should adjust its view by \fInumber\fR units.
-The units are defined in whatever way makes sense for the widget,
-such as characters or lines in a text widget.
-\fINumber\fR is either 1, which means one unit should scroll off
-the top or left of the window, or \-1, which means that one unit
-should scroll off the bottom or right of the window.
-.TP
-\fIprefix \fBscroll \fInumber \fBpages\fR
-.
-The widget should adjust its view by \fInumber\fR pages.
-It is up to the widget to define the meaning of a page;  typically
-it is slightly less than what fits in the window, so that there
-is a slight overlap between the old and new views.
-\fINumber\fR is either 1, which means the next page should
-become visible, or \-1, which means that the previous page should
-become visible.
-.SH "OLD COMMAND SYNTAX"
-.PP
-In versions of Tk before 4.0, the \fBset\fR and \fBget\fR widget
-commands used a different form.
-This form is still supported for backward compatibility, but it
-is deprecated.
-In the old command syntax, the \fBset\fR widget command has the
-following form:
-.TP
-\fIpathName \fBset \fItotalUnits windowUnits firstUnit lastUnit\fR
-In this form the arguments are all integers.
-\fITotalUnits\fR gives the total size of the object being displayed in the
-associated widget.  The meaning of one unit depends on the associated
-widget;  for example, in a text editor widget units might
-correspond to lines of
-text.  \fIWindowUnits\fR indicates the total number of units that
-can fit in the associated window at one time.  \fIFirstUnit\fR
-and \fIlastUnit\fR give the indices of the first and last units
-currently visible in the associated window (zero corresponds to the
-first unit of the object).
-.LP
-Under the old syntax the \fBget\fR widget command returns a list
-of four integers, consisting of the \fItotalUnits\fR, \fIwindowUnits\fR,
-\fIfirstUnit\fR, and \fIlastUnit\fR values from the last \fBset\fR
-widget command.
-.PP
-The commands generated by scrollbars also have a different form
-when the old syntax is being used:
-.TP
-\fIprefix\fR \fIunit\fR
-\fIUnit\fR is an integer that indicates what should appear at
-the top or left of the associated widget's window.
-It has the same meaning as the \fIfirstUnit\fR and \fIlastUnit\fR
-arguments to the \fBset\fR widget command.
-.LP
-The most recent \fBset\fR widget command determines whether or not
-to use the old syntax.
-If it is given two real arguments then the new syntax will be
-used in the future, and if it is given four integer arguments then
-the old syntax will be used.
-.SH BINDINGS
-.PP
-Tk automatically creates class bindings for scrollbars that give them
-the following default behavior.
-If the behavior is different for vertical and horizontal scrollbars,
-the horizontal behavior is described in parentheses.
-.IP [1]
-Pressing button 1 over \fBarrow1\fR causes the view in the
-associated widget to shift up (left) by one unit so that the
-document appears to move down (right) one unit.
-If the button is held down, the action auto-repeats.
-.IP [2]
-Pressing button 1 over \fBtrough1\fR causes the view in the
-associated widget to shift up (left) by one screenful so that the
-document appears to move down (right) one screenful.
-If the button is held down, the action auto-repeats.
-.IP [3]
-Pressing button 1 over the slider and dragging causes the view
-to drag with the slider.
-If the \fBjump\fR option is true, then the view does not drag along
-with the slider;  it changes only when the mouse button is released.
-.IP [4]
-Pressing button 1 over \fBtrough2\fR causes the view in the
-associated widget to shift down (right) by one screenful so that the
-document appears to move up (left) one screenful.
-If the button is held down, the action auto-repeats.
-.IP [5]
-Pressing button 1 over \fBarrow2\fR causes the view in the
-associated widget to shift down (right) by one unit so that the
-document appears to move up (left) one unit.
-If the button is held down, the action auto-repeats.
-.IP [6]
-If button 2 is pressed over the trough or the slider, it sets
-the view to correspond to the mouse position;  dragging the
-mouse with button 2 down causes the view to drag with the mouse.
-If button 2 is pressed over one of the arrows, it causes the
-same behavior as pressing button 1.
-.IP [7]
-If button 1 is pressed with the Control key down, then if the
-mouse is over \fBarrow1\fR or \fBtrough1\fR the view changes
-to the very top (left) of the document;  if the mouse is over
-\fBarrow2\fR or \fBtrough2\fR the view changes
-to the very bottom (right) of the document;  if the mouse is
-anywhere else then the button press has no effect.
-.IP [8]
-In vertical scrollbars the Up and Down keys have the same behavior
-as mouse clicks over \fBarrow1\fR and \fBarrow2\fR, respectively.
-In horizontal scrollbars these keys have no effect.
-.IP [9]
-In vertical scrollbars Control-Up and Control-Down have the same
-behavior as mouse clicks over \fBtrough1\fR and \fBtrough2\fR, respectively.
-In horizontal scrollbars these keys have no effect.
-.IP [10]
-In horizontal scrollbars the Up and Down keys have the same behavior
-as mouse clicks over \fBarrow1\fR and \fBarrow2\fR, respectively.
-In vertical scrollbars these keys have no effect.
-.IP [11]
-In horizontal scrollbars Control-Up and Control-Down have the same
-behavior as mouse clicks over \fBtrough1\fR and \fBtrough2\fR, respectively.
-In vertical scrollbars these keys have no effect.
-.IP [12]
-The Prior and Next keys have the same behavior
-as mouse clicks over \fBtrough1\fR and \fBtrough2\fR, respectively.
-.IP [13]
-The Home key adjusts the view to the top (left edge) of the document.
-.IP [14]
-The End key adjusts the view to the bottom (right edge) of the document.
-.SH EXAMPLE
-.PP
-Create a window with a scrollable \fBtext\fR widget:
-.CS
-toplevel .tl
-text .tl.t \-yscrollcommand {.tl.s set}
-\fBscrollbar\fR .tl.s \-command {.tl.t yview}
-grid .tl.t .tl.s \-sticky nsew
-grid columnconfigure .tl 0 \-weight 1
-grid rowconfigure .tl 0 \-weight 1
-.CE
-.SH "SEE ALSO"
-ttk:scrollbar(n)
-.SH KEYWORDS
-scrollbar, widget
-'\" Local Variables:
-'\" mode: nroff
-'\" End: