Provided by: tk8.4-doc_8.4.20-7_all 
NAME
scrollbar - Create and manipulate scrollbar widgets
SYNOPSIS
scrollbar pathName ?options?
STANDARD OPTIONS
-activebackground -highlightcolor -repeatdelay
-background -highlightthickness -repeatinterval
-borderwidth -jump -takefocus
-cursor -orient -troughcolor
-highlightbackground -relief
See the options manual entry for details on the standard options.
WIDGET-SPECIFIC OPTIONS
Command-Line Name:-activerelief
Database Name: activeRelief
Database Class: 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.
Command-Line Name:-command
Database Name: command
Database Class: 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 .t xview or .t yview, consisting
of the name of a widget and either xview (if the scrollbar is for horizontal scrolling) or yview
(for vertical scrolling). All scrollable widgets have xview and yview commands that take exactly
the additional arguments appended by the scrollbar as described in SCROLLING COMMANDS below.
Command-Line Name:-elementborderwidth
Database Name: elementBorderWidth
Database Class: 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 Tk_GetPixels. If this value
is less than zero, the value of the borderWidth option is used in its place.
Command-Line Name:-width
Database Name: width
Database Class: 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 Tk_GetPixels.
_________________________________________________________________
DESCRIPTION
The scrollbar command creates a new window (given by the pathName 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
scrollbar command returns its pathName argument. At the time this command is invoked, there must not
exist a window named pathName, but pathName's parent must exist.
A scrollbar is a widget that displays two arrows, one at each end of the scrollbar, and a slider in the
middle portion of the scrollbar. It provides information about what is visible in an associated window
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.
Scrollbars can be used to adjust the view in the associated window by clicking or dragging with the
mouse. See the BINDINGS section below for details.
ELEMENTS
A scrollbar displays five elements, which are referred to in the widget commands for the scrollbar:
arrow1 The top or left arrow in the scrollbar.
trough1 The region between the slider and arrow1.
slider The rectangle that indicates what is visible in the associated widget.
trough2 The region between the slider and arrow2.
arrow2 The bottom or right arrow in the scrollbar.
WIDGET COMMAND
The scrollbar command creates a new Tcl command whose name is pathName. This command may be used to
invoke various operations on the widget. It has the following general form:
pathName option ?arg arg ...?
Option and the args determine the exact behavior of the command. The following commands are possible for
scrollbar widgets:
pathName activate ?element?
Marks the element indicated by element as active, which causes it to be displayed as specified by
the activeBackground and activeRelief options. The only element values understood by this command
are arrow1, slider, or arrow2. If any other value is specified then no element of the scrollbar
will be active. If element is not specified, the command returns the name of the element that is
currently active, or an empty string if no element is active.
pathName cget option
Returns the current value of the configuration option given by option. Option may have any of the
values accepted by the scrollbar 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 scrollbar
command.
pathName delta deltaX deltaY
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 deltaX pixels to the right
(deltaY is ignored in this case). If the scrollbar is vertical, the result indicates how much the
scrollbar setting must change to move the slider deltaY pixels down. The arguments and the result
may be zero or negative.
pathName fraction x y
Returns a real number between 0 and 1 indicating where the point given by x and y 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. X and y must be
pixel coordinates relative to the scrollbar widget. If x and y refer to a point outside the
trough, the closest point in the trough is used.
pathName get
Returns the scrollbar settings in the form of a list whose elements are the arguments to the most
recent set widget command.
pathName identify x y
Returns the name of the element under the point given by x and y (such as arrow1), or an empty
string if the point does not lie in any element of the scrollbar. X and y must be pixel
coordinates relative to the scrollbar widget.
pathName set first last
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 first is 0.2 and last 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.
SCROLLING COMMANDS
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 -command option. The command may take any of the following
forms. In each case, prefix is the contents of the -command option, which usually has a form like .t
yview
prefix moveto fraction
Fraction is a real number between 0 and 1. The widget should adjust its view so that the point
given by fraction appears at the beginning of the widget. If fraction 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.
prefix scroll number units
The widget should adjust its view by number units. The units are defined in whatever way makes
sense for the widget, such as characters or lines in a text widget. Number 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.
prefix scroll number pages
The widget should adjust its view by number 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. Number is either 1, which means the next page should
become visible, or -1, which means that the previous page should become visible.
OLD COMMAND SYNTAX
In versions of Tk before 4.0, the set and get widget commands used a different form. This form is still
supported for backward compatibility, but it is deprecated. In the old command syntax, the set widget
command has the following form:
pathName set totalUnits windowUnits firstUnit lastUnit
In this form the arguments are all integers. TotalUnits 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. WindowUnits
indicates the total number of units that can fit in the associated window at one time. FirstUnit
and lastUnit give the indices of the first and last units currently visible in the associated
window (zero corresponds to the first unit of the object).
Under the old syntax the get widget command returns a list of four integers, consisting of the
totalUnits, windowUnits, firstUnit, and lastUnit values from the last set widget command.
The commands generated by scrollbars also have a different form when the old syntax is being used:
prefix unit
Unit 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 firstUnit and lastUnit arguments to the set widget
command.
The most recent set 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.
BINDINGS
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.
[1] Pressing button 1 over arrow1 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.
[2] Pressing button 1 over trough1 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.
[3] Pressing button 1 over the slider and dragging causes the view to drag with the slider. If the
jump option is true, then the view doesn't drag along with the slider; it changes only when the
mouse button is released.
[4] Pressing button 1 over trough2 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.
[5] Pressing button 1 over arrow2 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.
[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.
[7] If button 1 is pressed with the Control key down, then if the mouse is over arrow1 or trough1 the
view changes to the very top (left) of the document; if the mouse is over arrow2 or trough2 the
view changes to the very bottom (right) of the document; if the mouse is anywhere else then the
button press has no effect.
[8] In vertical scrollbars the Up and Down keys have the same behavior as mouse clicks over arrow1 and
arrow2, respectively. In horizontal scrollbars these keys have no effect.
[9] In vertical scrollbars Control-Up and Control-Down have the same behavior as mouse clicks over
trough1 and trough2, respectively. In horizontal scrollbars these keys have no effect.
[10] In horizontal scrollbars the Up and Down keys have the same behavior as mouse clicks over arrow1
and arrow2, respectively. In vertical scrollbars these keys have no effect.
[11] In horizontal scrollbars Control-Up and Control-Down have the same behavior as mouse clicks over
trough1 and trough2, respectively. In vertical scrollbars these keys have no effect.
[12] The Prior and Next keys have the same behavior as mouse clicks over trough1 and trough2,
respectively.
[13] The Home key adjusts the view to the top (left edge) of the document.
[14] The End key adjusts the view to the bottom (right edge) of the document.
EXAMPLE
Create a window with a scrollable text widget:
toplevel .tl
text .tl.t -yscrollcommand {.tl.s set}
scrollbar .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
KEYWORDS
scrollbar, widget
Tk 4.1 scrollbar(3tk)