Section: Tk Themed Widget (n)
ttk::scrollbar - Control the viewport of a scrollable widget
ttk::scrollbar widgets are typically linked to an associated window
that displays a document of some sort, such as a file being edited or a
A scrollbar displays a thumb in the middle portion of the scrollbar,
whose position and size provides information about the portion of the
document visible in the associated window.
The thumb may be dragged by the user to control the visible region.
Depending on the theme, two or more arrow buttons may also be present;
these are used to scroll the visible region in discrete units.
See the ttk_widget manual entry for details on the standard options.
A Tcl script prefix to evaluate
to change the view in the widget associated with the scrollbar.
Additional arguments are appended to the value of this option,
as described in SCROLLING COMMANDS below,
whenever the user requests a view change by manipulating the scrollbar.
This option typically consists of a two-element list,
containing the name of a scrollable widget followed by
either xview (for horizontal scrollbars)
or yview (for vertical scrollbars).
One of horizontal or vertical.
Specifies the orientation of the scrollbar.
- pathName cget option
Returns the current value of the specified option; see ttk::widget(n).
- pathName configure ?option? ?value option value ...?
Modify or query widget options; see ttk::widget(n).
- 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 at position x, y.
- pathName instate statespec ?script?
Test the widget state; see ttk::widget(n).
- pathName set first last
This command is normally invoked by the scrollbar's associated widget
from an -xscrollcommand or -yscrollcommand callback.
Specifies the visible range to be displayed.
first and last are real fractions between 0 and 1.
- pathName state ?stateSpec?
Modify or query the widget state; see ttk::widget(n).
The following widget commands are used internally
by the TScrollbar widget class bindings.
- pathName delta deltaX deltaY
Returns a real number indicating the fractional change in
the scrollbar setting that corresponds to a given change
in thumb position. For example, if the scrollbar is horizontal,
the result indicates how much the scrollbar setting must change
to move the thumb 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 thumb 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,
where 0.0 corresponds to the top or left of the trough
and 1.0 corresponds to the bottom or right.
X and y are pixel coordinates relative to the scrollbar
If x and y refer to a point outside the trough, the closest
point in the trough is used.
When the user interacts with the scrollbar, for example by dragging
the thumb, 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
The scrollbar automatically sets the disabled state bit.
when the entire range is visible (range is 0.0 to 1.0),
and clears it otherwise.
It also sets the active and pressed state flags
of individual elements, based on the position and state of the mouse pointer.
set f [frame .f]
ttk::scrollbar $f.hsb -orient horizontal -command [list $f.t xview]
ttk::scrollbar $f.vsb -orient vertical -command [list $f.t yview]
text $f.t -xscrollcommand [list $f.hsb set] -yscrollcommand [list $f.vsb set]
grid $f.t -row 0 -column 0 -sticky nsew
grid $f.vsb -row 0 -column 1 -sticky nsew
grid $f.hsb -row 1 -column 0 -sticky nsew
grid columnconfigure $f 0 -weight 1
grid rowconfigure $f 0 -weight 1