scrollbar(n) Tk Built-In Commands scrollbar(n)
____________________________________________________________________________________________________________
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 infor-mation information
mation 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 an document of some sort (such as a file being edited or a drawing). The posi-tion position
tion and size of the slider indicate which portion of the document is visible in the associated win-dow. window.
dow. 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 informa-tion information
tion 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 correspond-ing corresponding
ing 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 val-ues values
ues accepted by the scrollbar command.
pathName delta deltaX deltaY
Returns a real number indicating the fractional change in the scrollbar setting that corre-sponds corresponds
sponds 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 indi-cates indicates
cates 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 out-side outside
side 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 coor-dinates coordinates
dinates 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 noti-fies notifies
fies 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 mean-ing meaning
ing 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. Win-dowUnits WindowUnits
dowUnits 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 wid-get's widget's
get's window. It has the same meaning as the firstUnit and lastUnit arguments to the set wid-get widget
get 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.
KEYWORDS
scrollbar, widget
Tk 4.1 scrollbar(n)
|