"Fossies" - the Fresh Open Source Software Archive

Member "SAOImageDS9/tk8.6/doc/ttk_scrollbar.n" (13 Nov 2019, 7401 Bytes) of package /linux/misc/ds9.8.1.tar.gz:


Caution: As a special service "Fossies" has tried to format the requested manual source page into HTML format but links to other man pages may be missing or even erroneous. Alternatively you can here view or download the uninterpreted manual source code. A member file download can also be achieved by clicking within a package contents listing on the according byte size field.

ttk::scrollbar

NAME
SYNOPSIS
DESCRIPTION
WIDGET-SPECIFIC OPTIONS
WIDGET COMMAND
INTERNAL COMMANDS
SCROLLING COMMANDS
WIDGET STATES
EXAMPLE
STYLING OPTIONS
SEE ALSO
KEYWORDS

NAME

ttk::scrollbar − Control the viewport of a scrollable widget

SYNOPSIS

ttk::scrollbar pathName ?options...?

DESCRIPTION

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 drawing. 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. −class

−cursor

−style −takefocus

WIDGET-SPECIFIC OPTIONS

[−command command] 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).

[−orient orient] One of horizontal or vertical. Specifies the orientation of the scrollbar.

WIDGET COMMAND

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. See ttk::widget(n).

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).

INTERNAL COMMANDS

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 widget. If x and y refer to a point outside the trough, the closest point in the trough is used.

SCROLLING COMMANDS

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 become visible.

WIDGET STATES

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.

EXAMPLE

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 pack $f

STYLING OPTIONS

The class name for a ttk::scrollbar is TScrollbar.

Dynamic states: active, disabled.

TScrollbar (or more specifically Vertical.TScrollbar and Horizontal.TScrollbar) styling options that are configurable with ttk::style are:

−arrowcolor color
−arrowsize
amount
−background
color
−bordercolor
color
−darkcolor
color (color of the dark part of the 3D relief)
−foreground
color
−gripcount
count (number of lines on the thumb)
−lightcolor
color (color of the light part of the 3D relief)
−troughcolor
color

Some options are only available for specific themes.

See the ttk::style manual page for information on how to configure ttk styles.

SEE ALSO

ttk::widget(n), scrollbar(n)

KEYWORDS

scrollbar, widget