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- '\" $Header: /user6/ouster/wish/man/RCS/scrollbar.n,v 1.10 93/04/01 09:52:54 ouster Exp $ SPRITE (Berkeley)
- '/"
- .so man.macros
- .HS scrollbar tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- scrollbar \- Create and manipulate scrollbar widgets
- .SH SYNOPSIS
- \fBscrollbar\fI pathName \fR?\fIoptions\fR?
- .SH "STANDARD OPTIONS"
- .LP
- .nf
- .ta 4c 8c 12c
- .VS
- \fBactiveForeground\fR \fBcursor\fR \fBrelief\fR
- .VE
- \fBbackground\fR \fBforeground\fR \fBrepeatDelay\fR
- \fBborderWidth\fR \fBorient\fR \fBrepeatInterval\fR
- .fi
- .LP
- See the ``options'' manual entry for details on the standard options.
- .SH "WIDGET-SPECIFIC OPTIONS"
- .ta 4c
- .LP
- .nf
- Name: \fBcommand\fR
- Class: \fBCommand\fR
- Command-Line Switch: \fB\-command\fR
- .fi
- .IP
- 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
- a space and a number. The number indicates the logical unit that
- should appear at the top of the associated window.
- .LP
- .nf
- Name: \fBwidth\fR
- Class: \fBWidth\fR
- Command-Line Switch: \fB\-width\fR
- .fi
- .IP
- 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.
- .VS
- The value may have any of the forms acceptable to \fBTk_GetPixels\fR.
- .VE
- .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. A scrollbar is used to provide information about what
- is visible in an \fIassociated window\fR that displays an object
- of some sort (such as a file being edited or a drawing).
- The position and size of the slider indicate which portion of the
- object 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 object.
- .PP
- 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.
-
- .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:
- .DS C
- \fIpathName option \fR?\fIarg arg ...\fR?
- .DE
- \fIOption\fR and the \fIarg\fRs
- determine the exact behavior of the command. The following
- commands are possible for scrollbar widgets:
- .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 \fBget\fR
- Returns a Tcl list containing four decimal values, which are
- the current \fItotalUnits\fR, \fIwidnowUnits\fR, \fIfirstUnit\fR,
- and \fIlastUnit\fR values for the scrollbar. These are the values
- from the most recent \fBset\fR widget command on the scrollbar.
- .TP
- \fIpathName \fBset\fR \fItotalUnits windowUnits firstUnit lastUnit\fR
- This command is invoked to give the scrollbar information about the
- widget associated with the scrollbar. \fITotalUnits\fR is an integer
- value giving 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). This command should
- be invoked by the associated widget whenever its object or window
- changes size and whenever it changes the view in its window.
-
- .SH BINDINGS
- .PP
- The description below assumes a vertically-oriented scrollbar.
- For a horizontally-oriented scrollbar replace the words ``up'', ``down'',
- ``top'', and ``bottom'' with ``left'', ``right'', ``left'',
- and ``right'', respectively
- .PP
- A scrollbar widget is divided into five distinct areas. From top
- to bottom, they are: the top arrow, the top gap (the empty space
- between the arrow and the slider), the slider, the bottom gap,
- and the bottom arrow. Pressing mouse button 1 in each area has
- a different effect:
- .TP 20
- \fBtop arrow\fR
- Causes the view in the associated window to shift up by one unit
- (i.e. the object appears to move down one unit in its window).
- If the button is held down the action will auto-repeat.
- .TP 20
- \fBtop gap\fR
- Causes the view in the associated window to shift up by one
- less than the number of units in the window
- (i.e. the portion of the object that used to appear at the very
- top of the window will now appear at the very bottom).
- If the button is held down the action will auto-repeat.
- .TP 20
- \fBslider\fR
- Pressing button 1 in this area has no immediate effect except to
- cause the slider to appear sunken rather than raised. However,
- if the mouse is moved with the button down then the slider will
- be dragged, adjusting the view as the mouse is moved.
- .TP 20
- \fBbottom gap\fR
- Causes the view in the associated window to shift down by one
- less than the number of units in the window
- (i.e. the portion of the object that used to appear at the very
- bottom of the window will now appear at the very top).
- If the button is held down the action will auto-repeat.
- .TP 20
- \fBbottom arrow\fR
- Causes the view in the associated window to shift down by one unit
- (i.e. the object appears to move up one unit in its window).
- If the button is held down the action will auto-repeat.
- .PP
- Note: none of the actions described above has an immediate impact
- on the position of the slider in the scrollbar. It simply invokes
- the command specified in the \fBcommand\fR option to notify the
- associated widget that a change in view is desired. If the view is
- actually changed then the associated widget must invoke the
- scrollbar's \fBset\fR widget command to change what is displayed in
- the scrollbar.
-
- .SH KEYWORDS
- scrollbar, widget
-