Tribblix: manual page: XmScale.3

XmScale(library call) XmScale(library call)

NAME

XmScale -- The Scale widget class

SYNOPSIS

#include <Xm/Scale.h>

DESCRIPTION

Scale is used by an application to indicate a value from within a
range of values, and it allows the user to input or modify a value
from the same range.

A Scale has an elongated rectangular region similar to a ScrollBar. A
slider inside this region indicates the current value along the
Scale. The user can also modify the Scale's value by moving the
slider within the rectangular region of the Scale. A Scale can also
include a label set located outside the Scale region. These can
indicate the relative value at various positions along the scale.
The placement of this label depends on the XmNlayoutDirection
resource of the widget.

A Scale can be either input/output or output only. An input/output
Scale's value can be set by the application and also modified by the
user with the slider. An output-only Scale is used strictly as an
indicator of the current value of something and cannot be modified
interactively by the user. The XmScale resource XmNeditable
specifies whether the user can interactively modify the Scale's
value.

The user can specify resources in a resource file for the
automatically created gadget that contains the title of the Scale
widget. The name of the gadget is Title. The placement of the title
depends on the XmNlayoutDirection resource of the widget. The
direction of the title is based on the widget's layout direction.

Scale uses the XmQTspecifyRenderTable trait, and holds the
XmQTtransfer trait.

Data Transfer Behavior

Scale supports dragging of the representation of the Scale value from
the Scale when the value is displayed and when the value of the
XmNenableUnselectableDrag resource of XmDisplay is set to True.

As a source of data, Scale supports the following targets and
associated conversions of data to these targets:

COMPOUND_TEXT
The widget transfers a string representation of XmNvalue as
type COMPOUND_TEXT.

UTF8_STRING
The widget transfers a string representation of XmNvalue as
type UTF8_STRING.

STRING The widget transfers a string representation of XmNvalue as
type STRING.

_MOTIF_CLIPBOARD_TARGETS
The widget transfers, as type ATOM, a list of the targets
it supports for the CLIPBOARD selection. These include
STRING, COMPOUND_TEXT and UTF8_STRING.

_MOTIF_EXPORT_TARGETS
The widget transfers, as type ATOM, a list of the targets
to be used as the value of the DragContext's
XmNexportTargets in a drag-and-drop transfer. These
include STRING, COMPOUND_TEXT and UTF8_STRING.

As a source of data, Scale also supports the following standard Motif
targets:

BACKGROUND
The widget transfers XmNbackground as type PIXEL.

CLASS The widget finds the first shell in the widget hierarchy
that has a WM_CLASS property and transfers the contents as
text in the current locale.

CLIENT_WINDOW
The widget finds the first shell in the widget hierarchy
and transfers its window as type WINDOW.

COLORMAP The widget transfers XmNcolormap as type COLORMAP.

FOREGROUND
The widget transfers XmNforeground as type PIXEL.

NAME The widget finds the first shell in the widget hierarchy
that has a WM_NAME property and transfers the contents as
text in the current locale.

TARGETS The widget transfers, as type ATOM, a list of the targets
it supports. These include the standard targets in this
list. These also include STRING, COMPOUND_TEXT and
UTF8_STRING.

TIMESTAMP The widget transfers the timestamp used to acquire the
selection as type INTEGER.

_MOTIF_RENDER_TABLE
The widget transfers XmNrenderTable if it exists, or else
the default text render table, as type STRING.

_MOTIF_ENCODING_REGISTRY
The widget transfers its encoding registry as type STRING.
The value is a list of NULL separated items in the form of
tag encoding pairs. This target symbolizes the transfer
target for the Motif Segment Encoding Registry. Widgets
and applications can use this Registry to register text
encoding formats for specified render table tags.
Applications access this Registry by calling
XmRegisterSegmentEncoding and XmMapSegmentEncoding.

Descendants

Scale automatically creates the descendants shown in the following
table. An application can use XtNameToWidget to gain access to the
named descendant. In addition, a user or an application can use the
named descendant when specifying resource values.

+-----------------+---------------+----------------+
|Named Descendant | Class | Identity |
+-----------------+---------------+----------------+
+=================+===============+================+
+-----------------+---------------+----------------+
|Scrollbar | XmScrollBar | scroll bar |
+-----------------+---------------+----------------+
|Title | XmLabelGadget | title of scale |
+-----------------+---------------+----------------+
+-----------------+---------------+----------------+

Classes

Scale inherits behavior, resources, and traits from Core, Composite,
Constraint, and XmManager classes.

The class pointer is xmScaleWidgetClass.

The class name is XmScale.

New Resources

The following table defines a set of widget resources used by the
programmer to specify data. The programmer can also set the resource
values for the inherited classes to set attributes for this widget.
To reference a resource by name or by class in a .Xdefaults file,
remove the XmN or XmC prefix and use the remaining letters. To
specify one of the defined values for a resource in a .Xdefaults
file, remove the Xm prefix and use the remaining letters (in either
lowercase or uppercase, but include any underscores between words).
The codes in the access column indicate if the given resource can be
set at creation time (C), set by using XtSetValues (S), retrieved by
using XtGetValues (G), or is not applicable (N/A).

+----------------------------------------------------------------------------------------+
| XmScale Resource Set |
|Name | Class | Type | Default | Access |
+------------------------+------------------------+----------------+------------+--------+
|XmNconvertCallback | XmCCallback | XtCallbackList | NULL | C |
+------------------------+------------------------+----------------+------------+--------+
|XmNdecimalPoints | XmCDecimalPoints | short | 0 | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNdragCallback | XmCCallback | XtCallbackList | NULL | C |
+------------------------+------------------------+----------------+------------+--------+
|XmNeditable | XmCEditable | Boolean | True | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNfontList | XmCFontList | XmFontList | dynamic | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNhighlightOnEnter | XmCHighlightOnEnter | Boolean | False | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNhighlightThickness | XmCHighlightThickness | Dimension | 2 | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNmaximum | XmCMaximum | int | 100 | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNminimum | XmCMinimum | int | 0 | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNorientation | XmCOrientation | unsigned char | XmVERTICAL | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNprocessingDirection | XmCProcessingDirection | unsigned char | dynamic | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNscaleHeight | XmCScaleHeight | Dimension | 0 | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNscaleMultiple | XmCScaleMultiple | int | dynamic | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNscaleWidth | XmCScaleWidth | Dimension | 0 | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNrenderTable | XmCRenderTable | XmRenderTable | dynamic | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNshowArrows | XmCShowArrows | XtEnum | XmNONE | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNshowValue | XmCShowValue | XtEnum | XmNONE | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNsliderMark | XmCSliderMark | XtEnum | dynamic | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNsliderVisual | XmCSliderVisual | XtEnum | dynamic | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNslidingMode | XmCSlidingMode | XtEnum | XmSLIDER | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNtitleString | XmCTitleString | XmString | NULL | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNvalue | XmCValue | int | dynamic | CSG |
+------------------------+------------------------+----------------+------------+--------+
|XmNvalueChangedCallback | XmCCallback | XtCallbackList | NULL | C |
+------------------------+------------------------+----------------+------------+--------+
+------------------------+------------------------+----------------+------------+--------+
XmNconvertCallback
Specifies a list of callbacks called when the Scale is
asked to convert a selection. The type of the structure
whose address is passed to these callbacks is
XmConvertCallbackStruct. The reason is XmCR_OK.

XmNdecimalPoints
Specifies the number of decimal points to shift the slider
value when displaying it. For example, a slider value of
2,350 and an XmdecimalPoints value of 2 results in a
display value of 23.50. The value must not be negative.

XmNdragCallback
Specifies the list of callbacks that is called when the
slider position changes as the slider is being dragged. The
reason sent by the callback is XmCR_DRAG.

XmNeditable
Specifies how the Scale scrollbar will react to user input.
This resource can be True or False values, as follows:

True Allows the scrollbar to be sensitive to user
input. This is the default value.

False Makes the Scale scrollbar insensitive to user
input. The visual is not greyed out. This value
would mostly be used in XmTHERMOMETER mode.

When XmNeditable is used on a widget it sets the dropsite
to XmDROP_SITE_ACTIVE.

XmNfontList
Specifies the font list to use for the title text string
specified by XmNtitleString, and the label displayed when
XmNshowValue is True. The font list is an obsolete
structure, and is retained only for compatibility with
earlier releases of Motif. See the XmNrenderTable resource.

XmNhighlightOnEnter
Specifies whether the highlighting rectangle is drawn when
the cursor moves into the widget. If the shell's focus
policy is XmEXPLICIT, this resource is ignored, and the
widget is highlighted when it has the focus. If the
shell's focus policy is XmPOINTER and if this resource is
True, the highlighting rectangle is drawn when the the
cursor moves into the widget. If the shell's focus policy
is XmPOINTER and if this resource is False, the
highlighting rectangle is not drawn when the the cursor
moves into the widget. The default is False.

XmNhighlightThickness
Specifies the size of the slider's border drawing rectangle
used for enter window and traversal highlight drawing.

XmNmaximum
Specifies the slider's maximum value. XmNmaximum must be
greater than XmNminimum.

XmNminimum
Specifies the slider's minimum value. XmNmaximum must be
greater than XmNminimum.

XmNorientation
Displays Scale vertically or horizontally. This resource
can have values of XmVERTICAL and XmHORIZONTAL.

XmNprocessingDirection
Specifies whether the value for XmNmaximum is on the right
or left side of XmNminimum for horizontal Scales or above
or below XmNminimum for vertical Scales. This resource can
have values of XmMAX_ON_TOP, XmMAX_ON_BOTTOM,
XmMAX_ON_LEFT, and XmMAX_ON_RIGHT. If the Scale is
oriented vertically, the default value is XmMAX_ON_TOP. If
the XmScale is oriented horizontally, the default value
depends on the XmNlayoutDirection resource of the widget.

XmNrenderTable
Specifies the render table to use for the title text string
specified by XmNtitleString, and the label displayed when
XmNshowValue is True. If this value is NULL at
initialization, the parent hierarchy is searched for an
ancestor that holds the XmQTspecifyRenderTable trait. If
such an ancestor is found, the render table is initialized
to the XmLABEL_RENDER_TABLE value of the ancestor widget.
If no such ancestor is found, the default is implementation
dependent. If a font list (XmNfontList) and a render table
are both specified, the render table will take precedence.
Refer to XmRenderTable(3) for more information on the
creation and structure of a render table.

XmNscaleHeight
Specifies the height of the slider area. The value should
be in the specified unit type (the default is pixels). If
no value is specified a default height is computed.

XmNscaleMultiple
Specifies the amount to move the slider when the user takes
an action that moves the slider by a multiple increment.
The default is (XmNmaximum - XmNminimum) divided by 10,
with a minimum of 1.

XmNscaleWidth
Specifies the width of the slider area. The value should
be in the specified unit type (the default is pixels). If
no value is specified a default width is computed.

XmNshowArrows
Specifies whether the arrows are displayed and how they are
to be displayed. This resource can take the following
values:

XmEACH_SIDE
Indicates that one arrow is displayed on each end
of the ScrollBar slider.

XmMAX_SIDE
Indicates that one arrow is displayed on the
XmNmaximum side of the ScrollBar slider.

XmMIN_SIDE
Indicates that one arrow is displayed on the
XmNminimum side of the ScrollBar slider.

XmNONE Indicates that no arrows are displayed.

XmNONE is the default value.

XmNshowValue
Specifies whether a label for the current slider value
should be displayed next to the slider. If the value is
XmNEAR_SLIDER, the current slider value is displayed. If
the value is XmNONE, no slider value is displayed. If the
value is XmNEAR_BORDER, the current slider value is
displayed near the border.

XmNsliderMark
Specifies the shape the slider is to be displayed in. This
resource can take the following values:

XmETCHED_LINE
Specifies the slider as an etched line. This is
the default when XmNslidingMode is XmSLIDER.

XmNONE Specifies the slider as a foregrounded rectangle.
This is the default when XmNslidingMode is
XmTHERMOMETER and the Scale scrollbar is
insensitive to user input (XmNeditable is False.

XmROUND_MARK
Specifies the slider as a shadowed circle. This
is the default when XmNslidingMode is
XmTHERMOMETER and the Scale scrollbar is
sensitive to user input (XmNeditable is True.

XmTHUMB_MARK
Specifies the slider as a series of three etched
lines centered in the middle of the slider.

XmNslidingMode
Specifies the mode the slider works in. There are two
possible modes:

XmSLIDER Allows the slider to move freely between the
minimum and maximum ends of the scale. This is
the default value.

XmTHERMOMETER
Forces the slider to be anchored to one side of
the trough area.

XmNsliderVisual
Specifies the color of the slider visual. This resource
can take the following values:

XmBACKGROUND_COLOR
Specifies that the slider visual is in the
background color.

XmFOREGROUND_COLOR
Specifies that the slider visual is in the
foreground color.

XmSHADOWED_BACKGROUND
Specifies that the slider visual is in the
background color, with a shadow. This is the
default when the XmNslidingModel resource is
XmSLIDER.

XmTROUGH_COLOR
Specifies that the slider visual is in the trough
color. This is the default when the
XmNslidingModel resource is XmTHERMOMETER.

XmNtitleString
Specifies the title text string to appear in the Scale
widget window.

XmNvalue Specifies the slider's current position along the scale,
between XmNminimum and XmNmaximum. The value is
constrained to be within these inclusive bounds. The
initial value of this resource is the larger of 0 (zero)
and XmNminimum.

XmNvalueChangedCallback
Specifies the list of callbacks that is called when the
value of the slider has changed. The reason sent by the
callback is XmCR_VALUE_CHANGED.

Inherited Resources

Callback Information

A pointer to the following structure is passed to the XmNdragCallback
and XmNvalueChangedCallback procedures:

typedef struct
{
int reason;
XEvent * event;
int value;
} XmScaleCallbackStruct;

reason Indicates why the callback was invoked

event Points to the XEvent that triggered the callback

value Is the new slider value

A pointer to the following structure is passed to the
XmNconvertCallback procedures:

typedef struct
{
int reason;
XEvent *event;
Atom selection;
Atom target;
XtPointer source_data;
XtPointer location_data;
int flags;
XtPointer parm;
int parm_format;
unsigned long parm_length;
int status;
XtPointer value;
Atom type;
int format;
unsigned long length;
} XmConvertCallbackStruct;

reason Indicates why the callback was invoked.

event Points to the XEvent that triggered the callback. It can
be NULL.

selection Indicates the selection for which conversion is being
requested. Possible values are CLIPBOARD, PRIMARY,
SECONDARY, and _MOTIF_DROP.

target Indicates the conversion target.

source_data
Contains information about the selection source. When the
selection is _MOTIF_DROP, source_data is the DragContext.
Otherwise, it is NULL.

location_data
Contains information about the location of data to be
converted. If the value is NULL, the data to be
transferred consists of the widget's current selection.

flags Indicates the status of the conversion. Following are the
possible values:

XmCONVERTING_NONE
This flag is currently unused.

XmCONVERTING_PARTIAL
The target widget was able to be converted, but
some data was lost.

XmCONVERTING_SAME
The conversion target is the source of the data
to be transferred.

XmCONVERTING_TRANSACT
This flag is currently unused.

parm Contains parameter data for this target. If no parameter
data exists, the value is NULL.

When selection is CLIPBOARD and target is
_MOTIF_CLIPBOARD_TARGETS or
_MOTIF_DEFERRED_CLIPBOARD_TARGETS, the value is the
requested operation (XmCOPY, XmMOVE, or XmLINK).

parm_format
Specifies whether the data in parm should be viewed as a
list of char, short, or long quantities. Possible values
are 0 (when parm is NULL), 8 (when the data in parm should
be viewed as a list of chars), 16 (when the data in parm
should be viewed as a list of shorts), or 32 (when the data
in parm should be viewed as a list of longs). Note that
parm_format symbolizes a data type, not the number of bits
in each list element. For example, on some machines, a
parm_format of 32 means that the data in parm should be
viewed as a list of 64-bit quantities, not 32-bit
quantities.

parm_length
Specifies the number of elements of data in parm, where
each element has the size specified by parm_format. When
parm is NULL, the value is 0.

status An IN/OUT member that specifies the status of the
conversion. The initial value is XmCONVERT_DEFAULT. The
callback procedure can set this member to one of the
following values:

XmCONVERT_DEFAULT
This value means that the widget class conversion
procedure, if any, is called after the callback
procedures return. If the widget class
conversion procedure produces any data, it
overwrites the data provided by the callback
procedures in the value member.

XmCONVERT_MERGE
This value means that the widget class conversion
procedure, if any, is called after the callback
procedures return. If the widget class
conversion procedure produces any data, it
appends its data to the data provided by the
callback procedures in the value member. This
value is intended for use with targets that
result in lists of data, such as TARGETS.

XmCONVERT_DONE
This value means that the callback procedure has
successfully finished the conversion. The widget
class conversion procedure, if any, is not called
after the callback procedures return.

XmCONVERT_REFUSE
This value means that the callback procedure has
terminated the conversion process without
completing the requested conversion. The widget
class conversion procedure, if any, is not called
after the callback procedures return.

value An IN/OUT parameter that contains any data that the
callback procedure produces as a result of the conversion.
The initial value is NULL. If the callback procedure sets
this member, it must ensure that the type, format, and
length members correspond to the data in value. The
callback procedure is responsible for allocating, but not
for freeing, memory when it sets this member.

type An IN/OUT parameter that indicates the type of the data in
the value member. The initial value is INTEGER.

format An IN/OUT parameter that specifies whether the data in
value should be viewed as a list of char, short, or long
quantities. The initial value is 8. The callback
procedure can set this member to 8 (for a list of char), 16
(for a list of short), or 32 (for a list of long).

length An IN/OUT member that specifies the number of elements of
data in value, where each element has the size symbolized
by format. The initial value is 0.

Behavior

XmScale has the following behavior:

<Btn1Down> or <Btn2Down>:
In the region between an end of the Scale and the slider:
Moves the slider by one multiple increment in the direction
of the end of the Scale and calls the
XmNvalueChangedCallback callbacks. If
XmNprocessingDirection is XmMAX_ON_RIGHT or
XmMAX_ON_BOTTOM, movement toward the right or bottom
increments the Scale value, and movement toward the left or
top decrements the Scale value. If XmNprocessingDirection
is XmMAX_ON_LEFT or XmMAX_ON_TOP, movement toward the right
or bottom decrements the Scale value, and movement toward
the left or top increments the Scale value. If the button
is held down longer than a delay period, the slider is
moved again by the same increment and the same callbacks
are called.

In slider: Activates the interactive dragging of the
slider.

<Btn2Down> in value label:
Drags the contents of the label showing the current slider
value. This action sets the XmNconvertProc of the
DragContext to a function that calls the XmNconvertCallback
procedures, possibly multiple times, for the _MOTIF_DROP
selection.

<Btn1Motion> or <Btn2Motion>:
If the button press occurs within the slider, the
subsequent motion events move the slider to the position of
the pointer and call the callbacks for XmNdragCallback.

<Btn1Up> or <Btn2Up>:
If the button press occurs within the slider and the slider
position is changed, the callbacks for
XmNvalueChangedCallback are called.

<Ctrl><Btn1Down>:
In the region between an end of the Scale and the slider:
Moves the slider to that end of the Scale and calls the
XmNvalueChangedCallback callbacks. If
XmNprocessingDirection is XmMAX_ON_RIGHT or
XmMAX_ON_BOTTOM, movement toward the right or bottom
increments the Scale value, and movement toward the left or
top decrements the Scale value. If XmNprocessingDirection
is XmMAX_ON_LEFT or XmMAX_ON_TOP, movement toward the right
or bottom decrements the Scale value, and movement toward
the left or top increments the Scale value.

<Key><osfUp>:
For vertical Scales, moves the slider up one increment and
calls the XmNvalueChangedCallback callbacks. If
XmNprocessingDirection is XmMAX_ON_TOP, movement toward the
top increments the Scale value. If XmNprocessingDirection
is XmMAX_ON_BOTTOM, movement toward the top decrements the
Scale value.

<Key><osfDown>:
For vertical Scales, moves the slider down one increment
and calls the XmNvalueChangedCallback callbacks. If
XmNprocessingDirection is XmMAX_ON_BOTTOM, movement toward
the bottom increments the Scale value. If
XmNprocessingDirection is XmMAX_ON_TOP, movement toward the
bottom decrements the Scale value.

<Key><osfLeft>:
For horizontal Scales, moves the slider one increment to
the left and calls the XmNvalueChangedCallback callbacks.
If XmNprocessingDirection is XmMAX_ON_LEFT, movement toward
the left increments the Scale value. If
XmNprocessingDirection is XmMAX_ON_RIGHT, movement toward
the left decrements the Scale value.

<Key><osfRight>:
For horizontal Scales, moves the slider one increment to
the right and calls the XmNvalueChangedCallback callbacks.
If XmNprocessingDirection is XmMAX_ON_RIGHT, movement
toward the right increments the Scale value. If
XmNprocessingDirection is XmMAX_ON_LEFT, movement toward
the right decrements the Scale value.

<Ctrl><Key><osfUp> or <Key><osfPageUp>:
For vertical Scales, moves the slider up one multiple
increment and calls the XmNvalueChangedCallback callbacks.
If XmNprocessingDirection is XmMAX_ON_TOP, movement toward
the top increments the Scale value. If
XmNprocessingDirection is XmMAX_ON_BOTTOM, movement toward
the top decrements the Scale value.

<Ctrl><Key><osfDown> or <Key><osfPageDown>:
For vertical Scales, moves the slider down one multiple
increment and calls the XmNvalueChangedCallback callbacks.
If XmNprocessingDirection is XmMAX_ON_BOTTOM, movement
toward the bottom increments the Scale value. If
XmNprocessingDirection is XmMAX_ON_TOP, movement toward the
bottom decrements the Scale value.

<Ctrl><Key><osfLeft> or <Key><osfPageLeft>:
For horizontal Scales, moves the slider one multiple
increment to the left and calls the XmNvalueChangedCallback
callbacks. If XmNprocessingDirection is XmMAX_ON_LEFT,
movement toward the left increments the Scale value. If
XmNprocessingDirection is XmMAX_ON_RIGHT, movement toward
the left decrements the Scale value.

<Ctrl><Key><osfRight> or <Key><osfPageRight>:
For horizontal Scales, moves the slider one multiple
increment to the right and calls the
XmNvalueChangedCallback callbacks. If
XmNprocessingDirection is XmMAX_ON_RIGHT, movement toward
the right increments the Scale value. If
XmNprocessingDirection is XmMAX_ON_LEFT, movement toward
the right decrements the Scale value.

<Key><osfBeginLine> or <Key><osfBeginData>:
Moves the slider to the minimum value and calls the
XmNvalueChangedCallback callbacks.

<Key><osfEndLine> or <Key><osfEndData>:
Moves the slider to the maximum value and calls the
XmNvalueChangedCallback callbacks.

<Key><osfNextField>:
Traverses to the first item in the next tab group. If the
current tab group is the last entry in the tab group list,
it wraps to the beginning of the tab group list.

<Key><osfPrevField>:
Traverses to the first item in the previous tab group. If
the beginning of the tab group list is reached, it wraps to
the end of the tab group list.

<Key><osfHelp>:
Calls the callbacks for XmNhelpCallback if any exist. If
there are no help callbacks for this widget, this action
calls the help callbacks for the nearest ancestor that has
them.

Virtual Bindings

The bindings for virtual keys are vendor specific. For information
about bindings for virtual buttons and keys, see VirtualBindings(3).

Composite(3), Constraint(3), Core(3), XmCreateScale(3), XmManager(3),
XmScaleGetValue(3), XmScaleSetValue(3), XmVaCreateScale(3), and
XmVaCreateManagedScale(3).

XmScale(library call)