Gadget is a widget class used as
a supporting superclass for other
gadget classes. It handles shadow-border drawing and highlighting, traversal
activation and deactivation, and various callback lists needed by
gadgets.
The color and pixmap resources defined by XmManager are directly used by
gadgets. If XtSetValues is used
to change one of the resources for a manager
widget, all of the gadget children within the manager also change.
Classes
Gadget inherits behavior and resources from Object and
RectObj classes.
The class pointer is xmGadgetClass.
The class name is XmGadget.
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).
XmGadget resource set
Name
Class
Type
Default
Access
XmNbottomShadowColor
XmCBottomShadowColor
Pixel
dynamic
G
XmNhelpCallback
XmCCallback
XtCallbackList
NULL
C
XmNhighlightColor
XmCHighlightColor
Pixel
dynamic
G
XmNhighlightOnEnter
XmCHighlightOnEnter
Boolean
False
CSG
XmNhighlightThickness
XmCHighlightThickness
Dimension
2
CSG
XmNnavigationType
XmCNavigationType
XmNavigationType
XmNONE
CSG
XmNshadowThickness
XmCShadowThickness
Dimension
2
CSG
XmNtopShadowColor
XmCTopShadowColor
Pixel
dynamic
G
XmNtraversalOn
XmCTraversalOn
Boolean
True
CSG
XmNunitType
XmCUnitType
unsigned char
dynamic
CSG
XmNuserData
XmCUserData
XtPointer
NULL
CSG
XmNbottomShadowColor
Contains the color to use to draw the bottom and right sides of the
border shadow.
XmNhelpCallback
Specifies the list of callbacks that is called when the help key sequence
is pressed. The reason sent by the callback is XmCR_HELP.
XmNhighlightColor
Contains the color of the highlighting rectangle.
XmNhighlightOnEnter
Specifies if 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 thickness of the highlighting rectangle.
XmNnavigationType
Determines whether the widget is a tab group.
XmNONE indicates that the widget is not a tab group.
XmTAB_GROUP indicates that the widget is a tab group, unless
another widget in the hierarchy has an XmNnavigationType of
XmEXCLUSIVE_TAB_GROUP.
XmSTICKY_TAB_GROUP indicates that the widget is a tab group, even
if another widget in the hierarchy has an XmNnavigationType of
XmEXCLUSIVE_TAB_GROUP.
XmEXCLUSIVE_TAB_GROUP indicates that the widget is a tab group and
that widgets in the hierarchy whose XmNnavigationType is
XmTAB_GROUP are not tab groups.
When a parent widget has an XmNnavigationType of
XmEXCLUSIVE_TAB_GROUP, traversal of non-tab-group widgets within
the group is based on the order of those widgets in their parent's
XmNchildren list.
When any widget in a hierarchy has an XmNnavigationType of
XmEXCLUSIVE_TAB_GROUP, traversal of tab groups in the hierarchy
proceeds to widgets in the order in which their XmNnavigationType
resources were specified as XmEXCLUSIVE_TAB_GROUP or
XmSTICKY_TAB_GROUP, whether by creating the widgets with that value,
by calling XtSetValues, or by calling XmAddTabGroup.
XmNshadowThickness
Specifies the size of the drawn border shadow.
XmNtopShadowColor
Contains the color to use to draw the top and left sides of the border
shadow.
XmNtraversalOn
Specifies traversal activation for this gadget.
XmNunitType
Provides the basic support for resolution independence.
It defines the type of units a widget uses with sizing and
positioning resources.
If the widget's parent is a subclass of XmManager and if the
XmNunitType resource is not explicitly set, it defaults to the
unit type of the parent widget.
If the widget's parent is not a subclass of XmManager, the
resource has a default unit type of XmPIXELS.
XmNunitType can have the following values:
XmPIXELS -- all values provided to the widget are treated as normal
pixel values.
Xm100TH_MILLIMETERS -- all values provided to the widget are treated
as 1/100 millimeter.
Xm1000TH_INCHES -- all values provided to the widget are treated as
1/1000 inch.
Xm100TH_POINTS -- all values provided to the widget are treated as
1/100 point. A point is a unit used in text processing
applications and is defined as 1/72 inch.
Xm100TH_FONT_UNITS -- all values provided to the widget are
treated as 1/100 of a font unit.
A font unit has horizontal and vertical components.
These are the values of the XmScreen resources XmNhorizontalFontUnit
and XmNverticalFontUnit.
XmNuserData
Allows the application to attach any necessary specific data to the gadget.
This is an internally unused resource.
Inherited resources
Gadget inherits the following resources from the named
superclass. For a complete description of each resource, refer to the
man page for that superclass.
RectObj resource set
Name
Class
Type
Default
Access
XmNancestorSensitive
XmCSensitive
Boolean
dynamic
G
XmNborderWidth
XmCBorderWidth
Dimension
0
CSG
XmNheight
XmCHeight
Dimension
dynamic
CSG
XmNsensitive
XmCSensitive
Boolean
True
CSG
XmNwidth
XmCWidth
Dimension
dynamic
CSG
XmNx
XmCPosition
Position
0
CSG
XmNy
XmCPosition
Position
0
CSG
Object resource set
Name
Class
Type
Default
Access
XmNdestroyCallback
XmCCallback
XtCallbackList
NULL
C
Callback information
A pointer to the following structure is passed to each callback:
typedef struct
{
int reason;
XEvent * event;
} XmAnyCallbackStruct;
reason
Indicates why the callback was invoked.
For this callback, reason is set to XmCR_HELP.
event
Points to the XEvent that triggered the callback.
Behavior
Gadgets cannot have translations associated with them.
Because of this, a Gadget's behavior is determined by the Manager
widget into which the Gadget is placed. If focus is on a Gadget,
events are passed to the Gadget by its Manager.