XmGadget (3)

#include <Xm/Xm.h>

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.

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).

XmNbackground

Specifies the background color for the gadget.

XmNbackgroundPixmap

Specifies a pixmap for tiling the background. The first tile is placed at the upper left corner of the widget's window.

XmNbottomShadowColor

Contains the color to use to draw the bottom and right sides of the border shadow.

XmNbottomShadowPixmap

Specifies the pixmap to use to draw the bottom and right sides of the border shadow.

XmNforeground

Specifies the foreground drawing color used by Primitive widgets.

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.

XmNhighlightPixmap

Specifies the pixmap used to draw the highlighting rectangle.

XmNhighlightThickness

Specifies the thickness of the highlighting rectangle.

XmNlayoutDirection

Specifies the direction in which components of the manager (including strings) are laid out. The values are of type XmDirection. If the widget's parent is a manager or shell, the value is inherited from the widget's parent. Otherwise, it is inherited from the closest ancestor vendor or menu shell.

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 the XmNnavigationType of another widget in the hierarchy is XmEXCLUSIVE_TAB_GROUP.

XmSTICKY_TAB_GROUP

Indicates that the widget is a tab group, even if the XmNnavigationType of another widget in the hierarchy is 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 the XmNnavigationType of any widget in a hierarchy is 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.

XmNtopShadowPixmap

Specifies the pixmap 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.

The unit type can also be specified in resource files, with the following format:

<floating value><unit>

• where:

  unit

  is <" ", pixels, inches, centimeters, millimeters, points, font units>

  pixels

  is <pix, pixel, pixels>

  inches

  is <in, inch, inches>

  centimeter

  is <cm, centimeter, centimeters>

  millimeters

  is <mm, millimeter, millimeters>

  points

  is <pt, point, points>

  font units

  is <fu, font_unit, font_units>

  float

  is {"+"|"-"}{{<"0"-"9">*}.}<"0"-"9">*

  Note that the type Dimension must always be positive.

• For example,

xmfonts*XmMainWindow.height: 10.4cm
*PostIn.width: 3inches

XmNunitType can have the following values:

XmPIXELS

All values provided to the widget are treated as normal pixel values.

XmMILLIMETERS

All values provided to the widget are treated as normal millimeter values.

Xm100TH_MILLIMETERS

All values provided to the widget are treated as 1/100 of a millimeter.

XmCENTIMETERS

All values provided to the widget are treated as normal centimeter values.

XmINCHES

All values provided to the widget are treated as normal inch values.

Xm1000TH_INCHES

All values provided to the widget are treated as 1/1000 of an inch.

XmPOINTS

All values provided to the widget are treated as normal point values. A point is a unit used in text processing applications and is defined as 1/72 of an inch.

Xm100TH_POINTS

All values provided to the widget are treated as 1/100 of a point. A point is a unit used in text processing applications and is defined as 1/72 inch.

XmFONT_UNITS

All values provided to the widget are treated as normal font units. A font unit has horizontal and vertical components. These are the values of the XmScreen resources XmNhorizontalFontUnit and XmNverticalFontUnit.

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.

XmNtoolTipString

The XmString to display as the toolTip. If this resource is NULL, no tip will be displayed. ToolTips are described in VendorShell(3)

Inherited Resources

Gadget inherits resources from the superclass described in the following table. For a complete description of each resource, refer to the reference page for that superclass.

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.

Object(3), RectObj(3), XmManager(3), and XmScreen(3).