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.

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:

For example,

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

XmNunitType can have the following values:

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.