Classes

The DtSpinBox widget inherits behavior and resources from the Core, Composite and XmManager classes.

Caret1The class pointer is dtSpinBoxWidgetClass.

The class name is DtSpinBoxWidget.

New Resources

The following table defines a set of widget resources used by the application to specify data. The application 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, the application must remove the DtN or DtC prefix and use the remaining letters. To specify one of the defined values for a resource in a .Xdefaults file, the application must remove the Dt prefix and use the remaining letters (in either lower case or upper case, but including 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).

DtNarrowLayout

Specifies the style and position of the SpinBox arrows. The following values are supported:

DtNarrowSensitivity

Specifies the sensitivity of the arrows in the DtSpinBox. The following values are supported:

DtNdecimalPoints

Specifies the position of the radix character within the numeric value when DtNspinBoxChildType is DtNUMERIC. This resource is used to allow for floating point values in the DtSpinBox widget.

DtNincrementValue

Specifies the amount to increment or decrement the DtNposition when the DtNspinBoxChildType is DtNUMERIC. When the Up action is activated, the DtNincrementValue is added to the DtNposition value; when the Down action is activated, the DtNincrementValue is subtracted from the DtNposition value. When DtNspinBoxChildType is DtSTRING, this resource is ignored.

DtNinitialDelay

Specifies the amount of time in milliseconds before the Arrow buttons will begin to spin continuously.

DtNnumValues

Specifies the number of items in the DtNvalues list when the DtNspinBoxChildType resource is DtSTRING. The value of this resource must be a positive integer. The DtNnumValues is maintained by the DtSpinBox widget when items are added or deleted from the DtNvalues list. When DtNspinBoxChildType is not DtSTRING, this resource is ignored.

DtNvalues

Supplies the list of strings to cycle through when the DtNspinButtonChildType resource is DtSTRING. When DtNspinBoxChildType is not DtSTRING, this resource is ignored.

DtNmaximumValue

Specifies the upper bound on the DtSpinBox's range when DtNspinBoxChildType is DtNUMERIC.

DtNminimumValue

Specifies the lower bound on the DtSpinBox's range when DtNspinBoxChildType is DtNUMERIC.

DtNmodifyVerifyCallback

Specifies the callback to be invoked just before the DtSpinBox position changes. The application can use this callback to implement new application-related logic (including setting new position spinning to, or canceling the impending action). For example, this callback can be used to stop the spinning just before wrapping at the upper and lower position boundaries. If the application sets the doit member of the DtSpinBoxCallbackStruct to False, nothing happens. Otherwise, the position changes. Reasons sent by the callback are DtCR_SPIN_NEXT, or DtCR_SPIN_PRIOR.

DtNposition

The DtNposition resource has a different value based on the DtNspinBoxChildType resource. When DtNspinBoxChildType is DtSTRING, the DtNposition is the index into the DtNvalues list for the current item. When the DtNspinBoxChildType resource is DtNUMERIC, the DtNposition is the integer value of the DtSpinBox that falls within the range of DtNmaximumValue and DtNminimumValue.

DtNrepeatDelay

Specifies the number of milliseconds between repeated calls to the DtNvalueChangedCallback while the user is spinning the DtSpinBox.

DtNspinBoxChildType

Specifies the style of the DtSpinBox. The following values are supported:

DtNvalueChangedCallback

Specifies the callback to be invoked whenever the value of the DtNposition resource is changed through the use of the spinner arrows. The DtNvalueChangedCallback passes the DtSpinBoxCallbackStruct call_data structure.

Inherited Resources

The DtSpinBox widget inherits behavior and resources from the following named superclasses. For a complete description of each resource, see the man page for that superclass.

Callback Information

A pointer to the following structure is passed to each DtSpinBox callback:

typedef struct {


        int             reason;


        XEvent          *event;


        Widget          widget;


        Boolean doit;


        int             position;


        XmString        value;


        Boolean crossed_boundary;
} DtSpinBoxCallbackStruct;

The reason argument indicates why the callback was invoked. There are three possible reasons for this callback to be issued. The reason is DtCR_OK when this is the first call to the callback at the beginning of a spin or if it is a single activation of the spin arrows. If the DtSpinBox is in the process of being continuously spun, then the reason will be DtCR_SPIN_NEXT or DtCR_SPIN_PRIOR, depending on the arrow that is spinning.

The event argument points to the XEvent that triggered the callback. It can be NULL when the DtSpinBox is continuously spinning.

The widget argument is the widget identifier for the text widget that has been affected by the spin.

The doit argument is set only when the call_data comes from the DtNmodifyVerifyCallback. It indicates that the action that caused the callback to be called should be performed. The action is not performed if doit is set to False.

The position argument is the new value of the DtNposition resource as a result of the spin.

The value argument is the new XmString value displayed in the Text widget as a result of the spin. The application must copy this string if it is used beyond the scope of the call_data structure.

The crossed_boundary argument is True when the spinbox cycles. This is the case when a DtNspinBoxChildType of DtSTRING wraps from the first item to the last or the last item to the first. In the case of the DtNspinBoxChildType of DtNUMERIC, the boundary is crossed when the DtSpinBox cycles from the maximum value to the minimum or vice versa.