NAME
XtSetValues, XtVaSetValues, XtSetSubvalues, XtVaSetSubvalues,
XtGetValues, XtVaGetValues, XtGetSubvalues, XtVaGetSubvalues - obtain
and set widget resources
SYNTAX
void XtSetValues(Widget w, ArgList args, Cardinal num_args);
void XtVaSetValues(Widget w, ...);
void XtSetSubvalues(XtPointer base, XtResourceList resources, Cardinal
num_resources, ArgList args, Cardinal num_args);
void XtVaSetSubvalues(XtPointer base, XtResourceList resources,
Cardinal num_resources, ...);
void XtGetValues(Widget w, ArgList args, Cardinal num_args);
void XtVaGetValues(Widget w, ...);
void XtGetSubvalues(XtPointer base, XtResourceList resources, Cardinal
num_resources, ArgList args, Cardinal num_args);
void XtVaGetSubvalues(XtPointer base, XtResourceList resources,
Cardinal num_resources, ...);
ARGUMENTS
args Specifies the argument list of name/address pairs that
contain the resource name and either the address into which
the resource value is to be stored or their new values.
base Specifies the base address of the subpart data structure
where the resources should be retrieved or written.
num_args Specifies the number of arguments in the argument list.
resources Specifies the nonwidget resource list or values.
num_resources
Specifies the number of resources in the resource list.
w Specifies the widget.
... Specifies the variable argument list of name/address pairs
that contain the resource name and either the address into
which the resource value is to be stored or their new values.
DESCRIPTION
The XtSetValues function starts with the resources specified for the
Core widget fields and proceeds down the subclass chain to the widget.
At each stage, it writes the new value (if specified by one of the
arguments) or the existing value (if no new value is specified) to a
new widget data record. XtSetValues then calls the set_values
procedures for the widget in superclass-to-subclass order. If the
widget has any non-NULL set_values_hook fields, these are called
immediately after the corresponding set_values procedure. This
procedure permits subclasses to set nonwidget data for XtSetValues.
If the widget’s parent is a subclass of constraintWidgetClass,
XtSetValues also updates the widget’s constraints. It starts with the
constraint resources specified for constraintWidgetClass and proceeds
down the subclass chain to the parent’s class. At each stage, it
writes the new value or the existing value to a new constraint record.
It then calls the constraint set_values procedures from
constraintWidgetClass down to the parent’s class. The constraint
set_values procedures are called with widget arguments, as for all
set_values procedures, not just the constraint record arguments, so
that they can make adjustments to the desired values based on full
information about the widget.
XtSetValues determines if a geometry request is needed by comparing the
current widget to the new widget. If any geometry changes are
required, it makes the request, and the geometry manager returns
XtGeometryYes, XtGeometryAlmost, or XtGeometryNo. If XtGeometryYes,
XtSetValues calls the widget’s resize procedure. If XtGeometryNo,
XtSetValues resets the geometry fields to their original values. If
XtGeometryAlmost, XtSetValues calls the set_values_almost procedure,
which determines what should be done and writes new values for the
geometry fields into the new widget. XtSetValues then repeats this
process, deciding once more whether the geometry manager should be
called.
Finally, if any of the set_values procedures returned True, XtSetValues
causes the widget’s expose procedure to be invoked by calling the Xlib
XClearArea function on the widget’s window.
The XtSetSubvalues function stores resources into the structure
identified by base.
The XtGetValues function starts with the resources specified for the
core widget fields and proceeds down the subclass chain to the widget.
The value field of a passed argument list should contain the address
into which to store the corresponding resource value. It is the
caller’s responsibility to allocate and deallocate this storage
according to the size of the resource representation type used within
the widget.
If the widget’s parent is a subclass of constraintWidgetClass,
XtGetValues then fetches the values for any constraint resources
requested. It starts with the constraint resources specified for
constraintWidgetClass and proceeds down to the subclass chain to the
parent’s constraint resources. If the argument list contains a
resource name that is not found in any of the resource lists searched,
the value at the corresponding address is not modified. Finally, if
the get_values_hook procedures are non-NULL, they are called in
superclass-to-subclass order after all the resource values have been
fetched by XtGetValues. This permits a subclass to provide nonwidget
resource data to XtGetValues.
The XtGetSubvalues function obtains resource values from the structure
identified by base.
SEE ALSO
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface