NAME

XtSetValues, XtSetSubvalues, XtGetValues, XtGetSubvalues - obtain and set widget resources

SYNTAX

void XtSetValues(w, args, num_args)
      Widget w;
      ArgList args;
      Cardinal num_args;

void XtSetSubvalues(base, resources, num_resources, args,
num_args)
      caddr_t base;
      XtResourceList resources;
      Cardinal num_resources;
      ArgList args;
      Cardinal num_args;

void XtGetValues(w, args, num_args)
      Widget w;
      ArgList args;
      Cardinal num_args;

void XtGetSubvalues(base, resources, num_resources, args,
num_args)
      caddr_t base;
      XtResourceList resources;
      Cardinal num_resources;
      ArgList args;
      Cardinal num_args;

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.

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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 con-
straintWidgetClass, XtSetValues also updates the widget's
constraints.  It starts with the constraint resources speci-
fied for constraintWidgetClass and proceeds down the sub-
class 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 adjust-
ments 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

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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 con-
straintWidgetClass, XtGetValues then fetches the values for
any constraint resources requested.  It starts with the con-
straint resources specified for constraintWidgetClass and
proceeds down to the subclass chain to the parent's con-
straint 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 XtGet-
Values.  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

XWIN 3.0               Last change: 9/1/88                 .ie t

XWIN 3.0               Last change: 9/1/88                 .ie t