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Table of Contents
XtSetValues, XtVaSetValues, XtSetSubvalues,
XtVaSetSubvalues, XtGetValues, XtVaGetValues, XtGetSubvalues, XtVaGetSubvalues
- obtain and set widget resources
- 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, ...);
and either the address into which
the resource value is to be stored or their new values
- args
- Specifies the
argument list of name/address pairs that contain the resource name.
- 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. ...
- Specifes the variable argument list of name/address pairs that
contain the resource name.
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.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
Table of Contents
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