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-.\" $Xorg: CH12,v 1.3 2000/08/17 19:42:47 cpqbld Exp $
-.\" Copyright \(co 1985, 1986, 1987, 1988, 1991, 1994
-.\" X Consortium
-.\"
-.\" Permission is hereby granted, free of charge, to any person obtaining
-.\" a copy of this software and associated documentation files (the
-.\" "Software"), to deal in the Software without restriction, including
-.\" without limitation the rights to use, copy, modify, merge, publish,
-.\" distribute, sublicense, and/or sell copies of the Software, and to
-.\" permit persons to whom the Software is furnished to do so, subject to
-.\" the following conditions:
-.\"
-.\" The above copyright notice and this permission notice shall be included
-.\" in all copies or substantial portions of the Software.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
-.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-.\" OTHER DEALINGS IN THE SOFTWARE.
-.\"
-.\" Except as contained in this notice, the name of the X Consortium shall
-.\" not be used in advertising or otherwise to promote the sale, use or
-.\" other dealings in this Software without prior written authorization
-.\" from the X Consortium.
-.\"
-.\" Copyright \(co 1985, 1986, 1987, 1988, 1991, 1994
-.\" Digital Equipment Corporation, Maynard, Massachusetts.
-.\"
-.\" Permission to use, copy, modify and distribute this documentation for any
-.\" purpose and without fee is hereby granted, provided that the above copyright
-.\" notice appears in all copies and that both that copyright notice and this
-.\" permission notice appear in supporting documentation, and that the name of
-.\" Digital not be used in in advertising or publicity pertaining
-.\" to distribution of the software without specific, written prior permission.
-.\" Digital makes no representations about the suitability of the
-.\" software described herein for any purpose.
-.\" It is provided ``as is'' without express or implied warranty.
-.\"
-\&
-.sp 1
-.ce 3
-\s+1\fBChapter 12\fP\s-1
-
-\s+1\fBNonwidget Objects\fP\s-1
-.sp 2
-.nr H1 12
-.nr H2 0
-.nr H3 0
-.nr H4 0
-.nr H5 0
-.LP
-.XS
-Chapter 12 \(em Nonwidget Objects
-.XE
-.LP
-Although widget writers are free to treat
-Core
-as the base class of
-the widget hierarchy, there are actually three classes above it.
-These classes are
-Object,
-RectObj
-(Rectangle Object), and (\fIunnamed\fP),
-and members of these classes
-are referred to generically as \fIobjects\fP. By convention, the term
-\fIwidget\fP refers only to objects that are a subclass of
-Core,
-and the term \fInonwidget\fP refers to objects that are not a subclass of
-Core.
-In the preceding portion of this specification, the interface
-descriptions indicate explicitly whether the generic \fIwidget\fP argument
-is restricted to particular subclasses of Object. Sections 12.2.5,
-12.3.5, and 12.5 summarize the permissible classes of the arguments to, and
-return values from, each of the \*(xI routines.
-
-.NH 2
-Data Structures
-.XS
-\*(SN Data Structures
-.XE
-.LP
-In order not to conflict with previous widget code, the data
-structures used by nonwidget objects do not follow all the same
-conventions as those for widgets. In particular, the class records
-are not composed of parts but instead are complete data structures
-with filler for the widget fields they do not use. This
-allows the static class initializers for existing widgets to remain
-unchanged.
-
-.NH 2
-Object Objects
-.XS
-\fB\*(SN Object Objects\fP
-.XE
-.LP
-.IN "Object" "" "@DEF@"
-The
-Object
-object contains the definitions of fields common to all
-objects. It encapsulates the mechanisms for resource management.
-All objects and widgets are members of subclasses of
-Object,
-which is defined by the
-.PN ObjectClassPart
-and
-.PN ObjectPart
-structures.
-
-.NH 3
-ObjectClassPart Structure
-.XS
-\*(SN ObjectClassPart Structure
-.XE
-.LP
-The common fields for all object classes are defined in the
-.PN ObjectClassPart
-structure. All fields have the same purpose,
-function, and restrictions as the corresponding fields in
-.PN CoreClassPart ;
-fields whose
-names are obj\fI\s+1n\s-1\fP for some integer \s+1\fIn\fP\s-1 are not
-used for Object,
-but exist to pad the data structure so that it matches Core's class
-record. The class record initialization must fill all
-obj\fI\s+1n\s-1\fP fields with NULL or zero as appropriate to the type.
-.LP
-.IN "ObjectClassPart" "" "@DEF@"
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-typedef struct _ObjectClassPart {
- WidgetClass superclass;
- String class_name;
- Cardinal widget_size;
- XtProc class_initialize;
- XtWidgetClassProc class_part_initialize;
- XtEnum class_inited;
- XtInitProc initialize;
- XtArgsProc initialize_hook;
- XtProc obj1;
- XtPointer obj2;
- Cardinal obj3;
- XtResourceList resources;
- Cardinal num_resources;
- XrmClass xrm_class;
- Boolean obj4;
- XtEnum obj5;
- Boolean obj6;
- Boolean obj7;
- XtWidgetProc destroy;
- XtProc obj8;
- XtProc obj9;
- XtSetValuesFunc set_values;
- XtArgsFunc set_values_hook;
- XtProc obj10;
- XtArgsProc get_values_hook;
- XtProc obj11;
- XtVersionType version;
- XtPointer callback_private;
- String obj12;
- XtProc obj13;
- XtProc obj14;
- XtPointer extension;
-} ObjectClassPart;
-.De
-.LP
-.eM
-The extension record defined for
-.PN ObjectClassPart
-with a \fIrecord_type\fP equal to
-.PN \s-1NULLQUARK\s+1
-is
-.PN ObjectClassExtensionRec .
-.LP
-.IN "ObjectClassExtensionRec" "" "@DEF@"
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-typedef struct {
- XtPointer next_extension; See Section 1.6.12
- XrmQuark record_type; See Section 1.6.12
- long version; See Section 1.6.12
- Cardinal record_size; See Section 1.6.12
- XtAllocateProc allocate; See Section 2.5.5.
- XtDeallocateProc deallocate; See Section 2.8.4.
-} ObjectClassExtensionRec, *ObjectClassExtension;
-.De
-.LP
-.eM
-The prototypical
-.PN ObjectClass
-consists of just the
-.PN ObjectClassPart .
-.LP
-.IN "ObjectClassRec" "" "@DEF@"
-.IN "ObjectClass" "" "@DEF@"
-.IN "objectClass" "" "@DEF@"
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-typedef struct _ObjectClassRec {
- ObjectClassPart object_class;
-} ObjectClassRec, *ObjectClass;
-.De
-.LP
-.eM
-The predefined class record and pointer for
-.PN ObjectClassRec
-are
-.LP
-In
-.PN IntrinsicP.h :
-.sM
-.Ds 0
-extern ObjectClassRec objectClassRec;
-.De
-.LP
-.eM
-In
-.PN Intrinsic.h :
-.sM
-.Ds 0
-extern WidgetClass objectClass;
-.De
-.LP
-.eM
-The opaque types
-.PN Object
-and
-.PN ObjectClass
-and the opaque variable
-.PN objectClass
-are defined for generic actions on objects.
-The symbolic constant for the
-.PN ObjectClassExtension
-version identifier is
-.PN XtObjectExtensionVersion
-(see Section 1.6.12).
-.PN Intrinsic.h
-uses an incomplete structure definition to ensure that the
-compiler catches attempts to access private data:
-.LP
-.sM
-.Ds 0
-typedef struct _ObjectClassRec* ObjectClass;
-.De
-.LP
-.eM
-
-.NH 3
-ObjectPart Structure
-.XS
-\*(SN ObjectPart Structure
-.XE
-.LP
-The common fields for all object instances are defined in the
-.PN ObjectPart
-structure. All fields have the same meaning as the
-corresponding fields in
-.PN CorePart .
-.LP
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-.IN "ObjectPart" "" "@DEF@"
-typedef struct _ObjectPart {
- Widget self;
- WidgetClass widget_class;
- Widget parent;
- Boolean being_destroyed;
- XtCallbackList destroy_callbacks;
- XtPointer constraints;
-} ObjectPart;
-.De
-.LP
-.eM
-All object instances have the
-Object
-fields as their first component. The prototypical type
-.PN Object
-is defined with only this set of fields.
-Various routines can cast object pointers, as needed, to specific
-object types.
-.LP
-In
-.PN IntrinsicP.h :
-.LP
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-typedef struct _ObjectRec {
- ObjectPart object;
-} ObjectRec, *Object;
-.De
-.LP
-.eM
-.IN "ObjectRec" "" "@DEF@"
-In
-.PN Intrinsic.h :
-.LP
-.sM
-.Ds 0
-typedef struct _ObjectRec *Object;
-.De
-.LP
-.eM
-
-.NH 3
-Object Resources
-.XS
-\fB\*(SN Object Resources\fP
-.XE
-.LP
-The resource names, classes, and representation types specified in the
-.PN objectClassRec
-resource list are:
-.LP
-.TS
-lw(1.5i) lw(1.5i) lw(2.5i) .
-_
-.sp 6p
-Name Class Representation
-.sp 6p
-_
-.sp 6p
-XtNdestroyCallback XtCCallback XtRCallback
-.sp 6p
-_
-.TE
-
-.NH 3
-ObjectPart Default Values
-.XS
-\fB\*(SN ObjectPart Default Values\fP
-.XE
-.LP
-All fields in
-.PN ObjectPart
-have the same default values as the corresponding fields in
-.PN CorePart .
-
-.NH 3
-Object Arguments to \*(xI Routines
-.XS
-\*(SN Object Arguments to \*(xI Routines
-.XE
-.LP
-The WidgetClass arguments to the following procedures may be
-.PN objectClass
-or any subclass:
-.sp
-.IP
-.PN XtInitializeWidgetClass ,
-.PN XtCreateWidget ,
-.PN XtVaCreateWidget
-.IP
-.PN XtIsSubclass ,
-.PN XtCheckSubclass
-.IP
-.PN XtGetResourceList ,
-.PN XtGetConstraintResourceList
-.sp
-.LP
-The Widget arguments to the following procedures may be of class
-Object
-or any subclass:
-.sp
-.IP
-.PN XtCreateWidget ,
-.PN XtVaCreateWidget
-.IP
-.PN XtAddCallback ,
-.PN XtAddCallbacks ,
-.PN XtRemoveCallback ,
-.PN XtRemoveCallbacks ,
-.PN XtRemoveAllCallbacks ,
-.PN XtCallCallbacks ,
-.PN XtHasCallbacks ,
-.PN XtCallCallbackList
-.IP
-.PN XtClass ,
-.PN XtSuperclass ,
-.PN XtIsSubclass ,
-.PN XtCheckSubclass ,
-.PN XtIsObject ,
-.PN XtIsRectObj ,
-.PN XtIsWidget ,
-.PN XtIsComposite ,
-.PN XtIsConstraint ,
-.PN XtIsShell ,
-.PN XtIsOverrideShell ,
-.PN XtIsWMShell ,
-.PN XtIsVendorShell ,
-.PN XtIsTransientShell ,
-.PN XtIsToplevelShell ,
-.PN XtIsApplicationShell ,
-.PN XtIsSessionShell
-.IP
-.PN XtIsManaged ,
-.PN XtIsSensitive
-.br
-(both will return
-.PN False
-if argument is not a subclass of
-RectObj)
-.IP
-.PN XtIsRealized
-.br
-(returns the state of the nearest windowed ancestor
-if class of argument is not a subclass of
-Core)
-.IP
-.PN XtWidgetToApplicationContext
-.IP
-.PN XtDestroyWidget
-.IP
-.PN XtParent ,
-.PN XtDisplayOfObject ,
-.PN XtScreenOfObject ,
-.PN XtWindowOfObject
-.IP
-.PN XtSetKeyboardFocus
-(descendant)
-.IP
-.PN XtGetGC ,
-.PN XtReleaseGC
-.IP
-.PN XtName
-.IP
-.PN XtSetValues ,
-.PN XtGetValues ,
-.PN XtVaSetValues ,
-.PN XtVaGetValues
-.IP
-.PN XtGetSubresources ,
-.PN XtGetApplicationResources ,
-.PN XtVaGetSubresources ,
-.PN XtVaGetApplicationResources
-.IP
-.PN XtConvert ,
-.PN XtConvertAndStore
-.sp
-.LP
-The return value of the following procedures will be of class
-Object
-or a subclass:
-.sp
-.IP
-.PN XtCreateWidget ,
-.PN XtVaCreateWidget
-.IP
-.PN XtParent
-.IP
-.PN XtNameToWidget
-.sp
-.LP
-The return value of the following procedures will be
-.PN objectClass
-or a subclass:
-.sp
-.IP
-.PN XtClass ,
-.PN XtSuperclass
-
-.NH 3
-Use of Objects
-.XS
-\fB\*(SN Use of Objects\fP
-.XE
-.LP
-The
-Object
-class exists to enable programmers to use the \*(xI'
-classing and resource-handling mechanisms for things smaller
-and simpler than widgets.
-Objects make obsolete many common uses of subresources as described in
-Sections 9.4, 9.7.2.4, and 9.7.2.5.
-.LP
-Composite
-widget classes that wish to accept nonwidget children must
-set the \fIaccepts_objects\fP field in the
-.PN CompositeClassExtension
-structure to
-.PN True .
-.PN XtCreateWidget
-will otherwise generate an error message on an attempt to create a
-nonwidget child.
-.LP
-Of the classes defined by the \*(xI,
-ApplicationShell
-and
-SessionShell
-accept nonwidget children, and the class of any nonwidget child
-must not be
-.PN rectObjClass
-or any subclass. The intent of allowing
-Object
-children of
-ApplicationShell
-and
-SessionShell
-is to provide clients a simple mechanism
-for establishing the resource-naming root of an object hierarchy.
-
-.NH 2
-Rectangle Objects
-.XS
-\fB\*(SN Rectangle Objects\fP
-.XE
-.LP
-The class of rectangle objects is a subclass of
-Object
-that represents
-rectangular areas. It encapsulates the mechanisms for geometry
-management and is called RectObj
-.IN "RectObj" "" "@DEF@"
-to avoid conflict with the Xlib
-.PN Rectangle
-data type.
-
-.NH 3
-RectObjClassPart Structure
-.XS
-\*(SN RectObjClassPart Structure
-.XE
-.LP
-As with the
-.PN ObjectClassPart
-structure, all fields in the
-.PN RectObjClassPart
-structure have the same
-purpose and function as the corresponding fields in
-.PN CoreClassPart ;
-fields whose names are rect\fI\s+1n\s-1\fP for some integer
-\fI\s+1n\s-1\fP are not used for
-RectObj, but exist to pad the data structure so that it matches
-Core's
-class record. The class record initialization must fill all
-rect\fI\s+1n\s-1\fP fields with NULL or zero as appropriate to the type.
-.LP
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-.IN "RectObjClassPart" "" "@DEF@"
-typedef struct _RectObjClassPart {
- WidgetClass superclass;
- String class_name;
- Cardinal widget_size;
- XtProc class_initialize;
- XtWidgetClassProc class_part_initialize;
- XtEnum class_inited;
- XtInitProc initialize;
- XtArgsProc initialize_hook;
- XtProc rect1;
- XtPointer rect2;
- Cardinal rect3;
- XtResourceList resources;
- Cardinal num_resources;
- XrmClass xrm_class;
- Boolean rect4;
- XtEnum rect5;
- Boolean rect6;
- Boolean rect7;
- XtWidgetProc destroy;
- XtWidgetProc resize;
- XtExposeProc expose;
- XtSetValuesFunc set_values;
- XtArgsFunc set_values_hook;
- XtAlmostProc set_values_almost;
- XtArgsProc get_values_hook;
- XtProc rect9;
- XtVersionType version;
- XtPointer callback_private;
- String rect10;
- XtGeometryHandler query_geometry;
- XtProc rect11;
- XtPointer extension ;
-} RectObjClassPart;
-.De
-.LP
-.eM
-The
-RectObj
-class record consists of just the
-.PN RectObjClassPart .
-.LP
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-.IN "RectObjClassRec" "" "@DEF@"
-.IN "RectObjClass" "" "@DEF@"
-typedef struct _RectObjClassRec {
- RectObjClassPart rect_class;
-} RectObjClassRec, *RectObjClass;
-.De
-.LP
-.eM
-The predefined class record and pointer for
-.PN RectObjClassRec
-are
-.LP
-In
-.PN Intrinsic.h :
-.LP
-.sM
-.Ds 0
-extern RectObjClassRec rectObjClassRec;
-.De
-.LP
-.eM
-In
-.PN Intrinsic.h :
-.LP
-.sM
-.Ds 0
-extern WidgetClass rectObjClass;
-.De
-.LP
-.eM
-The opaque types
-.PN RectObj
-and
-.PN RectObjClass
-and the opaque variable
-.PN rectObjClass
-are defined for generic actions on objects
-whose class is RectObj or a subclass of
-RectObj.
-.PN Intrinsic.h
-uses an incomplete structure definition to ensure that the compiler
-catches attempts to access private data:
-.LP
-.sM
-.Ds 0
-typedef struct _RectObjClassRec* RectObjClass;
-.De
-.LP
-.eM
-
-.NH 3
-RectObjPart Structure
-.XS
-\*(SN RectObjPart Structure
-.XE
-.LP
-In addition to the
-.PN ObjectPart
-fields,
-RectObj
-objects have the following fields defined in the
-.PN RectObjPart
-structure. All fields have the same meaning as the corresponding field in
-.PN CorePart .
-.LP
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-.IN "RectObjPart" "" "@DEF@"
-typedef struct _RectObjPart {
- Position x, y;
- Dimension width, height;
- Dimension border_width;
- Boolean managed;
- Boolean sensitive;
- Boolean ancestor_sensitive;
-} RectObjPart;
-.De
-.LP
-.eM
-RectObj
-objects have the RectObj fields immediately following the Object fields.
-.LP
-.sM
-.Ds 0
-.TA .5i 3i
-.ta .5i 3i
-.IN "RectObjRec" "" "@DEF@"
-typedef struct _RectObjRec {
- ObjectPart object;
- RectObjPart rectangle;
-} RectObjRec, *RectObj;
-.De
-.LP
-.eM
-In
-.PN Intrinsic.h :
-.LP
-.sM
-.Ds 0
-typedef struct _RectObjRec* RectObj;
-.De
-.LP
-.eM
-
-.NH 3
-RectObj Resources
-.XS
-\fB\*(SN RectObj Resources\fP
-.XE
-.LP
-The resource names, classes, and representation types that are specified in the
-.PN rectObjClassRec
-resource list are:
-.TS
-lw(1.5i) lw(1.5i) lw(2.5i) .
-_
-.sp 6p
-Name Class Representation
-.sp 6p
-_
-.sp 6p
-XtNancestorSensitive XtCSensitive XtRBoolean
-XtNborderWidth XtCBorderWidth XtRDimension
-XtNheight XtCHeight XtRDimension
-XtNsensitive XtCSensitive XtRBoolean
-XtNwidth XtCWidth XtRDimension
-XtNx XtCPosition XtRPosition
-XtNy XtCPosition XtRPosition
-.sp 6p
-_
-.TE
-
-.NH 3
-RectObjPart Default Values
-.XS
-\fB\*(SN RectObjPart Default Values\fP
-.XE
-.LP
-All fields in
-.PN RectObjPart
-have the same default values as the corresponding fields in
-.PN CorePart .
-
-.NH 3
-Widget Arguments to \*(xI Routines
-.XS
-\fB\*(SN Widget Arguments to \*(xI Routines\fP
-.XE
-.LP
-The WidgetClass arguments to the following procedures may be
-.PN rectObjClass
-or any subclass:
-.sp
-.IP
-.PN XtCreateManagedWidget ,
-.PN XtVaCreateManagedWidget
-.sp
-.LP
-The Widget arguments to the following procedures may be of class
-RectObj
-or any subclass:
-.sp
-.IP
-.PN XtConfigureWidget ,
-.PN XtMoveWidget ,
-.PN XtResizeWidget
-.IP
-.PN XtMakeGeometryRequest ,
-.PN XtMakeResizeRequest
-.IP
-.PN XtManageChildren ,
-.PN XtManageChild ,
-.PN XtUnmanageChildren ,
-.PN XtUnmanageChild ,
-.PN XtChangeManagedSet
-.IP
-.PN XtQueryGeometry
-.IP
-.PN XtSetSensitive
-.IP
-.PN XtTranslateCoords
-.sp
-.LP
-The return value of the following procedures will be of class
-RectObj
-or a subclass:
-.sp
-.IP
-.PN XtCreateManagedWidget ,
-.PN XtVaCreateManagedWidget
-
-.NH 3
-Use of Rectangle Objects
-.XS
-\*(SN Use of Rectangle Objects
-.XE
-.LP
-RectObj
-can be subclassed to provide widgetlike objects (sometimes
-called gadgets) that do not use windows and do not have those
-features that are seldom used in simple widgets. This can save memory
-resources both in the server and in applications
-but requires additional support code in the parent.
-In the following
-discussion, \fIrectobj\fP refers only to objects
-whose class is RectObj or a subclass of
-RectObj,
-but not Core or a subclass of
-Core.
-.LP
-Composite
-widget classes that wish to accept rectobj children must set
-the \fIaccepts_objects\fP field in the
-.PN CompositeClassExtension
-extension structure to
-.PN True .
-.PN XtCreateWidget
-or
-.PN XtCreateManagedWidget
-will otherwise generate an error if called to create a nonwidget child.
-If the composite widget supports only children of class
-RectObj
-or a subclass (i.e., not of the general Object class), it
-must declare an insert_child procedure and check the subclass of each
-new child in that procedure. None of the classes defined by the
-\*(xI accept rectobj children.
-.LP
-If gadgets are defined in an object set, the parent is responsible for
-much more than the parent of a widget. The parent must request and handle
-input events that occur for the gadget and is responsible for making
-sure that when it receives an exposure event the gadget children get
-drawn correctly.
-Rectobj children may
-have expose procedures
-specified in their class records, but the parent is free to
-ignore them, instead drawing the contents of the child itself. This
-can potentially save graphics context switching. The precise contents
-of the exposure event and region arguments to the RectObj expose
-procedure are not specified by the \*(xI; a particular rectangle object is
-free to define the coordinate system origin (self-relative or
-parent-relative) and whether or not the rectangle or region is assumed to
-have been intersected with the visible region of the object.
-.LP
-In general, it is expected that a composite widget that accepts
-nonwidget children will document those children it is able to handle,
-since a gadget cannot be viewed as a completely self-contained entity,
-as can a widget. Since a particular composite widget class is usually
-designed to handle nonwidget children of only a limited set of classes, it should
-check the classes of newly added children in its insert_child
-procedure to make sure that it can deal with them.
-.LP
-The \*(xI will clear areas of a parent window obscured by
-rectobj children, causing exposure events, under the following
-circumstances:
-.IP \(bu 5
-A rectobj child is managed or unmanaged.
-.IP \(bu 5
-In a call to
-.PN XtSetValues
-on a rectobj child, one or more of the set_values procedures returns
-.PN True .
-.IP \(bu 5
-In a call to
-.PN XtConfigureWidget
-on a rectobj child, areas will
-be cleared corresponding to both the old and the new child
-geometries, including the border, if the geometry changes.
-.IP \(bu 5
-In a call to
-.PN XtMoveWidget
-on a rectobj child, areas will be
-cleared corresponding to both the old and the new child
-geometries, including the border, if the geometry changes.
-.IP \(bu 5
-In a call to
-.PN XtResizeWidget
-on a rectobj child, a single
-rectangle will be cleared corresponding to the larger of the
-old and the new child geometries if they are different.
-.IP \(bu 5
-In a call to
-.PN XtMakeGeometryRequest
-(or
-.PN XtMakeResizeRequest )
-on a rectobj child with
-.PN XtQueryOnly
-not set, if the manager returns
-.PN XtGeometryYes ,
-two rectangles will be cleared corresponding to both the old and
-the new child geometries.
-.LP
-Stacking order is not supported for rectobj children. Composite widgets with
-rectobj children are free to define any semantics desired if the child
-geometries overlap, including making this an error.
-.LP
-When a rectobj is playing the role of a widget, developers must be
-reminded to avoid making assumptions about the object passed in the
-Widget argument to a callback procedure.
-
-.NH 2
-Undeclared Class
-.XS
-\*(SN Undeclared Class
-.XE
-.LP
-The \*(xI define an unnamed class between
-RectObj
-and
-Core
-for possible future use by the X Consortium. The only assumptions that
-may be made about the unnamed class are
-.IP \(bu 5
-The \fIcore_class.superclass\fP field of
-.PN coreWidgetClassRec
-contains a pointer to the unnamed class record.
-.IP \(bu 5
-A pointer to the unnamed class record when dereferenced as an
-.PN ObjectClass
-will contain a pointer to
-.PN rectObjClassRec
-in its \fIobject_class.superclass\fP field.
-.LP
-Except for the above, the contents of the class record for this class
-and the result of an attempt to subclass or to create a widget of this
-unnamed class are undefined.
-
-.NH 2
-Widget Arguments to \*(xI Routines
-.XS
-\*(SN Widget Arguments to \*(xI Routines
-.XE
-.LP
-The WidgetClass arguments to the following procedures must be of class
-Shell
-or a subclass:
-.sp
-.IP
-.PN XtCreatePopupShell ,
-.PN XtVaCreatePopupShell ,
-.PN XtAppCreateShell ,
-.PN XtVaAppCreateShell ,
-.PN XtOpenApplication ,
-.PN XtVaOpenApplication
-.sp
-.LP
-The Widget arguments to the following procedures must be of class
-Core
-or any subclass:
-.sp
-.IP
-.PN XtCreatePopupShell ,
-.PN XtVaCreatePopupShell
-.IP
-.PN XtAddEventHandler ,
-.PN XtAddRawEventHandler ,
-.PN XtRemoveEventHandler ,
-.br
-.PN XtRemoveRawEventHandler ,
-.PN XtInsertEventHandler ,
-.PN XtInsertRawEventHandler
-.br
-.PN XtInsertEventTypeHandler ,
-.PN XtRemoveEventTypeHandler ,
-.IP
-.PN XtRegisterDrawable
-.PN XtDispatchEventToWidget
-.IP
-.PN XtAddGrab ,
-.PN XtRemoveGrab ,
-.PN XtGrabKey ,
-.PN XtGrabKeyboard ,
-.PN XtUngrabKey ,
-.PN XtUngrabKeyboard ,
-.PN XtGrabButton ,
-.PN XtGrabPointer ,
-.PN XtUngrabButton ,
-.br
-.PN XtUngrabPointer
-.IP
-.PN XtBuildEventMask
-.IP
-.PN XtCreateWindow ,
-.PN XtDisplay ,
-.PN XtScreen ,
-.PN XtWindow
-.IP
-.PN XtNameToWidget
-.IP
-.PN XtGetSelectionValue ,
-.PN XtGetSelectionValues ,
-.PN XtOwnSelection ,
-.PN XtDisownSelection ,
-.PN XtOwnSelectionIncremental ,
-.PN XtGetSelectionValueIncremental ,
-.PN XtGetSelectionValuesIncremental ,
-.br
-.PN XtGetSelectionRequest
-.IP
-.PN XtInstallAccelerators ,
-.PN XtInstallAllAccelerators
-(both destination and source)
-.IP
-.PN XtAugmentTranslations ,
-.PN XtOverrideTranslations ,
-.PN XtUninstallTranslations ,
-.br
-.PN XtCallActionProc
-.IP
-.PN XtMapWidget ,
-.PN XtUnmapWidget
-.IP
-.PN XtRealizeWidget ,
-.PN XtUnrealizeWidget
-.IP
-.PN XtSetMappedWhenManaged
-.IP
-.PN XtCallAcceptFocus ,
-.PN XtSetKeyboardFocus
-(subtree)
-.IP
-.PN XtResizeWindow
-.IP
-.PN XtSetWMColormapWindows
-.sp
-.LP
-The Widget arguments to the following procedures must be of class
-Composite
-or any subclass:
-.sp
-.IP
-.PN XtCreateManagedWidget ,
-.PN XtVaCreateManagedWidget
-.sp
-.LP
-The Widget arguments to the following procedures must be of a subclass of
-Shell:
-.sp
-.IP
-.PN XtPopdown ,
-.PN XtCallbackPopdown ,
-.PN XtPopup ,
-.PN XtCallbackNone ,
-.PN XtCallbackNonexclusive ,
-.PN XtCallbackExclusive ,
-.PN XtPopupSpringLoaded
-.sp
-.LP
-The return value of the following procedure will be of class
-Core
-or a subclass:
-.sp
-.IP
-.PN XtWindowToWidget
-.sp
-.LP
-The return value of the following procedures will be of a subclass of
-Shell:
-.sp
-.IP
-.PN XtAppCreateShell ,
-.PN XtVaAppCreateShell ,
-.PN XtAppInitialize ,
-.PN XtVaAppInitialize ,
-.PN XtCreatePopupShell ,
-.PN XtVaCreatePopupShell
-.bp