1068 lines
23 KiB
Plaintext
1068 lines
23 KiB
Plaintext
.\" $Xorg: CH12,v 1.3 2000/08/17 19:42:47 cpqbld Exp $
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1991, 1994
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.\" X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1991, 1994
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.\" Digital Equipment Corporation, Maynard, Massachusetts.
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.\"
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.\" Permission to use, copy, modify and distribute this documentation for any
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.\" purpose and without fee is hereby granted, provided that the above copyright
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.\" notice appears in all copies and that both that copyright notice and this
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.\" permission notice appear in supporting documentation, and that the name of
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.\" Digital not be used in in advertising or publicity pertaining
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.\" to distribution of the software without specific, written prior permission.
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.\" Digital makes no representations about the suitability of the
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.\" software described herein for any purpose.
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.\" It is provided ``as is'' without express or implied warranty.
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.\"
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\&
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.sp 1
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.ce 3
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\s+1\fBChapter 12\fP\s-1
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\s+1\fBNonwidget Objects\fP\s-1
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.sp 2
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.nr H1 12
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.nr H2 0
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.nr H3 0
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.nr H4 0
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.nr H5 0
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.LP
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.XS
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Chapter 12 \(em Nonwidget Objects
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.XE
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.LP
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Although widget writers are free to treat
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Core
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as the base class of
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the widget hierarchy, there are actually three classes above it.
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These classes are
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Object,
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RectObj
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(Rectangle Object), and (\fIunnamed\fP),
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and members of these classes
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are referred to generically as \fIobjects\fP. By convention, the term
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\fIwidget\fP refers only to objects that are a subclass of
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Core,
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and the term \fInonwidget\fP refers to objects that are not a subclass of
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Core.
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In the preceding portion of this specification, the interface
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descriptions indicate explicitly whether the generic \fIwidget\fP argument
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is restricted to particular subclasses of Object. Sections 12.2.5,
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12.3.5, and 12.5 summarize the permissible classes of the arguments to, and
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return values from, each of the \*(xI routines.
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.NH 2
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Data Structures
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.XS
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\*(SN Data Structures
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.XE
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.LP
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In order not to conflict with previous widget code, the data
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structures used by nonwidget objects do not follow all the same
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conventions as those for widgets. In particular, the class records
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are not composed of parts but instead are complete data structures
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with filler for the widget fields they do not use. This
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allows the static class initializers for existing widgets to remain
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unchanged.
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.NH 2
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Object Objects
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.XS
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\fB\*(SN Object Objects\fP
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.XE
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.LP
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.IN "Object" "" "@DEF@"
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The
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Object
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object contains the definitions of fields common to all
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objects. It encapsulates the mechanisms for resource management.
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All objects and widgets are members of subclasses of
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Object,
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which is defined by the
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.PN ObjectClassPart
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and
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.PN ObjectPart
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structures.
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.NH 3
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ObjectClassPart Structure
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.XS
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\*(SN ObjectClassPart Structure
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.XE
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.LP
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The common fields for all object classes are defined in the
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.PN ObjectClassPart
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structure. All fields have the same purpose,
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function, and restrictions as the corresponding fields in
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.PN CoreClassPart ;
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fields whose
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names are obj\fI\s+1n\s-1\fP for some integer \s+1\fIn\fP\s-1 are not
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used for Object,
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but exist to pad the data structure so that it matches Core's class
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record. The class record initialization must fill all
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obj\fI\s+1n\s-1\fP fields with NULL or zero as appropriate to the type.
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.LP
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.IN "ObjectClassPart" "" "@DEF@"
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.sM
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.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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typedef struct _ObjectClassPart {
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WidgetClass superclass;
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String class_name;
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Cardinal widget_size;
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XtProc class_initialize;
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XtWidgetClassProc class_part_initialize;
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XtEnum class_inited;
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XtInitProc initialize;
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XtArgsProc initialize_hook;
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XtProc obj1;
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XtPointer obj2;
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Cardinal obj3;
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XtResourceList resources;
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Cardinal num_resources;
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XrmClass xrm_class;
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Boolean obj4;
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XtEnum obj5;
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Boolean obj6;
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Boolean obj7;
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XtWidgetProc destroy;
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XtProc obj8;
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XtProc obj9;
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XtSetValuesFunc set_values;
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XtArgsFunc set_values_hook;
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XtProc obj10;
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XtArgsProc get_values_hook;
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XtProc obj11;
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XtVersionType version;
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XtPointer callback_private;
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String obj12;
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XtProc obj13;
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XtProc obj14;
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XtPointer extension;
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} ObjectClassPart;
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.De
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.LP
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.eM
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The extension record defined for
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.PN ObjectClassPart
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with a \fIrecord_type\fP equal to
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.PN \s-1NULLQUARK\s+1
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is
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.PN ObjectClassExtensionRec .
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.LP
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.IN "ObjectClassExtensionRec" "" "@DEF@"
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.sM
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.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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typedef struct {
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XtPointer next_extension; See Section 1.6.12
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XrmQuark record_type; See Section 1.6.12
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long version; See Section 1.6.12
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Cardinal record_size; See Section 1.6.12
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XtAllocateProc allocate; See Section 2.5.5.
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XtDeallocateProc deallocate; See Section 2.8.4.
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} ObjectClassExtensionRec, *ObjectClassExtension;
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.De
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.LP
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.eM
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|
The prototypical
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.PN ObjectClass
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consists of just the
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.PN ObjectClassPart .
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.LP
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.IN "ObjectClassRec" "" "@DEF@"
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.IN "ObjectClass" "" "@DEF@"
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.IN "objectClass" "" "@DEF@"
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.sM
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.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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typedef struct _ObjectClassRec {
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ObjectClassPart object_class;
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} ObjectClassRec, *ObjectClass;
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.De
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.LP
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.eM
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|
The predefined class record and pointer for
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.PN ObjectClassRec
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are
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.LP
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|
In
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.PN IntrinsicP.h :
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.sM
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.Ds 0
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extern ObjectClassRec objectClassRec;
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.De
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.LP
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.eM
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|
In
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.PN Intrinsic.h :
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.sM
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.Ds 0
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extern WidgetClass objectClass;
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.De
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.LP
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.eM
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|
The opaque types
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.PN Object
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and
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.PN ObjectClass
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and the opaque variable
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.PN objectClass
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|
are defined for generic actions on objects.
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The symbolic constant for the
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.PN ObjectClassExtension
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|
version identifier is
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.PN XtObjectExtensionVersion
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(see Section 1.6.12).
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.PN Intrinsic.h
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uses an incomplete structure definition to ensure that the
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compiler catches attempts to access private data:
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.LP
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.sM
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.Ds 0
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typedef struct _ObjectClassRec* ObjectClass;
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.De
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.LP
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.eM
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|
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.NH 3
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ObjectPart Structure
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.XS
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\*(SN ObjectPart Structure
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.XE
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.LP
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|
The common fields for all object instances are defined in the
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.PN ObjectPart
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structure. All fields have the same meaning as the
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corresponding fields in
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.PN CorePart .
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.LP
|
|
.sM
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|
.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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.IN "ObjectPart" "" "@DEF@"
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typedef struct _ObjectPart {
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Widget self;
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WidgetClass widget_class;
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Widget parent;
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Boolean being_destroyed;
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XtCallbackList destroy_callbacks;
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XtPointer constraints;
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} ObjectPart;
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.De
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.LP
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.eM
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|
All object instances have the
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Object
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fields as their first component. The prototypical type
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.PN Object
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is defined with only this set of fields.
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Various routines can cast object pointers, as needed, to specific
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object types.
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.LP
|
|
In
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.PN IntrinsicP.h :
|
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.LP
|
|
.sM
|
|
.Ds 0
|
|
.TA .5i 3i
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|
.ta .5i 3i
|
|
typedef struct _ObjectRec {
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ObjectPart object;
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} ObjectRec, *Object;
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.De
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.LP
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.eM
|
|
.IN "ObjectRec" "" "@DEF@"
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|
In
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.PN Intrinsic.h :
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.LP
|
|
.sM
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|
.Ds 0
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|
typedef struct _ObjectRec *Object;
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.De
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.LP
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|
.eM
|
|
|
|
.NH 3
|
|
Object Resources
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.XS
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\fB\*(SN Object Resources\fP
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.XE
|
|
.LP
|
|
The resource names, classes, and representation types specified in the
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.PN objectClassRec
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|
resource list are:
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.LP
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|
.TS
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|
lw(1.5i) lw(1.5i) lw(2.5i) .
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_
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|
.sp 6p
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|
Name Class Representation
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.sp 6p
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_
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.sp 6p
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|
XtNdestroyCallback XtCCallback XtRCallback
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.sp 6p
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_
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.TE
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|
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|
.NH 3
|
|
ObjectPart Default Values
|
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.XS
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|
\fB\*(SN ObjectPart Default Values\fP
|
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.XE
|
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.LP
|
|
All fields in
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.PN ObjectPart
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|
have the same default values as the corresponding fields in
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.PN CorePart .
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.NH 3
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Object Arguments to \*(xI Routines
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.XS
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\*(SN Object Arguments to \*(xI Routines
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.XE
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.LP
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|
The WidgetClass arguments to the following procedures may be
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.PN objectClass
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|
or any subclass:
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|
.sp
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.IP
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|
.PN XtInitializeWidgetClass ,
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|
.PN XtCreateWidget ,
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|
.PN XtVaCreateWidget
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.IP
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.PN XtIsSubclass ,
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.PN XtCheckSubclass
|
|
.IP
|
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.PN XtGetResourceList ,
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.PN XtGetConstraintResourceList
|
|
.sp
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.LP
|
|
The Widget arguments to the following procedures may be of class
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Object
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|
or any subclass:
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.sp
|
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.IP
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.PN XtCreateWidget ,
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.PN XtVaCreateWidget
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.IP
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.PN XtAddCallback ,
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.PN XtAddCallbacks ,
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.PN XtRemoveCallback ,
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.PN XtRemoveCallbacks ,
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.PN XtRemoveAllCallbacks ,
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|
.PN XtCallCallbacks ,
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.PN XtHasCallbacks ,
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.PN XtCallCallbackList
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|
.IP
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.PN XtClass ,
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.PN XtSuperclass ,
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|
.PN XtIsSubclass ,
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.PN XtCheckSubclass ,
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.PN XtIsObject ,
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.PN XtIsRectObj ,
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.PN XtIsWidget ,
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.PN XtIsComposite ,
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.PN XtIsConstraint ,
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.PN XtIsShell ,
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.PN XtIsOverrideShell ,
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.PN XtIsWMShell ,
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.PN XtIsVendorShell ,
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|
.PN XtIsTransientShell ,
|
|
.PN XtIsToplevelShell ,
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.PN XtIsApplicationShell ,
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.PN XtIsSessionShell
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.IP
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.PN XtIsManaged ,
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.PN XtIsSensitive
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|
.br
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|
(both will return
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.PN False
|
|
if argument is not a subclass of
|
|
RectObj)
|
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.IP
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|
.PN XtIsRealized
|
|
.br
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|
(returns the state of the nearest windowed ancestor
|
|
if class of argument is not a subclass of
|
|
Core)
|
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.IP
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|
.PN XtWidgetToApplicationContext
|
|
.IP
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.PN XtDestroyWidget
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.IP
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.PN XtParent ,
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.PN XtDisplayOfObject ,
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.PN XtScreenOfObject ,
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.PN XtWindowOfObject
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.IP
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.PN XtSetKeyboardFocus
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|
(descendant)
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.IP
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|
.PN XtGetGC ,
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|
.PN XtReleaseGC
|
|
.IP
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|
.PN XtName
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|
.IP
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|
.PN XtSetValues ,
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.PN XtGetValues ,
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|
.PN XtVaSetValues ,
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|
.PN XtVaGetValues
|
|
.IP
|
|
.PN XtGetSubresources ,
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|
.PN XtGetApplicationResources ,
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|
.PN XtVaGetSubresources ,
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|
.PN XtVaGetApplicationResources
|
|
.IP
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|
.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
|