206 lines
4.1 KiB
Plaintext
206 lines
4.1 KiB
Plaintext
.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw XtMake-Geometry-Request XtQuery-Geometry wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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..
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.de De
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.ce 0
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.if \\n(BD .DF
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.nr BD 0
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.in \\n(OIu
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.if \\n(TM .ls 2
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.sp \\n(DDu
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.fi
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..
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.de FD
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.LP
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.KS
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.TA .5i 3i
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.ta .5i 3i
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.nf
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..
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.de FN
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.fi
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.KE
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.LP
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..
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.de IN \" send an index entry to the stderr
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..
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.de C{
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.KS
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.nf
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.D
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.\"
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.ie "\\*(.T"480" .ft L
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..
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.de C}
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.DE
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.R
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..
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.de Pn
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.de ZN
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..
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.de NT
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.ne 7
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.ds NO Note
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.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
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.TB
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.ce
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.in +5n
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.ll -5n
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.R
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..
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. \" Note End -- doug kraft 3/85
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.de NE
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..
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.ny0
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.TH XtClass 3Xt "Release 3" "X Version 11" "XT FUNCTIONS"
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.SH NAME
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XtClass, XtSuperClass, XtIsSubclass, XtCheckSubclass, XtIsComposite, XtIsManaged \- obtain and verify a widget's class
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.SH SYNTAX
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WidgetClass XtClass(\fIw\fP)
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.br
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Widget \fIw\fP;
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.LP
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WidgetClass XtSuperclass(\fIw\fP)
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.br
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Widget \fIw\fP;
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.LP
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Boolean XtIsSubclass(\fIw\fP, \fIwidget_class\fP)
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.br
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Widget \fIw\fP;
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.br
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WidgetClass \fIwidget_class\fP;
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.LP
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void XtCheckSubclass(\fIw\fP, \fIwidget_class\fP, \fImessage\fP)
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.br
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Widget \fIw\fP;
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.br
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WidgetClass \fIwidget_class\fP;
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.br
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String \fImessage\fP;
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.LP
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Boolean XtIsComposite(\fIw\fP)
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.br
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Widget \fIw\fP;
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.LP
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Boolean XtIsManaged(\fIw\fP)
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.br
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Widget \fIw\fP\^;
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.SH ARGUMENTS
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.IP \fIw\fP 1i
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Specifies the widget.
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.IP \fIwidget_class\fP 1i
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Specifies the widget class\*(Wc.
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.ds Me used
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.IP \fImessage\fP 1i
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Specifies the message that is to be \*(Me.
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.SH DESCRIPTION
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The
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.ZN XtClass
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function returns a pointer to the widget's class structure.
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.LP
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The
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.ZN XtSuperclass
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function returns a pointer to the widget's superclass class structure.
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.LP
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The
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.ZN XtIsSubclass
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function returns
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.ZN True
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if the class of the specified widget is equal to
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or is a subclass of the specified widget class.
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The specified widget can be any number of subclasses down the chain
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and need not be an immediate subclass of the specified widget class.
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Composite widgets that need to restrict the class of the items they
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contain can use
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.ZN XtIsSubclass
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to find out if a widget belongs to the desired class of objects.
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.LP
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The
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.ZN XtCheckSubclass
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macro determines if the class of the specified widget is equal to
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or is a subclass of the specified widget class.
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The widget can be any number of subclasses down the chain
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and need not be an immediate subclass of the specified widget class.
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If the specified widget is not a subclass,
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.ZN XtCheckSubclass
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constructs an error message from the supplied message,
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the widget's actual class, and the expected class and calls
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.ZN XtErrorMsg .
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.ZN XtCheckSubclass
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should be used at the entry point of exported routines to ensure
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that the client has passed in a valid widget class for the exported operation.
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.LP
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.ZN XtCheckSubclass
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is only executed when the widget has been compiled with the compiler symbol
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DEBUG defined; otherwise, it is defined as the empty string
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and generates no code.
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.LP
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The
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.ZN XtIsComposite
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function is a convenience function that is equivalent to
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.ZN XtIsSubclass
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with
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.ZN compositeWidgetClass
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specified.
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.LP
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The
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.ZN XtIsManaged
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macro (for widget programmers) or function (for application programmers)
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returns
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.ZN True
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if the specified child widget is managed or
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.ZN False
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if it is not.
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.SH "SEE ALSO"
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XtAppErrorMsg(3Xt),
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XtDisplay(3Xt)
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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