NAME
XmStringComponentType — Data type for compound string components
SYNOPSIS
#include <Xm/Xm.h>
DESCRIPTION
XmStringComponentType is the data type specifying compound string
component types. A compound string component identifies some part of a
compound string, and can have a value and length. A compound string
component can be one of the following types. These component types are
grouped according to their length and value types.
The following components have values of NULL and lengths of 0 (zero).
XmSTRING_COMPONENT_SEPARATOR
This component usually maps to a newline or carriage return
in displayed text.
XmSTRING_COMPONENT_TAB
This component may be thought of as a text component
containing only a single tab.
XmSTRING_COMPONENT_LAYOUT_POP
The layout direction is kept on a stack, with the current
direction kept on top of the stack. When this component is
read, the most recently read layout direction is popped off
the stack and replaced by the direction immediately before
it.
XmSTRING_COMPONENT_END
This component marks the end of a compound string. No other
components should follow. If an application does not place an
XmSTRING_COMPONENT_END component at the end of an XmString,
Motif automatically does it for the application.
The following component has a value of XmDirection and the length of
that direction.
XmSTRING_COMPONENT_LAYOUT_PUSH
The layout direction is kept on a stack, with the current
direction kept on top of the stack. This component replaces
the current layout direction, and causes another to be pushed
onto the top of this stack.
The following component has a value of XmStringDirection and the length
of that direction.
XmSTRING_COMPONENT_DIRECTION
This component sets the string direction by overriding the
previous string direction.
The following components have values of type char * or some equivalent
type, and the lengths of these types.
XmSTRING_COMPONENT_LOCALE_TEXT
This component contains the multibyte text of a compound
string.
XmSTRING_COMPONENT_WIDECHAR_TEXT
This component contains the widechar text of a compound
string.
XmSTRING_COMPONENT_TEXT
This component contains the charset text of a compound
string. Note that a compound string cannot contain both
charset and locale (multibyte or widechar) text.
XmSTRING_COMPONENT_RENDITION_BEGIN
This component marks the beginning of a new rendition. All
text following this component will be rendered using this
rendition as the primary one. If there is already a rendition
in effect, it is kept in memory and used to fill in any
unspecified values in the primary rendition. Renditions are
kept until a corresponding XmSTRING_COMPONENT_RENDITION_END
component is encountered.
XmSTRING_COMPONENT_RENDITION_END
This component signifies that the specified rendition will no
longer be used to render text, and will not be available to
fill in unspecified values of newer renditions.
XmSTRING_COMPONENT_UNKNOWN
This component type signifies that the component contents
belong to an unknown component type.
XmSTRING_COMPONENT_LOCALE
Use this component to specify the locale in which an
internationalized application is to execute. The only valid
character string for this component is _MOTIF_DEFAULT_LOCALE.
XmSTRING_COMPONENT_TAG
For charset text, this is the tag of the font to be used to
display the text. This tag is sometimes referred to as the
charset tag or the fontlist tag.
XmSTRING_COMPONENT_CHARSET
This component is obsolete and remains for compatibility with
previous releases. It has been replaced by
XmSTRING_COMPONENT_TAG.
XmSTRING_COMPONENT_FONTLIST_ELEMENT_TAG
This component is obsolete and remains for compatibility with
previous releases. It has been replaced by
XmSTRING_COMPONENT_TAG.
Some compound string components depend on values defined in other
components. The XmSTRING_COMPONENT_TAB component definition, for
example, depends on information in the
XmSTRING_COMPONENT_RENDITION_BEGIN. To account for these dependencies,
a typical compound string will have its member components in the
following order:
[
[ XmSTRING_COMPONENT_LAYOUT_PUSH ]
[ XmSTRING_COMPONENT_RENDITION_BEGIN ]*
[ XmSTRING_COMPONENT_TAG | XmSTRING_COMPONENT_LOCALE ]
[ XmSTRING_COMPONENT_TAB ]*
[ XmSTRING_COMPONENT_DIRECTION ]
[ XmSTRING_COMPONENT_TEXT |
XmSTRING_COMPONENT_LOCALE_TEXT |
XmSTRING_COMPONENT_WIDECHAR_TEXT ]
[ XmSTRING_COMPONENT_RENDITION_END ]*
[ XmSTRING_COMPONENT_LAYOUT_POP ]
[ XmSTRING_COMPONENT_SEPARATOR ]
]*
XmSTRING_COMPONENT_END
XmStringComponentType(library call)