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-.\" $Xorg: TextSource,v 1.3 2000/08/17 19:42:28 cpqbld Exp $
-.NH 2
-TextSrc Object
-.LP
-.XS
-	TextSrc Object
-.XE
-.IN "TextSrc object" "" "@DEF@"
-.LP
-.Ds 0
-.TA 2.0i
-.ta 2.0i
-Application Header file	<X11/Xaw/TextSrc.h>
-.IN "TextSrc.h" ""
-Class Header file	<X11/Xaw/TextSrcP.h>
-.IN "TextSrcP.h" ""
-Class		textSrcObjectClass
-.IN "textSrcObjectClass" ""
-Class Name	TextSrc
-.IN "TextSrc object" "class name"
-Superclass	Object
-.De
-.LP
-The TextSrc object is the root object for all text sources.  Any new text
-source objects should be subclasses of the TextSrc Object.  The
-TextSrc Class contains all methods the Text widget expects a text
-source to export.
-.LP
-Since all text sources will have some resources in common the
-TextSrc defines a few new resources.
-.NH 3
-Resources
-.LP
-When creating an TextSrc object instance, the following resources are
-retrieved from the argument list or from the resource database:
-.LP
-.IN "TextSrc object" "resources"
-.TS H
-lw(1i) lw(1i) lw(1i) lw(.5i) lw(2i).
-_
-.sp 3p
-.TB
-Name	Class	Type	Notes	Default Value
-.sp 3p
-_
-.TH
-.R
-.sp 3p
-destroyCallback	Callback	XtCallbackList		NULL
-editType	EditType	EditMode		NULL
-.sp 3p
-_
-.TE
-.Dc
-.Oe Bold
-.NH 3
-Subclassing the TextSrc
-.IN "TextSrc object" "subclassing" "@DEF@"
-.LP
-The only purpose of the TextSrc Object is to be subclassed.  It contains
-the minimum set of class methods that all text sources must have.  All
-class methods of the TextSrc must be defined, as the Text widget uses
-them all.  While all may be inherited, the direct descendant of TextSrc
-\fBmust\fP specify some of them as TextSrc does not contain enough
-information to be a valid text source by itself.  Do not try to use the
-TextSrc as a valid source for the Text widget; it is not intended to be
-used as a source by itself and bad things will probably happen.
-.TS H
-lw(1i) lw(1.5i) lw(2i) lw(1i).
-_
-.sp 3p
-.TB
-Function	Inherit with	Public Interface	must specify
-.sp 3p
-_
-.TH
-.R
-.sp 3p
-Read	XtInheritRead	XawTextSourceRead	yes
-.IN "XtInheritRead" ""
-.IN "XawTextSourceRead" ""
-Replace	XtInheritReplace	XawTextSourceReplace	no
-.IN "XtInheritReplace" ""
-.IN "XawTextSourceReplace" ""
-Scan	XtInheritScan	XawTextSourceScan	yes
-.IN "XtInheritScan" ""
-.IN "XawTextSourceScan" ""
-Search	XtInheritSearch	XawTextSourceSearch	no
-.IN "XtInheritSearch" ""
-.IN "XawTextSourceSearch" ""
-SetSelection	XtInheritSetSelection	XawTextSourceSetSelection	no
-.IN "XtInheritSetSelection" ""
-.IN "XawTextSourceSetSelection" ""
-ConvertSelection	XtInheritConvertSelection	XawTextSourceConvertSelection	no
-.IN "XtInheritConvertSelection" ""
-.IN "XawTextSourceConvertSelection" ""
-_
-.TE
-.NH 4
-Reading Text.
-.LP
-To read the text in a text source use the \fBRead\fP function:
-.IN "TextSrc object" "Read" "@DEF@"
-.FD 0
-XawTextPosition Read(\fIw\fP, \fIpos\fP, \fItext_return\fP, \fIlength\fP)
-.br
-Widget \fIw\fP;
-.br
-XawTextPosition \fIpos\fP;
-.br
-XawTextBlock \fI*text_return\fP;
-.br
-int \fIlength\fP;
-.FN
-.IP \fIw\fP 1i
-Specifies the TextSrc object.
-.IP \fIpos\fP 1i
-Specifies the position of the first character to be read from the text buffer.
-.IP \fItext\fP 1i
-Returns the text read from the source.
-.IP \fIlength\fP 1i
-Specifies the maximum number of characters the TextSrc should
-return to the application in \fItext_return\fP.
-.LP
-This function returns the text position immediately after the
-characters read from the
-text buffer.  The function is not required to read \fIlength\fP
-characters if that many characters are in the file, it may break at
-any point that is convenient to the internal structure of the
-source.  It may take several calls to \fBRead\fP before the desired
-portion of the text buffer is fully retrieved.
-.NH 4
-Replacing Text.
-.LP
-To replace or edit the text in a text buffer use the \fBReplace\fP function:
-.FD 0
-XawTextPosition Replace(\fIw\fP, \fIstart\fP, \fIend\fP, \fItext\fP)
-.IN "TextSrc object" "Replace" @DEF@
-.br
-Widget \fIw\fP;
-.br
-XawTextPosition \fIstart\fP, \fIend\fP;
-.br
-XawTextBlock \fI*text\fP;
-.FN
-.IP \fIw\fP 1i
-Specifies the TextSrc object.
-.IP \fIstart\fP 1i
-Specifies the position of the first character to be removed from the text
-buffer.  This is also the location to begin inserting the new text.
-.IP \fIend\fP 1i
-Specifies the position immediately after the last character to be
-removed from the text buffer.
-.IP \fItext\fP 1i
-Specifies the text to be added to the text source.
-.LP
-This function can return any of the following values:
-.IP \fBXawEditDone\fP 1.25i
-.IN "XawEditDone" ""
-The text replacement was successful.
-.IP \fBXawPositionError\fP 1.25i
-.IN "XawPositionError" ""
-The edit mode is \fBXawtextAppend\fP and \fIstart\fP is not the last
-character of the source.
-.IP \fBXawEditError\fP 1.25i
-.IN "XawEditError" ""
-Either the Source was read-only or the range to be deleted is larger
-than the length of the Source.
-.LP
-The \fBReplace\fP arguments \fIstart\fP and \fIend\fP represent the
-text source character positions for the existing text that is to be
-replaced by the text in the text block.  The characters from
-\fIstart\fP up to but not including \fIend\fP are deleted, and the
-buffer specified by the text block is inserted in their
-place.  If \fIstart\fP and \fIend\fP are equal, no text is deleted and
-the new text is inserted after \fIstart\fP.
-.NH 4
-Scanning the TextSrc
-.LP
-To search the text source for one of the predefined boundary types use
-the \fBScan\fP function:
-.FD 0
-XawTextPosition Scan(\fIw\fP, \fIposition\fP, \fItype\fP, \fIdir\fP, \fIcount\fP, \fIinclude\fP)
-.IN "TextSrc object" "Scan" @DEF@
-.br
-Widget \fIw\fP;
-.br
-XawTextPosition \fIposition\fP;
-.br
-XawTextScanType \fItype\fP;
-.br
-XawTextScanDirection \fIdir\fP;
-.br
-int \fIcount\fP;
-.br
-Boolean \fIinclude\fP;
-.FN
-.IP \fIw\fP 1i
-Specifies the TextSrc object.
-.IP \fIposition\fP 1i
-Specifies the position to begin scanning the source.
-.IP \fItype\fP 1i
-Specifies the type of boundary to scan for, may be one of:
-\fBXawstPosition\fP, \fBXawstWhiteSpace\fP, \fBXawstEOL\fP,
-.IN "XawstPositions" ""
-.IN "XawstWhiteSpace" ""
-.IN "XawstEOL" ""
-\fBXawstParagraph\fP, \fBXawstAll\fP.  The exact meaning of these
-.IN "XawstParagraph" ""
-.IN "XawstAll" ""
-boundaries is left up to the individual text source.
-.IP \fIdir\fP 1i
-Specifies the direction to scan, may be either \fBXawsdLeft\fP to search
-.IN "XawsdLeft" ""
-backward, or \fBXawsdRight\fP to search forward.
-.IN "XawsdRight" ""
-.IP \fIcount\fP 1i
-Specifies the number of boundaries to scan for.
-.IP \fIinclude\fP 1i
-Specifies whether the boundary itself should be included in the scan.
-.LP
-The \fBScan\fP function returns the position in the text source of the desired
-boundary.  It is expected to return a valid address for
-all calls made to it, thus if a particular request is made that would take
-the text widget beyond the end of the source it must return the
-position of that end.
-.NH 4
-Searching through a TextSrc
-.LP
-To search for a particular string use the \fBSearch\fP function.
-.FD 0
-XawTextPosition Search(\fIw\fP, \fIposition\fP, \fIdir\fP, \fItext\fP)
-.IN "TextSrc object" "Search" @DEF@
-.br
-Widget \fIw\fP;
-.br
-XawTextPosition \fIposition\fP;
-.br
-XawTextScanDirection \fIdir\fP;
-.br
-XawTextBlock \fI*text\fP;
-.FN
-.IP \fIw\fP 1i
-Specifies the TextSrc object.
-.IP \fIposition\fP 1i
-Specifies the position to begin the search.
-.IP \fIdir\fP 1i
-Specifies the direction to search, may be either \fBXawsdLeft\fP to search
-.IN "XawsdLeft" ""
-backward, or \fBXawsdRight\fP to search forward.
-.IN "XawsdRight" ""
-.IP \fItext\fP 1i
-Specifies a text block containing the text to search for.
-.LP
-This function will search through the text buffer attempting to find a
-match for the string in the text block.  If a match is found in the
-direction specified, then the character location of the first character
-in the string is returned.  If no text was found then
-\fBXawTextSearchError\fP is returned.
-.IN "XawTextSearchError" ""
-.NH 4
-Text Selections
-.LP
-While many selection types are handled by the Text widget, text sources
-may have selection types unknown to the Text widget.  When a selection
-conversion is requested by the X server the Text widget will first call
-the \fBConvertSelection\fP function, to attempt the selection
-conversion.
-.FD 0
-Boolean ConvertSelections(\fIw\fP, \fIselection\fP, \fItarget\fP, \fItype\fP, \fIvalue_return\fP, \fIlength_return\fP, \fIformat_return\fP)
-.IN "Text widget" "ConvertSelection" @DEF@
-.br
-Widget \fIw\fP;
-.br
-Atom \fI*selection\fP, \fI*target\fP, \fI*type\fP;
-.br
-caddr_t \fI*value_return\fP;
-.br
-unsigned long \fI*length_return\fP;
-.br
-int \fI*format_return\fP;
-.FN
-.IP \fIw\fP 1i
-Specifies the TextSrc object.
-.IP \fIselection\fP 1i
-Specifies the type of selection that was requested (e.g. \fBPRIMARY\fP).
-.IP \fItarget\fP 1i
-Specifies the type of the selection that has been requested, which
-indicates the desired information about the selection (e.g. Filename,
-Text, Window).
-.IP \fItype\fP 1i
-Specifies a pointer to the atom into which the property type of the converted
-value of the selection is to be stored.  For instance, either file
-name or text might have property type \fBXA_STRING\fP.
-.IP \fIvalue_return\fP 1i
-Returns a pointer into which a pointer to the converted value of the
-selection
-is to be stored.  The selection owner is responsible for allocating
-this storage.  The memory is considered owned by the toolkit, and is
-freed by XtFree when the Intrinsics selection mechanism is done with it.
-.IP \fIlength_return\fP 1i
-Returns a pointer into which the number of elements in value is to be stored.
-The size of each element is determined by \fIformat\fP.
-.IP \fIformat_return\fP 1i
-Returns a pointer into which the size in bits of the data elements of the
-selection value is to be stored.
-.LP
-If this function returns \fBTrue\fP then the Text widget will assume
-that the source has taken care of converting the selection, Otherwise the
-Text widget will attempt to convert the selection itself.
-.LP
-.sp
-If the source needs to know when the text selection is modified it
-should define a \fBSetSelection\fP procedure:
-.FD 0
-void SetSelection(\fIw\fP, \fIstart\fP, \fIend\fP, \fIselection\fP)
-Widget \fIw\fP;
-.IN "SetSelection" "" @DEF@
-.br
-XawTextPosition \fIstart\fP, \fIend\fP;
-.br
-Atom \fIselection\fP;
-.FN
-.IP \fIw\fP 1i
-Specifies the TextSrc object.
-.IP \fIstart\fP 1i
-Specifies the character position of the beginning of the new text selection.
-.IP \fIend\fP
-Specifies the character position of the end of the new text selection.
-.IP \fIselection\fP 1i
-Specifies the type of selection that was requested (e.g. \fBPRIMARY\fP).