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- '\" $Header: /user6/ouster/wish/man/RCS/message.n,v 1.17 93/04/01 09:52:47 ouster Exp $ SPRITE (Berkeley)
- '/"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
- .\"
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- '\" # Heading for Tcl/Tk man pages
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- .HS message tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- message \- Create and manipulate message widgets
- .SH SYNOPSIS
- \fBmessage\fI \fIpathName \fR?\fIoptions\fR?
- .SH "STANDARD OPTIONS"
- .LP
- .nf
- .ta 4c 8c 12c
- .VS
- \fBanchor\fR \fBcursor\fR \fBpadX\fR \fBtext\fR
- \fBbackground\fR \fBfont\fR \fBpadY\fR \fBtextVariable\fR
- \fBborderWidth\fR \fBforeground\fR \fBrelief\fR \fBwidth\fR
- .VE
- .fi
- .LP
- See the ``options'' manual entry for details on the standard options.
- .SH "WIDGET-SPECIFIC OPTIONS"
- .ta 4c
- .LP
- .nf
- Name: \fBaspect\fR
- Class: \fBAspect\fR
- Command-Line Switch: \fB\-aspect\fR
- .fi
- .IP
- Specifies a non-negative integer value indicating desired
- aspect ratio for the text. The aspect ratio is specified as
- 100*width/height. 100 means the text should
- be as wide as it is tall, 200 means the text should
- be twice as wide as it is tall, 50 means the text should
- be twice as tall as it is wide, and so on.
- .VS
- Used to choose line length for text if \fBwidth\fR option
- isn't specified.
- .VE
- Defaults to 150.
- .LP
- .nf
- Name: \fBjustify\fR
- Class: \fBJustify\fR
- Command-Line Switch: \fB\-justify\fR
- .fi
- .IP
- Specifies how to justify lines of text.
- Must be one of \fBleft\fR, \fBcenter\fR, or \fBright\fR. Defaults
- to \fBleft\fR.
- .VS
- This option works together with the \fBanchor\fR, \fBaspect\fR,
- \fBpadX\fR, \fBpadY\fR, and \fBwidth\fR options to provide a variety
- of arrangements of the text within the window.
- The \fBaspect\fR and \fBwidth\fR options determine the amount of
- screen space needed to display the text.
- The \fBanchor\fR, \fBpadX\fR, and \fBpadY\fR options determine where this
- rectangular area is displayed within the widget's window, and the
- \fBjustify\fR option determines how each line is displayed within that
- rectangular region.
- For example, suppose \fBanchor\fR is \fBe\fR and \fBjustify\fR is
- \fBleft\fR, and that the message window is much larger than needed
- for the text.
- The the text will displayed so that the left edges of all the lines
- line up and the right edge of the longest line is \fBpadX\fR from
- the right side of the window; the entire text block will be centered
- in the vertical span of the window.
- .VE
- .LP
- .nf
- .VS
- Name: \fBwidth\fR
- Class: \fBWidth\fR
- Command-Line Switch: \fB\-width\fR
- .fi
- .IP
- Specifies the length of lines in the window.
- The value may have any of the forms acceptable to \fBTk_GetPixels\fR.
- If this option has a value greater than zero then the \fBaspect\fR
- option is ignored and the \fBwidth\fR option determines the line
- length.
- If this option has a value less than or equal to zero, then
- the \fBaspect\fR option determines the line length.
- .VE
- .BE
-
- .SH DESCRIPTION
- .PP
- The \fBmessage\fR command creates a new window (given by the
- \fIpathName\fR argument) and makes it into a message widget.
- Additional
- options, described above, may be specified on the command line
- or in the option database
- to configure aspects of the message such as its colors, font,
- text, and initial relief. The \fBmessage\fR command returns its
- \fIpathName\fR argument. At the time this command is invoked,
- there must not exist a window named \fIpathName\fR, but
- \fIpathName\fR's parent must exist.
- .PP
- A message is a widget that displays a textual string. A message
- widget has three special features. First, it breaks up
- its string into lines in order to produce a given aspect ratio
- for the window. The line breaks are chosen at word boundaries
- wherever possible (if not even a single word would fit on a
- line, then the word will be split across lines). Newline characters
- in the string will force line breaks; they can be used, for example,
- to leave blank lines in the display.
- .PP
- The second feature of a message widget is justification. The text
- may be displayed left-justified (each line starts at the left side of
- the window), centered on a line-by-line basis, or right-justified
- (each line ends at the right side of the window).
- .PP
- The third feature of a message widget is that it handles control
- characters and non-printing characters specially. Tab characters
- are replaced with enough blank space to line up on the next
- 8-character boundary. Newlines cause line breaks. Other control
- characters (ASCII code less than 0x20) and characters not defined
- in the font are displayed as a four-character sequence \fB\ex\fIhh\fR where
- \fIhh\fR is the two-digit hexadecimal number corresponding to
- the character. In the unusual case where the font doesn't contain
- all of the characters in ``0123456789abcdef\ex'' then control
- characters and undefined characters are not displayed at all.
-
- .SH "WIDGET COMMAND"
- .PP
- The \fBmessage\fR command creates a new Tcl command whose
- name is \fIpathName\fR. This
- command may be used to invoke various
- operations on the widget. It has the following general form:
- .DS C
- \fIpathName option \fR?\fIarg arg ...\fR?
- .DE
- \fIOption\fR and the \fIarg\fRs
- determine the exact behavior of the command. The following
- commands are possible for message widgets:
- .TP
- \fIpathName \fBconfigure\fR ?\fIoption\fR? ?\fIvalue option value ...\fR?
- Query or modify the configuration options of the widget.
- If no \fIoption\fR is specified, returns a list describing all of
- the available options for \fIpathName\fR (see \fBTk_ConfigureInfo\fR for
- information on the format of this list). If \fIoption\fR is specified
- with no \fIvalue\fR, then the command returns a list describing the
- one named option (this list will be identical to the corresponding
- sublist of the value returned if no \fIoption\fR is specified). If
- one or more \fIoption\-value\fR pairs are specified, then the command
- modifies the given widget option(s) to have the given value(s); in
- this case the command returns an empty string.
- \fIOption\fR may have any of the values accepted by the \fBmessage\fR
- command.
-
- .SH "DEFAULT BINDINGS"
- .PP
- When a new message is created, it has no default event bindings:
- messages are intended for output purposes only.
-
- .SH BUGS
- .PP
- Tabs don't work very well with text that is centered or right-justified.
- The most common result is that the line is justified wrong.
-
- .SH KEYWORDS
- message, widget
-