message(n) Tk Built-In Commands message(n)
message - Create and manipulate message widgets
message pathName ?options?
-anchor -highlightbackground -takefocus
-background -highlightcolor -text
-borderwidth -highlightthickness -textvariable
-cursor -padx -width
See the options manual entry for details on the standard options.
[-aspect aspect] 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. Used to choose line
length for text if width option isn't specified. Defaults to 150. [-justify justify]
Specifies how to justify lines of text. Must be one of left, center, or right. Defaults
to left. This option works together with the anchor, aspect, padX, padY, and width
options to provide a variety of arrangements of the text within the window. The aspect
and width options determine the amount of screen space needed to display the text. The
anchor, padX, and padY options determine where this rectangular area is displayed within
the widget's window, and the justify option determines how each line is displayed within
that rectangular region. For example, suppose anchor is e and justify is left, 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
padX from the right side of the window; the entire text block will be centered in the
vertical span of the window. [-width width] Specifies the length of lines in the window.
The value may have any of the forms acceptable to Tk_GetPixels. If this option has a
value greater than zero then the aspect option is ignored and the width option determines
the line length. If this option has a value less than or equal to zero, then the aspect
option determines the line length.
The message command creates a new window (given by the pathName argument) and makes it
into a message widget. Additional options, described above, may be specified on the com-
mand line or in the option database to configure aspects of the message such as its col-
ors, font, text, and initial relief. The message command returns its pathName argument.
At the time this command is invoked, there must not exist a window named pathName, but
pathName's parent must exist.
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.
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).
The third feature of a message widget is that it handles control characters and non-print-
ing 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 \xhh where hh 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\x'' then control characters and undefined characters are not dis-
played at all.
The message command creates a new Tcl command whose name is pathName. This command may be
used to invoke various operations on the widget. It has the following general form:
pathName option ?arg arg ...?
Option and the args determine the exact behavior of the command. The following commands
are possible for message widgets:
pathName cget option
Returns the current value of the configuration option given by option. Option may
have any of the values accepted by the message command.
pathName configure ?option? ?value option value ...?
Query or modify the configuration options of the widget. If no option is speci-
fied, returns a list describing all of the available options for pathName (see
Tk_ConfigureInfo for information on the format of this list). If option is speci-
fied with no value, 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 option is specified). If one or more option-value 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. Option may have any of the values
accepted by the message command.
When a new message is created, it has no default event bindings: messages are intended for
output purposes only.
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.
Tk 4.0 message(n)