Message(3) User Contributed Perl Documentation Message(3)
NAME
Tk::Message - Create and manipulate Message widgets
SYNOPSIS
use Tk::Message;
...
my $message = $parent->Message(
-text => 'somewhat long message text',
-aspect => 100,
-justify => 'left',
)->pack();
STANDARD OPTIONS
-anchor -font -highlightthickness -takefocus
-background -foreground -padx -text
-borderwidth -highlightbackground -pady -textvariable
-cursor -highlightcolor -relief -width
See Tk::options for details of the standard options.
WIDGET-SPECIFIC OPTIONS
Name: aspect
Class: Aspect
Switch: -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.
Name: justify
Class: Justify
Switch: -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.
Name: width
Class: Width
Switch: -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.
DESCRIPTION
The Message method creates a new window (given by the $widget 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 message command returns its $widget argument. At
the time this command is invoked, there must not exist a window named
$widget, but $widget'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-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 \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 displayed at all.
WIDGET METHODS
The Message method creates a widget object. This object supports the
configure and cget methods described in Tk::options which can be used
to enquire and modify the options described above. The widget also
inherits all the methods provided by the generic Tk::Widget class.
DEFAULT BINDINGS
When a new message is created, it has no default event bindings:
messages are intended for output purposes only.
BUGS
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.
KEYWORDS
message, widget
perl v5.30.3 2021-02-07 Message(3)
tk 804.36.0 - Generated Tue Mar 23 15:55:10 CDT 2021