1Message(3) User Contributed Perl Documentation Message(3)
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6 Tk::Message - Create and manipulate Message widgets
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9 $message = $parent->Message(?options?);
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12 -anchor -font -highlightthickness -takefocus
13 -background -foreground -padx -text
14 -borderwidth -highlightbackground -pady -textvariable
15 -cursor -highlightcolor -relief -width
16 See Tk::options for details of the standard options.
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20 Name: aspect
21 Class: Aspect
22 Switch: -aspect
23 Specifies a non-negative integer value indicating desired aspect
24 ratio for the text. The aspect ratio is specified as
25 100*width/height. 100 means the text should be as wide as it is
26 tall, 200 means the text should be twice as wide as it is tall, 50
27 means the text should be twice as tall as it is wide, and so on.
28 Used to choose line length for text if width option isn't
29 specified. Defaults to 150.
30 Name: justify
32 Class: Justify
33 Switch: -justify
34 Specifies how to justify lines of text. Must be one of left,
35 center, or right. Defaults to left. This option works together
36 with the anchor, aspect, padX, padY, and width options to provide a
37 variety of arrangements of the text within the window. The aspect
38 and width options determine the amount of screen space needed to
39 display the text. The anchor, padX, and padY options determine
40 where this rectangular area is displayed within the widget's
41 window, and the justify option determines how each line is
42 displayed within that rectangular region. For example, suppose
43 anchor is e and justify is left, and that the message window is
44 much larger than needed for the text. The the text will displayed
45 so that the left edges of all the lines line up and the right edge
46 of the longest line is padX from the right side of the window; the
47 entire text block will be centered in the vertical span of the
48 window.
49 Name: width
51 Class: Width
52 Switch: -width
53 Specifies the length of lines in the window. The value may have
54 any of the forms acceptable to Tk_GetPixels. If this option has a
55 value greater than zero then the aspect option is ignored and the
56 width option determines the line length. If this option has a
57 value less than or equal to zero, then the aspect option determines
58 the line length.
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61 The Message method creates a new window (given by the $widget argument)
62 and makes it into a message widget. Additional options, described
63 above, may be specified on the command line or in the option database
64 to configure aspects of the message such as its colors, font, text, and
65 initial relief. The message command returns its $widget argument. At
66 the time this command is invoked, there must not exist a window named
67 $widget, but $widget's parent must exist.
68 A message is a widget that displays a textual string. A message widget
70 has three special features. First, it breaks up its string into lines
71 in order to produce a given aspect ratio for the window. The line
72 breaks are chosen at word boundaries wherever possible (if not even a
73 single word would fit on a line, then the word will be split across
74 lines). Newline characters in the string will force line breaks; they
75 can be used, for example, to leave blank lines in the display.
76 The second feature of a message widget is justification. The text may
78 be displayed left-justified (each line starts at the left side of the
79 window), centered on a line-by-line basis, or right-justified (each
80 line ends at the right side of the window).
81 The third feature of a message widget is that it handles control
83 characters and non-printing characters specially. Tab characters are
84 replaced with enough blank space to line up on the next 8-character
85 boundary. Newlines cause line breaks. Other control characters (ASCII
86 code less than 0x20) and characters not defined in the font are
87 displayed as a four-character sequence \xhh where hh is the two-digit
88 hexadecimal number corresponding to the character. In the unusual case
89 where the font doesn't contain all of the characters in
90 ``0123456789abcdef\x'' then control characters and undefined characters
91 are not displayed at all.
92
94 The Message method creates a widget object. This object supports the
95 configure and cget methods described in Tk::options which can be used
96 to enquire and modify the options described above. The widget also
97 inherits all the methods provided by the generic Tk::Widget class.
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100 When a new message is created, it has no default event bindings:
101 messages are intended for output purposes only.
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104 Tabs don't work very well with text that is centered or right-
105 justified. The most common result is that the line is justified wrong.
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108 message, widget
109perl v5.30.0 2019-07-26 Message(3)