► |  | The Racket Graphical Interface Toolkit

1 | Windowing
2 | Windowing Classes
3 | Windowing Functions
4 | Editors
5 | Snip and Style Classes
6 | Editor Classes
7 | Editor Functions
8 | WXME Decoding
9 | Preferences
10 | Dynamic Loading
11 | Startup Actions
12 | Platform Dependencies
| Index

▼ | 2 | Windowing Classes

2.1 | area<%>
2.2 | area-container<%>
2.3 | area-container-window<%>
2.4 | button%
2.5 | canvas<%>
2.6 | canvas%
2.7 | check-box%
2.8 | checkable-menu-item%
2.9 | choice%
2.10 | clipboard-client%
2.11 | clipboard<%>
2.12 | combo-field%
2.13 | control<%>
2.14 | column-control-event%
2.15 | control-event%
2.16 | cursor%
2.17 | dialog%
2.18 | event%
2.19 | frame%
2.20 | gauge%
2.21 | group-box-panel%
2.22 | grow-box-spacer-pane%
2.23 | horizontal-pane%
2.24 | horizontal-panel%
2.25 | key-event%
2.26 | labelled-menu-item<%>
2.27 | list-box%
2.28 | list-control<%>
2.29 | menu%
2.30 | menu-bar%
2.31 | menu-item<%>
2.32 | menu-item%
2.33 | menu-item-container<%>
2.34 | message%
2.35 | mouse-event%
2.36 | pane%
2.37 | panel%
2.38 | popup-menu%
2.39 | printer-dc%
2.40 | radio-box%
2.41 | selectable-menu-item<%>
2.42 | separator-menu-item%
2.43 | scroll-event%
2.44 | slider%
2.45 | subarea<%>
2.46 | subwindow<%>
2.47 | tab-panel%
2.48 | text-field%
2.49 | timer%
2.50 | top-level-window<%>
2.51 | vertical-pane%
2.52 | vertical-panel%
2.53 | window<%>

On this page:

auto-resize
set-label

Inherited methods:
from control<%>
command
from subwindow<%>
reparent
from window<%>
accept-drop-files
client->screen
enable
focus
get-client-handle
get-client-size
get-cursor
get-handle
get-height
get-label
get-plain-label
get-size
get-width
get-x
get-y
has-focus?
is-enabled?
is-shown?
on-drop-file
on-focus
on-move
on-size
on-subwindow-char
on-subwindow-event
on-subwindow-focus
on-superwindow-enable
on-superwindow-show
popup-menu
refresh
screen->client
set-cursor
show
from area<%>
get-graphical-min-size
get-parent
get-top-level-window
min-height
min-width
stretchable-height
stretchable-width
from subarea<%>
horiz-margin
vert-margin

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> class

> message% : class?

superclass: object%

extends: | control<%>

A message control is a static line of text or a static bitmap. The text or bitmap corresponds to the message’s label (see set-label).

> > constructor

> > (new message% |
> > |  | [label label] |
> > |  | [parent parent] |
> > | [ | [style style] |
> > |  | [font font] |
> > |  | [enabled enabled] |
> > |  | [vert-margin vert-margin] |
> > |  | [horiz-margin horiz-margin] |
> > |  | [min-width min-width] |
> > |  | [min-height min-height] |
> > |  | [stretchable-width stretchable-width] |
> > |  | [stretchable-height stretchable-height] |
> > |  | [auto-resize auto-resize]]) |

> → (is-a?/c message%)

> label

> :

> (or/c label-string? (is-a?/c bitmap%)
> (or/c 'app 'caution 'stop))

> parent

> :

> (or/c (is-a?/c frame%) (is-a?/c dialog%)
> (is-a?/c panel%) (is-a?/c pane%))

> style : (listof (or/c 'deleted)) = null
> font : (is-a?/c font%) = normal-control-font
> enabled : any/c = #t
> vert-margin : (integer-in 0 1000) = 2
> horiz-margin : (integer-in 0 1000) = 2
> min-width : (integer-in 0 10000) = graphical-minimum-width
> min-height : (integer-in 0 10000) = graphical-minimum-height
> stretchable-width : any/c = #f
> stretchable-height : any/c = #f
> auto-resize : any/c = #f

Creates a string or bitmap message initially showing label. If label is a bitmap, and if the bitmap has a mask (see get-loaded-mask in bitmap%) that is the same size as the bitmap, then the mask is used for the label. Modifying a bitmap while it is used as a label has an unspecified effect on the displayed label. An 'app, 'caution, or 'stop symbol for label indicates an icon; 'app is the application icon (Windows and Mac OS X) or a generic “info” icon (X), 'caution is a caution-sign icon, and 'stop is a stop-sign icon.

If & occurs in label, it is specially parsed; under Windows and X, the character following & is underlined in the displayed control to indicate a keyboard mnemonic. (Under Mac OS X, mnemonic underlines are not shown.) The mnemonic is meaningless for a message (as far as on-traverse-char in top-level-window<%> is concerned), but it is supported for consistency with other control types. A programmer may assign a meaning to the mnemonic (e.g., by overriding on-traverse-char).

If style includes 'deleted, then the message is created as hidden, and it does not affect its parent’s geometry; the message can be made active later by calling parent’s add-child method.

The font argument determines the font for the control. For information about the enabled argument, see window<%>. For information about the horiz-margin and vert-margin arguments, see subarea<%>. For information about the min-width, min-height, stretchable-width, and stretchable-height arguments, see area<%>.

If auto-resize is not #f, then automatic resizing is initially enanbled (see auto-resize), and the message% object’s graphical minimum size is as small as possible.

> > method

> > (send a-message auto-resize) → boolean?

> (send a-message auto-resize on?) → void?
> on? : any/c

Reports or sets whether the message%’s min-width and min-height are automatically set when the label is changed via set-label.

> > method

> > (send a-message set-label label) → void?

> label : (or/c label-string? (is-a?/c bitmap%))

Overrides set-label in window<%>.
The same as set-label in window<%> when label is a string.

Otherwise, sets the bitmap label for a bitmap message. Since label is a bitmap, if the bitmap has a mask (see get-loaded-mask in bitmap%) that is the same size as the bitmap, then the mask is used for the label. Modifying a bitmap while it is used as a label has an unspecified effect on the displayed label. The bitmap label is installed only if the control was originally created with a bitmap label.
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