► |  | GUI: Racket Graphics Toolkit

1 | Overview
2 | Reference
3 | Configuration
4 | Dynamic Loading
| Bibliography
| Index

► | 2 | Reference

2.1 | Windowing Classes
2.2 | Windowing Functions
2.3 | Drawing Classes
2.4 | Drawing Functions
2.5 | Editor Classes
2.6 | Editor Functions
2.7 | WXME Decoding

▼ | 2.1 | Windowing Classes

2.1.1 | area<%>
2.1.2 | area-container<%>
2.1.3 | area-container-window<%>
2.1.4 | button%
2.1.5 | canvas<%>
2.1.6 | canvas%
2.1.7 | check-box%
2.1.8 | checkable-menu-item%
2.1.9 | choice%
2.1.10 | clipboard-client%
2.1.11 | clipboard<%>
2.1.12 | combo-field%
2.1.13 | control<%>
2.1.14 | control-event%
2.1.15 | cursor%
2.1.16 | dialog%
2.1.17 | event%
2.1.18 | frame%
2.1.19 | gauge%
2.1.20 | group-box-panel%
2.1.21 | grow-box-spacer-pane%
2.1.22 | horizontal-pane%
2.1.23 | horizontal-panel%
2.1.24 | key-event%
2.1.25 | labelled-menu-item<%>
2.1.26 | list-box%
2.1.27 | list-control<%>
2.1.28 | menu%
2.1.29 | menu-bar%
2.1.30 | menu-item<%>
2.1.31 | menu-item%
2.1.32 | menu-item-container<%>
2.1.33 | message%
2.1.34 | mouse-event%
2.1.35 | pane%
2.1.36 | panel%
2.1.37 | popup-menu%
2.1.38 | radio-box%
2.1.39 | selectable-menu-item<%>
2.1.40 | separator-menu-item%
2.1.41 | scroll-event%
2.1.42 | slider%
2.1.43 | subarea<%>
2.1.44 | subwindow<%>
2.1.45 | tab-panel%
2.1.46 | text-field%
2.1.47 | timer%
2.1.48 | top-level-window<%>
2.1.49 | vertical-pane%
2.1.50 | vertical-panel%
2.1.51 | window<%>

On this page:

auto-resize
set-label

Inherited methods:
from control<%>
command
get-font
from window<%>
accept-drop-files
client->screen
enable
focus
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-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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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).

( 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-of/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 ( one-of/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, then the bitmap must be valid (see ok? in bitmap%) and not installed in a bitmap-dc% object; otherwise, an exn:fail:contract exception is raised. 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; furthermore, in contrast to the limitations of draw-bitmap in dc<%>, non-monochrome label masks work consistently on all platforms. 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 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.

( 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.

( 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, the bitmap must be valid (see ok? in bitmap%) and not installed in a bitmap-dc% object; otherwise, an exn:fail:contract exception is raised. 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; furthermore, in contrast to the limitations of draw-bitmap in dc<%>, non-monochrome label masks work consistently on all platforms. The bitmap label is installed only if the control was originally created with a bitmap label.
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