► |  | The Racket Graphical Interface Toolkit

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

▼ | 3 | Windowing Classes

3.1 | area<%>
3.2 | area-container<%>
3.3 | area-container-window<%>
3.4 | button%
3.5 | canvas<%>
3.6 | canvas%
3.7 | check-box%
3.8 | checkable-menu-item%
3.9 | choice%
3.10 | clipboard-client%
3.11 | clipboard<%>
3.12 | combo-field%
3.13 | control<%>
3.14 | column-control-event%
3.15 | control-event%
3.16 | cursor%
3.17 | dialog%
3.18 | event%
3.19 | frame%
3.20 | gauge%
3.21 | group-box-panel%
3.22 | grow-box-spacer-pane%
3.23 | horizontal-pane%
3.24 | horizontal-panel%
3.25 | key-event%
3.26 | labelled-menu-item<%>
3.27 | list-box%
3.28 | list-control<%>
3.29 | menu%
3.30 | menu-bar%
3.31 | menu-item<%>
3.32 | menu-item%
3.33 | menu-item-container<%>
3.34 | message%
3.35 | mouse-event%
3.36 | pane%
3.37 | panel%
3.38 | popup-menu%
3.39 | printer-dc%
3.40 | radio-box%
3.41 | selectable-menu-item<%>
3.42 | separator-menu-item%
3.43 | scroll-event%
3.44 | slider%
3.45 | subarea<%>
3.46 | subwindow<%>
3.47 | tab-panel%
3.48 | text-field%
3.49 | timer%
3.50 | top-level-window<%>
3.51 | vertical-pane%
3.52 | vertical-panel%
3.53 | window<%>

On this page:

new
create-status-line
get-menu-bar
has-status-line?
iconize
is-iconized?
is-maximized?
maximize
modified
on-menu-char
on-subwindow-char
on-toolbar-button-click
set-status-text

Inherited methods:
from top-level-window<%>
can-close?
can-exit?
center
display-changed
get-edit-target-object
get-edit-target-window
get-eventspace
get-focus-object
get-focus-window
move
on-activate
on-close
on-exit
on-message
on-system-menu-char
on-traverse-char
resize
set-icon
show
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-event
on-subwindow-focus
on-superwindow-enable
on-superwindow-show
popup-menu
refresh
screen->client
set-cursor
set-label
warp-pointer
from area<%>
get-graphical-min-size
get-parent
get-top-level-window
min-height
min-width
stretchable-height
stretchable-width
from area-container<%>
add-child
after-new-child
begin-container-sequence
border
change-children
container-flow-modified
container-size
delete-child
end-container-sequence
get-alignment
get-children
place-children
reflow-container
set-alignment
spacing

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class frame% : class?
superclass: object%
extends: | top-level-window<%>

A frame is a top-level container window. It has a title bar (which displays the frame’s label), an optional menu bar, and an optional status line.

> > constructor
> > (new frame% |
> > |  | [label label] |
> > | [ | [parent parent] |
> > |  | [width width] |
> > |  | [height height] |
> > |  | [x x] |
> > |  | [y y] |
> > |  | [style style] |
> > |  | [enabled enabled] |
> > |  | [border border] |
> > |  | [spacing spacing] |
> > |  | [alignment alignment] |
> > |  | [min-width min-width] |
> > |  | [min-height min-height] |
> > |  | [stretchable-width stretchable-width] |
> > |  | [stretchable-height stretchable-height]]) |
> → (is-a?/c frame%)
> label : label-string?
> parent : (or/c (is-a?/c frame%) #f) = #f
> width : (or/c dimension-integer? #f) = #f
> height : (or/c dimension-integer? #f) = #f
> x : (or/c position-integer? #f) = #f
> y : (or/c position-integer? #f) = #f
> | style |  | : |  |
> (listof (or/c 'no-resize-border 'no-caption
> 'no-system-menu 'hide-menu-bar
> 'toolbar-button 'float 'metal))
> |  | = |  | null
> enabled : any/c = #t
> border : spacing-integer? = 0
> spacing : spacing-integer? = 0
> | alignment |  | : |  |
> (list/c (or/c 'left 'center 'right)
> (or/c 'top 'center 'bottom))
> |  |  | = |  | '(center top)
> min-width : (or/c dimension-integer? #f) = #f
> min-height : (or/c dimension-integer? #f) = #f
> stretchable-width : any/c = #t
> stretchable-height : any/c = #t

The label string is displayed in the frame’s title bar. If the frame’s label is changed (see set-label), the title bar is updated.

The parent argument can be #f or an existing frame. On Windows, if parent is an existing frame, the new frame is always on top of its parent. On Windows and Unix (for many window managers), a frame is iconized when its parent is iconized.

If parent is #f, then the eventspace for the new frame is the current eventspace, as determined by current-eventspace. Otherwise, parent’s eventspace is the new frame’s eventspace.

If the width or height argument is not #f, it specifies an initial size for the frame (in pixels) assuming that it is larger than the minimum size, otherwise the minimum size is used.

If the x or y argument is not #f, it specifies an initial location for the frame. Otherwise, a location is selected automatically (tiling frames and dialogs as they are created).

The style flags adjust the appearance of the frame on some platforms:

- 'no-resize-border — omits the resizeable border around the window (Windows, Unix), ability to resize the window (Mac OS X), or grow box in the bottom right corner (older Mac OS X)

- 'no-caption — omits the title bar for the frame (Windows, Mac OS X, Unix)

- 'no-system-menu — omits the system menu (Windows)

- 'toolbar-button — includes a toolbar button on the frame’s title bar (Mac OS X); a click on the toolbar button triggers a call to on-toolbar-button-click

- 'hide-menu-bar — hides the menu bar and dock when the frame is active (Mac OS X) or asks the window manager to make the frame fullscreen (Unix)

- 'float — causes the frame to stay in front of all other non-floating windows (Windows, Mac OS X, Unix); on Mac OS X, a floating frame shares the focus with an active non-floating frame; when this style is combined with 'no-caption, then showing the frame does not cause the keyboard focus to shift to the window, and on Unix, clicking the frame does not move the focus; on Windows, a floating frame has no taskbar button

- 'metal — ignored (formerly supported for Mac OS X)

Even if the frame is not shown, a few notification events may be queued for the frame on creation. Consequently, the new frame’s resources (e.g., memory) cannot be reclaimed until some events are handled, or the frame’s eventspace is shut down.

For information about the enabled argument, see window<%>. For information about the border, spacing, and alignment arguments, see area-container<%>. For information about the min-width, min-height, stretchable-width, and stretchable-height arguments, see area<%>.

> method (send a-frame create-status-line) → void?

Creates a status line at the bottom of the frame. The width of the status line is the whole width of the frame (adjusted automatically when resizing), and the height and text size are platform-specific.

See also set-status-text.

> method (send a-frame get-menu-bar) → (or/c (is-a?/c menu-bar%) #f)

Returns the frame’s menu bar, or #f if none has been created for the frame.

> method (send a-frame has-status-line?) → boolean?

Returns #t if the frame’s status line has been created, #f otherwise. See also create-status-line.

> method (send a-frame iconize iconize?) → void?
> iconize? : any/c

Iconizes (minimizes) or deiconizes (restores) the frame. Deiconizing brings the frame to the front.

A frame’s iconization can be changed by the user, and such changes do not go through this method. A program cannot detect when a frame has been iconized except by polling is-iconized?.

> method (send a-frame is-iconized?) → boolean?

Returns #t if the frame is iconized (minimized), #f otherwise.

> method (send a-frame is-maximized?) → boolean?

On Windows and Mac OS X, returns #t if the frame is maximized, #f otherwise. On Unix, the result is always #f.

> method (send a-frame maximize maximize?) → void?
> maximize? : any/c

Specification: Maximizes or restores the frame on Windows and Mac OS X; the frame’s show state is not affected. On Windows, an iconized frame cannot be maximized or restored.

A window’s maximization can be changed by the user, and such changes do not go through this method; use on-size to monitor size changes.

Default implementation: If maximize? is #f, the window is restored, otherwise it is maximized.

> method (send a-frame modified) → boolean?
> (send a-frame modified modified?) → void?
> modified? : any/c

Gets or sets the frame’s modification state as reflected to the user. On Mac OS X, the modification state is reflected as a dot in the frame’s close button. On Windows and Unix, the modification state is reflected by an asterisk at the end of the frame’s displayed title.

> method (send a-frame on-menu-char event) → boolean?
> event : (is-a?/c key-event%)

If the frame has a menu bar with keyboard shortcuts, and if the key event includes a Control, Alt, Option, Meta, Command, Shift, or Function key, then on-menu-char attempts to match the given event to a menu item. If a match is found, #t is returned, otherwise #f is returned.

When the match corresponds to a complete shortcut combination, the menu item’s callback is called (before on-menu-char returns).

If the event does not correspond to a complete shortcut combination, the event may be handled anyway if it corresponds to a mnemonic in the menu bar (i.e., an underlined letter in a menu’s title, which is installed by including an ampersand in the menu’s label). If a mnemonic match is found, the keyboard focus is moved to the menu bar (selecting the menu with the mnemonic), and #t is returned.

> > method
> > (send a-frame on-subwindow-char |  | receiver |  |  |  |
> > |  | event) |  | → |  | boolean?
> receiver : (is-a?/c window<%>)
> event : (is-a?/c key-event%)

Overrides on-subwindow-char in window<%>.
Returns the result of

> (or (send this on-menu-char event)
> (send this on-system-menu-char event)
> (send this on-traverse-char event))

> method (send a-frame on-toolbar-button-click) → void?

On Mac OS X, called when the user clicks the toolbar button on a frame created with the 'toolbar-button style.

> method (send a-frame set-status-text text) → void?
> text : string?

Sets the frame’s status line text and redraws the status line. See also create-status-line.
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