15 Group

▼ |  | Framework: Racket GUI Application Framework

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On this page:

group: %
get-mdi-parent
get-frames
frame-label-changed
frame-shown/ hidden
for-each-frame
get-active-frame
set-active-frame
insert-frame
remove-frame
clear
on-close-all
can-close-all?
locate-file
group: get-the-frame-group
group: on-close-action
group: can-close-check
group: add-to-windows-menu
group: create-windows-menu

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### 15`` Group🔗ℹ

class group:% : class?
superclass: object%

This class manages a group of frames matching the frame:basic<%> interface. There is one instance created by the framework, returned by the function group:get-the-frame-group and every frame that was constructed with frame:basic-mixin adds itself to the result of group:get-the-frame-group.

> > method (send a-group: get-mdi-parent)
> > → (or/c false/c (is-a?/c frame%))

> The result of this method must be used as the parent frame for each frame in the group.

> > method (send a-group: get-frames)
> > → (list-of (is-a?/c frame:basic<%>))

> Returns the frames in the group.

> > method (send a-group: frame-label-changed frame) → void?
> > frame : (is-a?/c frame:basic<%>)

> This method is called by frames constructed with frame:basic-mixin when their titles change.

> Updates the windows menu of each frame in the group.

> > method (send a-group: frame-shown/hidden) → void?

> This method is called by instances of frame:basic% to notify the frame group that a frame’s visibility is changed.

> Updates the Windows menus of all of the frames in the frame group.

> > method (send a-group: for-each-frame f) → void?
> > f : ((is-a?/c frame:basic<%>) -> void?)

> This method applies a function to each frame in the group. It also remembers the function and applies it to any new frames that are added to the group when they are added.

> See also get-frames.

> Applies f to each frame in the group

> > method (send a-group: get-active-frame) → (is-a?/c frame:basic<%>)

> Returns the frame with the keyboard focus or the first frame in the group.

> > method (send a-group: set-active-frame frame) → void?
> > frame : (is-a?/c frame:basic<%>)

> Sets the active frame in the group. This method is called by on-activate.

> > method (send a-group: insert-frame frame) → void?
> > frame : (is-a?/c frame:basic<%>)

> Inserts a frame into the group.

> > method (send a-group: remove-frame frame) → void?
> > frame : (is-a?/c frame:basic<%>)

> Removes a frame from the group.

> > method (send a-group: clear) → boolean?

> This removes all of the frames in the group. It does not close the frames. See also on-close-alland can-close-all?.

> > method (send a-group: on-close-all) → void?

> Call this method to close all of the frames in the group. The function can-close-all? must have been called just before this function and it must have returned #t.

> Calls the on-close method and the show method (with #f as argument) on each frame in the group.

> > method (send a-group: can-close-all?) → boolean?

> Call this method to make sure that closing all of the frames in the frame groups is permitted by the user. The function on-close-all is expected to be called just after this method is called.

> Calls the can-close? method of each frame in the group.

> > method (send a-group: locate-file name)
> > → (or/c false/c (is-a?/c frame:basic<%>))
> > name : path?

> Returns the frame that is editing or viewing the file name.

> procedure (group:get-the-frame-group) → (is-a?/c group:%)

This returns the frame group.

> procedure (group:on-close-action) → void?

See also group:can-close-check.

Call this function from the can-close? callback of a frame in order for the group to properly close the application.

> procedure (group:can-close-check) → boolean?

See also group:on-close-action.

Call this function from the can-close? callback of a frame in order for the group to properly close the application.

> procedure (group:add-to-windows-menu proc) → any
> proc : (-> (is-a?/c menu%) any)

Procedures passed to this function are called when the Windows menu is created. Use it to add additional menu items.

> procedure (group:create-windows-menu mb) → (is-a?/c menu%)
> mb : (is-a?/c menu-item-container<%>)

Creates a windows menu, registers it (internally) with the frame group (see (get-the-frame-group)), and returns it.
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