On this page:
editor: basic<%>
save-file/ gui-error
load-file/ gui-error
get-filename/ untitled-name
get-pos/ text
get-pos/ text-dc-location
editor: basic-mixin
editor: standard-style-list<%>
editor: standard-style-list-mixin
editor: keymap<%>
editor: keymap-mixin
editor: autowrap<%>
editor: autowrap-mixin
editor: file<%>
editor: file-mixin
editor: backup-autosave<%>
editor: backup-autosave-mixin
editor: info<%>
editor: info-mixin
editor: set-default-font-color
editor: get-default-color-style-name
editor: set-standard-style-list-delta
editor: set-standard-style-list-pref-callbacks
editor: get-standard-style-list
editor: add-after-user-keymap

11 Editor

Classes matching this interface support the basic editor<%> functionality required by the framework.

(send an-editor:basic has-focus?)  boolean?
This function returns #t when the editor has the keyboard focus. It is implemented using: on-focus

(send an-editor:basic local-edit-sequence?)  boolean?
Indicates if this editor is in an edit sequence. Enclosing buffer’s edit-sequence status is not considered by this method.

See begin-edit-sequence and end-edit-sequence for more info about edit sequences.

(send an-editor:basic run-after-edit-sequence thunk    
  [tag])  void?
  thunk : (-> void?)
  tag : (or/c symbol? #f) = #f
This method is used to install callbacks that will be run after any edit-sequence completes.

The procedure thunk will be called immediately if the edit is not in an edit-sequence. If the edit is in an edit-sequence, it will be called when the edit-sequence completes.

If tag is a symbol, the thunk is keyed on that symbol, and only one thunk per symbol will be called after the edit-sequence. Specifically, the last call to run-after-edit-sequence’s argument will be called.

(send an-editor:basic get-top-level-window)
  (or/c #f (is-a?/c top-level-window<%>))
Returns the top-level-window<%> currently associated with this buffer.

This does not work for embedded editors.

(send an-editor:basic save-file-out-of-date?)  boolean?
Returns #t if the file on disk has been modified, by some other program.

(send an-editor:basic save-file/gui-error [filename 
  filename : (or/c path? #f) = #f
  format : (or/c 'guess  'standard  'text  'text-force-cr  'same  'copy)
   = 'same
  show-errors? : boolean? = #t
This method is an alternative to save-file. Rather than showing errors via the original stdout, it opens a dialog with an error message showing the error.

The result indicates if an error happened (the error has already been shown to the user). It returns #t if no error occurred and #f if an error occurred.

(send an-editor:basic load-file/gui-error [filename 
  filename : (or/c string? #f) = #f
  format : (or/c 'guess  'standard  'text  'text-force-cr  'same  'copy)
   = 'guess
  show-errors? : boolean? = #t
This method is an alternative to load-file. Rather than showing errors via the original stdout, it opens a dialog with an error message showing the error.

The result indicates if an error happened (the error has already been shown to the user). It returns #t if no error occurred and #f if an error occurred.

(send an-editor:basic on-close)  void?
This method is called when an editor is closed. Typically, this method is called when the frame containing the editor is closed, but in some cases an editor is considered “closed” before the frame it is in is closed (e.g., when a tab in DrRacket is closed), and thus on-close will be called at that point.

See also can-close? and close.

Does nothing.
(send an-editor:basic can-close?)  boolean?
This method is called to query the editor if is okay to close the editor. Although there is no visible effect associated with closing an editor, there may be some cleanup actions that need to be run when the user is finished with the editor (asking if it should be saved, for example).

See also on-close and close.

Returns #t.
(send an-editor:basic close)  boolean?
This method is merely
(if (can-close?)
    (begin (on-close) #t)

It is intended as a shorthand, helper method for closing an editor. See also can-close? and on-close.
(send an-editor:basic get-filename/untitled-name)  string?
Returns the printed version of the filename for this editor. If the editor doesn’t yet have a filename, it returns a symbolic name (something like "Untitled").

(send an-editor:basic get-pos/text event)
(or/c false/c number?)
(or/c false/c (is-a?/c editor<%>))
  event : (is-a?/c mouse-event%)
Calls get-pos/text-dc-location with the x and y coordinates of event.
(send an-editor:basic get-pos/text-dc-location x 
(or/c false/c number?)
(or/c false/c (is-a?/c editor<%>))
  x : exact-integer?
  y : exact-integer?
This method’s first result is #f when the mouse event does not correspond to a location in the editor.

If the second result is a text% object, then the first result will be a position in the editor and otherwise the first result will be #f.

The editor<%> object will always be the nearest enclosing editor containing the point (x, y).

editor:basic-mixin : (class? . -> . class?)
  argument extends/implements: editor<%>
  result implements: editor:basic<%>
This provides the basic editor services required by the rest of the framework.
The result of this mixin uses the same initialization arguments as the mixin’s argument.
Each instance of a class created with this mixin contains a private keymap% that is chained to the global keymap via: (send keymap chain-to-keymap (keymap:get-global) #f).
This installs the global keymap keymap:get-global to handle keyboard and mouse mappings not handled by keymap. The global keymap is created when the framework is invoked.

(send an-editor:basic can-save-file? filename    
  format)  boolean?
  filename : string?
  format : symbol?
Checks to see if the file on the disk has been modified out side of this editor, using save-file-out-of-date?. If it has, this method prompts the user to be sure they want to save.

(send an-editor:basic after-save-file success?)  void?
  success? : boolean?
If the current filename is not a temporary filename, this method calls handler:add-to-recentwith the current filename.

to add the new filename to the list of recently opened files.

Additionally, updates a private instance variable with the modification time of the file, for using in implementing save-file-out-of-date?.

(send an-editor:basic after-load-file success?)  void?
  success? : boolean?
Updates a private instance variable with the modification time of the file, for using in implementing save-file-out-of-date?

(send an-editor:basic on-focus on?)  void?
  on? : boolean?
Overrides on-focus in editor<%>.
Manages the state to implement has-focus?

(send an-editor:basic on-edit-sequence)  boolean?
Always returns #t. Updates a flag for local-edit-sequence?
(send an-editor:basic after-edit-sequence)  void?
Helps to implement run-after-edit-sequence.
(send an-editor:basic on-new-box type)  (is-a?/c editor-snip%)
  type : (or/c 'pasteboard  'text)
Overrides on-new-box in editor<%>.
Creates instances of pasteboard:basic% or text:basic% instead of the built in pasteboard% and text% classes.
(send an-editor:basic on-new-image-snip filename 
  (is-a?/c image-snip%)
  filename : (or/c path? false/c)
  kind : (one-of/c 'unknown 'gif 'jpeg 'xbm 'xpm 'bmp 'pict)
  relative-path? : any/c
  inline? : any/c
(super on-new-image-snip
       (if (eq? kind 'unknown) 'unknown/mask kind)

(send an-editor:basic get-file directory)  string
  directory : (or/c path-string? false/c)
Overrides get-file in editor<%>.
Uses finder:get-file to find a filename. Also, sets the parameter finder:dialog-parent-parameter to the result of get-top-level-window.
(send an-editor:basic put-file directory    
  default-name)  string
  directory : (or/c path? false/c)
  default-name : (or/c path? false/c)
Overrides put-file in editor<%>.
Uses finder:put-file to find a filename. Also, sets the parameter finder:dialog-parent-parameter to the result of get-top-level-window.

This interface is implemented by the results of editor:standard-style-list-mixin.
editor:standard-style-list-mixin : (class? . -> . class?)
  argument extends/implements: editor<%>
  result implements: editor:standard-style-list<%>
The mixin adds code to the initialization of the class that sets the editor’s style list (via set-style-list) to the result of editor:get-standard-style-list.
In addition, it calls set-load-overwrites-styles with #f. This ensures that saved files with different settings for the style list do not clobber the shared style list.
Classes matching this interface add support for mixing in multiple keymaps. They provides an extensible interface to chained keymaps, through the get-keymaps method.

(send an-editor:keymap get-keymaps)
  (list-of (is-a?/c keymap%))
The keymaps returned from this method are chained to this editor<%>’s keymap.

The result of this method should not change – that is, it should return the same list of keymaps each time it is called.

See also editor:add-after-user-keymap.

Returns (list (keymap:get-user) (keymap:get-global)) by default.

editor:keymap-mixin : (class? . -> . class?)
  argument extends/implements: editor:basic<%>
  result implements: editor:keymap<%>
This provides a mixin that implements the editor:keymap<%> interface.
Classes implementing this interface keep the auto-wrap state set based on the 'framework:auto-set-wrap? preference (see preferences:get for more information about preferences).
They install a preferences callback with preferences:add-callback that sets the state when the preference changes and initialize the value of auto-wrap to the current value of 'framework:auto-set-wrap? via preferences:get.
editor:autowrap-mixin : (class? . -> . class?)
  argument extends/implements: editor:basic<%>
  result implements: editor:autowrap<%>
Objects supporting this interface are expected to support files.

(send an-editor:file get-can-close-parent)
  (or/c false (is-a?/c frame%) (is-a?/c dialog%))
The result of this method is used as the parent for the dialog that asks about closing.

Returns #f by default.
(send an-editor:file update-frame-filename)  void?
Attempts to find a frame that displays this editor. If it does, it updates the frame’s title based on a new filename in the editor.

This method indicates if closing the file when it hasn’t been saved is a reason to alert the user. See also can-close?.

Returns #f by default.

(send an-editor:file user-saves-or-not-modified? allow-cancel?)
  allow-cancel? : #t
If the file has not been saved, this prompts the user about saving and, if the user says to save, then it saves the file.

The result is #t if the save file is up to date, or if the user says it is okay to continue without saving. Generally used when closing the file or quiting the app.

editor:file-mixin : (class? . -> . class?)
  argument extends/implements: editor:keymap<%>
  result implements: editor:file<%>
This editor locks itself when the file that is opened is read-only in the filesystem.
The class that this mixin produces uses the same initialization arguments as its input.

(send an-editor:file set-filename name    
  [temp?])  void?
  name : string?
  temp? : boolean? = #f
Overrides set-filename in editor<%>.
Updates the filename on each frame displaying this editor, for each frame that matches frame:editor<%>.
(send an-editor:file can-close?)  boolean?
If the allow-close-with-no-filename? method returns #f, this method checks to see if the file has been saved at all yet. If not, it asks the user about saving (and saves if they ask).

If the allow-close-with-no-filename? method returns #t, this method does as before, except only asks if the editor’s get-filenamemethod returns a path.

Also calls inner.
(send an-editor:file get-keymaps)
  (list-of (is-a?/c keymap%))
This returns a list containing the super-class’s keymaps, plus the result of keymap:get-file

Classes matching this interface support backup files and autosaving.

(send an-editor:backup-autosave backup?)  boolean?
Indicates whether this editor<%> should be backed up.

Returns the value of the preferences:get applied to 'framework:backup-files?.
(send an-editor:backup-autosave autosave?)  boolean?
Indicates whether this editor<%> should be autosaved.

Returns #t.
(send an-editor:backup-autosave do-autosave)  (or/c #f path?)
This method is called to perform the autosaving. See also autosave:register

When the file has been modified since it was last saved and autosaving it turned on (via the autosave? method) an autosave file is created for this editor<%>.

Returns the filename where the autosave took place, or #f if none did.
(send an-editor:backup-autosave remove-autosave)  void?
This method removes the autosave file associated with this editor<%>.

editor:backup-autosave-mixin : (class? . -> . class?)
  argument extends/implements: editor:basic<%>
  result implements: editor:backup-autosave<%>
This mixin adds backup and autosave functionality to an editor.
During initialization, this object is registered with autosave:register.
The result of this mixin uses the same initialization arguments as the mixin’s argument.

(send an-editor:backup-autosave on-save-file filename    
  format)  bool
  filename : path?
  format : (one-of/c 'guess  'standard  'text  'text-force-cr  'same  'copy)
Augments on-save-file in editor<%>.
If a backup file has not been created this session for this file, deletes any existing backup file and copies the old save file into the backup file. For the backup file’s name, see path-utils:generate-backup-name
(send an-editor:backup-autosave on-close)  void?
Deletes the autosave file and turns off autosaving.
(send an-editor:backup-autosave on-change)  void?
Augments on-change in editor<%>.
Sets a flag indicating that this editor<%> needs to be autosaved.
(send an-editor:backup-autosave set-modified modified?)  void?
  modified? : any/c
Overrides set-modified in editor<%>.
If the file is no longer modified, this method deletes the autosave file. If it is, it updates a flag to indicate that the autosave file is out of date.

An editor<%> matching this interface provides information about its lock state to its top-level-window<%>.
editor:info-mixin : (class? . -> . class?)
  argument extends/implements: editor:basic<%>
  result implements: editor:info<%>
This editor tells the frame when it is locked and unlocked. See also frame:text-info<%>.

(send an-editor:info lock lock?)  void?
  lock? : boolean?
Overrides lock in editor<%>.

(editor:set-default-font-color color)  void?
  color : (is-a?/c color%)
Sets the color of the style named editor:get-default-color-style-name.
The name of the style (in the list returned by editor:get-standard-style-list) that holds the default color.
(editor:set-standard-style-list-delta name    
  delta)  void?
  name : string?
  delta : (is-a?/c style-delta%)
Finds (or creates) the style named by name in the result of editor:get-standard-style-list and sets its delta to delta.

If the style named by name is already in the style list, it must be a delta style.
Installs the font preference callbacks that update the style list returned by editor:get-standard-style-list based on the font preference symbols.
Returns a style list that is used for all instances of editor:standard-style-list%.
(editor:add-after-user-keymap keymap 
  (listof (is-a?/c keymap%))
  keymap : (is-a?/c keymap%)
  keymaps : (listof (is-a?/c keymap%))
Returns a list that contains all of the keymaps in keymaps, in the same relative order, but also with keymap, where keymap is now the first keymap after keymap:get-user (if that keymap is in the list.)