27 Text

▼ |  | Framework: Racket GUI Application Framework

1 | Application
2 | Autosave
3 | Canvas
4 | Color Model
5 | Color Prefs
6 | Color
7 | Comment Box
8 | Editor Snip
9 | Editor
10 | Exit
11 | Finder
12 | Frame
13 | Group
14 | GUI Utilities
15 | Handler
16 | Icon
17 | Keymap
18 | Menu
19 | Mode
20 | Number Snip
21 | Panel
22 | Pasteboard
23 | Path Utils
24 | Preferences
25 | Preferences, Textual
26 | Racket
27 | Text
28 | Splash
29 | Test
30 | Version
| Index

On this page:

text: basic<%>
highlight-range
unhighlight-range
get-highlighted-ranges
get-styles-fixed
get-fixed-style
set-styles-fixed
move/ copy-to-edit
initial-autowrap-bitmap
get-port-name
port-name-matches?
get-edition-number
text: basic-mixin
on-paint
on-insert
after-insert
put-file
text: first-line<%>
highlight-first-line
first-line-currently-drawn-specially?
get-first-line-height
is-special-first-line?
text: first-line-mixin
on-paint
on-event
scroll-editor-to
text: foreground-color<%>
text: foreground-color-mixin
default-style-name
get-fixed-style
text: hide-caret/ selection<%>
text: hide-caret/ selection-mixin
after-set-position
text: nbsp->space<%>
text: nbsp->space-mixin
on-insert
after-insert
text: normalize-paste<%>
ask-normalize?
string-normalize
text: normalize-paste-mixin
do-paste
on-insert
after-insert
text: searching<%>
set-searching-state
set-search-anchor
get-search-hit-count
set-replace-start
get-search-bubbles
text: searching-mixin
get-keymaps
after-insert
after-delete
on-focus
text: return<%>
text: return-mixin
on-local-char
text: wide-snip<%>
add-wide-snip
add-tall-snip
text: wide-snip-mixin
text: delegate<%>
get-delegate
set-delegate
text: 1-pixel-string-snip%
split
copy
get-extent
insert
draw
text: 1-pixel-tab-snip%
split
copy
get-extent
draw
text: delegate-mixin
highlight-range
unhighlight-range
on-paint
on-edit-sequence
after-edit-sequence
resized
after-insert
after-delete
after-change-style
on-load-file
after-load-file
text: info<%>
text: info-mixin
set-anchor
set-overwrite-mode
after-set-position
after-insert
after-delete
text: clever-file-format<%>
text: clever-file-format-mixin
on-save-file
text: file<%>
get-read-write?
while-unlocked
text: file-mixin
can-insert?
can-delete?
after-save-file
after-load-file
text: ports<%>
delete/ io
get-insertion-point
set-insertion-point
get-unread-start-point
set-unread-start-point
set-allow-edits
get-allow-edits
insert-between
insert-before
submit-to-port?
on-submit
send-eof-to-in-port
send-eof-to-box-in-port
reset-input-box
clear-output-ports
clear-input-port
clear-box-input-port
get-out-style-delta
get-err-style-delta
get-value-style-delta
get-in-port
get-in-box-port
get-out-port
get-err-port
get-value-port
after-io-insertion
get-box-input-editor-snip%
get-box-input-text%
text: ports-mixin
can-insert?
can-delete?
on-local-char
on-display-size
text: input-box<%>
text: input-box-mixin
on-default-char
text: autocomplete<%>
auto-complete
get-autocomplete-border-color
get-autocomplete-background-color
get-autocomplete-selected-color
completion-mode-key-event?
get-all-words
get-word-at
text: autocomplete-mixin
on-paint
on-char
on-event
text: basic%
text: hide-caret/ selection%
text: nbsp->space%
text: delegate%
text: wide-snip%
text: standard-style-list%
text: input-box%
text: keymap%
text: return%
text: autowrap%
text: file%
text: clever-file-format%
text: backup-autosave%
text: searching%
text: info%
text: range?
text: range-start
text: range-end
text: range-caret-space?
text: range-style
text: range-color
text: autocomplete-append-after
text: autocomplete-limit
text: get-completions/ manuals
text: lookup-port-name

top← prev up next →

### 27`` Text

text:basic<%> : interface?

implements: | editor:basic<%>
| text%

Classes matching this interface are expected to implement the basic functionality needed by the framework.

> ( send a-text:basic highlight-range |  | start |  |  |  |
> |  | end |  |  |  |
> |  | color |  |  |  |
> | [ | caret-space |  |  |  |
> |  | priority |  |  |  |
> |  | style]) |  | → |  | (-> void)

> start : exact-nonnegative-integer?
> end : exact-nonnegative-integer?
> color : ( or/c string? ( is-a?/c color%))
> caret-space : boolean? = #f
> priority : ( symbols 'high 'low) = 'low

> | style |  | : |  | ( symbols 'rectangle 'ellipse 'hollow-ellipse 'dot)
> |  |  | = |  | 'rectangle

> This function highlights a region of text in the buffer.

> The range between start and end will be highlighted with the color in color, if the style is 'rectangle (the default). If the style is 'ellipse, then an ellipse is drawn around the range in the editor, using the color. If the style is 'hollow-ellipse, then the outline of an ellipse is drawn around the range in the editor, using the color.

> If the style is 'dot, then start and end must be the same, and a dot is drawn at the bottom of that position in the editor.

> If caret-space? is not #f, the left edge of the range will be one pixel short, to leave space for the caret. The caret does not interfere with the right hand side of the range. Note that under some platforms, the caret is drawn with XOR, which means almost anything can happen. So if the caret is in the middle of the range it may be hard to see, or if it is on the left of the range and caret-space? is #f it may also be hard to see.

> The priority argument indicates the relative priority for drawing overlapping regions. If two regions overlap and have different priorities, the region with 'high priority will be drawn second and only it will be visible in the overlapping region.

> This method returns a thunk, which, when invoked, will turn off the highlighting from this range.

> See also unhighlight-range.

> ( send a-text:basic unhighlight-range |  | start |  |  |  |
> |  | end |  |  |  |
> |  | color |  |  |  |
> | [ | caret-space |  |  |  |
> |  | style]) |  | → |  | void?

> start : exact-nonnegative-integer?
> end : exact-nonnegative-integer?
> color : ( or/c string? ( is-a?/c color%))
> caret-space : boolean? = #f

> | style |  | : |  | ( symbols 'rectangle 'ellipse 'hollow-ellipse)
> |  |  | = |  | 'rectangle

> This method removes the highlight from a region of text in the buffer.

> The region must match up to a region specified from an earlier call to highlight-range.

> ( send a-text:basic get-highlighted-ranges) → ( listof range)

> Returns a list of (opaque) values representing the active ranges in the editor.

> ( send a-text:basic get-styles-fixed) → boolean?

> If the result of this function is #t, the styles in this text:basic<%> will be fixed. This means that any text inserted to this editor has its style set to this editor’s style-list%’s "Standard" style.

> See also set-styles-fixed.

> ( send a-text:basic get-fixed-style) → ( is-a?/c style<%>)

> Returns the style used by set-styles-fixedwhen setting the styles.

> ( send a-text:basic set-styles-fixed fixed?) → void
> fixed? : boolean?

> Sets the styles fixed parameter of this text%. See also get-styles-fixed and get-fixed-style.

> ( send a-text:basic move/copy-to-edit |  | dest-text |  |  |  |
> |  | start |  |  |  |
> |  | end |  |  |  |
> |  | dest-pos) |  | → |  | void

> dest-text : (instance text%)
> start : exact-integer
> end : exact-integer
> dest-pos : exact-integer

> This moves or copies text and snips to another edit.

> Moves or copies from the edit starting at start and ending at end. It puts the copied text and snips in dest-text starting at location dest-pos.

> If a snip refused to be moved, it will be copied, otherwise it will be moved. A snip may refuse to be moved by returning #f from release-from-owner.

> ( send a-text:basic initial-autowrap-bitmap)
> → (union |#f| (instance bitmap%))

> The result of this method is used as the initial autowrap bitmap. Override this method to change the initial bitmap%. See also set-autowrap-bitmap

> Defaultly returns the result of icon:get-autowrap-bitmap

> ( send a-text:basic get-port-name) → symbol?

> The result of this method is a symbol that identifies this editor and that is used as the port-name of a port that is read from this editor if this editor is used in DrRacket. See also port-name-matches?.

> ( send a-text:basic port-name-matches? id) → boolean?
> id : ( or/c path? symbol?)

> Indicates if id matches the port name of this file. If the file is saved, the port name matches when the save file is the path as id. If the file has not been saved, the port name matches if the symbol is the same as the result of port-name-matches?.

> ( send a-text:basic get-edition-number)
> → exact-nonnegative-integer?

> Returns a number that increments everytime something in the editor changes.

> The number is updated in after-insert in text% and after-delete in text%.

text:basic-mixin : ( class? . -> . class?)

argument extends/implements: | editor:basic<%>
| text%

result implements: | text:basic<%>

This mixin implements the basic functionality needed for text% objects in the framework.
The class that this mixin produces uses the same initialization arguments as it’s input.

> ( send a-text:basic on-paint |  | before? |  |  |  |
> |  | dc |  |  |  |
> |  | left |  |  |  |
> |  | top |  |  |  |
> |  | right |  |  |  |
> |  | bottom |  |  |  |
> |  | dx |  |  |  |
> |  | dy |  |  |  |
> |  | draw-caret) |  | → |  | void

> before? : any/c
> dc : ( is-a?/c dc<%>)
> left : real?
> top : real?
> right : real?
> bottom : real?
> dx : real?
> dy : real?
> draw-caret : ( one-of/c 'no-caret 'show-inactive-caret 'show-caret)

> Overrides on-paint in editor<%>.
> Draws the rectangles installed by highlight-range.

> ( send a-text:basic on-insert start end) → void
> start : exact-int
> end : exact-int

> Augments on-insert in text%.
> See set-styles-fixed.

> ( send a-text:basic after-insert start len) → void
> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments after-insert in text%.
> See set-styles-fixed.

> ( send a-text:basic put-file |  | directory |  |  |  |
> |  | default-name) |  | → |  | void

> directory : path
> default-name : path

> Overrides put-file in editor<%>.
> Like put-file but uses finder:put-file instead of put-file.

text:first-line<%> : interface?

implements: | text%

Objects implementing this interface, when highlight-first-line is invoked with #t, always show their first line, even with scrolled (as long as first-line-currently-drawn-specially? returns #t).

> ( send a-text:first-line highlight-first-line on?) → void?
> on? : boolean?

> Call this method to enable special treatment of the first line in the editor.

> ( send a-text:first-line first-line-currently-drawn-specially?)
> → boolean?

> Returns #t if is-special-first-line? returned #t for the current first line and if the buffer is scrolled down so that the first line would not (ordinarily) be visible.

> ( send a-text:first-line get-first-line-height) → number?

> Returns the height, in pixels, of the first line.

> ( send a-text:first-line is-special-first-line? line) → boolean?
> line : string?

> Override this method to control when the first line is always visible. The argument is the first line, as a string.

text:first-line-mixin : ( class? . -> . class?)

argument extends/implements: | text%

result implements: | text:first-line<%>

Provides the implementation of text:first-line<%>. Does so by just painting the text of the first line over top of what is already there and overriding scroll-editor-to to patch up scrolling and on-event to patch up mouse handling.

> ( send a-text:first-line on-paint |  | before? |  |  |  |
> |  | dc |  |  |  |
> |  | left |  |  |  |
> |  | top |  |  |  |
> |  | right |  |  |  |
> |  | bottom |  |  |  |
> |  | dx |  |  |  |
> |  | dy |  |  |  |
> |  | draw-caret) |  | → |  | void?

> before? : any/c
> dc : ( is-a?/c dc<%>)
> left : real?
> top : real?
> right : real?
> bottom : real?
> dx : real?
> dy : real?
> draw-caret : ( one-of/c 'no-caret 'show-inactive-caret 'show-caret)

> Overrides on-paint in editor<%>.
> Based on the various return values of the methods in text:first-line, draws the first actual line of the editor over top of the first visible line in the editor.

> ( send a-text:first-line on-event event) → void?
> event : ( is-a?/c mouse-event%)

> Overrides on-event in editor<%>.
> Clicks in the first line cause the editor to scroll to the actual first line.

> ( send a-text:first-line scroll-editor-to |  | localx |  |  |  |
> |  | localy |  |  |  |
> |  | width |  |  |  |
> |  | height |  |  |  |
> |  | refresh? |  |  |  |
> |  | bias) |  | → |  | void?

> localx : real?
> localy : real?
> width : ( and/c real? ( not/c negative?))
> height : ( and/c real? ( not/c negative?))
> refresh? : any/c
> bias : ( one-of/c 'start 'end 'none)

> Overrides scroll-editor-to in editor<%>.
> Scrolls a little bit more, when a scroll would be requested that scrolls something so that it is line underneath the first line.

text:foreground-color<%> : interface?

implements: | text:basic<%>
| editor:standard-style-list<%>

text:foreground-color-mixin : ( class? . -> . class?)

argument extends/implements: | text:basic<%>
| editor:standard-style-list<%>

result implements: | text:foreground-color<%>

This mixin changes the default text style to have the foreground color controlled by editor:set-default-font-color.

> ( send a-text:foreground-color default-style-name) → string

> Overrides default-style-name in editor<%>.
> Returns the result of editor:get-default-color-style-name.

> ( send a-text:foreground-color get-fixed-style)
> → ( is-a?/c style<%>)

> Overrides get-fixed-style in text:basic<%>.
> Returns the style named by editor:get-default-color-style-name.

text:hide-caret/selection<%> : interface?

implements: | text:basic<%>

This class hides the caret, except when the selection is active.
Instances of this class are useful for editors that used for displaying purposes, but still allow users to copy their text.

text:hide-caret/selection-mixin : ( class? . -> . class?)

argument extends/implements: | text:basic<%>

result implements: | text:hide-caret/selection<%>

> ( send a-text:hide-caret/selection after-set-position) → void

> Augments after-set-position in text%.
> Calls hide-caret to hide the caret when there is only a caret and no selection.

text:nbsp->space<%> : interface?

implements: | text%

Classes that implement this interface silently change non-breaking spaces, ie the character ( integer->char 160), to regular spaces when inserted into the editor.

text:nbsp->space-mixin : ( class? . -> . class?)

argument extends/implements: | text%

result implements: | text:nbsp->space<%>

> ( send a-text:nbsp->space on-insert |  | start |  |  |  |
> |  | end) |  | → |  | void

> start : exact-int
> end : exact-int

> Augments on-insert in text%.
> Starts an edit-sequence by calling begin-edit-sequence.

> ( send a-text:nbsp->space after-insert |  | start |  |  |  |
> |  | len) |  | → |  | void

> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments after-insert in text%.
> Replaces all non-breaking space characters ( integer->char 160) by #\space characters.

> Ends the edit sequence (by calling end-edit-sequence) started in on-insert.

text:normalize-paste<%> : interface?

implements: | text:basic<%>

> ( send a-text:normalize-paste ask-normalize?) → boolean?

> Prompts the user if the pasted text should be normalized (and updates various preferences based on the response).

> Override this method in the mixin to avoid all GUI and preferences interactions.

> ( send a-text:normalize-paste string-normalize s) → string?
> s : string?

> Normalizes s. Defaults to string-normalize-nfkc.

text:normalize-paste-mixin : ( class? . -> . class?)

argument extends/implements: | text:basic<%>

result implements: | text:normalize-paste<%>

> ( send a-text:normalize-paste do-paste |  | start |  |  |  |
> |  | time) |  | → |  | void?

> start : exact-nonnegative-integer?
> time : ( and/c exact? integer?)

> Overrides do-paste in text%.
> Overridden to detect when insertions are due to pasting. Sets some internal state and calls the super.

> ( send a-text:normalize-paste on-insert |  | start |  |  |  |
> |  | len) |  | → |  | void?

> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments on-insert in text%.
> Calls begin-edit-sequence.

> ( send a-text:normalize-paste after-insert |  | start |  |  |  |
> |  | len) |  | → |  | void?

> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments after-insert in text%.
> Normalizes any next text and calls end-edit-sequence.

text:searching<%> : interface?

implements: | editor:keymap<%>
| text:basic<%>

Any object matching this interface can be searched.
Searches using this class has a non-traditional feature for performance reasons. Specifically, multiple adjacent hits are coalesced into a single search results when bubbles are drawn. This means, for example, that searching for a space in a file with 80,000 spaces (as one file in the Racket code base has) is still tractable, since many of those spaces will be next to each other and thus there will be far fewer bubbles (the file in question has only 20,000 such bubbles).

> ( send a-text:searching set-searching-state |  | str |
> |  | cs? |
> |  | replace-start) |

> → void?
> str : ( or/c false/c string?)
> cs? : boolean?
> replace-start : ( or/c false/c number?)

> If str is not #f, then this method highlights every occurrence of str in the editor. If str is #f, then it clears all of the highlighting in the buffer.

> If cs? is #f, the search is case-insensitive, and otherwise it is case-sensitive.

> If the replace-start argument is #f, then the search is not in replacement mode. If it is a number, then the first search hit after that position in the editor is where the next replacement will take place.

> ( send a-text:searching set-search-anchor position) → void?
> position : ( or/c false/c number?)

> Sets the anchor’s position in the editor. Only takes effect if the 'framework:anchored-search preference is on.

> ( send a-text:searching get-search-hit-count) → number?

> Returns the number of hits for the search in the buffer, based on the count found last time that a search happened.

> ( send a-text:searching set-replace-start pos) → void?
> pos : ( or/c false/c number?)

> Sets the position where replacement next occurs. This is equivalent to calling set-searching-state with a new replace-start argument, but the other arguments the same as the last call to set-searching-state, but is more efficient (since set-searching-state will search the entire buffer and re-build all of the bubbles).

> ( send a-text:searching get-search-bubbles)

> →

> ( listof ( list/c ( cons/c number number)
> ( list/c number number number)))

> Returns information about the search bubbles in the editor. Each item in the outermost list corresponds to a single bubble. The pair of numbers is the range of the bubble and the triple of numbers is the color of the bubble, in RGB coordinates.

> If replace-start has been set (via set-replace-start) and the closest search hit following replace-start does not collapse with an adjacent bubble,the result will include that bubble. If the closest search hit after replace-start is collpased with another bubble, then the search hit is not reflected in the result.

> This method is intended for use in test suites.

text:searching-mixin : ( class? . -> . class?)

argument extends/implements: | editor:keymap<%>
| text:basic<%>

result implements: | text:searching<%>

This text% can be searched.
The result of this mixin uses the same initialization arguments as the mixin’s argument.

> ( send a-text:searching get-keymaps)
> → (list-of (instance keymap%))

> Overrides get-keymaps in editor:keymap<%>.
> This returns a list containing the super-class’s keymaps, plus the result of keymap:get-search

> ( send a-text:searching after-insert |  | start |  |  |  |
> |  | len) |  | → |  | void?

> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments after-insert in text%.
> Re-does any search now that the contents of the window have changed.

> ( send a-text:searching after-delete |  | start |  |  |  |
> |  | len) |  | → |  | void?

> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments after-delete in text%.
> Re-does any search now that the contents of the window have changed.

> ( send a-text:searching on-focus on?) → void?
> on? : boolean?

> Overrides on-focus in editor<%>.
> Tells the frame containing the editor to search based on this editor via the set-text-to-search method.

text:return<%> : interface?

implements: | text%

Objects supporting this interface were created by text:return-mixin.

text:return-mixin : ( class? . -> . class?)

argument extends/implements: | text%

result implements: | text:return<%>

Use this buffer to perform some special action when return is typed.

> ( new text:return-mixin [return return])
> → ( is-a?/c text:return-mixin)
> return : (-> boolean?)

> ( send a-text:return on-local-char event) → void
> event : ( is-a?/c key-event%)

> Overrides on-local-char in editor<%>.
> If key is either return or newline, only invoke the return thunk (initialization argument) and do nothing else.

text:wide-snip<%> : interface?

implements: | text:basic<%>

> ( send a-text:wide-snip add-wide-snip snip) → void
> snip : (instance snip%)

> Registers a snip in this editor to be resized when its viewing area changes. Ensures the snip is as wide as the viewing area.

> This method should only be called by add-wide-snip in canvas:wide-snip<%>.

> ( send a-text:wide-snip add-tall-snip snip) → void
> snip : ( is-a?/c snip%)

> Registers a snip in this editor. It is resized when the viewing area of the editor changes.

> This method should only be called by add-tall-snip in canvas:wide-snip<%>.

text:wide-snip-mixin : ( class? . -> . class?)

argument extends/implements: | text:basic<%>

result implements: | text:wide-snip<%>

text:delegate<%> : interface?

implements: | text:basic<%>

Implementations of this interface copy all of the changes to this editor to the result of get-delegate except instead of regular string and tab snips, instead instances of text:1-pixel-string-snip% and text:1-pixel-tab-snip% are created.
The contents of the two editor are kept in sync, as modifications to this object happen.

> ( send a-text:delegate get-delegate)
> → (union |#f| (instanceof text%))

> The result of this method is the text% object that the contents of this editor are being delegated to, or #f, if there is none.

> ( send a-text:delegate set-delegate delegate) → void
> delegate : (union |#f| (instanceof text%))

> This method sets the current delegate.

> When it is set, all of the snips are copied from this object to delegate. Additionally, if this object implements scheme:text<%> the tab settings of delegate are updated to match this objects.

text:1-pixel-string-snip% : class?
superclass: string-snip%

This class re-uses the implementation of string-snip% to implement a string snip that just draws a single pixel for each character in the string.
See also text:1-pixel-tab-snip% for a similar extension to the tab-snip%class.
This snip is used in conjunction with the frame:delegate<%> and text:delegate<%> interfaces.

> ( send a-text:1-pixel-string-snip split |  | position |  |  |  |
> |  | first |  |  |  |
> |  | second) |  | → |  | void

> position : exact
> first : ( box (instanceof snip%))
> second : ( box (instanceof snip%))

> Overrides split in snip%.
> Fills the boxes with instance of text:1-pixel-string-snip%s.

> ( send a-text:1-pixel-string-snip copy) → (instanceof snip%)

> Overrides copy in snip%.
> Creates and returns an instance of text:1-pixel-string-snip%.

> ( send a-text:1-pixel-string-snip get-extent |  | dc |  |  |  |
> |  | x |  |  |  |
> |  | y |  |  |  |
> | [ | w |  |  |  |
> |  | h |  |  |  |
> |  | descent |  |  |  |
> |  | space |  |  |  |
> |  | lspace |  |  |  |
> |  | rspace]) |  | → |  | void

> dc : (instanceof dc<%>)
> x : real
> y : real
> w : ( box (union non-negative-real-number |#f|)) = |#f|
> h : ( box (union non-negative-real-number |#f|)) = |#f|
> descent : ( box (union non-negative-real-number |#f|)) = |#f|
> space : ( box (union non-negative-real-number |#f|)) = |#f|
> lspace : ( box (union non-negative-real-number |#f|)) = |#f|
> rspace : ( box (union non-negative-real-number |#f|)) = |#f|

> Overrides get-extent in snip%.
> Sets the descent, space, lspace, and rspace to zero. Sets the height to 1. Sets the width to the number of characters in the string.

> ( send a-text:1-pixel-string-snip insert |  | s |  |  |  |
> |  | len |  |  |  |
> | [ | pos]) |  | → |  | void

> s : string
> len : exact
> pos : exact = 0

> Overrides insert in string-snip%.

> ( send a-text:1-pixel-string-snip draw |  | dc |  |  |  |
> |  | x |  |  |  |
> |  | y |  |  |  |
> |  | left |  |  |  |
> |  | top |  |  |  |
> |  | right |  |  |  |
> |  | bottom |  |  |  |
> |  | dx |  |  |  |
> |  | dy |  |  |  |
> |  | draw-caret) |  | → |  | void

> dc : (instanceof dc<%>)
> x : real
> y : real
> left : real
> top : real
> right : real
> bottom : real
> dx : real
> dy : real
> draw-caret : (union 'no-caret 'show-inactive-caret 'show-caret)

> Overrides draw in snip%.
> Draws black pixels for non-whitespace characters and draws nothing for whitespace characters.

text:1-pixel-tab-snip% : class?
superclass: tab-snip%

This class re-uses the implementation of tab-snip% to implement a string snip that is always one pixel high.
See also text:1-pixel-string-snip% for a similar extension to the string-snip%class.
This snip is used in conjunction with the frame:delegate<%> and text:delegate<%> interfaces.

> ( send a-text:1-pixel-tab-snip split |  | position |  |  |  |
> |  | first |  |  |  |
> |  | second) |  | → |  | void

> position : exact
> first : ( box (instanceof snip%))
> second : ( box (instanceof snip%))

> Overrides split in snip%.
> Fills the boxes with instance of text:1-pixel-tab-snip%s.

> ( send a-text:1-pixel-tab-snip copy) → (instanceof snip%)

> Overrides copy in snip%.
> Creates and returns an instance of text:1-pixel-tab-snip%.

> ( send a-text:1-pixel-tab-snip get-extent |  | dc |  |  |  |
> |  | x |  |  |  |
> |  | y |  |  |  |
> | [ | w |  |  |  |
> |  | h |  |  |  |
> |  | descent |  |  |  |
> |  | space |  |  |  |
> |  | lspace |  |  |  |
> |  | rspace]) |  | → |  | void

> dc : (instanceof dc<%>)
> x : real
> y : real
> w : ( box (union non-negative-real-number |#f|)) = |#f|
> h : ( box (union non-negative-real-number |#f|)) = |#f|
> descent : ( box (union non-negative-real-number |#f|)) = |#f|
> space : ( box (union non-negative-real-number |#f|)) = |#f|
> lspace : ( box (union non-negative-real-number |#f|)) = |#f|
> rspace : ( box (union non-negative-real-number |#f|)) = |#f|

> Overrides get-extent in snip%.
> Sets the descent, space, lspace, and rspace to zero. Sets the height to 1. Sets the width to the width of tabs as returned in the tab-width parameter of the get-tabs method.

> ( send a-text:1-pixel-tab-snip draw |  | dc |  |  |  |
> |  | x |  |  |  |
> |  | y |  |  |  |
> |  | left |  |  |  |
> |  | top |  |  |  |
> |  | right |  |  |  |
> |  | bottom |  |  |  |
> |  | dx |  |  |  |
> |  | dy |  |  |  |
> |  | draw-caret) |  | → |  | void

> dc : (instanceof dc<%>)
> x : real
> y : real
> left : real
> top : real
> right : real
> bottom : real
> dx : real
> dy : real
> draw-caret : (union 'no-caret 'show-inactive-caret 'show-caret)

> Overrides draw in snip%.
> Draws nothing.

text:delegate-mixin : ( class? . -> . class?)

argument extends/implements: | text:basic<%>

result implements: | text:delegate<%>

This mixin provides an implementation of the text:delegate<%> interface.

> ( send a-text:delegate highlight-range |  | start |  |  |  |
> |  | end |  |  |  |
> |  | color |  |  |  |
> | [ | caret-space |  |  |  |
> |  | priority |  |  |  |
> |  | style]) |  | → |  | (-> void)

> start : exact-integer
> end : exact-nonnegative-integer?
> color : ( or/c string? ( is-a?/c color%))
> caret-space : boolean? = #f
> priority : ( symbols 'high 'low) = 'low

> | style |  | : |  | ( symbols 'rectangle 'ellipse 'hollow-ellipse 'dot)
> |  |  | = |  | 'rectangle

> Overrides highlight-range in text:basic<%>.
> In addition to calling the super method, highlight-range, this method forwards the highlighting to the delegatee.

> ( send a-text:delegate unhighlight-range |  | start |  |  |  |
> |  | end |  |  |  |
> |  | color |  |  |  |
> | [ | caret-space |  |  |  |
> |  | style]) |  | → |  | void?

> start : exact-nonnegative-integer?
> end : exact-nonnegative-integer?
> color : ( or/c string? ( is-a?/c color%))
> caret-space : boolean? = #f

> | style |  | : |  | ( symbols 'rectangle 'ellipse 'hollow-ellipse)
> |  |  | = |  | 'rectangle

> Overrides unhighlight-range in text:basic<%>.
> This method propagates the call to the delegate and calls the super method.

> ( send a-text:delegate on-paint |  | before? |  |  |  |
> |  | dc |  |  |  |
> |  | left |  |  |  |
> |  | top |  |  |  |
> |  | right |  |  |  |
> |  | bottom |  |  |  |
> |  | dx |  |  |  |
> |  | dy |  |  |  |
> |  | draw-caret) |  | → |  | void

> before? : any/c
> dc : ( is-a?/c dc<%>)
> left : real?
> top : real?
> right : real?
> bottom : real?
> dx : real?
> dy : real?
> draw-caret : ( one-of/c 'no-caret 'show-inactive-caret 'show-caret)

> Overrides on-paint in editor<%>.
> Draws a blue region in the delegatee editor that shows where the visible region of the delegate editor is.

> ( send a-text:delegate on-edit-sequence) → void

> Augments on-edit-sequence in editor<%>.
> starts an edit sequence in the delegate.

> ( send a-text:delegate after-edit-sequence) → void

> Augments after-edit-sequence in editor<%>.
> ends an edit sequence in the delegate.

> ( send a-text:delegate resized |  | snip |  |  |  |
> |  | redraw-now?) |  | → |  | void

> snip : ( is-a?/c snip%)
> redraw-now? : boolean?

> Overrides resized in editor<%>.
> Sends a message to the delegate to update the size of the copied snip, if there is one.

> ( send a-text:delegate after-insert |  | start |  |  |  |
> |  | len) |  | → |  | void

> start : number
> len : number

> Augments after-insert in text%.
> forwards the change to the delegate

> ( send a-text:delegate after-delete |  | start |  |  |  |
> |  | len) |  | → |  | void

> start : number
> len : number

> Augments after-delete in text%.
> forwards the change to the delegate.

> ( send a-text:delegate after-change-style |  | start |  |  |  |
> |  | len) |  | → |  | void

> start : number
> len : number

> Augments after-change-style in text%.
> forwards the changed style to the delegate.

> ( send a-text:delegate on-load-file |  | filename |  |  |  |
> |  | format) |  | → |  | void

> filename : string
> format : symbol?

> Augments on-load-file in editor<%>.
> remembers the filename, for use in after-load-file.

> ( send a-text:delegate after-load-file success?) → void
> success? : boolean?

> Augments after-load-file in editor<%>.
> updates the delegate with the new contents of the text.

text:info<%> : interface?

implements: | text:basic<%>

Objects supporting this interface are expected to send information about themselves to the frame that is displaying them.

text:info-mixin : ( class? . -> . class?)

argument extends/implements: | editor:keymap<%>
| text:basic<%>

result implements: | text:info<%>

This mixin adds support for supplying information to objects created with frame:info-mixin. When this editor:basic<%> is displayed in a frame, that frame must have been created with frame:info-mixin.

> ( send a-text:info set-anchor on?) → void
> on? : any/c

> Overrides set-anchor in text%.
> Calls the anchor-status-changed method of the frame that is viewing this object. It uses get-canvas to get the canvas for this frame, and uses that canvas’s top-level-window<%> as the frame.

> ( send a-text:info set-overwrite-mode on?) → void
> on? : any/c

> Overrides set-overwrite-mode in text%.
> Calls the overwrite-status-changedmethod of the frame that is viewing this object. It uses get-canvas to get the canvas for this frame, and uses that canvas’s top-level-window<%> as the frame.

> ( send a-text:info after-set-position) → void

> Augments after-set-position in text%.
> Calls the editor-position-changed method of the frame that is viewing this object. It uses get-canvas to get the canvas for this frame, and uses that canvas’s top-level-window<%> as the frame.

> ( send a-text:info after-insert start len) → void
> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments after-insert in text%.
> Calls the editor-position-changed method of the frame that is viewing this object. It uses get-canvas to get the canvas for this frame, and uses that canvas’s top-level-window<%> as the frame.

> ( send a-text:info after-delete start len) → void
> start : exact-nonnegative-integer?
> len : exact-nonnegative-integer?

> Augments after-delete in text%.
> Calls the editor-position-changed method of the frame that is viewing this object. It uses get-canvas to get the canvas for this frame, and uses that canvas’s top-level-window<%> as the frame.

text:clever-file-format<%> : interface?

implements: | text%

Objects supporting this interface are expected to support a clever file format when saving.

text:clever-file-format-mixin : ( class? . -> . class?)

argument extends/implements: | text%

result implements: | text:clever-file-format<%>

The result of this mixin uses the same initialization arguments as the mixin’s argument.
When files are saved from this text%, a check is made to see if there are any non-string-snip% objects in the text%. If so, it is saved using the file format 'std. (see set-file-format for more information. If not, the file format passed to save-file is used.

> ( send a-text:clever-file-format on-save-file |  | filename |  |  |  |
> |  | format) |  | → |  | void

> filename : path?
> format : ( one-of/c 'guess 'standard 'text 'text-force-cr 'same 'copy)

> Augments on-save-file in editor<%>.
> If the method get-file-format returns 'standard and the text has only string-snip%s, the file format is set to 'text.

> If the method get-file-format returns 'text and the text has some non string-snip%s, the file format is set to 'standard.

> Depending on the user’s preferences, the user may also be queried.

> Also, the changes to the file format only happen if the argument file-format is 'copy or 'same.

text:file<%> : interface?

implements: | editor:file<%>
| text:basic<%>

Mixins that implement this interface lock themselves when the file they are editing is read only.

> ( send a-text:file get-read-write?) → boolean?

> Indicates whether or not this editor is in read-write mode.

> ( send a-text:file while-unlocked thunk) → any/c
> thunk : (-> any/c)

> Unlocks the editor, calls the thunk, and then relocks the editor, all using a dynamic-wind.

text:file-mixin : ( class? . -> . class?)

argument extends/implements: | editor:file<%>
| text:basic<%>

result implements: | text:file<%>

> ( send a-text:file can-insert? start len) → boolean?
> start : number
> len : number

> Augments can-insert? in text%.
> Returns false if the result of get-read-write? is true, otherwise returns the result of calling inner.

> ( send a-text:file can-delete? start len) → boolean?
> start : number
> len : number

> Augments can-delete? in text%.
> Returns false if the result of get-read-write? is true, otherwise returns the result of calling inner.

> ( send a-text:file after-save-file) → void

> Augments after-save-file in editor<%>.
> Checks if the newly saved file is write-only in the filesystem. If so, locks the editor with the lock method. Otherwise unlocks the buffer

> For each canvas returned from get-canvases it checks to see if the canvas%’s get-top-level-window matches the frame:editor<%> interface. If so, it calls set-label with the last part of the filename (ie, the name of the file, not the directory the file is in).

> ( send a-text:file after-load-file) → void

> Augments after-load-file in editor<%>.
> Checks if the newly loaded file is write-only in the filesystem. If so, locks the editor with the lock method. Otherwise unlocks the buffer

> For each canvas returned from get-canvases it checks to see if the canvas%’s get-top-level-window matches the frame:editor<%> interface. If so, it calls set-label with the last part of the filename (ie, the name of the file, not the directory the file is in).

text:ports<%> : interface?

Classes implementing this interface (via the associated mixin) support input and output ports that read from the editor.
There are two input ports: the normal input port just reads from the editor’s contents directly and the box input port inserts an editor snip into this text and uses input typed into the box as input into the port.
They create three threads to mediate access to the input and output ports (one for each input port and one for all of the output ports).

> ( send a-text:ports delete/io start end) → void
> start : exact-integer
> end : exact-integer

> Deletes the text between start and end without changing the behavior of the ports (otherwise, deleting the text would break internal invariants of the port).

> Both start and end must be less than get-insertion-point (or else it is safe to delete them so you don’t need this method).

> ( send a-text:ports get-insertion-point) → exact-integer

> Returns the position where characters put into the output port will appear.

> ( send a-text:ports set-insertion-point ip) → void
> ip : exact-integer

> Sets the position where the output port will insert characters. See also get-insertion-point.

> ( send a-text:ports get-unread-start-point) → exact-integer

> Returns the position where input will be taken into the input port (after the next time return is typed).

> ( send a-text:ports set-unread-start-point usp) → void
> usp : exact-integer

> Sets the position where input will be taken into the input port (after the next time return is typed).

> See also get-unread-start-point.

> ( send a-text:ports set-allow-edits allow-edits?) → void
> allow-edits? : boolean?

> Enables or disables editing in the buffer. Be sure to update the unread start point (via set-unread-start-point) and the insertion point (via set-insertion-point) after making changes to the buffer.

> ( send a-text:ports get-allow-edits) → boolean?

> Indicates if editing is allowed in the buffer at this point.

> ( send a-text:ports insert-between str) → void
> str : (union snip% string)

> Inserts some text between the unread start point and the insertion point (and updates them properly). To insert before the two points, see insert-before.

> See also set-unread-start-point and set-insertion-point.

> ( send a-text:ports insert-before str) → void
> str : (union snip% string)

> Inserts some text before the unread start point and updates it and the insertion point properly. To insert between the two points, see insert-between.

> See also set-unread-start-point and set-insertion-point.

> ( send a-text:ports submit-to-port? key) → boolean?
> key : char

> Augment this method to help control when characters should be submitted to the input port.

> Return #t or the result of calling inner.

> ( send a-text:ports on-submit) → void

> This method is called when text is sent into the input port.

> Does nothing.

> ( send a-text:ports send-eof-to-in-port) → void

> This method puts an eof into the input port.

> ( send a-text:ports send-eof-to-box-in-port) → void

> This method puts an eof into the box input port.

> ( send a-text:ports reset-input-box) → void

> This method removes the current input box from the editor (and all input in it is lost).

> ( send a-text:ports clear-output-ports) → void

> Flushes all of the data in all of the output ports that hasn’t appeared in the editor yet.

> ( send a-text:ports clear-input-port) → void

> Flushes all of the data in the input port that hasn’t yet been read. Reading will now block.

> ( send a-text:ports clear-box-input-port) → void

> Flushes all of the data in the box input port that hasn’t yet been read. Reading will now block.

> ( send a-text:ports get-out-style-delta)
> → ( or/c ( is-a?/c style-delta%) string?)

> The result of this method is the style that is used to color text submitted to the result of get-out-port.

> If the result is a string that is not mapped in the editor’s style list, the style named "Standard" is used and if that isn’t mapped, the style named "Basic" is used.

> This method is called during the initialization of the class.

> Defaultly returns "text:ports out" which is mapped to a blue style in the style list returned by editor:get-standard-style-list.

> ( send a-text:ports get-err-style-delta)
> → ( or/c ( is-a?/c style-delta%) string?)

> The result of this method is the style that is used to color text submitted to the result of get-err-port.

> If the result is a string that is not mapped in the editor’s style list, the style named "Standard" is used and if that isn’t mapped, the style named "Basic" is used.

> This method is called during the initialization of the class.

> Defaultly returns "text:ports err" which is mapped to a red italic style in the style list returned by editor:get-standard-style-list.

> ( send a-text:ports get-value-style-delta)
> → ( or/c ( is-a?/c style-delta%) string?)

> The result of this method is the style (or the name of the style) that is used to color text submitted to the result of get-value-port.

> If the result is a string that is not mapped in the editor’s style list, the style named "Standard" is used and if that isn’t mapped, the style named "Basic" is used.

> This method is called during the initialization of the class.

> Defaultly returns "text:ports value" which is mapped to a blue style in the style list returned by editor:get-standard-style-list.

> ( send a-text:ports get-in-port) → input-port

> Returns the input port that data in this editor is sent to.

> ( send a-text:ports get-in-box-port) → input-port

> Returns the box input port that data in this editor is sent to.

> ( send a-text:ports get-out-port) → output-port

> Returns an output port that writes into this editor. The only difference between this port and the ports returned by get-err-port and get-value-port is the font style and color.

> ( send a-text:ports get-err-port) → output-port

> Returns an output port that writes into this editor. The only difference between this port and the ports returned by get-err-port and get-out-port is the font style and color.

> ( send a-text:ports get-value-port) → output-port

> Returns an output port that writes into this editor. The only difference between this port and the ports returned by get-err-port and get-out-port is the font style and color.

> ( send a-text:ports after-io-insertion) → void

> This method is called after an insertion due to IO occurs.

> ( send a-text:ports get-box-input-editor-snip%)
> → (subclass editor-snip%)

> The result of this method is used as the class of editor snips that is inserted by the box port in this editor.

> ( send a-text:ports get-box-input-text%)
> → ( is-a?/c text:input-box)

> The result of this method is instantiated and placed inside the result of get-box-input-editor-snip%.

text:ports-mixin : ( class? . -> . class?)

argument extends/implements: | text:wide-snip<%>

result implements: | text:ports<%>

> ( send a-text:ports can-insert? start len) → boolean?
> start : exact-integer
> len : exact-integer

> Augments can-insert? in text%.
> Returns the results of the inner call, unless get-allow-edits returns #f.

> ( send a-text:ports can-delete? start len) → boolean?
> start : exact-integer
> len : exact-integer

> Augments can-delete? in text%.
> Returns the results of the inner call, unless get-allow-edits returns #f.

> ( send a-text:ports on-local-char event) → void
> event : ( is-a?/c key-event%)

> Overrides on-local-char in editor<%>.
> Sends the data between the last position and the result of get-unread-start-point to the input port, unless submit-to-port? returns #f.

> Also calls on-submit.

> ( send a-text:ports on-display-size) → void

> Augments on-display-size in editor<%>.
> Adjusts the embedded editor-snip (used for reading input to the get-in-box-port) to match the width of the editor.

text:input-box<%> : interface?

implements: | text%

Classes that implement this interface are used as the editors for the box input port in text:ports%.

text:input-box-mixin : ( class? . -> . class?)

argument extends/implements: | text%

result implements: | text:input-box<%>

This mixin provides an implementation of text:input-box<%> for use with text:ports<%>.

> ( send a-text:input-box on-default-char event) → void
> event : key-event%

> Overrides on-default-char in text%.
> Notifies the text:ports<%> enclosing this editor that a new line of input has been provided.

text:autocomplete<%> : interface?

implements: | text%

The mixin implementing this interface provides an unintrusive autocompletion menu when a particular (configurable) keystroke is pressed.

> ( send a-text:autocomplete auto-complete) → void

> Starts a completion.

> ( send a-text:autocomplete get-autocomplete-border-color)
> → ( or/c string? ( is-a?/c color%))

> The border color for the autocomplete menu. Defaults to "black".

> ( send a-text:autocomplete get-autocomplete-background-color)
> → ( or/c string? ( is-a?/c color%))

> The background color for the non-selected menu items. Defaults to "lavender".

> ( send a-text:autocomplete get-autocomplete-selected-color)
> → ( or/c string? ( is-a?/c color%))

> The background color for the selected menu item. Defaults to ( make-object color% 204 153 255).

> ( send a-text:autocomplete completion-mode-key-event? key-event)
> → boolean?
> key-event : key-event%

> Returns true when the key event passed to it should initiate the completions menu.

> ( send a-text:autocomplete get-all-words) → ( listof string)

> Returns the list of the words that autocompletion should choose from.

> ( send a-text:autocomplete get-word-at pos) → string
> pos : positive-exact-integer

> Given an editor location, returns the prefix ending at that location that autocompletion should try to complete.

text:autocomplete-mixin : ( class? . -> . class?)

argument extends/implements: | text%

result implements: | text:autocomplete<%>

> ( send a-text:autocomplete on-paint) → void

> Overrides on-paint in editor<%>.
> Draws the completion menu (when it is popped up).

> ( send a-text:autocomplete on-char) → void

> Overrides on-char in editor<%>.
> Takes over the handling of key events when the completions menu is visible. Also, when the completions menu is not visible, it calls the completion-mode-key-event? method to see if it should start completing.

> ( send a-text:autocomplete on-event) → void

> Overrides on-event in editor<%>.
> This method is overridden to allow mouse access of the completions menu. It only handles events when there is a menu open and the mouse is in the menu, in which case it makes the menu trace the mouse.

> The only time it does not call the super method is when the mouse is button is pushed.

text:basic% : class?
superclass: ( text:basic-mixin ( editor:basic-mixin text%))

text:hide-caret/selection% : class?
superclass: ( text:hide-caret/selection-mixin text:basic%)

text:nbsp->space% : class?
superclass: ( text:nbsp->space-mixin text:basic%)

text:delegate% : class?
superclass: ( text:delegate-mixin text:basic%)

text:wide-snip% : class?
superclass: ( text:wide-snip-mixin text:basic%)

text:standard-style-list% : class?
superclass: ( editor:standard-style-list-mixin text:wide-snip%)

text:input-box% : class?
superclass: ( text:input-box-mixin text:standard-style-list%)

text:keymap% : class?
superclass: ( editor:keymap-mixin text:standard-style-list%)

text:return% : class?
superclass: ( text:return-mixin text:keymap%)

text:autowrap% : class?
superclass: ( editor:autowrap-mixin text:keymap%)

text:file% : class?
superclass: ( text:file-mixin ( editor:file-mixin text:autowrap%))

text:clever-file-format% : class?
superclass: ( text:clever-file-format-mixin text:file%)

text:backup-autosave% : class?
superclass: ( editor:backup-autosave-mixin text:clever-file-format%)

text:searching% : class?
superclass: ( text:searching-mixin text:backup-autosave%)

text:info% : class?
superclass: ( text:info-mixin ( editor:info-mixin text:searching%))

( text:range? arg) → boolean?
arg : any/c

Determines if arg is an instance of the range struct.

( text:range-start range) → exact-nonnegative-integer?
range : text:range?

Returns the start position of the range.

( text:range-end range) → exact-nonnegative-integer?
range : text:range?

Returns the end position of the range.

( text:range-caret-space? range) → boolean?
range : text:range?

Returns a boolean indicating where the caret-space in the range goes. See also highlight-range.

( text:range-style range) → exact-nonnegative-integer?
range : text:range?

Returns the style of the range. See also highlight-range.

( text:range-color range) → ( or/c string? ( is-a?/c color%))
range : text:range?

Returns the color of the highlighted range.

( text:autocomplete-append-after) → string?
( text:autocomplete-append-after suffix) → void?
suffix : string?

A string that is inserted after a completion is inserted by a text:autocomplete instance.

Defaults to "".

( text:autocomplete-limit) → ( and/c integer? exact? positive?)
( text:autocomplete-limit count) → void?
count : ( and/c integer? exact? positive?)

Controls the number of completions visible at a time in the menu produced by text:autocomplete instances.

Defaults to 15.

( text:get-completions/manuals manuals) → ( listof string?)
manuals : ( or/c false/c ( listof symbol?))

Returns the list of keywords for the manuals from manuals by extracting all of the documented exports of the manuals. The symbols are meant to be module paths, e.g., the quoted form of the argument to require.

If manuals is false, then all of the documented names are used.

( text:lookup-port-name manuals)
→ ( or/c ( is-a?/c editor:basic<%>) false/c)
manuals : symbol?

Returns the editor instance whose port-name matches the given symbol. If no editor can be found, then returns false.
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