See set-tabs for information about tabstops.

If auto-wrap is true, then auto-wrapping is enabled via auto-wrap.

A new keymap% object is created for the new editor. See also get-keymap and set-keymap.

A new style-list% object is created for the new editor. See also get-style-list and set-style-list.

See also can-change-style? and on-edit-sequence.

No internals locks are set when this method is called.

Default implementation: Does nothing.

The start argument specifies the starting position of the deleted range. The len argument specifies number of deleted items (so start+len is the ending position of the deleted range).

See also can-delete? and on-edit-sequence.

No internals locks are set when this method is called.

Default implementation: Does nothing.

The start argument specifies the position of the insert. The len argument specifies the total length (in positions) of the inserted items.

See also can-insert? and on-edit-sequence.

No internals locks are set when this method is called.

Default implementation: Does nothing.

The pos argument specifies the position within the editor where the snips were merged (i.e., one old snip was just before pos, one old was just after pos, and the new snip spans pos).

See also merge-with.

Default implementation: Does nothing.

See also on-edit-sequence.

Default implementation: Does nothing.

(This callback method is provided because setting an editor’s maximum width may cause lines to be re-flowed with soft carriage returns.)

See also can-set-size-constraint? and on-edit-sequence.

Default implementation: Does nothing.

The pos argument specifies the position within the editor where a snip was split.

Default implementation: Does nothing.

The editor is internally locked for writing during a call to this method (see also Internal Editor Locks). Use after-change-style to modify the editor, if necessary.

See also on-change-style, after-change-style, and on-edit-sequence.

Default implementation: Returns #t.

The start argument specifies the starting position of the range to delete. The len argument specifies number of items to delete (so start+len is the ending position of the range to delete).

The editor is internally locked for writing during a call to this method (see also Internal Editor Locks). Use after-delete to modify the editor, if necessary.

See also on-delete, after-delete, and on-edit-sequence.

Default implementation: Returns #t.

The start argument specifies the position of the potential insert. The len argument specifies the total length (in positions) of the items to be inserted.

The editor is internally locked for writing during a call to this method (see also Internal Editor Locks). Use after-insert to modify the editor, if necessary.

See also on-insert, after-insert, and on-edit-sequence.

Default implementation: Returns #t.

(This callback method is provided because setting an editor’s maximum width may cause lines to be re-flowed with soft carriage returns.)

See also on-set-size-constraint, after-set-size-constraint, and on-edit-sequence.

Default implementation: Returns #t.

See also hide-caret.

When style is provided: The editor’s style list must contain style, otherwise the style is not changed. See also convert in style-list%.

See Cut and Paste Time Stamps for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:fail:contract exception is raised.

See Cut and Paste Time Stamps for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:fail:contract exception is raised.

The content of an editor can be changed by the system in response to other method calls, and such changes do not go through this method; use on-delete to monitor content deletion changes.

See Cut and Paste Time Stamps for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:fail:contract exception is raised.

Default implementation: Copy the data from start to end, extending the current clipboard contexts if extend? is not #f.

See Cut and Paste Time Stamps for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:fail:contract exception is raised.

Default implementation: Pastes into the position start.

See Cut and Paste Time Stamps for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:fail:contract exception is raised.

Default implementation: Pastes into the position start.

See also delete.

The on-it? box is filled with #t if the line actually touches this position, or #f otherwise, unless on-it? is #f. (A large enough y will always return the last line number, but will set on-it? to #f.)

The result is only valid when the editor is displayed (see Editor Structure and Terminology). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).

See End of Line Ambiguity for a discussion of the at-eol? argument. The on-it? box is filled with #t if the line actually touches this position, or #f otherwise, unless on-it? is #f.

The edge-close? box is filled with it will be filled in with a value indicating how close the point is to the vertical edges of the item when the point falls on the item, unless edge-close? is #f. If the point is closest to the left edge of the item, the value will be negative; otherwise, the value will be positive. In either case, then absolute value of the returned result is the distance from the point to the edge of the item. The values 100 and -100 indicate infinity.

The result is only valid when the editor is displayed (see Editor Structure and Terminology). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).

See End of Line Ambiguity for a discussion of the at-eol? argument. The on-it? box is filled with #t if the line actually touches this position, or #f otherwise, unless on-it? is #f.

See find-position for a discussion of edge-close?.

The result is only valid when the editor is displayed (see Editor Structure and Terminology). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).

The s-pos box is filled with the position where the returned snip starts, unless s-pos is #f.

The direction argument can be 'forward or 'backward, indicating a forward search or backward search respectively. In the case of a forward search, the return value is the starting position of the string; for a backward search, the ending position is returned. However, if get-start? is #f, then the other end of the string position will be returned.

The start and end arguments set the starting and ending positions of a forward search (use start > end for a backward search). If start is 'start, then the search starts at the start of the selection. If end is 'eof, then the search continues to the end (for a forward search) or start (for a backward search) of the editor.

If case-sensitive? is #f, then an uppercase and lowercase of each alphabetic character are treated as equivalent.

The contents of the start argument specifies an position to start searching backwards to the next word start; its will be filled with the starting position of the word that is found. If start is #f, no backward search is performed.

The contents of the end argument specifies an position to start searching forwards to the next word end; its will be filled with the ending position of the word that is found. If end is #f, no forward search is performed.

The reason argument specifies more information about what the wordbreak is used for. For example, the wordbreaks used to move the caret may be different from the wordbreaks used to break lines. The possible values of reason are:

• 'caret – find a wordbreak suitable for moving the caret

• 'line – find a wordbreak suitable for breaking lines

• 'selection – find a wordbreak suitable for selecting the closest word

• 'user1 – for other (not built-in) uses

• 'user2 – for other (not built-in) uses

The actual handling of reason is controlled by the current wordbreak procedure; see set-wordbreak-funcfor details. The default handler and default wordbreak map treats alphanumeric characters the same for 'caret, 'line, and 'selection. Non-alphanumeric, non-space, non-hyphen characters do not break lines, but do break caret and selection words. For example a comma should not be counted as part of the preceding word for moving the caret past the word or double-clicking the word, but the comma should stay on the same line as the word (and thus counts in the same “line word”).

See End of Line Ambiguity for a discussion of the at-eol? argument. If scroll? is not #f, the editor’s display will be scrolled if necessary to show the hilited region. If timeout is greater than 0, then the hiliting will be automatically turned off after the given number of milliseconds.

See also flash-off.

See also set-between-threshold.

If start is greater than or equal to the last position, #\nul is returned.

See also get-start-position and get-end-position.

The start box is filled with the starting position of the selection, unless start is #f. The end box is filled with the ending position of the selection, unless end is #f.

This method is not called when the whole editor is saved to a file. In such cases, the information can be stored in the header or footer; see Global Data: Headers and Footers.

This method is meant to be overridden; the default set-region-data method does not store information to be retrieved by this method.

The pos box is filled with starting position of snip, unless pos is #f. The x box is filled with left location of snip in editor coordinates, unless x is #f. The y box is filled with top location of snip in editor coordinates, unless y is #f.

When location information is requested: The result is only valid when the editor is displayed (see Editor Structure and Terminology). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).

With non-sticky styles, text inserted into an editor always gets the style in the editor’s style list named by default-style-name.

See also set-styles-sticky.

The length box is filled with the length of the tab array (and therefore the returned list), unless length is #f. The tab-width box is filled with the width used for tabs past the end of the tab array, unless tab-width is #f. The in-units box is filled with #t if the tabs are specified in canvas units or #f if they are specified in space-widths, unless in-units is #f.

See also set-tabs.

If flattened? is not #f, then flattened text is returned. See Flattened Text for a discussion of flattened vs. non-flattened text.

If force-cr? is not #f and flattened? is not #f, then automatic carriage returns (from word-wrapping) are written into the return string as real carriage returns.

The result is only valid when the editor is displayed (see Editor Structure and Terminology). For text% objects, calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?).

The start box is filled with first line visible to the user, unless start is #f. The end box is filled with last line visible to the user, unless end is #f.

If the editor is displayed by multiple canvases and all? is #t, then the computed range includes all visible lines in all displays. Otherwise, the range includes only the visible lines in the current display.

The result is only valid when the editor is displayed (see Editor Structure and Terminology). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).

The start box is filled with first position visible to the user, unless start is #f. The end box is filled with last position visible to the user, unless end is #f.

If the editor is displayed by multiple canvases and all? is #t, then the computed range includes all visible positions in all displays. Otherwise, the range includes only the visible positions in the current display.

The result is only valid when the editor is displayed (see Editor Structure and Terminology). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).

If hide? is not #f, then the caret or selection hiliting will not be drawn for the editor. The editor can still own the keyboard focus, but no caret will be drawn to indicate the focus.

See also caret-hidden? and lock.

When a snip is provided: The snip cannot be inserted into multiple editors or multiple times within a single editor. As the snip is inserted, its current style is converted to one in the editor’s style list; see also convert.

When a char is provided: Multiple calls to the character-inserting method are grouped together for undo purposes, since this case of the method is typically used for handling user keystrokes. However, this undo-grouping feature interferes with the undo grouping performed by begin-edit-sequence and end-edit-sequence, so the string-inserting method should be used instead during undoable edit sequences.

When start is not provided, the current selection start is used. If the current selection covers a range of items, then char replaces the selected text. The selection’s start and end positions are moved to the end of the inserted character.

For a case where end is not provided and has no default, the current selection end is used. Otherwise, if end is not 'same, then the inserted value replaces the region from start to end, and the selection is left at the end of the inserted text. Otherwise, if the insertion position is before or equal to the selection’s start/end position, then the selection’s start/end position is incremented by the length of str.

If scroll-ok? is not #f and start is the same as the current selection’s start position, then the editor’s display is scrolled to show the new selection position.

See also get-styles-sticky.

See Cut and Paste Time Stamps for a discussion of the time argument. If time is outside the platform-specific range of times, an exn:fail:contract exception is raised.

See also paragraph-start-position, which operates on paragraphs (determined by explicit newline characters) instead of lines (determined by both explicit newline characters and automatic line-wrapping).

Calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?). If the editor is not displayed and the editor has a maximum width, line breaks are calculated as for line-start-position (which handles specially the case of no display when the editor has a maximum width).

Calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?).

If there are fewer than line-1 lines, the end of the last line is returned. If line is less than 0, then the end of the first line is returned.

If the line ends with invisible items (such as a carriage return) and visible? is not #f, the first position before the invisible items is returned.

See also paragraph-start-position, which operates on paragraphs (determined by explicit newline characters) instead of lines (determined by both explicit newline characters and automatic line-wrapping).

Calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?). If the editor is not displayed and the editor has a maximum width, line breaks are calculated as for line-start-position (which handles specially the case of no display when the editor has a maximum width).

Calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?). If the editor is not displayed and the editor has a maximum width, line breaks are calculated as for line-start-position (which handles specially the case of no display when the editor has a maximum width).

If top? is not #f, the location for the top of the line is returned; otherwise, the location for the bottom of the line is returned.

See also paragraph-start-position, which operates on paragraphs (determined by explicit newline characters) instead of lines (determined by both explicit newline characters and automatic line-wrapping).

The result is only valid when the editor is displayed (see Editor Structure and Terminology). Calling this method may force the recalculation of location information, even if the editor currently has delayed refreshing (see refresh-delayed?).

Calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?). If the editor is not displayed and the editor has a maximum width, line breaks are calculated as for line-start-position (which handles specially the case of no display when the editor has a maximum width).

If there are fewer than line-1 lines, the start of the last line is returned. If line is less than 0, then the start of the first line is returned.

If the line starts with invisible items and visible? is not #f, the first position past the invisible items is returned.

See also paragraph-start-position, which operates on paragraphs (determined by explicit newline characters) instead of lines (determined by both explicit newline characters and automatic line-wrapping).

Calling this method may force the recalculation of location information if a maximum width is set for the editor, even if the editor currently has delayed refreshing (see refresh-delayed?).

then this method ignores the editor’s maximum width and any automatic line breaks it might imply. If the first two of the above conditions are true and the editor was formerly displayed, this method uses the line breaks from the most recent display of the editor. (Insertions or deletions since the display shift line breaks within the editor in the same way as items.)

The possible values for code are:

• 'home – go to start of file

• 'end – go to end of file

• 'right – move right

• 'left – move left

• 'up – move up

• 'down – move down

If extend? is not #f, the selection range is extended instead of moved. If anchoring is on (see get-anchor and set-anchor), then extend? is effectively forced to #t.

The possible values for kind are:

• 'simple – move one item or line

• 'word – works with 'right or 'left

• 'page – works with 'up or 'down

• 'line – works with 'right or 'left; moves to the start or end of the line

See also set-position.

The editor is internally locked for writing during a call to this method (see also Internal Editor Locks). Use after-change-style to modify the editor, if necessary.

See also on-edit-sequence.

Default implementation: Does nothing.

• Delete and Backspace – calls delete.

• The arrow keys, Page Up, Page Down, Home, and End (including shifted versions) – moves the selection position with move-position.

• Any other character in the range (integer->char 32) to (integer->char 255) – inserts the character into the editor.

Note that an editor’s editor-canvas% normally handles mouse wheel events (see also on-char ).