►GUI: Racket Graphics Toolkit
►2 Reference
▼2.5 Editor Classes
On this page:
adjust-cursor
border-visible?
get-align-top-line
get-editor
get-extent
get-inset
get-margin
get-max-height
get-max-width
get-min-height
get-min-width
get-tight-text-fit
resize
set-align-top-line
set-editor
set-inset
set-margin
set-max-height
set-max-width
set-min-height
set-min-width
set-tight-text-fit
show-border
style-background-used?
use-style-background
Inherited methods:
from snip%
blink-caret
can-do-edit-operation?
copy
do-edit-operation
draw
find-scroll-step
get-admin
get-count
get-flags
get-num-scroll-steps
get-scroll-step-offset
get-snipclass
get-style
get-text
get-text!
is-owned?
match?
merge-with
next
on-char
on-event
own-caret
partial-offset
previous
release-from-owner
set-admin
set-count
set-flags
set-snipclass
set-style
set-unmodified
size-cache-invalid
split
write
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editor-snip% : class?

  superclass: snip%

An editor-snip% object is a snip% object that contains and displays an editor<%> object. This snip class is used to insert an editor as a single item within another editor.

(new editor-snip% [[editor editor] 
  [with-border? with-border?] 
  [left-margin left-margin] 
  [top-margin top-margin] 
  [right-margin right-margin] 
  [bottom-margin bottom-margin] 
  [left-inset left-inset] 
  [top-inset top-inset] 
  [right-inset right-inset] 
  [bottom-inset bottom-inset] 
  [min-width min-width] 
  [max-width max-width] 
  [min-height min-height] 
  [max-height max-height]]) 
 → (is-a?/c editor-snip%)
  editor : (or/c (is-a?/c text%) false/c) = #f
  with-border? : any/c = #t
  left-margin : exact-nonnegative-integer? = 5
  top-margin : exact-nonnegative-integer? = 5
  right-margin : exact-nonnegative-integer? = 5
  bottom-margin : exact-nonnegative-integer? = 5
  left-inset : exact-nonnegative-integer? = 1
  top-inset : exact-nonnegative-integer? = 1
  right-inset : exact-nonnegative-integer? = 1
  bottom-inset : exact-nonnegative-integer? = 1
  min-width : (or/c (and/c real? (not/c negative?)) (one/of 'none))
   = 'none
  max-width : (or/c (and/c real? (not/c negative?)) (one/of 'none))
   = 'none
  min-height : (or/c (and/c real? (not/c negative?)) (one/of 'none))
   = 'none
  max-height : (or/c (and/c real? (not/c negative?)) (one/of 'none))
   = 'none
If editor is non-#f, then it will be used as the editor contained by the snip. See also set-editor.

If with-border? is not #f, then a border will be drawn around the snip. The editor display will be inset in the snip area by the amounts specified in the -margin arguments. The border will be drawn with an inset specified by the -inset arguments.

See get-inset and get-margin for information about the inset and margin arguments.

(send an-editor-snip adjust-cursor dc 
  x 
  y 
  editorx 
  editory 
  event) 
 → (or/c (is-a?/c cursor%) false/c)
  dc : (is-a?/c dc<%>)
  x : real?
  y : real?
  editorx : real?
  editory : real?
  event : (is-a?/c mouse-event%)
Overrides adjust-cursor in snip%.
Gets a cursor from the embedded editor by calling its adjust-cursor method.

(send an-editor-snip border-visible?) → boolean?
Returns #t if the snip has a border draw around it, #f otherwise.

See also show-border.

(send an-editor-snip get-align-top-line) → boolean?
Reports whether the snip is in align-top-line mode. See get-extent for more information.

See also set-align-top-line.

(send an-editor-snip get-editor)
 → (or/c (or/c (is-a?/c text%) (is-a?/c pasteboard%)) false/c)
Returns the editor contained by the snip, or #f is there is no editor.

(send an-editor-snip get-extent dc    
  x    
  y    
  [w    
  h    
  descent    
  space    
  lspace    
  rspace]) → void?
  dc : (is-a?/c dc<%>)
  x : real?
  y : real?
  w : (or/c (box/c (and/c real? (not/c negative?))) false/c)
   = #f
  h : (or/c (box/c (and/c real? (not/c negative?))) false/c)
   = #f
  descent : (or/c (box/c (and/c real? (not/c negative?))) false/c)
   = #f
  space : (or/c (box/c (and/c real? (not/c negative?))) false/c)
   = #f
  lspace : (or/c (box/c (and/c real? (not/c negative?))) false/c)
   = #f
  rspace : (or/c (box/c (and/c real? (not/c negative?))) false/c)
   = #f
Overrides get-extent in snip%.
Calls its editor’s get-extent method, then adds the editor snip’s margins.

The top space always corresponds to the space of the editor’s top line, plus the snip’s top margin. Normally, the descent corresponds to the descent of the editor’s last line plus the snip’s bottom margin. However, if the snip is in align-top-line mode (see set-align-top-line), the descent corresponds to the descent of the top line, plus the height rest of the editor’s lines, plus the snip’s bottom margin.

If the editor is a text editor, then 1 is normally subtracted from the editor’s width as returned by get-extent, because the result looks better for editing. If the snip is in tight-text-fit mode (see set-tight-text-fit) then 2 is subtracted from a text editor’s width, eliminating the two pixels that the text editor reserves for the blinking caret. In addition, tight-text-fit mode subtracts an amount equal to the line spacing from the editor’s height. By default, tight-text-fit mode is disabled.

(send an-editor-snip get-inset l t r b) → void?
  l : (box/c exact-nonnegative-integer?)
  t : (box/c exact-nonnegative-integer?)
  r : (box/c exact-nonnegative-integer?)
  b : (box/c exact-nonnegative-integer?)
Gets the current border insets for the snip. The inset sets how much space is left between the edge of the snip and the border.

The l box is filled with left inset. The t box is filled with top inset. The r box is filled with right inset. The b box is filled with bottom inset.

(send an-editor-snip get-margin l t r b) → void?
  l : (box/c exact-nonnegative-integer?)
  t : (box/c exact-nonnegative-integer?)
  r : (box/c exact-nonnegative-integer?)
  b : (box/c exact-nonnegative-integer?)
Gets the current margins for the snip. The margin sets how much space is left between the edge of the editor’s contents and the edge of the snip.

The l box is filled with left margin. The t box is filled with top margin. The r box is filled with right margin. The b box is filled with bottom margin.

(send an-editor-snip get-max-height)
 → (or/c (and/c real? (not/c negative?)) (one/of 'none))
Gets the maximum display height of the snip; zero or 'none indicates that there is no maximum.

(send an-editor-snip get-max-width)
 → (or/c (and/c real? (not/c negative?)) (one/of 'none))
Gets the maximum display width of the snip; zero or 'none indicates that there is no maximum.

(send an-editor-snip get-min-height)
 → (or/c (and/c real? (not/c negative?)) (one/of 'none))
Gets the minimum display height of the snip; zero or 'none indicates that there is no minimum.

(send an-editor-snip get-min-width)
 → (or/c (and/c real? (not/c negative?)) (one/of 'none))
Gets the minimum display width of the snip; zero or 'none indicates that there is no minimum.

(send an-editor-snip get-tight-text-fit) → boolean?
Reports whether the snip is in tight-text-fit mode. See get-extent for more information.

See also set-tight-text-fit.

(send an-editor-snip resize w h) → boolean?
  w : (and/c real? (not/c negative?))
  h : (and/c real? (not/c negative?))
Overrides resize in snip%.
Sets the snip’s minimum and maximum width and height to the specified values minus the snip border space. See also set-min-width set-max-width set-max-height set-min-height.

Also sets the minimum and maximum width of the editor owned by the snip to the given width (minus the snip border space) via set-max-width and set-min-width.

(send an-editor-snip set-align-top-line tight?) → void?
  tight? : any/c
Enables or disables align-top-line mode. See get-extent for more information.

See also get-align-top-line.

(send an-editor-snip set-editor editor) → void?
  editor : (or/c (or/c (is-a?/c text%) (is-a?/c pasteboard%)) false/c)
Sets the editor contained by the snip, releasing the old editor in the snip (if any). If the new editor already has an administrator, then the new editor is not installed into the snip.

When an editor-snip% object is not inserted in an editor, it does not have an administrator. During this time, it does not give its contained editor an administrator, either. The administratorless contained editor can therefore “defect” to some other display with an administrator. When a contained editor defects and the snip is eventually inserted into a different editor, the snip drops the traitor contained editor, setting its contained editor to #f.

(send an-editor-snip set-inset l t r b) → void?
  l : exact-nonnegative-integer?
  t : exact-nonnegative-integer?
  r : exact-nonnegative-integer?
  b : exact-nonnegative-integer?
Sets the current border insets for the snip. The inset sets how much space is left between the edge of the snip and the border.

(send an-editor-snip set-margin l t r b) → void?
  l : exact-nonnegative-integer?
  t : exact-nonnegative-integer?
  r : exact-nonnegative-integer?
  b : exact-nonnegative-integer?
Sets the current margins for the snip. The margin sets how much space is left between the edge of the editor’s contents and the edge of the snip.

(send an-editor-snip set-max-height h) → void?
  h : (or/c (and/c real? (not/c negative?)) (one/of 'none))
An editor-snip% normally stretches to wrap around the size of the editor it contains. This method limits the height of the snip (and if the editor is larger, only part of the editor is displayed).

Zero or 'none disables the limit.

(send an-editor-snip set-max-width w) → void?
  w : (or/c (and/c real? (not/c negative?)) (one/of 'none))
An editor-snip% normally stretches to wrap around the size of the editor it contains. This method limits the width of the snip (and if the editor is larger, only part of the editor is displayed). The contained editor’s width limits are not changed by this method.

Zero or 'none disables the limit.

(send an-editor-snip set-min-height h) → void?
  h : (or/c (and/c real? (not/c negative?)) (one/of 'none))
An editor-snip% normally stretches to wrap around the size of the editor it contains. This method sets the minimum height of the snip (and if the editor is smaller, the editor is top-aligned in the snip).

Zero or 'none disables the limit.

(send an-editor-snip set-min-width w) → void?
  w : (or/c (and/c real? (not/c negative?)) (one/of 'none))
An editor-snip% normally stretches to wrap around the size of the editor it contains. This method sets the minimum width of the snip (and if the editor is smaller, the editor is left-aligned in the snip). The contained editor’s width limits are not changed by this method.

Zero or 'none disables the limit.

(send an-editor-snip set-tight-text-fit tight?) → void?
  tight? : any/c
Enables or disables tight-text-fit mode. See get-extent for more information.

See also get-tight-text-fit.

(send an-editor-snip show-border show?) → void?
  show? : any/c
Shows or hides the snip’s border.

(send an-editor-snip style-background-used?) → boolean?
Returns #t if the snip uses its style’s background and transparency information when drawing, #f otherwise.

See also use-style-background.

(send an-editor-snip use-style-background use?) → void?
  use? : any/c
Causes the snip to use or not used (the default) its style’s background and transparency information for drawing the background within the snip’s border.

If use? is #f, the style background and transparency information is ignored, otherwise is it used.

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