► |  | The Racket Graphical Interface Toolkit

1 | Windowing
2 | Widget Gallery
3 | Windowing Classes
4 | Windowing Functions
5 | Editors
6 | Snip and Style Classes
7 | Editor Classes
8 | Editor Functions
9 | WXME Decoding
10 | Preferences
11 | Dynamic Loading
12 | Startup Actions
13 | Init Libraries
14 | Platform Dependencies
| Index

▼ | 6 | Snip and Style Classes

6.1 | add-color<%>
6.2 | image-snip%
6.3 | mult-color<%>
6.4 | readable-snip<%>
6.5 | snip%
6.6 | snip-admin%
6.7 | snip-class%
6.8 | snip-class-list<%>
6.9 | string-snip%
6.10 | style<%>
6.11 | style-delta%
6.12 | style-list%
6.13 | tab-snip%

On this page:

get-alignment
get-background
get-base-style
get-delta
get-face
get-family
get-font
get-foreground
get-name
get-shift-style
get-size
get-size-in-pixels
get-smoothing
get-style
get-text-descent
get-text-height
get-text-space
get-text-width
get-transparent-text-backing
get-underlined
get-weight
is-join?
set-base-style
set-delta
set-shift-style
switch-to

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> interface

> style<%> : interface?

A style<%> object encapsulates drawing information (font, color, alignment, etc.) in a hierarchical manner. A style<%> object always exists within the context of a style-list% object and is never created except by a style-list% object.

See also Styles.

> > method

> > (send a-style get-alignment) → (or/c 'top 'center 'bottom)

Returns the style’s alignment: 'top, 'center, or 'bottom.

> > method

> > (send a-style get-background) → (is-a?/c color%)

Returns the style’s background color.

> > method

> > (send a-style get-base-style) → (or/c (is-a?/c style<%>) #f)

Returns the style’s base style. See Styles for more information. The return value is #f only for the basic style in the list.

> > method

> > (send a-style get-delta delta) → void?

> delta : (is-a?/c style-delta%)

Mutates delta, changing it to match the style’s delta, if the style is not a join style. See Styles for more information.

> > method

> > (send a-style get-face) → (or/c string? #f)

Returns the style’s face name. See font%.

> > method

> > (send a-style get-family)

> →

> (or/c 'default 'decorative 'roman 'script
> 'swiss 'modern 'symbol 'system)

Returns the style’s font family. See font%.

> > method

> > (send a-style get-font) → (is-a?/c font%)

Returns the style’s font information.

> > method

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

Returns the style’s foreground color.

> > method

> > (send a-style get-name) → (or/c string? #f)

Returns the style’s name, or #f if it is unnamed. Style names are only set through the style’s style-list% object.

> > method

> > (send a-style get-shift-style) → (is-a?/c style<%>)

Returns the style’s shift style if it is a join style. Otherwise, the root style is returned. See Styles for more information.

> > method

> > (send a-style get-size) → byte?

Returns the style’s font size.

> > method

> > (send a-style get-size-in-pixels) → boolean?

Returns #t if the style size is in pixels, instead of points, or #f otherwise.

> > method

> > (send a-style get-smoothing)

> → (or/c 'default 'partly-smoothed 'smoothed 'unsmoothed)

Returns the style’s font smoothing. See font%.

> > method

> > (send a-style get-style) → (or/c 'normal 'italic 'slant)

Returns the style’s font style. See font%.

> > method

> > (send a-style get-text-descent dc)

> → (and/c real? (not/c negative?))
> dc : (is-a?/c dc<%>)

Returns the descent of text using this style in a given DC.

> > method

> > (send a-style get-text-height dc)

> → (and/c real? (not/c negative?))
> dc : (is-a?/c dc<%>)

Returns the height of text using this style in a given DC.

> > method

> > (send a-style get-text-space dc)

> → (and/c real? (not/c negative?))
> dc : (is-a?/c dc<%>)

Returns the vertical spacing for text using this style in a given DC.

> > method

> > (send a-style get-text-width dc)

> → (and/c real? (not/c negative?))
> dc : (is-a?/c dc<%>)

Returns the width of a space character using this style in a given DC.

> > method

> > (send a-style get-transparent-text-backing) → boolean?

Returns #t if text is drawn without erasing the text background or #f otherwise.

> > method

> > (send a-style get-underlined) → boolean?

Returns #t if the style is underlined or #f otherwise.

> > method

> > (send a-style get-weight) → (or/c 'normal 'bold 'light)

Returns the style’s font weight. See font%.

> > method

> > (send a-style is-join?) → boolean?

Returns #t if the style is a join style or #f otherwise. See Styles for more information.

> > method

> > (send a-style set-base-style base-style) → void?

> base-style : (is-a?/c style<%>)

Sets the style’s base style and recomputes the style’s font, etc. See Styles for more information.

> > method

> > (send a-style set-delta delta) → void?

> delta : (is-a?/c style-delta%)

Sets the style’s delta (if it is not a join style) and recomputes the style’s font, etc. See Styles for more information.

> > method

> > (send a-style set-shift-style style) → void?

> style : (is-a?/c style<%>)

Sets the style’s shift style (if it is a join style) and recomputes the style’s font, etc. See Styles for more information.

> > method

> > (send a-style switch-to dc old-style) → void?

> dc : (is-a?/c dc<%>)
> old-style : (or/c (is-a?/c style<%>) #f)

Sets the font, pen color, etc. of the given drawing context. If oldstyle is not #f, only differences between the given style and this one are applied to the drawing context.
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