forked from AuroraMiddleware/gtk
239 lines
16 KiB
Markdown
239 lines
16 KiB
Markdown
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# GTK CSS Properties
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GTK supports CSS properties and shorthands as far as they can be applied
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in the context of widgets, and adds its own properties only when needed.
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All GTK-specific properties have a -gtk prefix.
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## Basic types
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All properties support the following keywords: inherit, initial, unset,
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with the same meaning as defined in the
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[CSS Cascading and Inheritance](https://www.w3.org/TR/css3-cascade/#defaulting-keywords)
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spec.
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The following units are supported for basic datatypes:
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Length
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: px, pt, em, ex, rem, pc, in, cm, mm, calc()
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Percentage
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: %, calc()
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Angle
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: deg | grad | turn, calc()
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Time
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: s | ms, calc()
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Length values with the em or ex units are resolved using the font
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size value, unless they occur in setting the font-size itself, in
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which case they are resolved using the inherited font size value.
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The rem unit is resolved using the initial font size value, which is
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not quite the same as the CSS definition of rem.
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The calc() notation adds considerable expressive power. There are limits
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on what types can be combined in such an expression (e.g. it does not make
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sense to add a number and a time). For the full details, see the
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[CSS3 VAlues and Units](https://www.w3.org/TR/css3-values/#calc-notation)
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spec.
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A common pattern among shorthand properties (called 'four sides') is one
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where one to four values can be specified, to determine a value for each
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side of an area. In this case, the specified values are interpreted as
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follows:
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4 values:
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: top right bottom left
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3 values:
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: top horizontal bottom
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2 values:
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: vertical horizontal
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1 value:
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: all
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## Colors
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GTK extends the CSS syntax with several additional ways to specify colors.
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The first is a reference to a color defined via a @define-color rule in CSS.
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The syntax for @define-color rules is as follows:
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```
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@define-color Name Color
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```
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To refer to the color defined by a @define-color rule, prefix the name with @.
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GTK also supports color expressions, which allow colors to be transformed to
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new ones. Color expressions can be nested, providing a rich language to
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define colors. Color expressions resemble functions, taking 1 or more colors
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and in some cases a number as arguments.
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`lighter(Color)`
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: produces a brigher variant of Color
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`darker(Color)`
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: produces a darker variant of Color
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`shade(Color, Number)`
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: changes the lightness of Color. The number ranges from 0 for black to 2 for white.
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`alpha(Color, Number)`
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: replaces the alpha value of color with number (between 0 and 1)
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`mix(Color1, Color2, Number)`
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: interpolates between the two colors
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## Images
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GTK extends the CSS syntax for images and also uses it for specifying icons.
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To load a themed icon, use
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```
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-gtk-icontheme(Name)
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```
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The specified icon name is used to look up a themed icon, while taking into
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account the values of the -gtk-icon-palette property. This kind of image is
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mainly used as value of the -gtk-icon-source property.
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Symbolic icons from the icon theme are recolored according to the
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-gtk-icon-palette property, which defines a list of named colors.
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The recognized names for colors in symbolic icons are error, warning
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and success. The default palette maps these three names to symbolic
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colors with the names @error_color, @warning_color and @success_color
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respectively. The syntax for defining a custom palette is a comma-separated
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list of name-color pairs, e.g.
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```
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success blue, warning #fc3, error magenta
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```
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Recoloring is sometimes needed for images that are not part of an icon theme,
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and the
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```
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-gtk-recolor(uri, palette)
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```
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syntax makes this available. -gtk-recolor requires a url as first argument.
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The remaining arguments specify the color palette to use. If the palette is
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not explicitly specified, the current value of the -gtk-icon-palette property
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is used.
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GTK supports scaled rendering on hi-resolution displays. This works best if
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images can specify normal and hi-resolution variants. From CSS, this can be
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done with
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```
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-gtk-scaled(Image1, Image2)
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```
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## GTK CSS Properties
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| Property | Reference | Notes |
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|:-----------|:----------|:------|
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|color | [CSS Color Level 3](https://www.w3.org/TR/css3-color/#foreground) | |
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|opacity | [CSS Color Level 3](https://www.w3.org/TR/css3-color/#opacity) | |
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|filter | [CSS Filter Effect Level 1](https://drafts.fxtf.org/filters/#FilterProperty) | |
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|font-family | [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-family-prop) | defaults to gtk-font-name setting |
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|font-size | [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-size-prop) | defaults to gtk-font-name setting |
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|font-style | [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-style-prop) | |
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|font-variant| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#descdef-font-variant) | only CSS2 values supported |
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|font-weight | [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-weight-prop) | |
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|font-stretch| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-stretch-prop) | |
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|font-kerning| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-kerning-prop) | |
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|font-variant-ligatures| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-variant-ligatures-prop) | |
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|font-variant-position| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-variant-position-prop) | |
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|font-variant-caps| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-variant-position-prop) | |
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|font-variant-numeric| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-variant-numeric-prop) | |
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|font-variant-alternates| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-variant-alternates-prop) | |
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|font-variant-east-asian| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-variant-east-asian-prop) | |
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|font-feature-settings| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-feature-settings-prop) | |
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|font-variation-settings| [CSS Fonts Level 4](https://www.w3.org/TR/css-fonts-4/#font-variation-settings-def) | |
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|-gtk-dpi|[Number](https://www.w3.org/TR/css3-values/#number-value) | defaults to screen resolution |
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|font| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-prop) | CSS allows line-height, etc |
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|font-variant| [CSS Fonts Level 3](https://www.w3.org/TR/css3-fonts/#font-variant-prop) | |
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|caret-color|[CSS Basic User Interface Level 3](https://www.w3.org/TR/css3-ui/#caret-color) | CSS allows an auto value |
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|-gtk-secondary-caret-color|[Color](https://www.w3.org/TR/css-color-3/#valuea-def-color) | used for the secondary caret in bidirectional text |
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|letter-spacing| [CSS Text Level 3](https://www.w3.org/TR/css3-text/#letter-spacing) | |
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|text-decoration-line| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-decoration-line-property) | CSS allows overline |
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|text-decoration-color| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-decoration-color-property) | |
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|text-decoration-style| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-decoration-style-property) | CSS allows dashed and dotted |
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|text-shadow| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-shadow-property) | |
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|text-decoration| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-decoration-property) | |
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|-gtk-icon-source| [Image](https://www.w3.org/TR/css-backgrounds-3/#typedef-image), `builtin` or `none` | used for builtin icons in buttons and expanders |
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|-gtk-icon-size| [Length](https://www.w3.org/TR/css3-values/#length-value) | size used for builtin icons in buttons and expanders |
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|-gtk-icon-style| `requested`, `regular` or `symbolic` | preferred style for application-loaded icons |
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|-gtk-icon-transform| [Transform list](https://drafts.csswg.org/css-transforms-1/#typedef-transform-list) or `none` | applied to builtin and application-loaded icons |
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|-gtk-icon-palette| Color palette, as explained above | used to recolor symbolic icons |
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|-gtk-icon-shadow| [Shadow](https://www.w3.org/TR/css-backgrounds-3/#typedef-shadow) or `none` | applied to builtin and application-loaded icons |
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|-gtk-icon-filter| [Filter value list](https://www.w3.org/TR/filter-effects-1/#typedef-filter-value-list) or `none` | applied to builtin and application-loaded icons |
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|transform| [CSS Transforms Level 2](https://drafts.csswg.org/css-transforms-2/) | |
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|min-width| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#min-width) | CSS allows percentages |
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|min-height| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#min-height) | CSS allows percentages |
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|margin-top| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#margin-top) | CSS allows percentages or auto |
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|margin-right| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#margin-right) | CSS allows percentages or auto |
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|margin-bottom| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#margin-bottom) | CSS allows percentages or auto |
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|margin-left| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#margin-left) | CSS allows percentages or auto |
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|padding-top| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#padding-top) | CSS allows percentages |
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|padding-right| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#padding-right) | CSS allows percentages |
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|padding-bottom| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#padding-bottom) | CSS allows percentages |
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|padding-left| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#padding-left) | CSS allows percentages |
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|margin| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#margin) | a 'four sides' property |
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|padding| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#padding) | a 'four sides' property |
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|border-top-width| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-width) | CSS allows other values |
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|border-right-width| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-width) | CSS allows other values |
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|border-bottom-width| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-width) | CSS allows other values |
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|border-left-width| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-width) | CSS allows other values |
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|border-top-style| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-style) | |
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|border-right-style| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-style) | |
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|border-bottom-style| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-style) | |
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|border-left-style| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-style) | |
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|border-top-right-radius| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-radius) | |
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|border-bottom-right-radius| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-radius) | |
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|border-bottom-left-radius| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-radius) | |
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|border-top-left-radius| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-radius) | |
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|border-top-color| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-color) | |
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|border-right-color| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-color) | |
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|border-bottom-color| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-color) | |
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|border-left-color| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-color) | |
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|border-image-source| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-image-source) | |
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|border-image-repeat| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-image-repeat) | |
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|border-image-slice| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-image-slice) | a 'four sides' property |
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|border-image-width| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-image-width) | a 'four sides' property |
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|border-width| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-width) | a 'four sides' property |
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|border-style| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#the-border-style) | a 'four sides' property |
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|border-color| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border-color) | a 'four sides' property |
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|border-top| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border-top) | |
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|border-right| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border-right) | |
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|border-bottom| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border-bottom) | |
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|border-left| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border-left) | |
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|border| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border) | |
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|border-radius| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border-radius) | |
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|border-image| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#border-image) | |
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|outline-style| [CSS Basic User Interface Level 3](https://www.w3.org/TR/css3-ui/#outline-style) | initial value is none, auto is not supported |
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|outline-width| [CSS Basic User Interface Level 3](https://www.w3.org/TR/css3-ui/#outline-width) | |
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|outline-color| [CSS Basic User Interface Level 3](https://www.w3.org/TR/css3-ui/#outline-color) | initial value is currentColor, invert is not supported |
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|outline-offset| [CSS Basic User Interface Level 3](https://www.w3.org/TR/css3-ui/#outline-offset) | |
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|outline| [CSS Basic User Interface Level 3](https://www.w3.org/TR/css3-ui/#propdef-outline) | |
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|background-color| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background-color) | |
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|background-clip| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background-clip) | |
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|background-origin| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background-origin) | |
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|background-size| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background-size) | |
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|background-position| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background-position) | |
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|background-repeat| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background-repeat) | |
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|background-image| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background-image) | not supported: urls without quotes, colors in crossfades |
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|box-shadow| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#box-shadow) | |
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|background-blend-mode| [CSS Compositing and Blending Level 1](https://www.w3.org/TR/compositing-1/#propdef-background-blend-mode) | only affects multiple backgrounds |
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|background| [CSS Backgrounds and Borders Level 3](https://www.w3.org/TR/css3-background/#background) | |
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|transition-property| [CSS Transitions](https://www.w3.org/TR/css3-transitions/#transition-property) | |
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|transition-duration| [CSS Transitions](https://www.w3.org/TR/css3-transitions/#transition-duration) | |
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|transition-timing-function| [CSS Transitions](https://www.w3.org/TR/css3-transitions/#transition-timing-function) | |
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|transition-delay| [CSS Transitions](https://www.w3.org/TR/css3-transitions/#transition-delay) | |
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|transition| [CSS Transitions](https://www.w3.org/TR/css3-transitions/#transition) | |
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|animation-name| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-name) | |
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|animation-duration| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-duration) | |
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|animation-timing-function| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-timing-function) | |
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|animation-iteration-count| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-iteration-count) | |
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|animation-direction| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-direction) | |
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|animation-play-state| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-play-state) | |
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|animation-delay| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-delay) | |
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|animation-fill-mode| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-fill-mode) | |
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|animation| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation) | |
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|border-spacing| [CSS Table Level 3](https://www.w3.org/TR/css-tables-3/#border-spacing-property) | respected by GtkBox and GtkGrid |
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