Maintainer	gtk2hs-users@lists.sourceforge.net
Stability	provisional
Portability	portable (depends on GHC)
Safe Haskell	None
Language	Haskell98

Graphics.Rendering.Pango.Enums

Description

Enumerations for describing font characteristics.

Synopsis

Documentation

type PangoUnit = Double Source

pangoScale :: Double Source

data Color Source

Color

Specifies a color with three integer values for red, green and blue. All values range from 0 (least intense) to 65535 (highest intensity).

Constructors

Color Word16 Word16 Word16

Instances

Eq Color
Show Color

data Rectangle Source

Rectangle

Specifies x, y, width and height

Constructors

Rectangle Int Int Int Int

Instances

Eq Rectangle
Show Rectangle

data PangoRectangle Source

Rectangles describing an area in Doubles.

Specifies x, y, width and height

Constructors

PangoRectangle Double Double Double Double

Instances

Show PangoRectangle
Storable PangoRectangle

data FontMetrics Source

The characteristic measurements of a font.

All values are measured in pixels.
In Pango versions before 1.6 only ascent, descent, approximateCharWidth and approximateDigitWidth are available.

Constructors

FontMetrics

Fields

ascent :: Double: The ascent is the distance from the baseline to the logical top of a line of text. (The logical top may be above or below the top of the actual drawn ink. It is necessary to lay out the text to figure where the ink will be.)
descent :: Double: The descent is the distance from the baseline to the logical bottom of a line of text. (The logical bottom may be above or below the bottom of the actual drawn ink. It is necessary to lay out the text to figure where the ink will be.)
approximateCharWidth :: Double: The approximate character width. This is merely a representative value useful, for example, for determining the initial size for a window. Actual characters in text will be wider and narrower than this.
approximateDigitWidth :: Double: The approximate digit width. This is merely a representative value useful, for example, for determining the initial size for a window. Actual digits in text can be wider and narrower than this, though this value is generally somewhat more accurate than approximateCharWidth.
underlineThickness :: Double: The suggested thickness to draw an underline.
underlinePosition :: Double: The suggested position to draw the underline. The value returned is the distance above the baseline of the top of the underline. Since most fonts have underline positions beneath the baseline, this value is typically negative.
strikethroughThickness :: Double: The suggested thickness to draw for the strikethrough.
strikethroughPosition :: Double: The suggested position to draw the strikethrough. The value returned is the distance above the baseline of the top of the strikethrough.

Instances

Show FontMetrics

data Size Source

Define attributes for FontSize.

Constructors

SizePoint Double
SizeUnreadable
SizeTiny
SizeSmall
SizeMedium
SizeLarge
SizeHuge
SizeGiant
SizeSmaller
SizeLarger

Instances

Show Size

data FontStyle Source

The style of a font.

StyleOblique is a slanted font like StyleItalic, but in a roman style.

Constructors

StyleNormal
StyleOblique
StyleItalic

Instances

Enum FontStyle
Eq FontStyle
Show FontStyle

data Weight Source

Define attributes for Weight.

Constructors

WeightThin
WeightUltralight
WeightLight
WeightBook
WeightNormal
WeightMedium
WeightSemibold
WeightBold
WeightUltrabold
WeightHeavy
WeightUltraheavy

Instances

Enum Weight
Eq Weight
Show Weight

data Variant Source

The variant of a font.

The VariantSmallCaps is a version of a font where lower case letters are shown as physically smaller upper case letters.

Constructors

VariantNormal
VariantSmallCaps

Instances

Enum Variant
Eq Variant
Show Variant

data Stretch Source

Define how wide characters are.

Constructors

StretchUltraCondensed
StretchExtraCondensed
StretchCondensed
StretchSemiCondensed
StretchNormal
StretchSemiExpanded
StretchExpanded
StretchExtraExpanded
StretchUltraExpanded

Instances

Enum Stretch
Eq Stretch
Show Stretch

data Underline Source

Define attributes for Underline.

The squiggly underline for errors is only available in Gtk 2.4 and higher.

Constructors

UnderlineNone
UnderlineSingle
UnderlineDouble
UnderlineLow
UnderlineError

Instances

Enum Underline
Eq Underline
Show Underline

data PangoDirection Source

The PangoDirection type represents a direction in the Unicode bidirectional algorithm.

The "weak" values denote a left-to-right or right-to-left direction only if there is no character with a strong direction in a paragraph. An example is a sequence of special, graphical characters which are neutral with respect to their rendering direction. A fresh PangoContext is by default weakly left-to-right.
Not every value in this enumeration makes sense for every usage of PangoDirection; for example, the return value of unicharDirection and findBaseDir cannot be PangoDirectionWeakLtr or PangoDirectionWeakRtl, since every character is either neutral or has a strong direction; on the other hand PangoDirectionNeutral doesn't make sense to pass to log2visGetEmbeddingLevels.

Constructors

PangoDirectionLtr
PangoDirectionRtl
PangoDirectionWeakLtr
PangoDirectionWeakRtl
PangoDirectionNeutral

Instances

Enum PangoDirection
Eq PangoDirection
Ord PangoDirection

data PangoAttribute Source

Attributes for PangoItems.

A given attribute is applied from its start position paStart up, but not including the end position, paEnd.

Constructors

AttrLanguage	A hint as to what language this piece of text is written in.
Fields paStart :: Int paEnd :: Int paLang :: Language
AttrFamily	The font family, e.g. `sans serif`.
Fields paStart :: Int paEnd :: Int paFamily :: DefaultGlibString
AttrStyle	The slant of the current font.
Fields paStart :: Int paEnd :: Int paStyle :: FontStyle
AttrWeight	Weight of font, e.g. `WeightBold`.
Fields paStart :: Int paEnd :: Int paWeight :: Weight
AttrVariant	`VariantSmallCaps` will display lower case letters as small upper case letters (if the font supports this).
Fields paStart :: Int paEnd :: Int paVariant :: Variant
AttrStretch	Stretch or condense the width of the letters.
Fields paStart :: Int paEnd :: Int paStretch :: Stretch
AttrSize	Specify the size of the font in points.
Fields paStart :: Int paEnd :: Int paSize :: Double
AttrAbsSize	Specify the size of the font in device units (pixels). Available in Pango 1.8.0 and higher.
Fields paStart :: Int paEnd :: Int paSize :: Double
AttrFontDescription	Specify several attributes of a font at once. Note that no deep copy of the description is made when this attributes is passed to or received from functions.
Fields paStart :: Int paEnd :: Int paFontDescription :: FontDescription
AttrForeground	Specify the foreground color.
Fields paStart :: Int paEnd :: Int paColor :: Color
AttrBackground	Specify the background color.
Fields paStart :: Int paEnd :: Int paColor :: Color
AttrUnderline	Specify the kind of underline, e.g. `UnderlineSingle`.
Fields paStart :: Int paEnd :: Int paUnderline :: Underline
AttrUnderlineColor	Specify the color of an underline. Available in Pango 1.8.0 and higher.
Fields paStart :: Int paEnd :: Int paColor :: Color
AttrStrikethrough	Specify if this piece of text should have a line through it.
Fields paStart :: Int paEnd :: Int paStrikethrough :: Bool
AttrStrikethroughColor	Specify the color of the strike through line. Available in Pango 1.8.0 and higher.
Fields paStart :: Int paEnd :: Int paColor :: Color
AttrRise	Displace the text vertically. Positive values move the text upwards.
Fields paStart :: Int paEnd :: Int paRise :: Double
AttrShape	Restrict the amount of what is drawn of the marked shapes. Available in Pango 1.8.0 and higher.
Fields paStart :: Int paEnd :: Int paInk :: PangoRectangle paLogical :: PangoRectangle
AttrScale	Scale the font up (values greater than one) or shrink the font.
Fields paStart :: Int paEnd :: Int paScale :: Double
AttrFallback	Determine if a fall back font should be substituted if no matching font is available.
Fields paStart :: Int paEnd :: Int paFallback :: Bool
AttrLetterSpacing	Add extra space between graphemes of the text. Available in Pango 1.6.0 and higher.
Fields paStart :: Int paEnd :: Int paLetterSpacing :: Double
AttrGravity	Sets the gravity field of a font description. The gravity field specifies how the glyphs should be rotated. If gravity is `GravityAuto`, this actually unsets the gravity mask on the font description. This function is seldom useful to the user. Gravity should normally be set on a `PangoContext`. Available in Pango 1.16.0 and higher.
Fields paStart :: Int paEnd :: Int paGravity :: PangoGravity
AttrGravityHint	Set the way horizontal scripts behave in a vertical context. Available in Pango 1.16.0 and higher.
Fields paStart :: Int paEnd :: Int paGravityHint :: PangoGravityHint

Instances

Show PangoAttribute

data EllipsizeMode Source

The EllipsizeMode type describes what sort of (if any) ellipsization should be applied to a line of text. In the ellipsization process characters are removed from the text in order to make it fit to a given width and replaced with an ellipsis.

Constructors

EllipsizeNone
EllipsizeStart
EllipsizeMiddle
EllipsizeEnd

Instances

Enum EllipsizeMode
Eq EllipsizeMode

data PangoGravity Source

The PangoGravity type represents the orientation of glyphs in a segment of text. The value GravitySouth, for instance, indicates that the text stands upright, i.e. that the base of the letter is directed downwards.

This is useful when rendering vertical text layouts. In those situations, the layout is rotated using a non-identity PangoMatrix, and then glyph orientation is controlled using PangoGravity. Not every value in this enumeration makes sense for every usage of Gravity; for example, PangoGravityAuto only can be passed to pangoContextSetBaseGravity and can only be returned by pangoContextGetBaseGravity.

See also: PangoGravityHint
Gravity is resolved from the context matrix.
Since Pango 1.16

Constructors

PangoGravitySouth
PangoGravityEast
PangoGravityNorth
PangoGravityWest
PangoGravityAuto

Instances

Enum PangoGravity
Eq PangoGravity
Show PangoGravity

data PangoGravityHint Source

The PangoGravityHint defines how horizontal scripts should behave in a vertical context.

PangoGravityHintNatural: scripts will take their natural gravity based on the base gravity and the script. This is the default.
PangoGravityHintStrong: always use the base gravity set, regardless of the script.
PangoGravityHintLine: for scripts not in their natural direction (eg. Latin in East gravity), choose per-script gravity such that every script respects the line progression. This means, Latin and Arabic will take opposite gravities and both flow top-to-bottom for example.

Constructors

PangoGravityHintNatural
PangoGravityHintStrong
PangoGravityHintLine

Instances

Enum PangoGravityHint
Eq PangoGravityHint
Show PangoGravityHint

data Language Source

An RFC-3066 language designator to choose scripts.

Instances

Eq Language
Show Language

emptyLanguage :: Language Source

Specifying no particular language.

languageFromString :: GlibString string => string -> IO Language Source

Take a RFC-3066 format language tag as a string and convert it to a Language type that can be efficiently passed around and compared with other language tags.

This function first canonicalizes the string by converting it to lowercase, mapping '_' to '-', and stripping all characters other than letters and '-'.