pango-0.11.0: Binding to the Pango text rendering engine.ContentsIndex
Graphics.Rendering.Pango.Context
Portabilityportable (depends on GHC)
Stabilityprovisional
Maintainergtk2hs-users@lists.sourceforge.net
Contents
Types and Methods for PangoContexts
Description

This module defines PangoContexts, an environment that provides information on available fonts, internationalization and output capabilities of the medium. Given such a context, text can be rendered into strings of glyphs (see Graphics.UI.Gtk.Pango.Rendering) or, at a more abstract level, using layouts (see Graphics.UI.Gtk.Pango.Layout).

  • A PangoContext is a prerequisite for all text rendering functions. A context can be created from scratch or, more conveniently, by using default settings that are already used in the application. When text is rendered through Gdk, use Graphics.UI.Gtk.Abstract.Widget.widgetCreatePangoContext, if you use the Cairo rendering engine, a new context can be acquired using Graphics.UI.Gtk.Cairo.cairoCreateContext.
  • The properties of a PangoContext can be changed which, in turn, has an effect on how text is rendered. To reflect such a change in the rendered text, call Graphics.UI.Gtk.Pango.Layout.layoutContextChanged.
Synopsis
data PangoContext
contextListFamilies :: PangoContext -> IO [FontFamily]
contextGetMetrics :: PangoContext -> FontDescription -> Language -> IO FontMetrics
contextSetFontDescription :: PangoContext -> FontDescription -> IO ()
contextGetFontDescription :: PangoContext -> IO FontDescription
data Language
emptyLanguage :: Language
languageFromString :: String -> IO Language
contextSetLanguage :: PangoContext -> Language -> IO ()
contextGetLanguage :: PangoContext -> IO Language
contextSetTextDir :: PangoContext -> PangoDirection -> IO ()
contextGetTextDir :: PangoContext -> IO PangoDirection
contextSetTextGravity :: PangoContext -> PangoGravity -> IO ()
contextGetTextGravity :: PangoContext -> IO PangoGravity
contextSetTextGravityHint :: PangoContext -> PangoGravityHint -> IO ()
contextGetTextGravityHint :: PangoContext -> IO PangoGravityHint
contextGetMatrix :: PangoContext -> IO Matrix
contextSetMatrix :: PangoContext -> Matrix -> IO ()
Types and Methods for PangoContexts
data PangoContext
show/hide Instances
contextListFamilies :: PangoContext -> IO [FontFamily]

Retrieve a list of all available font families.

  • A font family is the name of the font without further attributes like slant, variant or size.
contextGetMetrics :: PangoContext -> FontDescription -> Language -> IO FontMetrics
Query the metrics of the given font implied by the font description.
contextSetFontDescription :: PangoContext -> FontDescription -> IO ()
Set the default FontDescription of this context.
contextGetFontDescription :: PangoContext -> IO FontDescription
Get the current FontDescription of this context.
data Language
An RFC-3066 language designator to choose scripts.
show/hide Instances
emptyLanguage :: Language
Specifying no particular language.
languageFromString :: String -> IO Language

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 '-'.
contextSetLanguage :: PangoContext -> Language -> IO ()
Set the default Language of this context.
contextGetLanguage :: PangoContext -> IO Language
Get the current Language of this context.
contextSetTextDir :: PangoContext -> PangoDirection -> IO ()
Set the default text direction of this context.
contextGetTextDir :: PangoContext -> IO PangoDirection
Get the current text direction of this context.
contextSetTextGravity :: PangoContext -> PangoGravity -> IO ()
Set the text gravity of this context. If the given value is PangoGravityAuto then the gravity is derived from the current rotation matrix.
contextGetTextGravity :: PangoContext -> IO PangoGravity
Get the current text gravity of this context.
contextSetTextGravityHint :: PangoContext -> PangoGravityHint -> IO ()
Set the text gravity hint of this context.
contextGetTextGravityHint :: PangoContext -> IO PangoGravityHint
Get the current text gravity of this context.
contextGetMatrix :: PangoContext -> IO Matrix

Gets the transformation matrix that will be applied when rendering with this context.

  • Since Pango 1.6
contextSetMatrix :: PangoContext -> Matrix -> IO ()

Sets the transformation matrix that will be applied when rendering with this context. Note that any metrics reported by other functions are in user space coordinates before the application of the matrix, not device-space coordinates after the application of the matrix. So, they don't scale with the matrix, though they may change slightly for different matrices, depending on how the text is fit to the pixel grid.

  • Since Pango 1.6
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