The Pango.Context.Pango_Context structure stores global information used to control the itemization process.
procedure Changed (Self : not null access Pango_Context_Record)
Forces a change in the context, which will cause any Pango.Layout.Pango_Layout using this context to re-layout. This function is only useful when implementing a new backend for Pango, something applications won't do. Backends should call this function if they have attached extra data to the context and such data is changed. Since: gtk+ 1.32.4
procedure Gdk_New (Self : out Pango_Context)
Creates a new Pango.Context.Pango_Context initialized to default values. This function is not particularly useful as it should always be followed by a pango_context_set_font_map call, and the function Pango.Font_Map.Create_Context does these two steps together and hence users are recommended to use that. If you are using Pango as part of a higher-level system, that system may have it's own way of create a Pango.Context.Pango_Context. For instance, the GTK+ toolkit has, among others, gdk_pango_context_get_for_screen, and Gtk.Widget.Get_Pango_Context. Use those instead.
function Get_Base_Dir
(Self : not null access Pango_Context_Record)
return Pango.Enums.Direction
Retrieves the base direction for the context. See Pango.Context.Set_Base_Dir.
the base direction for the context.
function Get_Base_Gravity
(Self : not null access Pango_Context_Record)
return Pango.Enums.Gravity
Retrieves the base gravity for the context. See Pango.Context.Set_Base_Gravity. Since: gtk+ 1.16
the base gravity for the context.
function Get_Font_Description
(Self : not null access Pango_Context_Record)
return Pango.Font.Pango_Font_Description
Retrieve the default font description for the context.
a pointer to the context's default font description. This value must not be modified or freed.
function Get_Gravity
(Self : not null access Pango_Context_Record)
return Pango.Enums.Gravity
Retrieves the gravity for the context. This is similar to Pango.Context.Get_Base_Gravity, except for when the base gravity is Pango.Enums.Pango_Gravity_Auto for which pango_gravity_get_for_matrix is used to return the gravity from the current context matrix. Since: gtk+ 1.16
the resolved gravity for the context.
function Get_Gravity_Hint
(Self : not null access Pango_Context_Record)
return Pango.Enums.GravityHint
Retrieves the gravity hint for the context. See Pango.Context.Set_Gravity_Hint for details. Since: gtk+ 1.16
the gravity hint for the context.
function Get_Language
(Self : not null access Pango_Context_Record)
return Pango.Language.Pango_Language
Retrieves the global language tag for the context.
the global language tag.
function Get_Matrix
(Self : not null access Pango_Context_Record)
return Pango.Matrix.Pango_Matrix
Gets the transformation matrix that will be applied when rendering with this context. See Pango.Context.Set_Matrix. Since: gtk+ 1.6
the matrix, or null if no matrix has been set (which is the same as the identity matrix). The returned matrix is owned by Pango and must not be modified or freed.
function Get_Metrics
(Self : not null access Pango_Context_Record;
Desc : Pango.Font.Pango_Font_Description;
Language : Pango.Language.Pango_Language)
return Pango.Font_Metrics.Pango_Font_Metrics
Get overall metric information for a particular font description. Since the metrics may be substantially different for different scripts, a language tag can be provided to indicate that the metrics should be retrieved that correspond to the script(s) used by that language. The Pango.Font.Pango_Font_Description is interpreted in the same way as by pango_itemize, and the family name may be a comma separated list of figures. If characters from multiple of these families would be used to render the string, then the returned fonts would be a composite of the metrics for the fonts loaded for the individual families.
a Pango.Font.Pango_Font_Description structure. null means that the font description from the context will be used.
language tag used to determine which script to get the metrics for. null means that the language tag from the context will be used. If no language tag is set on the context, metrics for the default language (as determined by Pango.Language.Get_Default) will be returned.
a Pango.Font_Metrics.Pango_Font_Metrics object. The caller must call Pango.Font_Metrics.Unref when finished using the object.
function Get_Round_Glyph_Positions
(Self : not null access Pango_Context_Record) return Boolean
Returns whether font rendering with this context should round glyph positions and widths. Since: gtk+ 1.44
function Get_Serial
(Self : not null access Pango_Context_Record) return Guint
Returns the current serial number of Context. The serial number is initialized to an small number larger than zero when a new context is created and is increased whenever the context is changed using any of the setter functions, or the Pango.Font_Map.Pango_Font_Map it uses to find fonts has changed. The serial may wrap, but will never have the value 0. Since it can wrap, never compare it with "less than", always use "not equals". This can be used to automatically detect changes to a Pango.Context.Pango_Context, and is only useful when implementing objects that need update when their Pango.Context.Pango_Context changes, like Pango.Layout.Pango_Layout. Since: gtk+ 1.32.4
The current serial number of Context.
function Get_Type return Glib.GType
procedure Initialize (Self : not null access Pango_Context_Record'Class)
Creates a new Pango.Context.Pango_Context initialized to default values. This function is not particularly useful as it should always be followed by a pango_context_set_font_map call, and the function Pango.Font_Map.Create_Context does these two steps together and hence users are recommended to use that. If you are using Pango as part of a higher-level system, that system may have it's own way of create a Pango.Context.Pango_Context. For instance, the GTK+ toolkit has, among others, gdk_pango_context_get_for_screen, and Gtk.Widget.Get_Pango_Context. Use those instead. Initialize does nothing if the object was already created with another call to Initialize* or G_New.
function List_Families
(Self : not null access Pango_Context_Record)
return Pango_Font_Family_Array
List all families for a context.
function Load_Font
(Self : not null access Pango_Context_Record;
Desc : Pango.Font.Pango_Font_Description)
return Pango.Font.Pango_Font
Loads the font in one of the fontmaps in the context that is the closest match for Desc.
a Pango.Font.Pango_Font_Description describing the font to load
the newly allocated Pango.Font.Pango_Font that was loaded, or null if no font matched.
function Load_Fontset
(Self : not null access Pango_Context_Record;
Desc : Pango.Font.Pango_Font_Description;
Language : Pango.Language.Pango_Language)
return Pango.Fontset.Pango_Fontset
Load a set of fonts in the context that can be used to render a font matching Desc.
a Pango.Font.Pango_Font_Description describing the fonts to load
a Pango.Language.Pango_Language the fonts will be used for
the newly allocated Pango.Fontset.Pango_Fontset loaded, or null if no font matched.
type Pango_Context is access all Pango_Context_Record'Class;
function Pango_Context_New return Pango_Context
Creates a new Pango.Context.Pango_Context initialized to default values. This function is not particularly useful as it should always be followed by a pango_context_set_font_map call, and the function Pango.Font_Map.Create_Context does these two steps together and hence users are recommended to use that. If you are using Pango as part of a higher-level system, that system may have it's own way of create a Pango.Context.Pango_Context. For instance, the GTK+ toolkit has, among others, gdk_pango_context_get_for_screen, and Gtk.Widget.Get_Pango_Context. Use those instead.
type Pango_Context_Record is new GObject_Record with null record;
procedure Set_Base_Dir
(Self : not null access Pango_Context_Record;
Direction : Pango.Enums.Direction)
Sets the base direction for the context. The base direction is used in applying the Unicode bidirectional algorithm; if the Direction is Pango.Enums.Pango_Direction_Ltr or Pango.Enums.Pango_Direction_Rtl, then the value will be used as the paragraph direction in the Unicode bidirectional algorithm. A value of Pango.Enums.Pango_Direction_Weak_Ltr or Pango.Enums.Pango_Direction_Weak_Rtl is used only for paragraphs that do not contain any strong characters themselves.
the new base direction
procedure Set_Base_Gravity
(Self : not null access Pango_Context_Record;
Gravity : Pango.Enums.Gravity)
Sets the base gravity for the context. The base gravity is used in laying vertical text out. Since: gtk+ 1.16
the new base gravity
procedure Set_Font_Description
(Self : not null access Pango_Context_Record;
Desc : Pango.Font.Pango_Font_Description)
Set the default font description for the context
the new pango font description
procedure Set_Gravity_Hint
(Self : not null access Pango_Context_Record;
Hint : Pango.Enums.GravityHint)
Sets the gravity hint for the context. The gravity hint is used in laying vertical text out, and is only relevant if gravity of the context as returned by Pango.Context.Get_Gravity is set Pango.Enums.Pango_Gravity_East or Pango.Enums.Pango_Gravity_West. Since: gtk+ 1.16
the new gravity hint
procedure Set_Language
(Self : not null access Pango_Context_Record;
Language : Pango.Language.Pango_Language)
Sets the global language tag for the context. The default language for the locale of the running process can be found using Pango.Language.Get_Default.
the new language tag.
procedure Set_Matrix
(Self : not null access Pango_Context_Record;
Matrix : Pango.Matrix.Pango_Matrix)
Sets the transformation matrix that will be applied when rendering with this context. Note that reported metrics are in the 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: gtk+ 1.6
a Pango.Matrix.Pango_Matrix, or null to unset any existing matrix. (No matrix set is the same as setting the identity matrix.)
procedure Set_Round_Glyph_Positions
(Self : not null access Pango_Context_Record;
Round_Positions : Boolean)
Sets whether font rendering with this context should round glyph positions and widths to integral positions, in device units. This is useful when the renderer can't handle subpixel positioning of glyphs. The default value is to round glyph positions, to remain compatible with previous Pango behavior. Since: gtk+ 1.44
whether to round glyph positions