PgContext

The gstreamer.Context structure stores global information used to control the itemization process.

class PgContext : ObjectG {}

Constructors

this
this(PangoContext* pangoContext, bool ownedRef)

Sets our main struct and passes it to the parent class.

this
this()

Creates a new gstreamer.Context initialized to default values.

Members

Functions

changed
void changed()

Forces a change in the context, which will cause any gtk.Layout using this context to re-layout.

getBaseDir
PangoDirection getBaseDir()

Retrieves the base direction for the context. See Context.setBaseDir.

getBaseGravity
PangoGravity getBaseGravity()

Retrieves the base gravity for the context. See Context.setBaseGravity.

getFontDescription
PgFontDescription getFontDescription()

Retrieve the default font description for the context.

getFontMap
PgFontMap getFontMap()

Gets the PangoFontMap used to look up fonts for this context.

getGravity
PangoGravity getGravity()

Retrieves the gravity for the context. This is similar to Context.getBaseGravity, except for when the base gravity is PANGO_GRAVITY_AUTO for which pango_gravity_get_for_matrix() is used to return the gravity from the current context matrix.

getGravityHint
PangoGravityHint getGravityHint()

Retrieves the gravity hint for the context. See Context.setGravityHint for details.

getLanguage
PgLanguage getLanguage()

Retrieves the global language tag for the context.

getMatrix
PgMatrix getMatrix()

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

getMetrics
PgFontMetrics getMetrics(PgFontDescription desc, PgLanguage language)

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.

getPgContextStruct
PangoContext* getPgContextStruct(bool transferOwnership)

Get the main Gtk struct

getSerial
uint getSerial()

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 PangoFontMap 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".

getStruct
void* getStruct()

the main Gtk struct as a void*

listFamilies
void listFamilies(PgFontFamily[] families)

List all families for a context.

loadFont
PgFont loadFont(PgFontDescription desc)

Loads the font in one of the fontmaps in the context that is the closest match for desc.

loadFontset
PgFontset loadFontset(PgFontDescription desc, PgLanguage language)

Load a set of fonts in the context that can be used to render a font matching desc.

setBaseDir
void setBaseDir(PangoDirection direction)

Sets the base direction for the context.

setBaseGravity
void setBaseGravity(PangoGravity gravity)

Sets the base gravity for the context.

setFontDescription
void setFontDescription(PgFontDescription desc)

Set the default font description for the context

setFontMap
void setFontMap(PgFontMap fontMap)

Sets the font map to be searched when fonts are looked-up in this context. This is only for internal use by Pango backends, a gstreamer.Context obtained via one of the recommended methods should already have a suitable font map.

setGravityHint
void setGravityHint(PangoGravityHint hint)

Sets the gravity hint for the context.

setLanguage
void setLanguage(PgLanguage 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().

setMatrix
void setMatrix(PgMatrix 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.

Static functions

bidiTypeForUnichar
PangoBidiType bidiTypeForUnichar(dchar ch)

Determines the normative bidirectional character type of a character, as specified in the Unicode Character Database.

defaultBreak
void defaultBreak(string text, int length, PangoAnalysis* analysis, PangoLogAttr* attrs, int attrsLen)

This is the default break algorithm, used if no language engine overrides it. Normally you should use pango_break() instead. Unlike pango_break(), analysis can be NULL, but only do that if you know what you're doing. If you need an analysis to pass to pango_break(), you need to pango_itemize(). In most cases however you should simply use pango_get_log_attrs().

findBaseDir
PangoDirection findBaseDir(string text, int length)

Searches a string the first character that has a strong direction, according to the Unicode bidirectional algorithm.

findParagraphBoundary
void findParagraphBoundary(string text, int length, int paragraphDelimiterIndex, int nextParagraphStart)

Locates a paragraph boundary in text. A boundary is caused by delimiter characters, such as a newline, carriage return, carriage return-newline pair, or Unicode paragraph separator character. The index of the run of delimiters is returned in paragraph_delimiter_index. The index of the start of the paragraph (index after all delimiters) is stored in next_paragraph_start.

getLogAttrs
void getLogAttrs(string text, int length, int level, PgLanguage language, PangoLogAttr[] logAttrs)

Computes a PangoLogAttr for each character in text. The log_attrs array must have one PangoLogAttr for each position in text; if text contains N characters, it has N+1 positions, including the last position at the end of the text. text should be an entire paragraph; logical attributes can't be computed without context (for example you need to see spaces on either side of a word to know the word is a word).

getMirrorChar
bool getMirrorChar(dchar ch, dchar* mirroredCh)

If ch has the Unicode mirrored property and there is another Unicode character that typically has a glyph that is the mirror image of ch's glyph, puts that character in the address pointed to by mirrored_ch.

getType
GType getType()
itemize
ListG itemize(PgContext context, string text, int startIndex, int length, PgAttributeList attrs, PgAttributeIterator cachedIter)

Breaks a piece of text into segments with consistent directional level and shaping engine. Each byte of text will be contained in exactly one of the items in the returned list; the generated list of items will be in logical order (the start offsets of the items are ascending).

itemizeWithBaseDir
ListG itemizeWithBaseDir(PgContext context, PangoDirection baseDir, string text, int startIndex, int length, PgAttributeList attrs, PgAttributeIterator cachedIter)

Like pango_itemize(), but the base direction to use when computing bidirectional levels (see pango_context_set_base_dir ()), is specified explicitly rather than gotten from the gstreamer.Context

pangoBreak
void pangoBreak(string text, int length, PangoAnalysis* analysis, PangoLogAttr[] attrs)

Determines possible line, word, and character breaks for a string of Unicode text with a single analysis. For most purposes you may want to use pango_get_log_attrs().

reorderItems
ListG reorderItems(ListG logicalItems)

From a list of items in logical order and the associated directional levels, produce a list in visual order. The original list is unmodified.

shape
void shape(string text, int length, PangoAnalysis* analysis, PgGlyphString glyphs)

Given a segment of text and the corresponding PangoAnalysis structure returned from pango_itemize(), convert the characters into glyphs. You may also pass in only a substring of the item from pango_itemize().

shapeFull
void shapeFull(string itemText, int itemLength, string paragraphText, int paragraphLength, PangoAnalysis* analysis, PgGlyphString glyphs)

Given a segment of text and the corresponding PangoAnalysis structure returned from pango_itemize(), convert the characters into glyphs. You may also pass in only a substring of the item from pango_itemize().

unicharDirection
PangoDirection unicharDirection(dchar ch)

Determines the inherent direction of a character; either PANGO_DIRECTION_LTR, PANGO_DIRECTION_RTL, or PANGO_DIRECTION_NEUTRAL.

Variables

pangoContext
PangoContext* pangoContext;

the main Gtk struct

Inherited Members

From ObjectG

gObject
GObject* gObject;

the main Gtk struct

getObjectGStruct
GObject* getObjectGStruct(bool transferOwnership)

Get the main Gtk struct

getStruct
void* getStruct()

the main Gtk struct as a void*

opCast
T opCast()
getDObject
RT getDObject(U obj, bool ownedRef)

Gets a D Object from the objects table of associations.

setProperty
void setProperty(string propertyName, T value)
addOnNotify
gulong addOnNotify(void delegate(ParamSpec, ObjectG) dlg, string property, ConnectFlags connectFlags)

The notify signal is emitted on an object when one of its properties has been changed. Note that getting this signal doesn't guarantee that the value of the property has actually changed, it may also be emitted when the setter for the property is called to reinstate the previous value.

getType
GType getType()
compatControl
size_t compatControl(size_t what, void* data)
interfaceFindProperty
ParamSpec interfaceFindProperty(TypeInterface gIface, string propertyName)

Find the gobject.ParamSpec with the given name for an interface. Generally, the interface vtable passed in as g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().

interfaceInstallProperty
void interfaceInstallProperty(TypeInterface gIface, ParamSpec pspec)

Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created gobject.ParamSpec, but normally ObjectClass.overrideProperty will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.

interfaceListProperties
ParamSpec[] interfaceListProperties(TypeInterface gIface)

Lists the properties of an interface.Generally, the interface vtable passed in as g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek().

addToggleRef
void addToggleRef(GToggleNotify notify, void* data)

Increases the reference count of the object by one and sets a callback to be called when all other references to the object are dropped, or when this is already the last reference to the object and another reference is established.

addWeakPointer
void addWeakPointer(void* weakPointerLocation)

Adds a weak reference from weak_pointer to object to indicate that the pointer located at weak_pointer_location is only valid during the lifetime of object. When the object is finalized, weak_pointer will be set to NULL.

bindProperty
Binding bindProperty(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags)

Creates a binding between source_property on source and target_property on target. Whenever the source_property is changed the target_property is updated using the same value. For instance:

bindPropertyFull
Binding bindPropertyFull(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, GBindingTransformFunc transformTo, GBindingTransformFunc transformFrom, void* userData, GDestroyNotify notify)

Complete version of g_object_bind_property().

bindPropertyWithClosures
Binding bindPropertyWithClosures(string sourceProperty, ObjectG target, string targetProperty, GBindingFlags flags, Closure transformTo, Closure transformFrom)

Creates a binding between source_property on source and target_property on target, allowing you to set the transformation functions to be used by the binding.

dupData
void* dupData(string key, GDuplicateFunc dupFunc, void* userData)

This is a variant of g_object_get_data() which returns a 'duplicate' of the value. dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.

dupQdata
void* dupQdata(GQuark quark, GDuplicateFunc dupFunc, void* userData)

This is a variant of g_object_get_qdata() which returns a 'duplicate' of the value. dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.

forceFloating
void forceFloating()

This function is intended for GObject implementations to re-enforce a floating[floating-ref] object reference. Doing this is seldom required: all GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().

freezeNotify
void freezeNotify()

Increases the freeze count on object. If the freeze count is non-zero, the emission of "notify" signals on object is stopped. The signals are queued until the freeze count is decreased to zero. Duplicate notifications are squashed so that at most one notify signal is emitted for each property modified while the object is frozen.

getData
void* getData(string key)

Gets a named field from the objects table of associations (see g_object_set_data()).

getProperty
void getProperty(string propertyName, Value value)

Gets a property of an object.

getQdata
void* getQdata(GQuark quark)

This function gets back user data pointers stored via g_object_set_qdata().

getValist
void getValist(string firstPropertyName, void* varArgs)

Gets properties of an object.

getv
void getv(string[] names, Value[] values)

Gets n_properties properties for an object. Obtained properties will be set to values. All properties must be valid. Warnings will be emitted and undefined behaviour may result if invalid properties are passed in.

isFloating
bool isFloating()

Checks whether object has a floating[floating-ref] reference.

notify
void notify(string propertyName)

Emits a "notify" signal for the property property_name on object.

notifyByPspec
void notifyByPspec(ParamSpec pspec)

Emits a "notify" signal for the property specified by pspec on object.

ref_
ObjectG ref_()

Increases the reference count of object.

refSink
ObjectG refSink()

Increase the reference count of object, and possibly remove the floating[floating-ref] reference, if object has a floating reference.

removeToggleRef
void removeToggleRef(GToggleNotify notify, void* data)

Removes a reference added with g_object_add_toggle_ref(). The reference count of the object is decreased by one.

removeWeakPointer
void removeWeakPointer(void* weakPointerLocation)

Removes a weak reference from object that was previously added using g_object_add_weak_pointer(). The weak_pointer_location has to match the one used with g_object_add_weak_pointer().

replaceData
bool replaceData(string key, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify oldDestroy)

Compares the user data for the key key on object with oldval, and if they are the same, replaces oldval with newval.

replaceQdata
bool replaceQdata(GQuark quark, void* oldval, void* newval, GDestroyNotify destroy, GDestroyNotify oldDestroy)

Compares the user data for the key quark on object with oldval, and if they are the same, replaces oldval with newval.

runDispose
void runDispose()

Releases all references to other objects. This can be used to break reference cycles.

setData
void setData(string key, void* data)

Each object carries around a table of associations from strings to pointers. This function lets you set an association.

setDataFull
void setDataFull(string key, void* data, GDestroyNotify destroy)

Like g_object_set_data() except it adds notification for when the association is destroyed, either by setting it to a different value or when the object is destroyed.

setProperty
void setProperty(string propertyName, Value value)

Sets a property on an object.

setQdata
void setQdata(GQuark quark, void* data)

This sets an opaque, named pointer on an object. The name is specified through a GQuark (retrived e.g. via g_quark_from_static_string()), and the pointer can be gotten back from the object with g_object_get_qdata() until the object is finalized. Setting a previously set user data pointer, overrides (frees) the old pointer set, using NULL as pointer essentially removes the data stored.

setQdataFull
void setQdataFull(GQuark quark, void* data, GDestroyNotify destroy)

This function works like g_object_set_qdata(), but in addition, a void (*destroy) (gpointer) function may be specified which is called with data as argument when the object is finalized, or the data is being overwritten by a call to g_object_set_qdata() with the same quark.

setValist
void setValist(string firstPropertyName, void* varArgs)

Sets properties on an object.

setv
void setv(string[] names, Value[] values)

Sets n_properties properties for an object. Properties to be set will be taken from values. All properties must be valid. Warnings will be emitted and undefined behaviour may result if invalid properties are passed in.

stealData
void* stealData(string key)

Remove a specified datum from the object's data associations, without invoking the association's destroy handler.

stealQdata
void* stealQdata(GQuark quark)

This function gets back user data pointers stored via g_object_set_qdata() and removes the data from object without invoking its destroy() function (if any was set). Usually, calling this function is only required to update user data pointers with a destroy notifier, for example:

thawNotify
void thawNotify()

Reverts the effect of a previous call to g_object_freeze_notify(). The freeze count is decreased on object and when it reaches zero, queued "notify" signals are emitted.

unref
void unref()

Decreases the reference count of object. When its reference count drops to 0, the object is finalized (i.e. its memory is freed).

watchClosure
void watchClosure(Closure closure)

This function essentially limits the life time of the closure to the life time of the object. That is, when the object is finalized, the closure is invalidated by calling Closure.invalidate on it, in order to prevent invocations of the closure with a finalized (nonexisting) object. Also, g_object_ref() and g_object_unref() are added as marshal guards to the closure, to ensure that an extra reference count is held on object during invocation of the closure. Usually, this function will be called on closures that use this object as closure data.

weakRef
void weakRef(GWeakNotify notify, void* data)

Adds a weak reference callback to an object. Weak references are used for notification when an object is finalized. They are called "weak references" because they allow you to safely hold a pointer to an object without calling g_object_ref() (g_object_ref() adds a strong reference, that is, forces the object to stay alive).

weakUnref
void weakUnref(GWeakNotify notify, void* data)

Removes a weak reference callback to an object.

clearObject
void clearObject(ObjectG objectPtr)

Clears a reference to a GObject