GI.Pango.Structs.Item

The PangoItem structure stores information about a segment of text.

You typically obtain PangoItems by itemizing a piece of text with [funcitemize].

Exported types

newtype Item

Memory-managed wrapper type.

Constructors

Item (ManagedPtr Item)

Instances

Eq Item

Defined in GI.Pango.Structs.Item

Methods

(==) :: Item -> Item -> Bool

(/=) :: Item -> Item -> Bool

GBoxed Item

Defined in GI.Pango.Structs.Item

ManagedPtrNewtype Item

Defined in GI.Pango.Structs.Item

Methods

toManagedPtr :: Item -> ManagedPtr Item

TypedObject Item

Defined in GI.Pango.Structs.Item

Methods

glibType :: IO GType

HasParentTypes Item

Defined in GI.Pango.Structs.Item

tag ~ 'AttrSet => Constructible Item tag

Defined in GI.Pango.Structs.Item

Methods

new :: MonadIO m => (ManagedPtr Item -> Item) -> [AttrOp Item tag] -> m Item

IsGValue (Maybe Item)

Convert Item to and from GValue. See toGValue and fromGValue.

Defined in GI.Pango.Structs.Item

Methods

gvalueGType_ :: IO GType

gvalueSet_ :: Ptr GValue -> Maybe Item -> IO ()

gvalueGet_ :: Ptr GValue -> IO (Maybe Item)

type ParentTypes Item

Defined in GI.Pango.Structs.Item

type ParentTypes Item = '[] :: [Type]

newZeroItem :: MonadIO m => m Item

Construct a Item struct initialized to zero.

Methods

Click to display all available methods, including inherited ones

Methods

applyAttrs, copy, free, split.

Getters

None.

Setters

None.

applyAttrs

itemApplyAttrs

Arguments

:: (HasCallStack, MonadIO m)

=> Item

item: a PangoItem

-> AttrIterator

iter: a PangoAttrIterator

-> m ()

Add attributes to a PangoItem.

The idea is that you have attributes that don't affect itemization, such as font features, so you filter them out using attrListFilter, itemize your text, then reapply the attributes to the resulting items using this function.

The iter should be positioned before the range of the item, and will be advanced past it. This function is meant to be called in a loop over the items resulting from itemization, while passing the iter to each call.

Since: 1.44

copy

itemCopy

Arguments

:: (HasCallStack, MonadIO m)

=> Item

item: a PangoItem

-> m (Maybe Item)

Returns: the newly allocated PangoItem

Copy an existing PangoItem structure.

free

itemFree

Arguments

:: (HasCallStack, MonadIO m)

=> Item

item: a PangoItem, may be Nothing

-> m ()

Free a PangoItem and all associated memory.

new

itemNew

Arguments

:: (HasCallStack, MonadIO m)

=> m Item

Returns: the newly allocated PangoItem, which should be freed with itemFree.

Creates a new PangoItem structure initialized to default values.

split

itemSplit

Arguments

:: (HasCallStack, MonadIO m)

=> Item

orig: a PangoItem

-> Int32

splitIndex: byte index of position to split item, relative to the start of the item

-> Int32

splitOffset: number of chars between start of orig and splitIndex

-> m Item

Returns: new item representing text before splitIndex, which should be freed with itemFree.

Modifies orig to cover only the text after splitIndex, and returns a new item that covers the text before splitIndex that used to be in orig.

You can think of splitIndex as the length of the returned item. splitIndex may not be 0, and it may not be greater than or equal to the length of orig (that is, there must be at least one byte assigned to each item, you can't create a zero-length item). splitOffset is the length of the first item in chars, and must be provided because the text used to generate the item isn't available, so pango_item_split() can't count the char length of the split items itself.

Properties

analysis

analysis results for the item.

getItemAnalysis :: MonadIO m => Item -> m Analysis

Get the value of the “analysis” field. When overloading is enabled, this is equivalent to

get item #analysis

length

length of this item in bytes.

getItemLength :: MonadIO m => Item -> m Int32

Get the value of the “length” field. When overloading is enabled, this is equivalent to

get item #length

setItemLength :: MonadIO m => Item -> Int32 -> m ()

Set the value of the “length” field. When overloading is enabled, this is equivalent to

set item [ #length := value ]

numChars

number of Unicode characters in the item.

getItemNumChars :: MonadIO m => Item -> m Int32

Get the value of the “num_chars” field. When overloading is enabled, this is equivalent to

get item #numChars

setItemNumChars :: MonadIO m => Item -> Int32 -> m ()

Set the value of the “num_chars” field. When overloading is enabled, this is equivalent to

set item [ #numChars := value ]

offset

byte offset of the start of this item in text.

getItemOffset :: MonadIO m => Item -> m Int32

Get the value of the “offset” field. When overloading is enabled, this is equivalent to

get item #offset

setItemOffset :: MonadIO m => Item -> Int32 -> m ()

Set the value of the “offset” field. When overloading is enabled, this is equivalent to

set item [ #offset := value ]