Safe Haskell	None
Language	Haskell2010

Data.GI.Base.GParamSpec

Contents

Memory management
GParamSpec building
Get/Set

Description

Management of GParamSpecs.

Synopsis

wrapGParamSpecPtr :: Ptr GParamSpec -> IO GParamSpec
newGParamSpecFromPtr :: Ptr GParamSpec -> IO GParamSpec
unrefGParamSpec :: GParamSpec -> IO ()
disownGParamSpec :: GParamSpec -> IO (Ptr GParamSpec)
data PropertyInfo o a = PropertyInfo {
- name :: Text
- nick :: Text
- blurb :: Text
- setter :: o -> a -> IO ()
- getter :: o -> IO a
- flags :: Maybe [GParamFlag]
}
gParamSpecValue :: forall o a. GObject o => PropertyInfo o a -> IO GParamSpec
data CStringPropertyInfo o = CStringPropertyInfo {
- name :: Text
- nick :: Text
- blurb :: Text
- defaultValue :: Maybe Text
- flags :: Maybe [GParamFlag]
- setter :: o -> Maybe Text -> IO ()
- getter :: o -> IO (Maybe Text)
}
gParamSpecCString :: GObject o => CStringPropertyInfo o -> IO GParamSpec
data CIntPropertyInfo o = CIntPropertyInfo {
- name :: Text
- nick :: Text
- blurb :: Text
- defaultValue :: CInt
- setter :: o -> CInt -> IO ()
- getter :: o -> IO CInt
- flags :: Maybe [GParamFlag]
- minValue :: Maybe CInt
- maxValue :: Maybe CInt
}
gParamSpecCInt :: GObject o => CIntPropertyInfo o -> IO GParamSpec
data GParamFlag
- = GParamReadable
- | GParamWritable
- | GParamConstruct
- | GParamConstructOnly
- | GParamExplicitNotify
- | AnotherGParamFlag Int
data PropGetSetter o = PropGetSetter {
- propGetter :: Ptr o -> Ptr GValue -> IO ()
- propSetter :: Ptr o -> Ptr GValue -> IO ()
}
getGParamSpecGetterSetter :: forall o. Ptr GParamSpec -> IO (Maybe (PropGetSetter o))

Memory management

wrapGParamSpecPtr :: Ptr GParamSpec -> IO GParamSpec Source #

Take ownership of a ParamSpec passed in Ptr.

newGParamSpecFromPtr :: Ptr GParamSpec -> IO GParamSpec Source #

Construct a Haskell wrapper for the given GParamSpec, without assuming ownership.

unrefGParamSpec :: GParamSpec -> IO () Source #

Remove a reference to the given GParamSpec.

disownGParamSpec :: GParamSpec -> IO (Ptr GParamSpec) Source #

Disown a GParamSpec, i.e. do not longer unref the associated foreign GParamSpec when the Haskell GParamSpec gets garbage collected.

GParamSpec building

data PropertyInfo o a Source #

Information on a property encoding a Haskell value. Note that from the C side this property will appear as an opaque pointer. Use the specialized constructors below for creating properties meaningful from the C side.

A property name consists of segments consisting of ASCII letters and digits, separated by either the '-' or '_' character. The first character of a property name must be a letter. Names which violate these rules lead to undefined behaviour.

When creating and looking up a property, either separator can be used, but they cannot be mixed. Using '-' is considerably more efficient and in fact required when using property names as detail strings for signals.

Beyond the name, properties have two more descriptive strings associated with them, the nick, which should be suitable for use as a label for the property in a property editor, and the blurb, which should be a somewhat longer description, suitable for e.g. a tooltip. The nick and blurb should ideally be localized.

Constructors

PropertyInfo
Fields name :: Text Identifier for the property. nick :: Text Identifier for display to the user. blurb :: Text Description of the property. setter :: o -> a -> IO () Handler invoked when the property is being set. getter :: o -> IO a Handler that returns the current value of the property. flags :: Maybe [GParamFlag] Set of flags, or `Nothing` for the default set of flags.

gParamSpecValue :: forall o a. GObject o => PropertyInfo o a -> IO GParamSpec Source #

Create a GParamSpec for a Haskell value.

data CStringPropertyInfo o Source #

Information on a property of type Text to be registered. A property name consists of segments consisting of ASCII letters and digits, separated by either the '-' or '_' character. The first character of a property name must be a letter. Names which violate these rules lead to undefined behaviour.

When creating and looking up a property, either separator can be used, but they cannot be mixed. Using '-' is considerably more efficient and in fact required when using property names as detail strings for signals.

Beyond the name, properties have two more descriptive strings associated with them, the nick, which should be suitable for use as a label for the property in a property editor, and the blurb, which should be a somewhat longer description, suitable for e.g. a tooltip. The nick and blurb should ideally be localized.

Constructors

CStringPropertyInfo
Fields name :: Text nick :: Text blurb :: Text defaultValue :: Maybe Text flags :: Maybe [GParamFlag] setter :: o -> Maybe Text -> IO () getter :: o -> IO (Maybe Text)

gParamSpecCString :: GObject o => CStringPropertyInfo o -> IO GParamSpec Source #

Create a GParamSpec for a string param.

data CIntPropertyInfo o Source #

Information on a property of type CInt to be registered. A property name consists of segments consisting of ASCII letters and digits, separated by either the '-' or '_' character. The first character of a property name must be a letter. Names which violate these rules lead to undefined behaviour.

When creating and looking up a property, either separator can be used, but they cannot be mixed. Using '-' is considerably more efficient and in fact required when using property names as detail strings for signals.

Beyond the name, properties have two more descriptive strings associated with them, the nick, which should be suitable for use as a label for the property in a property editor, and the blurb, which should be a somewhat longer description, suitable for e.g. a tooltip. The nick and blurb should ideally be localized.

Constructors

CIntPropertyInfo

Fields

name :: Text
Identifier for the property.
nick :: Text
Identifier for display to the user.
blurb :: Text
Description of the property.
defaultValue :: CInt
Default value.
setter :: o -> CInt -> IO ()
Handler invoked when the property is being set.
getter :: o -> IO CInt
Handler that returns the current value of the property.
flags :: Maybe [GParamFlag]
Set of flags, or Nothing for the default set of flags.
minValue :: Maybe CInt
Minimum value, or Nothing, which would be replaced by MININT.
maxValue :: Maybe CInt
Maximum value, or Nothing, which would be replaced by MAXINT.

gParamSpecCInt :: GObject o => CIntPropertyInfo o -> IO GParamSpec Source #

Create a GParamSpec for an integer param.

data GParamFlag Source #

Flags controlling the behaviour of the the parameters.

Constructors

GParamReadable	the parameter is readable
GParamWritable	the parameter is writable
GParamConstruct	the parameter will be set upon object construction
GParamConstructOnly	the parameter can only be set upon object construction
GParamExplicitNotify	calls to `objectSetProperty` for this property will not automatically result in a "notify" signal being emitted: the implementation must call `objectNotify` themselves in case the property actually changes.
AnotherGParamFlag Int	Catch-all for unknown values

Instances

Instances details

Enum GParamFlag Source #
Instance details Defined in Data.GI.Base.GParamSpec Methods succ :: GParamFlag -> GParamFlag # pred :: GParamFlag -> GParamFlag # toEnum :: Int -> GParamFlag # fromEnum :: GParamFlag -> Int # enumFrom :: GParamFlag -> [GParamFlag] # enumFromThen :: GParamFlag -> GParamFlag -> [GParamFlag] # enumFromTo :: GParamFlag -> GParamFlag -> [GParamFlag] # enumFromThenTo :: GParamFlag -> GParamFlag -> GParamFlag -> [GParamFlag] #
Eq GParamFlag Source #
Instance details Defined in Data.GI.Base.GParamSpec Methods (==) :: GParamFlag -> GParamFlag -> Bool # (/=) :: GParamFlag -> GParamFlag -> Bool #
Ord GParamFlag Source #
Instance details Defined in Data.GI.Base.GParamSpec Methods compare :: GParamFlag -> GParamFlag -> Ordering # (<) :: GParamFlag -> GParamFlag -> Bool # (<=) :: GParamFlag -> GParamFlag -> Bool # (>) :: GParamFlag -> GParamFlag -> Bool # (>=) :: GParamFlag -> GParamFlag -> Bool # max :: GParamFlag -> GParamFlag -> GParamFlag # min :: GParamFlag -> GParamFlag -> GParamFlag #
Show GParamFlag Source #
Instance details Defined in Data.GI.Base.GParamSpec Methods showsPrec :: Int -> GParamFlag -> ShowS # show :: GParamFlag -> String # showList :: [GParamFlag] -> ShowS #
IsGFlag GParamFlag Source #
Instance details Defined in Data.GI.Base.GParamSpec

Get/Set

data PropGetSetter o Source #

Low-level getter and setter for the property.

Constructors

PropGetSetter
Fields propGetter :: Ptr o -> Ptr GValue -> IO () propSetter :: Ptr o -> Ptr GValue -> IO ()

getGParamSpecGetterSetter :: forall o. Ptr GParamSpec -> IO (Maybe (PropGetSetter o)) Source #

Attempt to get the Haskell setter and getter for the given GParamSpec. This will only be possible if the GParamSpec was created with one of the functions above, if this is not the case the function will return Nothing.