Copyright | Will Thompson Iñaki García Etxebarria and Jonas Platte |
---|---|
License | LGPL-2.1 |
Maintainer | Iñaki García Etxebarria (inaki@blueleaf.cc) |
Safe Haskell | None |
Language | Haskell2010 |
Bin
is an element that can contain other Element
, allowing them to be
managed as a group.
Pads from the child elements can be ghosted to the bin, see GhostPad
.
This makes the bin look like any other elements and enables creation of
higher-level abstraction elements.
A new Bin
is created with binNew
. Use a Pipeline
instead if you
want to create a toplevel bin because a normal bin doesn't have a bus or
handle clock distribution of its own.
After the bin has been created you will typically add elements to it with
binAdd
. You can remove elements with binRemove
.
An element can be retrieved from a bin with binGetByName
, using the
elements name. binGetByNameRecurseUp
is mainly used for internal
purposes and will query the parent bins when the element is not found in the
current bin.
An iterator of elements in a bin can be retrieved with
binIterateElements
. Various other iterators exist to retrieve the
elements in a bin.
objectUnref
is used to drop your reference to the bin.
The Bin
::element-added
signal is fired whenever a new element is added to
the bin. Likewise the Bin
::element-removed
signal is fired whenever an
element is removed from the bin.
Notes
A Bin
internally intercepts every Message
posted by its children and
implements the following default behaviour for each of them:
- GST_MESSAGE_EOS: This message is only posted by sinks in the PLAYING state. If all sinks posted the EOS message, this bin will post and EOS message upwards.
- GST_MESSAGE_SEGMENT_START: Just collected and never forwarded upwards. The messages are used to decide when all elements have completed playback of their segment.
- GST_MESSAGE_SEGMENT_DONE: Is posted by
Bin
when all elements that posted a SEGMENT_START have posted a SEGMENT_DONE. - GST_MESSAGE_DURATION_CHANGED: Is posted by an element that detected a change in the stream duration. The default bin behaviour is to clear any cached duration values so that the next duration query will perform a full duration recalculation. The duration change is posted to the application so that it can refetch the new duration with a duration query. Note that these messages can be posted before the bin is prerolled, in which case the duration query might fail.
- GST_MESSAGE_CLOCK_LOST: This message is posted by an element when it can no longer provide a clock. The default bin behaviour is to check if the lost clock was the one provided by the bin. If so and the bin is currently in the PLAYING state, the message is forwarded to the bin parent. This message is also generated when a clock provider is removed from the bin. If this message is received by the application, it should PAUSE the pipeline and set it back to PLAYING to force a new clock distribution.
- GST_MESSAGE_CLOCK_PROVIDE: This message is generated when an element can provide a clock. This mostly happens when a new clock provider is added to the bin. The default behaviour of the bin is to mark the currently selected clock as dirty, which will perform a clock recalculation the next time the bin is asked to provide a clock. This message is never sent tot the application but is forwarded to the parent of the bin.
- OTHERS: posted upwards.
A Bin
implements the following default behaviour for answering to a
Query
:
- GST_QUERY_DURATION:If the query has been asked before with the same format and the bin is a toplevel bin (ie. has no parent), use the cached previous value. If no previous value was cached, the query is sent to all sink elements in the bin and the MAXIMUM of all values is returned. If the bin is a toplevel bin the value is cached. If no sinks are available in the bin, the query fails.
- GST_QUERY_POSITION:The query is sent to all sink elements in the bin and the MAXIMUM of all values is returned. If no sinks are available in the bin, the query fails.
- OTHERS:the query is forwarded to all sink elements, the result of the first sink that answers the query successfully is returned. If no sink is in the bin, the query fails.
A Bin
will by default forward any event sent to it to all sink
(GST_EVENT_TYPE_DOWNSTREAM
) or source (GST_EVENT_TYPE_UPSTREAM
) elements
depending on the event type.
If all the elements return True
, the bin will also return True
, else False
is returned. If no elements of the required type are in the bin, the event
handler will return True
.
Synopsis
- newtype Bin = Bin (ManagedPtr Bin)
- class (GObject o, IsDescendantOf Bin o) => IsBin o
- toBin :: (MonadIO m, IsBin o) => o -> m Bin
- noBin :: Maybe Bin
- binAdd :: (HasCallStack, MonadIO m, IsBin a, IsElement b) => a -> b -> m Bool
- binFindUnlinkedPad :: (HasCallStack, MonadIO m, IsBin a) => a -> PadDirection -> m (Maybe Pad)
- binGetByInterface :: (HasCallStack, MonadIO m, IsBin a) => a -> GType -> m (Maybe Element)
- binGetByName :: (HasCallStack, MonadIO m, IsBin a) => a -> Text -> m (Maybe Element)
- binGetByNameRecurseUp :: (HasCallStack, MonadIO m, IsBin a) => a -> Text -> m (Maybe Element)
- binGetSuppressedFlags :: (HasCallStack, MonadIO m, IsBin a) => a -> m [ElementFlags]
- binIterateAllByInterface :: (HasCallStack, MonadIO m, IsBin a) => a -> GType -> m (Maybe Iterator)
- binIterateElements :: (HasCallStack, MonadIO m, IsBin a) => a -> m (Maybe Iterator)
- binIterateRecurse :: (HasCallStack, MonadIO m, IsBin a) => a -> m (Maybe Iterator)
- binIterateSinks :: (HasCallStack, MonadIO m, IsBin a) => a -> m (Maybe Iterator)
- binIterateSorted :: (HasCallStack, MonadIO m, IsBin a) => a -> m (Maybe Iterator)
- binIterateSources :: (HasCallStack, MonadIO m, IsBin a) => a -> m (Maybe Iterator)
- binNew :: (HasCallStack, MonadIO m) => Maybe Text -> m Bin
- binRecalculateLatency :: (HasCallStack, MonadIO m, IsBin a) => a -> m Bool
- binRemove :: (HasCallStack, MonadIO m, IsBin a, IsElement b) => a -> b -> m Bool
- binSetSuppressedFlags :: (HasCallStack, MonadIO m, IsBin a) => a -> [ElementFlags] -> m ()
- binSyncChildrenStates :: (HasCallStack, MonadIO m, IsBin a) => a -> m Bool
- constructBinAsyncHandling :: IsBin o => Bool -> IO (GValueConstruct o)
- getBinAsyncHandling :: (MonadIO m, IsBin o) => o -> m Bool
- setBinAsyncHandling :: (MonadIO m, IsBin o) => o -> Bool -> m ()
- constructBinMessageForward :: IsBin o => Bool -> IO (GValueConstruct o)
- getBinMessageForward :: (MonadIO m, IsBin o) => o -> m Bool
- setBinMessageForward :: (MonadIO m, IsBin o) => o -> Bool -> m ()
- type BinDeepElementAddedCallback = Bin -> Element -> IO ()
- type C_BinDeepElementAddedCallback = Ptr () -> Ptr Bin -> Ptr Element -> Ptr () -> IO ()
- afterBinDeepElementAdded :: (IsBin a, MonadIO m) => a -> BinDeepElementAddedCallback -> m SignalHandlerId
- genClosure_BinDeepElementAdded :: MonadIO m => BinDeepElementAddedCallback -> m (GClosure C_BinDeepElementAddedCallback)
- mk_BinDeepElementAddedCallback :: C_BinDeepElementAddedCallback -> IO (FunPtr C_BinDeepElementAddedCallback)
- noBinDeepElementAddedCallback :: Maybe BinDeepElementAddedCallback
- onBinDeepElementAdded :: (IsBin a, MonadIO m) => a -> BinDeepElementAddedCallback -> m SignalHandlerId
- wrap_BinDeepElementAddedCallback :: BinDeepElementAddedCallback -> C_BinDeepElementAddedCallback
- type BinDeepElementRemovedCallback = Bin -> Element -> IO ()
- type C_BinDeepElementRemovedCallback = Ptr () -> Ptr Bin -> Ptr Element -> Ptr () -> IO ()
- afterBinDeepElementRemoved :: (IsBin a, MonadIO m) => a -> BinDeepElementRemovedCallback -> m SignalHandlerId
- genClosure_BinDeepElementRemoved :: MonadIO m => BinDeepElementRemovedCallback -> m (GClosure C_BinDeepElementRemovedCallback)
- mk_BinDeepElementRemovedCallback :: C_BinDeepElementRemovedCallback -> IO (FunPtr C_BinDeepElementRemovedCallback)
- noBinDeepElementRemovedCallback :: Maybe BinDeepElementRemovedCallback
- onBinDeepElementRemoved :: (IsBin a, MonadIO m) => a -> BinDeepElementRemovedCallback -> m SignalHandlerId
- wrap_BinDeepElementRemovedCallback :: BinDeepElementRemovedCallback -> C_BinDeepElementRemovedCallback
- type BinDoLatencyCallback = IO Bool
- type C_BinDoLatencyCallback = Ptr () -> Ptr () -> IO CInt
- afterBinDoLatency :: (IsBin a, MonadIO m) => a -> BinDoLatencyCallback -> m SignalHandlerId
- genClosure_BinDoLatency :: MonadIO m => BinDoLatencyCallback -> m (GClosure C_BinDoLatencyCallback)
- mk_BinDoLatencyCallback :: C_BinDoLatencyCallback -> IO (FunPtr C_BinDoLatencyCallback)
- noBinDoLatencyCallback :: Maybe BinDoLatencyCallback
- onBinDoLatency :: (IsBin a, MonadIO m) => a -> BinDoLatencyCallback -> m SignalHandlerId
- wrap_BinDoLatencyCallback :: BinDoLatencyCallback -> C_BinDoLatencyCallback
- type BinElementAddedCallback = Element -> IO ()
- type C_BinElementAddedCallback = Ptr () -> Ptr Element -> Ptr () -> IO ()
- afterBinElementAdded :: (IsBin a, MonadIO m) => a -> BinElementAddedCallback -> m SignalHandlerId
- genClosure_BinElementAdded :: MonadIO m => BinElementAddedCallback -> m (GClosure C_BinElementAddedCallback)
- mk_BinElementAddedCallback :: C_BinElementAddedCallback -> IO (FunPtr C_BinElementAddedCallback)
- noBinElementAddedCallback :: Maybe BinElementAddedCallback
- onBinElementAdded :: (IsBin a, MonadIO m) => a -> BinElementAddedCallback -> m SignalHandlerId
- wrap_BinElementAddedCallback :: BinElementAddedCallback -> C_BinElementAddedCallback
- type BinElementRemovedCallback = Element -> IO ()
- type C_BinElementRemovedCallback = Ptr () -> Ptr Element -> Ptr () -> IO ()
- afterBinElementRemoved :: (IsBin a, MonadIO m) => a -> BinElementRemovedCallback -> m SignalHandlerId
- genClosure_BinElementRemoved :: MonadIO m => BinElementRemovedCallback -> m (GClosure C_BinElementRemovedCallback)
- mk_BinElementRemovedCallback :: C_BinElementRemovedCallback -> IO (FunPtr C_BinElementRemovedCallback)
- noBinElementRemovedCallback :: Maybe BinElementRemovedCallback
- onBinElementRemoved :: (IsBin a, MonadIO m) => a -> BinElementRemovedCallback -> m SignalHandlerId
- wrap_BinElementRemovedCallback :: BinElementRemovedCallback -> C_BinElementRemovedCallback
Exported types
Memory-managed wrapper type.
Bin (ManagedPtr Bin) |
Instances
GObject Bin Source # | |
Defined in GI.Gst.Objects.Bin gobjectType :: IO GType # | |
HasParentTypes Bin Source # | |
Defined in GI.Gst.Objects.Bin | |
type ParentTypes Bin Source # | |
Defined in GI.Gst.Objects.Bin |
class (GObject o, IsDescendantOf Bin o) => IsBin o Source #
Instances
(GObject o, IsDescendantOf Bin o) => IsBin o Source # | |
Defined in GI.Gst.Objects.Bin |
Methods
add
:: (HasCallStack, MonadIO m, IsBin a, IsElement b) | |
=> a |
|
-> b |
|
-> m Bool | Returns: |
Adds the given element to the bin. Sets the element's parent, and thus takes ownership of the element. An element can only be added to one bin.
If the element's pads are linked to other pads, the pads will be unlinked before the element is added to the bin.
When you add an element to an already-running pipeline, you will have to take care to set the state of the newly-added element to the desired state (usually PLAYING or PAUSED, same you set the pipeline to originally) with 'GI.Gst.Objects.Element.elementSetState', or use 'GI.Gst.Objects.Element.elementSyncStateWithParent'. The bin or pipeline will not take care of this for you.
MT safe.
findUnlinkedPad
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> PadDirection |
|
-> m (Maybe Pad) | Returns: unlinked pad of the given
direction, |
Recursively looks for elements with an unlinked pad of the given
direction within the specified bin and returns an unlinked pad
if one is found, or Nothing
otherwise. If a pad is found, the caller
owns a reference to it and should use objectUnref
on the
pad when it is not needed any longer.
getByInterface
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> GType |
|
-> m (Maybe Element) | Returns: A |
Looks for an element inside the bin that implements the given
interface. If such an element is found, it returns the element.
You can cast this element to the given interface afterwards. If you want
all elements that implement the interface, use
binIterateAllByInterface
. This function recurses into child bins.
MT safe. Caller owns returned reference.
getByName
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> Text |
|
-> m (Maybe Element) |
Gets the element with the given name from a bin. This function recurses into child bins.
Returns Nothing
if no element with the given name is found in the bin.
MT safe. Caller owns returned reference.
getByNameRecurseUp
binGetByNameRecurseUp Source #
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> Text |
|
-> m (Maybe Element) |
Gets the element with the given name from this bin. If the element is not found, a recursion is performed on the parent bin.
Returns Nothing
if:
- no element with the given name is found in the bin
MT safe. Caller owns returned reference.
getSuppressedFlags
binGetSuppressedFlags Source #
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> m [ElementFlags] | Returns: the bin's suppressed |
Return the suppressed flags of the bin.
MT safe.
Since: 1.10
iterateAllByInterface
binIterateAllByInterface Source #
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> GType |
|
-> m (Maybe Iterator) | Returns: a |
Looks for all elements inside the bin that implements the given
interface. You can safely cast all returned elements to the given interface.
The function recurses inside child bins. The iterator will yield a series
of Element
that should be unreffed after use.
MT safe. Caller owns returned value.
iterateElements
Gets an iterator for the elements in this bin.
MT safe. Caller owns returned value.
iterateRecurse
Gets an iterator for the elements in this bin. This iterator recurses into GstBin children.
MT safe. Caller owns returned value.
iterateSinks
Gets an iterator for all elements in the bin that have the
GST_ELEMENT_FLAG_SINK
flag set.
MT safe. Caller owns returned value.
iterateSorted
Gets an iterator for the elements in this bin in topologically sorted order. This means that the elements are returned from the most downstream elements (sinks) to the sources.
This function is used internally to perform the state changes of the bin elements and for clock selection.
MT safe. Caller owns returned value.
iterateSources
Gets an iterator for all elements in the bin that have the
GST_ELEMENT_FLAG_SOURCE
flag set.
MT safe. Caller owns returned value.
new
Creates a new bin with the given name.
recalculateLatency
binRecalculateLatency Source #
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> m Bool | Returns: |
Query bin
for the current latency using and reconfigures this latency to all the
elements with a LATENCY event.
This method is typically called on the pipeline when a GST_MESSAGE_LATENCY
is posted on the bus.
This function simply emits the 'do-latency' signal so any custom latency calculations will be performed.
remove
:: (HasCallStack, MonadIO m, IsBin a, IsElement b) | |
=> a |
|
-> b |
|
-> m Bool | Returns: |
Removes the element from the bin, unparenting it as well.
Unparenting the element means that the element will be dereferenced,
so if the bin holds the only reference to the element, the element
will be freed in the process of removing it from the bin. If you
want the element to still exist after removing, you need to call
objectRef
before removing it from the bin.
If the element's pads are linked to other pads, the pads will be unlinked before the element is removed from the bin.
MT safe.
setSuppressedFlags
binSetSuppressedFlags Source #
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> [ElementFlags] |
|
-> m () |
Suppress the given flags on the bin. ElementFlags
of a
child element are propagated when it is added to the bin.
When suppressed flags are set, those specified flags will
not be propagated to the bin.
MT safe.
Since: 1.10
syncChildrenStates
binSyncChildrenStates Source #
:: (HasCallStack, MonadIO m, IsBin a) | |
=> a |
|
-> m Bool | Returns: |
Synchronizes the state of every child of bin
with the state
of bin
. See also elementSyncStateWithParent
.
Since: 1.6
Properties
asyncHandling
If set to True
, the bin will handle asynchronous state changes.
This should be used only if the bin subclass is modifying the state
of its children on its own.
constructBinAsyncHandling :: IsBin o => Bool -> IO (GValueConstruct o) Source #
Construct a GValueConstruct
with valid value for the “async-handling
” property. This is rarely needed directly, but it is used by new
.
getBinAsyncHandling :: (MonadIO m, IsBin o) => o -> m Bool Source #
Get the value of the “async-handling
” property.
When overloading is enabled, this is equivalent to
get
bin #asyncHandling
setBinAsyncHandling :: (MonadIO m, IsBin o) => o -> Bool -> m () Source #
Set the value of the “async-handling
” property.
When overloading is enabled, this is equivalent to
set
bin [ #asyncHandling:=
value ]
messageForward
Forward all children messages, even those that would normally be filtered by the bin. This can be interesting when one wants to be notified of the EOS state of individual elements, for example.
The messages are converted to an ELEMENT message with the bin as the source. The structure of the message is named 'GstBinForwarded' and contains a field named 'message' of type GST_TYPE_MESSAGE that contains the original forwarded message.
constructBinMessageForward :: IsBin o => Bool -> IO (GValueConstruct o) Source #
Construct a GValueConstruct
with valid value for the “message-forward
” property. This is rarely needed directly, but it is used by new
.
getBinMessageForward :: (MonadIO m, IsBin o) => o -> m Bool Source #
Get the value of the “message-forward
” property.
When overloading is enabled, this is equivalent to
get
bin #messageForward
setBinMessageForward :: (MonadIO m, IsBin o) => o -> Bool -> m () Source #
Set the value of the “message-forward
” property.
When overloading is enabled, this is equivalent to
set
bin [ #messageForward:=
value ]
Signals
deepElementAdded
type BinDeepElementAddedCallback Source #
= Bin |
|
-> Element |
|
-> IO () |
Will be emitted after the element was added to sub_bin.
Since: 1.10
type C_BinDeepElementAddedCallback = Ptr () -> Ptr Bin -> Ptr Element -> Ptr () -> IO () Source #
Type for the callback on the (unwrapped) C side.
afterBinDeepElementAdded :: (IsBin a, MonadIO m) => a -> BinDeepElementAddedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “deep-element-added
” signal, to be run after the default handler.
When overloading is enabled, this is equivalent to
after
bin #deepElementAdded callback
genClosure_BinDeepElementAdded :: MonadIO m => BinDeepElementAddedCallback -> m (GClosure C_BinDeepElementAddedCallback) Source #
Wrap the callback into a GClosure
.
mk_BinDeepElementAddedCallback :: C_BinDeepElementAddedCallback -> IO (FunPtr C_BinDeepElementAddedCallback) Source #
Generate a function pointer callable from C code, from a C_BinDeepElementAddedCallback
.
noBinDeepElementAddedCallback :: Maybe BinDeepElementAddedCallback Source #
A convenience synonym for
.Nothing
:: Maybe
BinDeepElementAddedCallback
onBinDeepElementAdded :: (IsBin a, MonadIO m) => a -> BinDeepElementAddedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “deep-element-added
” signal, to be run before the default handler.
When overloading is enabled, this is equivalent to
on
bin #deepElementAdded callback
wrap_BinDeepElementAddedCallback :: BinDeepElementAddedCallback -> C_BinDeepElementAddedCallback Source #
Wrap a BinDeepElementAddedCallback
into a C_BinDeepElementAddedCallback
.
deepElementRemoved
type BinDeepElementRemovedCallback Source #
= Bin |
|
-> Element |
|
-> IO () |
Will be emitted after the element was removed from sub_bin.
Since: 1.10
type C_BinDeepElementRemovedCallback = Ptr () -> Ptr Bin -> Ptr Element -> Ptr () -> IO () Source #
Type for the callback on the (unwrapped) C side.
afterBinDeepElementRemoved :: (IsBin a, MonadIO m) => a -> BinDeepElementRemovedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “deep-element-removed
” signal, to be run after the default handler.
When overloading is enabled, this is equivalent to
after
bin #deepElementRemoved callback
genClosure_BinDeepElementRemoved :: MonadIO m => BinDeepElementRemovedCallback -> m (GClosure C_BinDeepElementRemovedCallback) Source #
Wrap the callback into a GClosure
.
mk_BinDeepElementRemovedCallback :: C_BinDeepElementRemovedCallback -> IO (FunPtr C_BinDeepElementRemovedCallback) Source #
Generate a function pointer callable from C code, from a C_BinDeepElementRemovedCallback
.
noBinDeepElementRemovedCallback :: Maybe BinDeepElementRemovedCallback Source #
A convenience synonym for
.Nothing
:: Maybe
BinDeepElementRemovedCallback
onBinDeepElementRemoved :: (IsBin a, MonadIO m) => a -> BinDeepElementRemovedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “deep-element-removed
” signal, to be run before the default handler.
When overloading is enabled, this is equivalent to
on
bin #deepElementRemoved callback
wrap_BinDeepElementRemovedCallback :: BinDeepElementRemovedCallback -> C_BinDeepElementRemovedCallback Source #
Wrap a BinDeepElementRemovedCallback
into a C_BinDeepElementRemovedCallback
.
doLatency
type BinDoLatencyCallback = IO Bool Source #
Will be emitted when the bin needs to perform latency calculations. This signal is only emitted for toplevel bins or when async-handling is enabled.
Only one signal handler is invoked. If no signals are connected, the default handler is invoked, which will query and distribute the lowest possible latency to all sinks.
Connect to this signal if the default latency calculations are not sufficient, like when you need different latencies for different sinks in the same pipeline.
type C_BinDoLatencyCallback = Ptr () -> Ptr () -> IO CInt Source #
Type for the callback on the (unwrapped) C side.
afterBinDoLatency :: (IsBin a, MonadIO m) => a -> BinDoLatencyCallback -> m SignalHandlerId Source #
Connect a signal handler for the “do-latency
” signal, to be run after the default handler.
When overloading is enabled, this is equivalent to
after
bin #doLatency callback
genClosure_BinDoLatency :: MonadIO m => BinDoLatencyCallback -> m (GClosure C_BinDoLatencyCallback) Source #
Wrap the callback into a GClosure
.
mk_BinDoLatencyCallback :: C_BinDoLatencyCallback -> IO (FunPtr C_BinDoLatencyCallback) Source #
Generate a function pointer callable from C code, from a C_BinDoLatencyCallback
.
noBinDoLatencyCallback :: Maybe BinDoLatencyCallback Source #
A convenience synonym for
.Nothing
:: Maybe
BinDoLatencyCallback
onBinDoLatency :: (IsBin a, MonadIO m) => a -> BinDoLatencyCallback -> m SignalHandlerId Source #
Connect a signal handler for the “do-latency
” signal, to be run before the default handler.
When overloading is enabled, this is equivalent to
on
bin #doLatency callback
wrap_BinDoLatencyCallback :: BinDoLatencyCallback -> C_BinDoLatencyCallback Source #
Wrap a BinDoLatencyCallback
into a C_BinDoLatencyCallback
.
elementAdded
type BinElementAddedCallback Source #
Will be emitted after the element was added to the bin.
type C_BinElementAddedCallback = Ptr () -> Ptr Element -> Ptr () -> IO () Source #
Type for the callback on the (unwrapped) C side.
afterBinElementAdded :: (IsBin a, MonadIO m) => a -> BinElementAddedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “element-added
” signal, to be run after the default handler.
When overloading is enabled, this is equivalent to
after
bin #elementAdded callback
genClosure_BinElementAdded :: MonadIO m => BinElementAddedCallback -> m (GClosure C_BinElementAddedCallback) Source #
Wrap the callback into a GClosure
.
mk_BinElementAddedCallback :: C_BinElementAddedCallback -> IO (FunPtr C_BinElementAddedCallback) Source #
Generate a function pointer callable from C code, from a C_BinElementAddedCallback
.
noBinElementAddedCallback :: Maybe BinElementAddedCallback Source #
A convenience synonym for
.Nothing
:: Maybe
BinElementAddedCallback
onBinElementAdded :: (IsBin a, MonadIO m) => a -> BinElementAddedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “element-added
” signal, to be run before the default handler.
When overloading is enabled, this is equivalent to
on
bin #elementAdded callback
wrap_BinElementAddedCallback :: BinElementAddedCallback -> C_BinElementAddedCallback Source #
Wrap a BinElementAddedCallback
into a C_BinElementAddedCallback
.
elementRemoved
type BinElementRemovedCallback Source #
Will be emitted after the element was removed from the bin.
type C_BinElementRemovedCallback = Ptr () -> Ptr Element -> Ptr () -> IO () Source #
Type for the callback on the (unwrapped) C side.
afterBinElementRemoved :: (IsBin a, MonadIO m) => a -> BinElementRemovedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “element-removed
” signal, to be run after the default handler.
When overloading is enabled, this is equivalent to
after
bin #elementRemoved callback
genClosure_BinElementRemoved :: MonadIO m => BinElementRemovedCallback -> m (GClosure C_BinElementRemovedCallback) Source #
Wrap the callback into a GClosure
.
mk_BinElementRemovedCallback :: C_BinElementRemovedCallback -> IO (FunPtr C_BinElementRemovedCallback) Source #
Generate a function pointer callable from C code, from a C_BinElementRemovedCallback
.
noBinElementRemovedCallback :: Maybe BinElementRemovedCallback Source #
A convenience synonym for
.Nothing
:: Maybe
BinElementRemovedCallback
onBinElementRemoved :: (IsBin a, MonadIO m) => a -> BinElementRemovedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “element-removed
” signal, to be run before the default handler.
When overloading is enabled, this is equivalent to
on
bin #elementRemoved callback