[−][src]Struct lv2_sys::LV2UI_Port_Subscribe
Feature to subscribe to port updates (LV2_UI__portSubscribe).
Fields
handle: LV2UI_Feature_Handle
Pointer to opaque data which must be passed to subscribe() and unsubscribe().
subscribe: Option<unsafe extern "C" fn(handle: LV2UI_Feature_Handle, port_index: u32, port_protocol: u32, features: *const *const LV2_Feature) -> u32>
Subscribe to updates for a port.
This means that the host will call the UI's port_event() function when the port value changes (as defined by protocol).
Calling this function with the same port_index
and port_protocol
as an already active subscription has no effect.
@param handle The handle field of this struct. @param port_index The index of the port. @param port_protocol The URID of the ui:PortProtocol. @param features Features for this subscription. @return 0 on success.
unsubscribe: Option<unsafe extern "C" fn(handle: LV2UI_Feature_Handle, port_index: u32, port_protocol: u32, features: *const *const LV2_Feature) -> u32>
Unsubscribe from updates for a port.
This means that the host will cease calling calling port_event() when the port value changes.
Calling this function with a port_index
and port_protocol
that
does not refer to an active port subscription has no effect.
@param handle The handle field of this struct. @param port_index The index of the port. @param port_protocol The URID of the ui:PortProtocol. @param features Features for this subscription. @return 0 on success.
Trait Implementations
impl Clone for LV2UI_Port_Subscribe
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fn clone(&self) -> LV2UI_Port_Subscribe
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fn clone_from(&mut self, source: &Self)
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impl Copy for LV2UI_Port_Subscribe
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impl Debug for LV2UI_Port_Subscribe
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Auto Trait Implementations
impl RefUnwindSafe for LV2UI_Port_Subscribe
impl !Send for LV2UI_Port_Subscribe
impl !Sync for LV2UI_Port_Subscribe
impl Unpin for LV2UI_Port_Subscribe
impl UnwindSafe for LV2UI_Port_Subscribe
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,