glib::subclass::signal

Struct SignalBuilder

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pub struct SignalBuilder { /* private fields */ }
Expand description

Builder for signals.

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impl SignalBuilder

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pub fn param_types( self, param_types: impl IntoIterator<Item = impl Into<SignalType>>, ) -> Self

The signal’s parameters.

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pub fn return_type<T: StaticType>(self) -> Self

The signal’s returned value type.

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pub fn return_type_from(self, type_: impl Into<SignalType>) -> Self

The signal’s returned value type.

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pub fn run_first(self) -> Self

Run the signal class handler in the first emission stage.

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pub fn run_last(self) -> Self

Run the signal class handler in the third emission stage.

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pub fn run_cleanup(self) -> Self

Run the signal class handler in the last emission stage.

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pub fn no_recurse(self) -> Self

Signals being emitted for an object while currently being in emission for this very object will not be emitted recursively, but instead cause the first emission to be restarted.

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pub fn detailed(self) -> Self

This signal supports “::detail” appendices to the signal name upon handler connections and emissions.

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pub fn action(self) -> Self

Action signals are signals that may freely be emitted on alive objects from user code.

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pub fn no_hooks(self) -> Self

No emissions hooks are supported for this signal.

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pub fn must_collect(self) -> Self

Varargs signal emission will always collect the arguments, even if there are no signal handlers connected.

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pub fn deprecated(self) -> Self

The signal is deprecated and will be removed in a future version.

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pub fn flags(self, flags: SignalFlags) -> Self

Explicitly set all flags.

This overrides previously set flags on this builder.

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pub fn class_handler<F: Fn(&SignalClassHandlerToken, &[Value]) -> Option<Value> + Send + Sync + 'static>( self, func: F, ) -> Self

Class handler for this signal.

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pub fn accumulator<F: Fn(&SignalInvocationHint, &mut Value, &Value) -> bool + Send + Sync + 'static>( self, func: F, ) -> Self

Accumulator for the return values of the signal.

This is called if multiple signal handlers are connected to the signal for accumulating the return values into a single value.

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pub fn build(self) -> Signal

Build the signal.

This does not register the signal yet, which only happens as part of object type registration.

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.