pub struct SignalHandlerId(_);
Expand description

The id of a signal that is returned by connect.

This type does not implement Clone to prevent disconnecting the same signal handler multiple times.

use glib::SignalHandlerId;
use gtk::prelude::*;
use std::cell::RefCell;

struct Button {
    widget: gtk::Button,
    clicked_handler_id: RefCell<Option<SignalHandlerId>>,
}

impl Button {
    fn new() -> Self {
        let widget = gtk::Button::new();
        let clicked_handler_id = RefCell::new(Some(widget.connect_clicked(|_button| {
            // Do something.
        })));
        Self {
            widget,
            clicked_handler_id,
        }
    }

    fn disconnect(&self) {
        if let Some(id) = self.clicked_handler_id.take() {
            self.widget.disconnect(id)
        }
    }
}

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impl SignalHandlerId

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pub unsafe fn as_raw(&self) -> c_ulong

Returns the internal signal handler ID.

Trait Implementations§

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impl Debug for SignalHandlerId

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl FromGlib<u64> for SignalHandlerId

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unsafe fn from_glib(val: c_ulong) -> Self

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impl PartialEq<SignalHandlerId> for SignalHandlerId

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fn eq(&self, other: &SignalHandlerId) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for SignalHandlerId

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impl StructuralEq for SignalHandlerId

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impl StructuralPartialEq for SignalHandlerId

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source§

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 Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.