pub struct SignalHandlerId(/* private fields */);
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)
        }
    }
}

Implementations§

source§

impl SignalHandlerId

source

pub unsafe fn as_raw(&self) -> c_ulong

Returns the internal signal handler ID.

Trait Implementations§

source§

impl Debug for SignalHandlerId

source§

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

Formats the value using the given formatter. Read more
source§

impl FromGlib<u64> for SignalHandlerId

source§

unsafe fn from_glib(val: c_ulong) -> Self

source§

impl PartialEq for SignalHandlerId

source§

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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.
source§

impl Eq for SignalHandlerId

source§

impl StructuralEq for SignalHandlerId

source§

impl StructuralPartialEq for SignalHandlerId

Auto Trait Implementations§

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

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

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.

source§

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

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

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

§

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

The type returned in the event of a conversion error.
source§

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

Performs the conversion.