[−][src]Struct newt::callbacks::Callback
A callback called when a newt Component
is activated.
Example
extern crate newt; use newt::Callback; use newt::prelude::*; pub fn main() { newt::init().unwrap(); newt::cls(); newt::centered_window(20, 6, Some("Callback Test")).unwrap(); let cb1 = Checkbox::new(3, 1, "Check 1", None, None); let cb2 = Checkbox::new(3, 2, "Check 2", None, None); let ok = CompactButton::new(7, 4, "Ok"); let mut form = Form::new(None, 0); form.add_components(&[&cb1, &cb2, &ok]).unwrap(); let mut value: i32 = 0; // Closure `f` borrows `value` as mutable so create a new subscope here // allowing `value` to be borrowed immutably when printing the result later. { // Create closure to be called by Callback let mut f = |_c: &dyn Component, data: Option<&i32>| { value = *data.unwrap(); }; // Create Callback with first Checkbox using `5` as data. let mut callback = Callback::new(&cb1, &mut f, Some(5)); // Add second Checkbox using `10` as data. callback.add_component(&cb2, Some(10)); form.run().unwrap(); newt::finished(); } // `value` will be 0, 5, or 10 depending on the last Checkbox "clicked". println!("value = {}", value); }
Methods
impl<'a, FN: 'a, T: 'a> Callback<'a, FN, T> where
FN: FnMut(&dyn Component, Option<&T>),
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FN: FnMut(&dyn Component, Option<&T>),
pub fn new(
component: &'a dyn Component,
function: FN,
data: Option<T>
) -> Box<Callback<'a, FN, T>>
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component: &'a dyn Component,
function: FN,
data: Option<T>
) -> Box<Callback<'a, FN, T>>
Create a new Callback
using the function or closure function
and
associate it with component
.
component
- TheComponent
associated with the callback.function
- The function or closure to call when theComponent
is activated.data
- Optional user data to pass to the function.
pub fn add_component(&mut self, component: &'a dyn Component, data: Option<T>)
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Associate another component with the Callback
.
component
- AnotherComponent
to associate with the callback.data
- Optional user data to pass to the function.
Trait Implementations
impl<'a, FN: 'a, T: 'a> Drop for Callback<'a, FN, T> where
FN: FnMut(&dyn Component, Option<&T>),
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FN: FnMut(&dyn Component, Option<&T>),
Auto Trait Implementations
impl<'a, FN, T> !Send for Callback<'a, FN, T>
impl<'a, FN, T> Unpin for Callback<'a, FN, T> where
FN: Unpin,
T: Unpin,
FN: Unpin,
T: Unpin,
impl<'a, FN, T> !Sync for Callback<'a, FN, T>
impl<'a, FN, T> !UnwindSafe for Callback<'a, FN, T>
impl<'a, FN, T> !RefUnwindSafe for Callback<'a, FN, T>
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for 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.
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>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,