Enum winit::event::Ime

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pub enum Ime {
    Enabled,
    Preedit(String, Option<(usize, usize)>),
    Commit(String),
    Disabled,
}
Expand description

Describes input method events.

This is also called a “composition event”.

Most keypresses using a latin-like keyboard layout simply generate a WindowEvent::KeyboardInput. However, one couldn’t possibly have a key for every single unicode character that the user might want to type

  • so the solution operating systems employ is to allow the user to type these using a sequence of keypresses instead.

A prominent example of this is accents - many keyboard layouts allow you to first click the “accent key”, and then the character you want to apply the accent to. In this case, some platforms will generate the following event sequence:

// Press "`" key
Ime::Preedit("`", Some((0, 0)))
// Press "E" key
Ime::Preedit("", None) // Synthetic event generated by winit to clear preedit.
Ime::Commit("é")

Additionally, certain input devices are configured to display a candidate box that allow the user to select the desired character interactively. (To properly position this box, you must use Window::set_ime_cursor_area.)

An example of a keyboard layout which uses candidate boxes is pinyin. On a latin keyboard the following event sequence could be obtained:

// Press "A" key
Ime::Preedit("a", Some((1, 1)))
// Press "B" key
Ime::Preedit("a b", Some((3, 3)))
// Press left arrow key
Ime::Preedit("a b", Some((1, 1)))
// Press space key
Ime::Preedit("啊b", Some((3, 3)))
// Press space key
Ime::Preedit("", None) // Synthetic event generated by winit to clear preedit.
Ime::Commit("啊不")

Variants§

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Enabled

Notifies when the IME was enabled.

After getting this event you could receive Preedit and Commit events. You should also start performing IME related requests like Window::set_ime_cursor_area.

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Preedit(String, Option<(usize, usize)>)

Notifies when a new composing text should be set at the cursor position.

The value represents a pair of the preedit string and the cursor begin position and end position. When it’s None, the cursor should be hidden. When String is an empty string this indicates that preedit was cleared.

The cursor position is byte-wise indexed.

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Commit(String)

Notifies when text should be inserted into the editor widget.

Right before this event winit will send empty Self::Preedit event.

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Disabled

Notifies when the IME was disabled.

After receiving this event you won’t get any more Preedit or Commit events until the next Enabled event. You should also stop issuing IME related requests like Window::set_ime_cursor_area and clear pending preedit text.

Trait Implementations§

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impl Clone for Ime

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fn clone(&self) -> Ime

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Ime

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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 Hash for Ime

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for Ime

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fn eq(&self, other: &Ime) -> 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 Ime

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impl StructuralEq for Ime

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impl StructuralPartialEq for Ime

Auto Trait Implementations§

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impl RefUnwindSafe for Ime

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impl Send for Ime

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impl Sync for Ime

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impl Unpin for Ime

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impl UnwindSafe for Ime

Blanket Implementations§

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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> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more