Struct gtk4::TextTagTable

source ·
pub struct TextTagTable { /* private fields */ }
Expand description

The collection of tags in a TextBuffer

You may wish to begin by reading the text widget conceptual overview, which gives an overview of all the objects and data types related to the text widget and how they work together.

§GtkTextTagTables as GtkBuildable

The TextTagTable implementation of the Buildable interface supports adding tags by specifying “tag” as the “type” attribute of a <child> element.

An example of a UI definition fragment specifying tags:

<object class="GtkTextTagTable">
 <child type="tag">
   <object class="GtkTextTag"/>
 </child>
</object>

§Signals

§tag-added

Emitted every time a new tag is added in the TextTagTable.

§tag-changed

Emitted every time a tag in the TextTagTable changes.

§tag-removed

Emitted every time a tag is removed from the TextTagTable.

The @tag is still valid by the time the signal is emitted, but it is not associated with a tag table any more.

§Implements

[trait@glib::ObjectExt], BuildableExt

Implementations§

source§

impl TextTagTable

source

pub fn new() -> TextTagTable

Creates a new TextTagTable.

The table contains no tags by default.

§Returns

a new TextTagTable

source

pub fn add(&self, tag: &impl IsA<TextTag>) -> bool

Add a tag to the table.

The tag is assigned the highest priority in the table.

@tag must not be in a tag table already, and may not have the same name as an already-added tag.

§tag

a TextTag

§Returns

true on success.

source

pub fn foreach<P: FnMut(&TextTag)>(&self, func: P)

Calls @func on each tag in @self, with user data @data.

Note that the table may not be modified while iterating over it (you can’t add/remove tags).

§func

a function to call on each tag

source

pub fn size(&self) -> i32

Returns the size of the table (number of tags)

§Returns

number of tags in @self

source

pub fn lookup(&self, name: &str) -> Option<TextTag>

Look up a named tag.

§name

name of a tag

§Returns

The tag

source

pub fn remove(&self, tag: &impl IsA<TextTag>)

Remove a tag from the table.

If a TextBuffer has @self as its tag table, the tag is removed from the buffer. The table’s reference to the tag is removed, so the tag will end up destroyed if you don’t have a reference to it.

§tag

a TextTag

source

pub fn connect_tag_added<F: Fn(&Self, &TextTag) + 'static>( &self, f: F ) -> SignalHandlerId

Emitted every time a new tag is added in the TextTagTable.

§tag

the added tag.

source

pub fn connect_tag_changed<F: Fn(&Self, &TextTag, bool) + 'static>( &self, f: F ) -> SignalHandlerId

Emitted every time a tag in the TextTagTable changes.

§tag

the changed tag.

§size_changed

whether the change affects the TextView layout.

source

pub fn connect_tag_removed<F: Fn(&Self, &TextTag) + 'static>( &self, f: F ) -> SignalHandlerId

Emitted every time a tag is removed from the TextTagTable.

The @tag is still valid by the time the signal is emitted, but it is not associated with a tag table any more.

§tag

the removed tag.

Trait Implementations§

source§

impl Clone for TextTagTable

source§

fn clone(&self) -> Self

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl Debug for TextTagTable

source§

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

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

impl Default for TextTagTable

source§

fn default() -> Self

Returns the “default value” for a type. Read more
source§

impl HasParamSpec for TextTagTable

§

type ParamSpec = ParamSpecObject

§

type SetValue = TextTagTable

Preferred value to be used as setter for the associated ParamSpec.
§

type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, TextTagTable>

source§

fn param_spec_builder() -> Self::BuilderFn

source§

impl Hash for TextTagTable

source§

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

Feeds this value into the given Hasher. Read more
1.3.0 · source§

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
source§

impl Ord for TextTagTable

source§

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · source§

fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · source§

fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
source§

impl ParentClassIs for TextTagTable

source§

impl<OT: ObjectType> PartialEq<OT> for TextTagTable

source§

fn eq(&self, other: &OT) -> 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<OT: ObjectType> PartialOrd<OT> for TextTagTable

source§

fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · source§

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · source§

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
source§

impl StaticType for TextTagTable

source§

fn static_type() -> Type

Returns the type identifier of Self.
source§

impl Eq for TextTagTable

source§

impl IsA<Buildable> for TextTagTable

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<O> BuildableExt for O
where O: IsA<Buildable>,

source§

fn buildable_id(&self) -> Option<GString>

Gets the ID of the @self object. Read more
source§

impl<T> Cast for T
where T: ObjectType,

source§

fn upcast<T>(self) -> T
where T: ObjectType, Self: IsA<T>,

Upcasts an object to a superclass or interface T. Read more
source§

fn upcast_ref<T>(&self) -> &T
where T: ObjectType, Self: IsA<T>,

Upcasts an object to a reference of its superclass or interface T. Read more
source§

fn downcast<T>(self) -> Result<T, Self>
where T: ObjectType, Self: MayDowncastTo<T>,

Tries to downcast to a subclass or interface implementor T. Read more
source§

fn downcast_ref<T>(&self) -> Option<&T>
where T: ObjectType, Self: MayDowncastTo<T>,

Tries to downcast to a reference of its subclass or interface implementor T. Read more
source§

fn dynamic_cast<T>(self) -> Result<T, Self>
where T: ObjectType,

Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while upcast will do many checks at compile-time already. downcast will perform the same checks at runtime as dynamic_cast, but will also ensure some amount of compile-time safety. Read more
source§

fn dynamic_cast_ref<T>(&self) -> Option<&T>
where T: ObjectType,

Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more
source§

unsafe fn unsafe_cast<T>(self) -> T
where T: ObjectType,

Casts to T unconditionally. Read more
source§

unsafe fn unsafe_cast_ref<T>(&self) -> &T
where T: ObjectType,

Casts to &T unconditionally. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for T

source§

unsafe fn from_glib_none_num_as_vec(ptr: *const GList, num: usize) -> Vec<T>

source§

unsafe fn from_glib_container_num_as_vec(_: *const GList, _: usize) -> Vec<T>

source§

unsafe fn from_glib_full_num_as_vec(_: *const GList, _: usize) -> Vec<T>

source§

impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for T

source§

unsafe fn from_glib_none_num_as_vec(ptr: *const GPtrArray, num: usize) -> Vec<T>

source§

unsafe fn from_glib_container_num_as_vec( _: *const GPtrArray, _: usize ) -> Vec<T>

source§

unsafe fn from_glib_full_num_as_vec(_: *const GPtrArray, _: usize) -> Vec<T>

source§

impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for T

source§

unsafe fn from_glib_none_num_as_vec(ptr: *const GSList, num: usize) -> Vec<T>

source§

unsafe fn from_glib_container_num_as_vec(_: *const GSList, _: usize) -> Vec<T>

source§

unsafe fn from_glib_full_num_as_vec(_: *const GSList, _: usize) -> Vec<T>

source§

impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for T

source§

unsafe fn from_glib_none_num_as_vec(ptr: *mut GList, num: usize) -> Vec<T>

source§

unsafe fn from_glib_container_num_as_vec(ptr: *mut GList, num: usize) -> Vec<T>

source§

unsafe fn from_glib_full_num_as_vec(ptr: *mut GList, num: usize) -> Vec<T>

source§

impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for T

source§

unsafe fn from_glib_none_num_as_vec(ptr: *mut GPtrArray, num: usize) -> Vec<T>

source§

unsafe fn from_glib_container_num_as_vec( ptr: *mut GPtrArray, num: usize ) -> Vec<T>

source§

unsafe fn from_glib_full_num_as_vec(ptr: *mut GPtrArray, num: usize) -> Vec<T>

source§

impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for T

source§

unsafe fn from_glib_none_num_as_vec(ptr: *mut GSList, num: usize) -> Vec<T>

source§

unsafe fn from_glib_container_num_as_vec(ptr: *mut GSList, num: usize) -> Vec<T>

source§

unsafe fn from_glib_full_num_as_vec(ptr: *mut GSList, num: usize) -> Vec<T>

source§

impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for T

source§

unsafe fn from_glib_none_as_vec(ptr: *const GList) -> Vec<T>

source§

unsafe fn from_glib_container_as_vec(_: *const GList) -> Vec<T>

source§

unsafe fn from_glib_full_as_vec(_: *const GList) -> Vec<T>

source§

impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for T

source§

unsafe fn from_glib_none_as_vec(ptr: *const GPtrArray) -> Vec<T>

source§

unsafe fn from_glib_container_as_vec(_: *const GPtrArray) -> Vec<T>

source§

unsafe fn from_glib_full_as_vec(_: *const GPtrArray) -> Vec<T>

source§

impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for T

source§

unsafe fn from_glib_none_as_vec(ptr: *const GSList) -> Vec<T>

source§

unsafe fn from_glib_container_as_vec(_: *const GSList) -> Vec<T>

source§

unsafe fn from_glib_full_as_vec(_: *const GSList) -> Vec<T>

source§

impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for T

source§

unsafe fn from_glib_none_as_vec(ptr: *mut GList) -> Vec<T>

source§

unsafe fn from_glib_container_as_vec(ptr: *mut GList) -> Vec<T>

source§

unsafe fn from_glib_full_as_vec(ptr: *mut GList) -> Vec<T>

source§

impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for T

source§

unsafe fn from_glib_none_as_vec(ptr: *mut GPtrArray) -> Vec<T>

source§

unsafe fn from_glib_container_as_vec(ptr: *mut GPtrArray) -> Vec<T>

source§

unsafe fn from_glib_full_as_vec(ptr: *mut GPtrArray) -> Vec<T>

source§

impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for T

source§

unsafe fn from_glib_none_as_vec(ptr: *mut GSList) -> Vec<T>

source§

unsafe fn from_glib_container_as_vec(ptr: *mut GSList) -> Vec<T>

source§

unsafe fn from_glib_full_as_vec(ptr: *mut GSList) -> Vec<T>

source§

impl<O> GObjectPropertyExpressionExt for O
where O: IsA<Object>,

source§

fn property_expression(&self, property_name: &str) -> PropertyExpression

Create an expression looking up an object’s property.
source§

fn property_expression_weak(&self, property_name: &str) -> PropertyExpression

Create an expression looking up an object’s property with a weak reference.
source§

fn this_expression(property_name: &str) -> PropertyExpression

Create an expression looking up a property in the bound this object.
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> IntoClosureReturnValue for T
where T: Into<Value>,

source§

impl<U> IsSubclassableExt for U

source§

impl<T> ObjectExt for T
where T: ObjectType,

source§

fn is<U>(&self) -> bool
where U: StaticType,

Returns true if the object is an instance of (can be cast to) T.
source§

fn type_(&self) -> Type

Returns the type of the object.
source§

fn object_class(&self) -> &Class<Object>

Returns the ObjectClass of the object. Read more
source§

fn class(&self) -> &Class<T>
where T: IsClass,

Returns the class of the object.
source§

fn class_of<U>(&self) -> Option<&Class<U>>
where U: IsClass,

Returns the class of the object in the given type T. Read more
source§

fn interface<U>(&self) -> Option<InterfaceRef<'_, U>>
where U: IsInterface,

Returns the interface T of the object. Read more
source§

fn set_property(&self, property_name: &str, value: impl Into<Value>)

Sets the property property_name of the object to value value. Read more
source§

fn set_property_from_value(&self, property_name: &str, value: &Value)

Sets the property property_name of the object to value value. Read more
source§

fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])

Sets multiple properties of the object at once. Read more
source§

fn set_properties_from_value(&self, property_values: &[(&str, Value)])

Sets multiple properties of the object at once. Read more
source§

fn property<V>(&self, property_name: &str) -> V
where V: for<'b> FromValue<'b> + 'static,

Gets the property property_name of the object and cast it to the type V. Read more
source§

fn property_value(&self, property_name: &str) -> Value

Gets the property property_name of the object. Read more
source§

fn has_property(&self, property_name: &str, type_: Option<Type>) -> bool

Check if the object has a property property_name of the given type_. Read more
source§

fn property_type(&self, property_name: &str) -> Option<Type>

Get the type of the property property_name of this object. Read more
source§

fn find_property(&self, property_name: &str) -> Option<ParamSpec>

Get the ParamSpec of the property property_name of this object.
source§

fn list_properties(&self) -> PtrSlice<ParamSpec>

Return all ParamSpec of the properties of this object.
source§

fn freeze_notify(&self) -> PropertyNotificationFreezeGuard

Freeze all property notifications until the return guard object is dropped. Read more
source§

unsafe fn set_qdata<QD>(&self, key: Quark, value: QD)
where QD: 'static,

Set arbitrary data on this object with the given key. Read more
source§

unsafe fn qdata<QD>(&self, key: Quark) -> Option<NonNull<QD>>
where QD: 'static,

Return previously set arbitrary data of this object with the given key. Read more
source§

unsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD>
where QD: 'static,

Retrieve previously set arbitrary data of this object with the given key. Read more
source§

unsafe fn set_data<QD>(&self, key: &str, value: QD)
where QD: 'static,

Set arbitrary data on this object with the given key. Read more
source§

unsafe fn data<QD>(&self, key: &str) -> Option<NonNull<QD>>
where QD: 'static,

Return previously set arbitrary data of this object with the given key. Read more
source§

unsafe fn steal_data<QD>(&self, key: &str) -> Option<QD>
where QD: 'static,

Retrieve previously set arbitrary data of this object with the given key. Read more
source§

fn block_signal(&self, handler_id: &SignalHandlerId)

Block a given signal handler. Read more
source§

fn unblock_signal(&self, handler_id: &SignalHandlerId)

Unblock a given signal handler.
source§

fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)

Stop emission of the currently emitted signal.
source§

fn stop_signal_emission_by_name(&self, signal_name: &str)

Stop emission of the currently emitted signal by the (possibly detailed) signal name.
source§

fn connect<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerId
where F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,

Connect to the signal signal_name on this object. Read more
source§

fn connect_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerId
where F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,

Connect to the signal signal_id on this object. Read more
source§

fn connect_local<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerId
where F: Fn(&[Value]) -> Option<Value> + 'static,

Connect to the signal signal_name on this object. Read more
source§

fn connect_local_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerId
where F: Fn(&[Value]) -> Option<Value> + 'static,

Connect to the signal signal_id on this object. Read more
source§

unsafe fn connect_unsafe<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerId
where F: Fn(&[Value]) -> Option<Value>,

Connect to the signal signal_name on this object. Read more
source§

unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerId
where F: Fn(&[Value]) -> Option<Value>,

Connect to the signal signal_id on this object. Read more
source§

fn connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure ) -> SignalHandlerId

Connect a closure to the signal signal_name on this object. Read more
source§

fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure ) -> SignalHandlerId

Connect a closure to the signal signal_id on this object. Read more
source§

fn watch_closure(&self, closure: &impl AsRef<Closure>)

Limits the lifetime of closure to the lifetime of the object. When the object’s reference count drops to zero, the closure will be invalidated. An invalidated closure will ignore any calls to invoke_with_values, or invoke when using Rust closures.
source§

fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> R

Emit signal by signal id. Read more
source§

fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>

Same as Self::emit but takes Value for the arguments.
source§

fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> R

Emit signal by its name. Read more
source§

fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value] ) -> Option<Value>

Emit signal by its name. Read more
source§

fn emit_by_name_with_details<R>( &self, signal_name: &str, details: Quark, args: &[&dyn ToValue] ) -> R

Emit signal by its name with details. Read more
source§

fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value] ) -> Option<Value>

Emit signal by its name with details. Read more
source§

fn emit_with_details<R>( &self, signal_id: SignalId, details: Quark, args: &[&dyn ToValue] ) -> R

Emit signal by signal id with details. Read more
source§

fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value] ) -> Option<Value>

Emit signal by signal id with details. Read more
source§

fn disconnect(&self, handler_id: SignalHandlerId)

Disconnect a previously connected signal handler.
source§

fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
where F: Fn(&T, &ParamSpec) + Send + Sync + 'static,

Connect to the notify signal of the object. Read more
source§

fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
where F: Fn(&T, &ParamSpec) + 'static,

Connect to the notify signal of the object. Read more
source§

unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerId
where F: Fn(&T, &ParamSpec),

Connect to the notify signal of the object. Read more
source§

fn notify(&self, property_name: &str)

Notify that the given property has changed its value. Read more
source§

fn notify_by_pspec(&self, pspec: &ParamSpec)

Notify that the given property has changed its value. Read more
source§

fn downgrade(&self) -> WeakRef<T>

Downgrade this object to a weak reference.
source§

fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>
where F: FnOnce() + Send + 'static,

Add a callback to be notified when the Object is disposed.
source§

fn add_weak_ref_notify_local<F>(&self, f: F) -> WeakRefNotify<T>
where F: FnOnce() + 'static,

Add a callback to be notified when the Object is disposed. Read more
source§

fn bind_property<'f, 't, O, 'a>( &'a self, source_property: &'a str, target: &'a O, target_property: &'a str ) -> BindingBuilder<'a, 'f, 't>
where O: ObjectType,

Bind property source_property on this object to the target_property on the target object. Read more
source§

fn ref_count(&self) -> u32

Returns the strong reference count of this object.
source§

unsafe fn run_dispose(&self)

Runs the dispose mechanism of the object. Read more
source§

impl<T> Property for T
where T: HasParamSpec,

§

type Value = T

source§

impl<T> PropertyGet for T
where T: HasParamSpec,

§

type Value = T

source§

fn get<R, F>(&self, f: F) -> R
where F: Fn(&<T as PropertyGet>::Value) -> R,

source§

impl<T> StaticTypeExt for T
where T: StaticType,

source§

fn ensure_type()

Ensures that the type has been registered with the type system.
source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T> TransparentType for T

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> TryFromClosureReturnValue for T
where T: for<'a> FromValue<'a> + StaticType + 'static,

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.
source§

impl<'a, T, C, E> FromValueOptional<'a> for T
where T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError<E>>, E: Error + Send + 'static,

source§

impl<Super, Sub> MayDowncastTo<Sub> for Super
where Super: IsA<Super>, Sub: IsA<Super>,