Struct gdk4::Display[−][src]

pub struct Display(_);

Expand description

Display objects are the GDK representation of a workstation.

Their purpose are two-fold:

To manage and provide information about input devices (pointers, keyboards, etc)
To manage and provide information about output devices (monitors, projectors, etc)

Most of the input device handling has been factored out into separate Seat objects. Every display has a one or more seats, which can be accessed with DisplayExt::default_seat() and DisplayExt::list_seats().

Output devices are represented by Monitor objects, which can be accessed with DisplayExt::monitor_at_surface() and similar APIs.

Implements

DisplayExt, DisplayExtManual

Implementations

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impl Display

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pub fn default() -> Option<Display>

Gets the default Display.

This is a convenience function for:

gdk_display_manager_get_default_display (gdk_display_manager_get ())

Returns

a Display, or None if there is no default display

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pub fn open(display_name: &str) -> Option<Display>

Opens a display.

If opening the display fails, NULL is returned.

`display_name`

the name of the display to open

Returns

a Display

Trait Implementations

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impl Clone for Display

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fn clone(&self) -> Display

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 Display

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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 Display for Display

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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 Display

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

Feeds this value into the given Hasher. Read more

1.3.0[src]

fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

Feeds a slice of this type into the given Hasher. Read more

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impl Ord for Display

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

This method returns an Ordering between self and other. Read more

1.21.0[src]

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

Compares and returns the maximum of two values. Read more

1.21.0[src]

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

Compares and returns the minimum of two values. Read more

1.50.0[src]

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval. Read more

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impl ParentClassIs for Display

type Parent = Object

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impl<T: ObjectType> PartialEq<T> for Display

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

This method tests for self and other values to be equal, and is used by ==. Read more

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

This method tests for !=.

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impl<T: ObjectType> PartialOrd<T> for Display

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

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

1.0.0[src]

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[src]

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[src]

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[src]

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

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impl StaticType for Display

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fn static_type() -> Type

Returns the type identifier of Self.

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impl Eq for Display

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impl StructuralEq for Display

Auto Trait Implementations

impl RefUnwindSafe for Display

impl !Send for Display

impl !Sync for Display

impl Unpin for Display

impl UnwindSafe for Display

Blanket Implementations

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

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

Mutably borrows from an owned value. Read more

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

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

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

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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

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

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

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

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

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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 downcast and upcast will do many checks at compile-time already. Read more

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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

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

Casts to T unconditionally. Read more

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

Casts to &T unconditionally. Read more

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impl<T> From<T> for T

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pub fn from(t: T) -> T

Performs the conversion.

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

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pub fn into(self) -> U

Performs the conversion.

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

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

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

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pub fn set_property<'a, N, V>(
 &self,
 property_name: N,
 value: V
) -> Result<(), BoolError> where
 N: Into<&'a str>,
 V: ToValue,

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pub fn set_property_from_value<'a, N>(
 &self,
 property_name: N,
 value: &Value
) -> Result<(), BoolError> where
 N: Into<&'a str>,

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pub fn set_properties(
&self,
property_values: &[(&str, &dyn ToValue )]
) -> Result<(), BoolError>

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pub fn set_properties_from_value(
&self,
property_values: &[(&str, Value )]
) -> Result<(), BoolError>

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pub fn property<'a, N>(&self, property_name: N) -> Result<Value, BoolError> where
N: Into<&'a str>,

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pub fn has_property<'a, N>(&self, property_name: N, type_: Option<Type>) -> bool where
N: Into<&'a str>,

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pub fn property_type<'a, N>(&self, property_name: N) -> Option<Type> where
N: Into<&'a str>,

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pub fn find_property<'a, N>(&self, property_name: N) -> Option<ParamSpec> where
N: Into<&'a str>,

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pub fn list_properties(&self) -> Vec<ParamSpec, Global>

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pub fn freeze_notify(&self) -> PropertyNotificationFreezeGuard

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

Safety Read more

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

Safety Read more

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

Safety Read more

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

Safety Read more

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

Safety Read more

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

Safety Read more

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pub fn block_signal(&self, handler_id: &SignalHandlerId)

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pub fn unblock_signal(&self, handler_id: &SignalHandlerId)

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pub fn stop_signal_emission(&self, signal_name: &str)

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

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

Same as connect but takes a SignalId instead of a signal name.

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

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

Same as connect_local but takes a SignalId instead of a signal name.

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pub unsafe fn connect_unsafe<'a, N, F>(
 &self,
 signal_name: N,
 after: bool,
 callback: F
) -> Result<SignalHandlerId, BoolError> where
 N: Into<&'a str>,
 F: Fn(&[Value ]) -> Option<Value>,

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

Same as connect_unsafe but takes a SignalId instead of a signal name.

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pub fn emit(
 &self,
 signal_id: SignalId,
 args: &[&dyn ToValue ]
) -> Result<Option<Value>, BoolError>

Emit signal by signal id.

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

Same as emit but takes Value for the arguments.

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pub fn emit_by_name<'a, N>(
 &self,
 signal_name: N,
 args: &[&dyn ToValue ]
) -> Result<Option<Value>, BoolError> where
 N: Into<&'a str>,

Emit signal by its name.

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pub fn emit_by_name_with_values<'a, N>(
 &self,
 signal_name: N,
 args: &[Value ]
) -> Result<Option<Value>, BoolError> where
 N: Into<&'a str>,

Same as emit_by_name but takes Value for the arguments.

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pub fn emit_with_details(
 &self,
 signal_id: SignalId,
 details: Quark,
 args: &[&dyn ToValue ]
) -> Result<Option<Value>, BoolError>

Emit signal with details by signal id.

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

Same as emit_with_details but takes Value for the arguments.

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pub fn disconnect(&self, handler_id: SignalHandlerId)

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

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

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

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pub fn notify<'a, N>(&self, property_name: N) where
N: Into<&'a str>,

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pub fn notify_by_pspec(&self, pspec: &ParamSpec)

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

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pub fn bind_property<'a, O, N, M>(
 &'a self,
 source_property: N,
 target: &'a O,
 target_property: M
) -> BindingBuilder<'a> where
 O: ObjectType,
 N: Into<&'a str>,
 M: Into<&'a str>,

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pub fn ref_count(&self) -> u32

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

type Owned = T

The resulting type after obtaining ownership.

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pub fn to_owned(&self) -> T

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

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

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

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

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impl<T> ToSendValue for T where
T: Send + ToValue + ?Sized,

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pub fn to_send_value(&self) -> SendValue

Returns a SendValue clone of self.

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impl<T> ToString for T where
T: Display + ?Sized,

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pub default fn to_string(&self) -> String

Converts the given value to a String. Read more

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

type Error = Infallible

The type returned in the event of a conversion error.

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

Performs the conversion.

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

type Error = >::Error

The type returned in the event of a conversion error.

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pub fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

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

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Struct gdk4::Display[−][src]

Implementations

impl Display

pub fn default() -> Option<Display>

pub fn open(display_name: &str) -> Option<Display>

Trait Implementations

impl Clone for Display

fn clone(&self) -> Display

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

impl Debug for Display

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

impl Display for Display

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

impl Hash for Display

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

fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher,

impl Ord for Display

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

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

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

fn clamp(self, min: Self, max: Self) -> Self

impl ParentClassIs for Display

type Parent = Object

impl<T: ObjectType> PartialEq<T> for Display

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

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

impl<T: ObjectType> PartialOrd<T> for Display

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

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

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

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

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

impl StaticType for Display

fn static_type() -> Type

impl Eq for Display

impl StructuralEq for Display

Auto Trait Implementations

impl RefUnwindSafe for Display

impl !Send for Display

impl !Sync for Display

impl Unpin for Display

impl UnwindSafe for Display

Blanket Implementations

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

pub fn type_id(&self) -> TypeId

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

pub fn borrow(&self) -> &T

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

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

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

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

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

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

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

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

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

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

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

impl<T> From<T> for T

pub fn from(t: T) -> T

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

pub fn into(self) -> U

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

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

pub fn type_(&self) -> Type

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

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

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

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

pub fn set_property<'a, N, V>( &self, property_name: N, value: V) -> Result<(), BoolError> where N: Into<&'a str>, V: ToValue,

pub fn set_property_from_value<'a, N>( &self, property_name: N, value: &Value) -> Result<(), BoolError> where N: Into<&'a str>,

pub fn set_properties( &self, property_values: &[(&str, &dyn ToValue)]) -> Result<(), BoolError>

pub fn set_properties_from_value( &self, property_values: &[(&str, Value)]) -> Result<(), BoolError>

pub fn property<'a, N>(&self, property_name: N) -> Result<Value, BoolError> where N: Into<&'a str>,

pub fn has_property<'a, N>(&self, property_name: N, type_: Option<Type>) -> bool where N: Into<&'a str>,

pub fn property_type<'a, N>(&self, property_name: N) -> Option<Type> where N: Into<&'a str>,

pub fn find_property<'a, N>(&self, property_name: N) -> Option<ParamSpec> where N: Into<&'a str>,

pub fn list_properties(&self) -> Vec<ParamSpec, Global>

pub fn freeze_notify(&self) -> PropertyNotificationFreezeGuard

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

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

fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pub fn set_property<'a, N, V>(
&self,
property_name: N,
value: V
) -> Result<(), BoolError> where
N: Into<&'a str>,
V: ToValue,

pub fn set_property_from_value<'a, N>(
&self,
property_name: N,
value: &Value
) -> Result<(), BoolError> where
N: Into<&'a str>,

pub fn set_properties(
&self,
property_values: &[(&str, &dyn ToValue )]
) -> Result<(), BoolError>

pub fn set_properties_from_value(
&self,
property_values: &[(&str, Value )]
) -> Result<(), BoolError>

pub fn property<'a, N>(&self, property_name: N) -> Result<Value, BoolError> where
N: Into<&'a str>,

pub fn has_property<'a, N>(&self, property_name: N, type_: Option<Type>) -> bool where
N: Into<&'a str>,

pub fn property_type<'a, N>(&self, property_name: N) -> Option<Type> where
N: Into<&'a str>,

pub fn find_property<'a, N>(&self, property_name: N) -> Option<ParamSpec> where
N: Into<&'a str>,

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

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

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

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

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

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

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

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

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

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

pub unsafe fn connect_unsafe<'a, N, F>(
&self,
signal_name: N,
after: bool,
callback: F
) -> Result<SignalHandlerId, BoolError> where
N: Into<&'a str>,
F: Fn(&[Value ]) -> Option<Value>,

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

pub fn emit(
&self,
signal_id: SignalId,
args: &[&dyn ToValue ]
) -> Result<Option<Value>, BoolError>

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

pub fn emit_by_name<'a, N>(
&self,
signal_name: N,
args: &[&dyn ToValue ]
) -> Result<Option<Value>, BoolError> where
N: Into<&'a str>,

pub fn emit_by_name_with_values<'a, N>(
&self,
signal_name: N,
args: &[Value ]
) -> Result<Option<Value>, BoolError> where
N: Into<&'a str>,

pub fn emit_with_details(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue ]
) -> Result<Option<Value>, BoolError>

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

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

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

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

pub fn notify<'a, N>(&self, property_name: N) where
N: Into<&'a str>,

pub fn bind_property<'a, O, N, M>(
&'a self,
source_property: N,
target: &'a O,
target_property: M
) -> BindingBuilder<'a> where
O: ObjectType,
N: Into<&'a str>,
M: Into<&'a str>,

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

impl<T> ToSendValue for T where
T: Send + ToValue + ?Sized,

impl<T> ToString for T where
T: Display + ?Sized,

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

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

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

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