Struct gtk4::ClosureExpression
source · pub struct ClosureExpression { /* private fields */ }
Implementations§
source§impl ClosureExpression
impl ClosureExpression
sourcepub fn as_ptr(&self) -> *mut GtkClosureExpression
pub fn as_ptr(&self) -> *mut GtkClosureExpression
Return the inner pointer to the underlying C value.
sourcepub unsafe fn from_glib_ptr_borrow<'a>(
ptr: *const *const GtkClosureExpression
) -> &'a Self
pub unsafe fn from_glib_ptr_borrow<'a>( ptr: *const *const GtkClosureExpression ) -> &'a Self
Borrows the underlying C value.
source§impl ClosureExpression
impl ClosureExpression
pub fn upcast(self) -> Expression
pub fn upcast_ref(&self) -> &Expression
source§impl ClosureExpression
impl ClosureExpression
pub fn new<R>(
params: impl IntoIterator<Item = impl AsRef<Expression>>,
closure: RustClosure
) -> Selfwhere
R: ValueType,
pub fn with_callback<R, F>( params: impl IntoIterator<Item = impl AsRef<Expression>>, callback: F ) -> Self
Methods from Deref<Target = Expression>§
sourcepub fn as_ptr(&self) -> *mut GtkExpression
pub fn as_ptr(&self) -> *mut GtkExpression
Return the inner pointer to the underlying C value.
pub const NONE: Option<&'static Expression> = None
pub fn bind( &self, target: &impl IsA<Object>, property: &str, this_: Option<&impl IsA<Object>> ) -> ExpressionWatch
pub fn value_type(&self) -> Type
pub fn is_static(&self) -> bool
pub fn watch<P: Fn() + 'static>( &self, this_: Option<&impl IsA<Object>>, notify: P ) -> ExpressionWatch
pub fn upcast_ref(&self) -> &Self
pub fn is<E: IsExpression>(&self) -> bool
pub fn downcast_ref<E: IsExpression>(&self) -> Option<&E>
pub fn type_(&self) -> Type
pub fn evaluate(&self, this: Option<&impl IsA<Object>>) -> Option<Value>
sourcepub fn evaluate_as<V: for<'b> FromValue<'b> + 'static, T: IsA<Object>>(
&self,
this: Option<&T>
) -> Option<V>
pub fn evaluate_as<V: for<'b> FromValue<'b> + 'static, T: IsA<Object>>( &self, this: Option<&T> ) -> Option<V>
Similar to Self::evaluate
but panics if the value is of a different
type.
sourcepub fn chain_property<T: IsA<Object>>(
&self,
property_name: &str
) -> PropertyExpression
pub fn chain_property<T: IsA<Object>>( &self, property_name: &str ) -> PropertyExpression
Create a PropertyExpression
that looks up
for property_name
with self as parameter. This is useful in long
chains of Expression
s.
sourcepub fn chain_closure<R>(&self, closure: RustClosure) -> ClosureExpressionwhere
R: ValueType,
pub fn chain_closure<R>(&self, closure: RustClosure) -> ClosureExpressionwhere
R: ValueType,
Create a ClosureExpression
from a
glib::Closure
with self as the second parameter and R
as the
return type. The return type is checked at run-time and must always
be specified. This is useful in long chains of
Expression
s when using the glib::closure!
macro.
Note that the first parameter will always be the this
object bound to
the expression. If None
is passed as this
then the type of the
first parameter must be Option<glib::Object>
otherwise type
checking will panic.
use glib::{closure, Object};
use gtk::{glib, prelude::*};
let button = gtk::Button::new();
button.set_label("Hello");
let label = button
.property_expression("label")
.chain_closure::<String>(closure!(|_: Option<Object>, label: &str| {
format!("{} World", label)
}))
.evaluate_as::<String, _>(gtk::Widget::NONE);
assert_eq!(label.unwrap(), "Hello World");
sourcepub fn chain_closure_with_callback<F, R>(&self, f: F) -> ClosureExpression
pub fn chain_closure_with_callback<F, R>(&self, f: F) -> ClosureExpression
Create a ClosureExpression
with self as
the second parameter. This is useful in long chains of
Expression
s.
Trait Implementations§
source§impl AsRef<Expression> for ClosureExpression
impl AsRef<Expression> for ClosureExpression
source§fn as_ref(&self) -> &Expression
fn as_ref(&self) -> &Expression
source§impl Clone for ClosureExpression
impl Clone for ClosureExpression
source§impl Deref for ClosureExpression
impl Deref for ClosureExpression
source§impl From<ClosureExpression> for Value
impl From<ClosureExpression> for Value
source§fn from(e: ClosureExpression) -> Self
fn from(e: ClosureExpression) -> Self
source§impl<'a> FromValue<'a> for ClosureExpression
impl<'a> FromValue<'a> for ClosureExpression
§type Checker = GenericValueTypeOrNoneChecker<ClosureExpression>
type Checker = GenericValueTypeOrNoneChecker<ClosureExpression>
source§unsafe fn from_value(value: &'a Value) -> Self
unsafe fn from_value(value: &'a Value) -> Self
Value
. Read moresource§impl HasParamSpec for ClosureExpression
impl HasParamSpec for ClosureExpression
type ParamSpec = ParamSpecExpression
§type SetValue = ClosureExpression
type SetValue = ClosureExpression
type BuilderFn = for<'a> fn(_: &'a str) -> ParamSpecExpressionBuilder<'a>
fn param_spec_builder() -> Self::BuilderFn
source§impl StaticType for ClosureExpression
impl StaticType for ClosureExpression
source§fn static_type() -> Type
fn static_type() -> Type
Self
.source§impl ToValue for ClosureExpression
impl ToValue for ClosureExpression
source§impl ToValueOptional for ClosureExpression
impl ToValueOptional for ClosureExpression
source§impl ValueType for ClosureExpression
impl ValueType for ClosureExpression
§type Type = ClosureExpression
type Type = ClosureExpression
Type
from. Read more