Struct gtk4::ConstantExpression
source · pub struct ConstantExpression { /* private fields */ }
Implementations§
source§impl ConstantExpression
impl ConstantExpression
sourcepub fn as_ptr(&self) -> *mut GtkConstantExpression
pub fn as_ptr(&self) -> *mut GtkConstantExpression
Return the inner pointer to the underlying C value.
sourcepub unsafe fn from_glib_ptr_borrow<'a>(
ptr: *const *const GtkConstantExpression
) -> &'a Self
pub unsafe fn from_glib_ptr_borrow<'a>( ptr: *const *const GtkConstantExpression ) -> &'a Self
Borrows the underlying C value.
source§impl ConstantExpression
impl ConstantExpression
pub fn upcast(self) -> Expression
pub fn upcast_ref(&self) -> &Expression
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 ConstantExpression
impl AsRef<Expression> for ConstantExpression
source§fn as_ref(&self) -> &Expression
fn as_ref(&self) -> &Expression
source§impl Clone for ConstantExpression
impl Clone for ConstantExpression
source§impl Debug for ConstantExpression
impl Debug for ConstantExpression
source§impl Deref for ConstantExpression
impl Deref for ConstantExpression
source§impl From<ConstantExpression> for Value
impl From<ConstantExpression> for Value
source§fn from(e: ConstantExpression) -> Self
fn from(e: ConstantExpression) -> Self
source§impl<'a> FromValue<'a> for ConstantExpression
impl<'a> FromValue<'a> for ConstantExpression
§type Checker = GenericValueTypeOrNoneChecker<ConstantExpression>
type Checker = GenericValueTypeOrNoneChecker<ConstantExpression>
source§unsafe fn from_value(value: &'a Value) -> Self
unsafe fn from_value(value: &'a Value) -> Self
Value
. Read moresource§impl HasParamSpec for ConstantExpression
impl HasParamSpec for ConstantExpression
type ParamSpec = ParamSpecExpression
§type SetValue = ConstantExpression
type SetValue = ConstantExpression
type BuilderFn = for<'a> fn(_: &'a str) -> ParamSpecExpressionBuilder<'a>
fn param_spec_builder() -> Self::BuilderFn
source§impl StaticType for ConstantExpression
impl StaticType for ConstantExpression
source§fn static_type() -> Type
fn static_type() -> Type
Self
.source§impl ToValue for ConstantExpression
impl ToValue for ConstantExpression
source§impl ToValueOptional for ConstantExpression
impl ToValueOptional for ConstantExpression
source§impl ValueType for ConstantExpression
impl ValueType for ConstantExpression
§type Type = ConstantExpression
type Type = ConstantExpression
Type
from. Read more