Struct gtk4::Constraint

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pub struct Constraint { /* private fields */ }
Expand description

Constraint describes a constraint between attributes of two widgets, expressed as a linear equation.

The typical equation for a constraint is:

  target.target_attr = source.source_attr × multiplier + constant

Each Constraint is part of a system that will be solved by a ConstraintLayout in order to allocate and position each child widget or guide.

The source and target, as well as their attributes, of a Constraint instance are immutable after creation.

§Properties

§constant

The constant value to be added to the source-attribute.

Readable | Writeable | Construct Only

§multiplier

The multiplication factor to be applied to the source-attribute.

Readable | Writeable | Construct Only

§relation

The order relation between the terms of the constraint.

Readable | Writeable | Construct Only

§source

The source of the constraint.

The constraint will set the target-attribute property of the target using the source-attribute property of the source.

Readable | Writeable | Construct Only

§source-attribute

The attribute of the source read by the constraint.

Readable | Writeable | Construct Only

§strength

The strength of the constraint.

The strength can be expressed either using one of the symbolic values of the ConstraintStrength enumeration, or any positive integer value.

Readable | Writeable | Construct Only

§target

The target of the constraint.

The constraint will set the target-attribute property of the target using the source-attribute property of the source widget.

Readable | Writeable | Construct Only

§target-attribute

The attribute of the target set by the constraint.

Readable | Writeable | Construct Only

§Implements

[trait@glib::ObjectExt]

Implementations§

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impl Constraint

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pub fn new( target: Option<&impl IsA<ConstraintTarget>>, target_attribute: ConstraintAttribute, relation: ConstraintRelation, source: Option<&impl IsA<ConstraintTarget>>, source_attribute: ConstraintAttribute, multiplier: f64, constant: f64, strength: i32 ) -> Constraint

Creates a new constraint representing a relation between a layout attribute on a source and a layout attribute on a target.

§target

the target of the constraint

§target_attribute

the attribute of target to be set

§relation

the relation equivalence between target_attribute and source_attribute

§source

the source of the constraint

§source_attribute

the attribute of source to be read

§multiplier

a multiplication factor to be applied to source_attribute

§constant

a constant factor to be added to source_attribute

§strength

the strength of the constraint

§Returns

the newly created constraint

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pub fn new_constant( target: Option<&impl IsA<ConstraintTarget>>, target_attribute: ConstraintAttribute, relation: ConstraintRelation, constant: f64, strength: i32 ) -> Constraint

Creates a new constraint representing a relation between a layout attribute on a target and a constant value.

§target

a the target of the constraint

§target_attribute

the attribute of target to be set

§relation

the relation equivalence between target_attribute and constant

§constant

a constant factor to be set on target_attribute

§strength

the strength of the constraint

§Returns

the newly created constraint

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pub fn builder() -> ConstraintBuilder

Creates a new builder-pattern struct instance to construct Constraint objects.

This method returns an instance of ConstraintBuilder which can be used to create Constraint objects.

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pub fn constant(&self) -> f64

Retrieves the constant factor added to the source attributes’ value.

§Returns

a constant factor

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pub fn multiplier(&self) -> f64

Retrieves the multiplication factor applied to the source attribute’s value.

§Returns

a multiplication factor

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pub fn relation(&self) -> ConstraintRelation

The order relation between the terms of the constraint.

§Returns

a relation type

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pub fn source(&self) -> Option<ConstraintTarget>

Retrieves the ConstraintTarget used as the source for the constraint.

If the source is set to NULL at creation, the constraint will use the widget using the ConstraintLayout as the source.

§Returns

the source of the constraint

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pub fn source_attribute(&self) -> ConstraintAttribute

Retrieves the attribute of the source to be read by the constraint.

§Returns

the source’s attribute

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pub fn strength(&self) -> i32

Retrieves the strength of the constraint.

§Returns

the strength value

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pub fn target(&self) -> Option<ConstraintTarget>

Retrieves the ConstraintTarget used as the target for the constraint.

If the targe is set to NULL at creation, the constraint will use the widget using the ConstraintLayout as the target.

§Returns

a ConstraintTarget

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pub fn target_attribute(&self) -> ConstraintAttribute

Retrieves the attribute of the target to be set by the constraint.

§Returns

the target’s attribute

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pub fn is_attached(&self) -> bool

Checks whether the constraint is attached to a ConstraintLayout, and it is contributing to the layout.

§Returns

TRUE if the constraint is attached

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pub fn is_constant(&self) -> bool

Checks whether the constraint describes a relation between an attribute on the target and a constant value.

§Returns

TRUE if the constraint is a constant relation

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pub fn is_required(&self) -> bool

Checks whether the constraint is a required relation for solving the constraint layout.

§Returns

true if the constraint is required

Trait Implementations§

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impl Clone for Constraint

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fn clone(&self) -> Self

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 Constraint

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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 Default for Constraint

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl HasParamSpec for Constraint

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type ParamSpec = ParamSpecObject

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type SetValue = Constraint

Preferred value to be used as setter for the associated ParamSpec.
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type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, Constraint>

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fn param_spec_builder() -> Self::BuilderFn

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impl Hash for Constraint

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

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 Ord for Constraint

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

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl ParentClassIs for Constraint

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

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

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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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
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fn gt(&self, other: &Rhs) -> bool

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

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fn static_type() -> Type

Returns the type identifier of Self.
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impl Eq for Constraint

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Tries to downcast to a subclass or interface implementor T. Read more
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Tries to downcast to a reference of its subclass or interface implementor T. Read more
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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
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impl<O> GObjectPropertyExpressionExt for O
where O: IsA<Object>,

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

Create an expression looking up an object’s property.
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fn property_expression_weak(&self, property_name: &str) -> PropertyExpression

Create an expression looking up an object’s property with a weak reference.
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Create an expression looking up a property in the bound this object.
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impl<T, U> Into<U> for T
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fn into(self) -> U

Calls U::from(self).

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Returns the class of the object.
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Sets the property property_name of the object to value value. Read more
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fn set_property_from_value(&self, property_name: &str, value: &Value)

Sets the property property_name of the object to value value. Read more
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fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])

Sets multiple properties of the object at once. Read more
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Sets multiple properties of the object at once. Read more
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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
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Gets the property property_name of the object. Read more
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Check if the object has a property property_name of the given type_. Read more
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Get the type of the property property_name of this object. Read more
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fn find_property(&self, property_name: &str) -> Option<ParamSpec>

Get the ParamSpec of the property property_name of this object.
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Return all ParamSpec of the properties of this object.
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Freeze all property notifications until the return guard object is dropped. Read more
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Retrieve previously set arbitrary data of this object with the given key. Read more
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Block a given signal handler. Read more
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Unblock a given signal handler.
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Stop emission of the currently emitted signal.
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Stop emission of the currently emitted signal by the (possibly detailed) signal name.
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Connect to the signal signal_name on this object. Read more
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Connect to the signal signal_id on this object. Read more
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Connect to the signal signal_name on this object. Read more
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unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerId
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Connect to the signal signal_id on this object. Read more
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Connect a closure to the signal signal_name on this object. Read more
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Connect a closure to the signal signal_id on this object. Read more
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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.
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fn disconnect(&self, handler_id: SignalHandlerId)

Disconnect a previously connected signal handler.
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fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
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Connect to the notify signal of the object. Read more
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Connect to the notify signal of the object. Read more
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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
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fn notify(&self, property_name: &str)

Notify that the given property has changed its value. Read more
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fn notify_by_pspec(&self, pspec: &ParamSpec)

Notify that the given property has changed its value. Read more
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fn downgrade(&self) -> WeakRef<T>

Downgrade this object to a weak reference.
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fn add_weak_ref_notify<F>(&self, f: F) -> WeakRefNotify<T>
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Add a callback to be notified when the Object is disposed.
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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
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fn ref_count(&self) -> u32

Returns the strong reference count of this object.
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unsafe fn run_dispose(&self)

Runs the dispose mechanism of the object. Read more
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impl<T> Property for T
where T: HasParamSpec,

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type Value = T

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impl<T> PropertyGet for T
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type Value = T

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fn get<R, F>(&self, f: F) -> R
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fn ensure_type()

Ensures that the type has been registered with the type system.
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The resulting type after obtaining ownership.
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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> TransparentType for T

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

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

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