Struct gtk4::ConstraintGuide [−][src]
pub struct ConstraintGuide(_);Expand description
A ConstraintGuide is an invisible layout element in a
ConstraintLayout.
The ConstraintLayout treats guides like widgets. They
can be used as the source or target of a Constraint.
Guides have a minimum, maximum and natural size. Depending on the constraints that are applied, they can act like a guideline that widgets can be aligned to, or like flexible space.
Unlike a Widget, a ConstraintGuide will not be drawn.
Implements
Implementations
Creates a new builder-pattern struct instance to construct ConstraintGuide objects.
This method returns an instance of ConstraintGuideBuilder which can be used to create ConstraintGuide objects.
Retrieves the strength set using set_strength().
Returns
the strength of the constraint on the natural size
Sets the maximum size of self.
If self is attached to a ConstraintLayout,
the constraints will be updated to reflect the new size.
width
the new maximum width, or -1 to not change it
height
the new maximum height, or -1 to not change it
Sets the minimum size of self.
If self is attached to a ConstraintLayout,
the constraints will be updated to reflect the new size.
width
the new minimum width, or -1 to not change it
height
the new minimum height, or -1 to not change it
Sets a name for the given ConstraintGuide.
The name is useful for debugging purposes.
name
a name for the self
Sets the natural size of self.
If self is attached to a ConstraintLayout,
the constraints will be updated to reflect the new size.
width
the new natural width, or -1 to not change it
height
the new natural height, or -1 to not change it
Sets the strength of the constraint on the natural size of the
given ConstraintGuide.
strength
the strength of the constraint
The maximum height of the guide.
The maximum height of the guide.
The maximum width of the guide.
The minimum height of the guide.
The minimum height of the guide.
The minimum width of the guide.
The preferred, or natural, height of the guide.
The preferred, or natural, height of the guide.
The preferred, or natural, width of the guide.
Trait Implementations
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <=
operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
Returns the type identifier of Self.
Auto Trait Implementations
impl RefUnwindSafe for ConstraintGuide
impl !Send for ConstraintGuide
impl !Sync for ConstraintGuide
impl Unpin for ConstraintGuide
impl UnwindSafe for ConstraintGuide
Blanket Implementations
Mutably borrows from an owned value. Read more
Upcasts an object to a superclass or interface T. Read more
Upcasts an object to a reference of its superclass or interface T. Read more
Tries to downcast to a subclass or interface implementor T. Read more
Tries to downcast to a reference of its subclass or interface implementor T. Read more
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
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
Casts to T unconditionally. Read more
Casts to &T unconditionally. Read more
Returns true if the object is an instance of (can be cast to) T.
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_from_value(
&self,
property_values: &[(&str, Value)]
) -> Result<(), BoolError>
pub fn has_property<'a, N>(&self, property_name: N, type_: Option<Type>) -> bool where
N: Into<&'a str>,
pub fn find_property<'a, N>(&self, property_name: N) -> Option<ParamSpec> where
N: Into<&'a str>,
Safety Read more
Safety Read more
Safety Read more
Safety Read more
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,
Same as connect but takes a SignalId instead of a signal name.
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>,
Same as connect_local but takes a SignalId instead of a signal name.
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>,
Same as connect_unsafe but takes a SignalId instead of a signal name.
Emit signal by signal id.
Same as emit but takes Value for the arguments.
Emit signal by its name.
Same as emit_by_name but takes Value for the arguments.
Emit signal with details by signal id.
Same as emit_with_details but takes Value for the arguments.
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 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>,
Returns a SendValue clone of self.