gtk4/auto/constraint.rs
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// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT
use crate::{ffi, ConstraintAttribute, ConstraintRelation, ConstraintTarget};
use glib::{prelude::*, translate::*};
glib::wrapper! {
/// [`Constraint`][crate::Constraint] describes a constraint between attributes of two widgets,
/// expressed as a linear equation.
///
/// The typical equation for a constraint is:
///
/// ```text
/// target.target_attr = source.source_attr × multiplier + constant
/// ```
///
/// Each [`Constraint`][crate::Constraint] is part of a system that will be solved by a
/// [`ConstraintLayout`][crate::ConstraintLayout] in order to allocate and position each
/// child widget or guide.
///
/// The source and target, as well as their attributes, of a [`Constraint`][crate::Constraint]
/// instance are immutable after creation.
///
/// ## Properties
///
///
/// #### `constant`
/// The constant value to be added to the [`source-attribute`][struct@crate::Constraint#source-attribute].
///
/// Readable | Writeable | Construct Only
///
///
/// #### `multiplier`
/// The multiplication factor to be applied to
/// the [`source-attribute`][struct@crate::Constraint#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`][struct@crate::Constraint#target-attribute]
/// property of the target using the [`source-attribute`][struct@crate::Constraint#source-attribute]
/// property of the source.
///
/// Readable | Writeable | Construct Only
///
///
/// #### `source-attribute`
/// The attribute of the [`source`][struct@crate::Constraint#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`][crate::ConstraintStrength] enumeration, or any positive integer
/// value.
///
/// Readable | Writeable | Construct Only
///
///
/// #### `target`
/// The target of the constraint.
///
/// The constraint will set the [`target-attribute`][struct@crate::Constraint#target-attribute]
/// property of the target using the [`source-attribute`][struct@crate::Constraint#source-attribute]
/// property of the source widget.
///
/// Readable | Writeable | Construct Only
///
///
/// #### `target-attribute`
/// The attribute of the [`target`][struct@crate::Constraint#target] set by the constraint.
///
/// Readable | Writeable | Construct Only
///
/// # Implements
///
/// [`trait@glib::ObjectExt`]
#[doc(alias = "GtkConstraint")]
pub struct Constraint(Object<ffi::GtkConstraint, ffi::GtkConstraintClass>);
match fn {
type_ => || ffi::gtk_constraint_get_type(),
}
}
impl 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
#[doc(alias = "gtk_constraint_new")]
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 {
assert_initialized_main_thread!();
unsafe {
from_glib_full(ffi::gtk_constraint_new(
target.map(|p| p.as_ref()).to_glib_none().0,
target_attribute.into_glib(),
relation.into_glib(),
source.map(|p| p.as_ref()).to_glib_none().0,
source_attribute.into_glib(),
multiplier,
constant,
strength,
))
}
}
/// 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
#[doc(alias = "gtk_constraint_new_constant")]
pub fn new_constant(
target: Option<&impl IsA<ConstraintTarget>>,
target_attribute: ConstraintAttribute,
relation: ConstraintRelation,
constant: f64,
strength: i32,
) -> Constraint {
assert_initialized_main_thread!();
unsafe {
from_glib_full(ffi::gtk_constraint_new_constant(
target.map(|p| p.as_ref()).to_glib_none().0,
target_attribute.into_glib(),
relation.into_glib(),
constant,
strength,
))
}
}
// rustdoc-stripper-ignore-next
/// Creates a new builder-pattern struct instance to construct [`Constraint`] objects.
///
/// This method returns an instance of [`ConstraintBuilder`](crate::builders::ConstraintBuilder) which can be used to create [`Constraint`] objects.
pub fn builder() -> ConstraintBuilder {
ConstraintBuilder::new()
}
/// Retrieves the constant factor added to the source attributes' value.
///
/// # Returns
///
/// a constant factor
#[doc(alias = "gtk_constraint_get_constant")]
#[doc(alias = "get_constant")]
pub fn constant(&self) -> f64 {
unsafe { ffi::gtk_constraint_get_constant(self.to_glib_none().0) }
}
/// Retrieves the multiplication factor applied to the source
/// attribute's value.
///
/// # Returns
///
/// a multiplication factor
#[doc(alias = "gtk_constraint_get_multiplier")]
#[doc(alias = "get_multiplier")]
pub fn multiplier(&self) -> f64 {
unsafe { ffi::gtk_constraint_get_multiplier(self.to_glib_none().0) }
}
/// The order relation between the terms of the constraint.
///
/// # Returns
///
/// a relation type
#[doc(alias = "gtk_constraint_get_relation")]
#[doc(alias = "get_relation")]
pub fn relation(&self) -> ConstraintRelation {
unsafe { from_glib(ffi::gtk_constraint_get_relation(self.to_glib_none().0)) }
}
/// Retrieves the [`ConstraintTarget`][crate::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`][crate::ConstraintLayout] as the source.
///
/// # Returns
///
/// the source of the constraint
#[doc(alias = "gtk_constraint_get_source")]
#[doc(alias = "get_source")]
pub fn source(&self) -> Option<ConstraintTarget> {
unsafe { from_glib_none(ffi::gtk_constraint_get_source(self.to_glib_none().0)) }
}
/// Retrieves the attribute of the source to be read by the constraint.
///
/// # Returns
///
/// the source's attribute
#[doc(alias = "gtk_constraint_get_source_attribute")]
#[doc(alias = "get_source_attribute")]
#[doc(alias = "source-attribute")]
pub fn source_attribute(&self) -> ConstraintAttribute {
unsafe {
from_glib(ffi::gtk_constraint_get_source_attribute(
self.to_glib_none().0,
))
}
}
/// Retrieves the strength of the constraint.
///
/// # Returns
///
/// the strength value
#[doc(alias = "gtk_constraint_get_strength")]
#[doc(alias = "get_strength")]
pub fn strength(&self) -> i32 {
unsafe { ffi::gtk_constraint_get_strength(self.to_glib_none().0) }
}
/// Retrieves the [`ConstraintTarget`][crate::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`][crate::ConstraintLayout] as the target.
///
/// # Returns
///
/// a [`ConstraintTarget`][crate::ConstraintTarget]
#[doc(alias = "gtk_constraint_get_target")]
#[doc(alias = "get_target")]
pub fn target(&self) -> Option<ConstraintTarget> {
unsafe { from_glib_none(ffi::gtk_constraint_get_target(self.to_glib_none().0)) }
}
/// Retrieves the attribute of the target to be set by the constraint.
///
/// # Returns
///
/// the target's attribute
#[doc(alias = "gtk_constraint_get_target_attribute")]
#[doc(alias = "get_target_attribute")]
#[doc(alias = "target-attribute")]
pub fn target_attribute(&self) -> ConstraintAttribute {
unsafe {
from_glib(ffi::gtk_constraint_get_target_attribute(
self.to_glib_none().0,
))
}
}
/// Checks whether the constraint is attached to a [`ConstraintLayout`][crate::ConstraintLayout],
/// and it is contributing to the layout.
///
/// # Returns
///
/// `TRUE` if the constraint is attached
#[doc(alias = "gtk_constraint_is_attached")]
pub fn is_attached(&self) -> bool {
unsafe { from_glib(ffi::gtk_constraint_is_attached(self.to_glib_none().0)) }
}
/// Checks whether the constraint describes a relation between an attribute
/// on the [`target`][struct@crate::Constraint#target] and a constant value.
///
/// # Returns
///
/// `TRUE` if the constraint is a constant relation
#[doc(alias = "gtk_constraint_is_constant")]
pub fn is_constant(&self) -> bool {
unsafe { from_glib(ffi::gtk_constraint_is_constant(self.to_glib_none().0)) }
}
/// Checks whether the constraint is a required relation for solving the
/// constraint layout.
///
/// # Returns
///
/// [`true`] if the constraint is required
#[doc(alias = "gtk_constraint_is_required")]
pub fn is_required(&self) -> bool {
unsafe { from_glib(ffi::gtk_constraint_is_required(self.to_glib_none().0)) }
}
}
impl Default for Constraint {
fn default() -> Self {
glib::object::Object::new::<Self>()
}
}
// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`Constraint`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
#[must_use = "The builder must be built to be used"]
pub struct ConstraintBuilder {
builder: glib::object::ObjectBuilder<'static, Constraint>,
}
impl ConstraintBuilder {
fn new() -> Self {
Self {
builder: glib::object::Object::builder(),
}
}
/// The constant value to be added to the [`source-attribute`][struct@crate::Constraint#source-attribute].
pub fn constant(self, constant: f64) -> Self {
Self {
builder: self.builder.property("constant", constant),
}
}
/// The multiplication factor to be applied to
/// the [`source-attribute`][struct@crate::Constraint#source-attribute].
pub fn multiplier(self, multiplier: f64) -> Self {
Self {
builder: self.builder.property("multiplier", multiplier),
}
}
/// The order relation between the terms of the constraint.
pub fn relation(self, relation: ConstraintRelation) -> Self {
Self {
builder: self.builder.property("relation", relation),
}
}
/// The source of the constraint.
///
/// The constraint will set the [`target-attribute`][struct@crate::Constraint#target-attribute]
/// property of the target using the [`source-attribute`][struct@crate::Constraint#source-attribute]
/// property of the source.
pub fn source(self, source: &impl IsA<ConstraintTarget>) -> Self {
Self {
builder: self.builder.property("source", source.clone().upcast()),
}
}
/// The attribute of the [`source`][struct@crate::Constraint#source] read by the
/// constraint.
pub fn source_attribute(self, source_attribute: ConstraintAttribute) -> Self {
Self {
builder: self.builder.property("source-attribute", source_attribute),
}
}
/// The strength of the constraint.
///
/// The strength can be expressed either using one of the symbolic values
/// of the [`ConstraintStrength`][crate::ConstraintStrength] enumeration, or any positive integer
/// value.
pub fn strength(self, strength: i32) -> Self {
Self {
builder: self.builder.property("strength", strength),
}
}
/// The target of the constraint.
///
/// The constraint will set the [`target-attribute`][struct@crate::Constraint#target-attribute]
/// property of the target using the [`source-attribute`][struct@crate::Constraint#source-attribute]
/// property of the source widget.
pub fn target(self, target: &impl IsA<ConstraintTarget>) -> Self {
Self {
builder: self.builder.property("target", target.clone().upcast()),
}
}
/// The attribute of the [`target`][struct@crate::Constraint#target] set by the constraint.
pub fn target_attribute(self, target_attribute: ConstraintAttribute) -> Self {
Self {
builder: self.builder.property("target-attribute", target_attribute),
}
}
// rustdoc-stripper-ignore-next
/// Build the [`Constraint`].
#[must_use = "Building the object from the builder is usually expensive and is not expected to have side effects"]
pub fn build(self) -> Constraint {
assert_initialized_main_thread!();
self.builder.build()
}
}