freya_core/states/
scrollable.rsuse freya_native_core::{
exports::shipyard::Component,
node_ref::NodeView,
prelude::{
AttributeMaskBuilder,
AttributeName,
Dependancy,
NodeMaskBuilder,
State,
},
NodeId,
SendAnyMap,
};
use freya_native_core_macro::partial_derive_state;
use crate::{
custom_attributes::CustomAttributeValues,
parsing::{
ParseAttribute,
ParseError,
},
};
#[derive(Default, Clone, Debug, Component, PartialEq)]
pub struct ScrollableState {
pub node_id: NodeId,
pub scroll_x: f32,
pub scroll_y: f32,
pub scrollables: Vec<NodeId>,
}
impl ParseAttribute for ScrollableState {
fn parse_attribute(
&mut self,
attr: freya_native_core::prelude::OwnedAttributeView<CustomAttributeValues>,
) -> Result<(), ParseError> {
#[allow(clippy::single_match)]
match attr.attribute {
AttributeName::A11yRole => {
let value = attr.value.as_text().ok_or(ParseError)?;
if value == "scroll-view" {
self.scrollables.push(self.node_id);
}
}
AttributeName::A11yScrollX => {
let value = attr.value.as_text().ok_or(ParseError)?;
self.scroll_x = value.parse::<f32>().unwrap();
}
AttributeName::A11yScrollY => {
let value = attr.value.as_text().ok_or(ParseError)?;
self.scroll_y = value.parse::<f32>().unwrap();
}
_ => {}
}
Ok(())
}
}
#[partial_derive_state]
impl State<CustomAttributeValues> for ScrollableState {
type ParentDependencies = (Self,);
type ChildDependencies = ();
type NodeDependencies = ();
const NODE_MASK: NodeMaskBuilder<'static> =
NodeMaskBuilder::new().with_attrs(AttributeMaskBuilder::Some(&[
AttributeName::A11yRole,
AttributeName::A11yScrollX,
AttributeName::A11yScrollY,
]));
fn update<'a>(
&mut self,
node_view: NodeView<CustomAttributeValues>,
_node: <Self::NodeDependencies as Dependancy>::ElementBorrowed<'a>,
parent: Option<<Self::ParentDependencies as Dependancy>::ElementBorrowed<'a>>,
_children: Vec<<Self::ChildDependencies as Dependancy>::ElementBorrowed<'a>>,
_context: &SendAnyMap,
) -> bool {
let inherited_scrollable = parent.map(|(p,)| p.clone()).unwrap_or_default();
let mut scrollable_state = ScrollableState {
node_id: node_view.node_id(),
scroll_x: 0.,
scroll_y: 0.,
..inherited_scrollable
};
if let Some(attributes) = node_view.attributes() {
for attr in attributes {
scrollable_state.parse_safe(attr);
}
}
let changed = scrollable_state != *self;
*self = scrollable_state;
changed
}
}