306 lines
11 KiB
Rust
306 lines
11 KiB
Rust
use std::cmp::Ordering;
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use crate::node::Node;
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use crate::node_ref::{NodeMask, NodeView};
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use crate::passes::{resolve_passes, resolve_passes_single_threaded, AnyPass, DirtyNodeStates};
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use crate::tree::TreeView;
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use crate::{FxDashSet, RealNodeId, SendAnyMap};
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/// Join two sorted iterators
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pub(crate) fn union_ordered_iter<'a>(
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s_iter: impl Iterator<Item = &'a str>,
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o_iter: impl Iterator<Item = &'a str>,
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new_len_guess: usize,
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) -> Vec<String> {
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let mut s_peekable = s_iter.peekable();
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let mut o_peekable = o_iter.peekable();
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let mut v = Vec::with_capacity(new_len_guess);
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while let Some(s_i) = s_peekable.peek() {
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while let Some(o_i) = o_peekable.peek() {
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match o_i.cmp(s_i) {
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Ordering::Greater => {
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break;
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}
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Ordering::Less => {
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v.push(o_peekable.next().unwrap().to_string());
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}
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Ordering::Equal => {
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o_peekable.next();
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break;
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}
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}
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}
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v.push(s_peekable.next().unwrap().to_string());
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}
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for o_i in o_peekable {
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v.push(o_i.to_string());
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}
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for w in v.windows(2) {
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debug_assert!(w[1] > w[0]);
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}
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v
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}
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/// This state is derived from children. For example a node's size could be derived from the size of children.
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/// Called when the current node's node properties are modified, a child's [ChildDepState] is modified or a child is removed.
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/// Called at most once per update.
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/// ```rust
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/// # use dioxus_native_core::node_ref::NodeView;
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/// # use dioxus_native_core::state::ChildDepState;
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/// #[derive(Clone, Copy, PartialEq, Default)]
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/// struct Layout {
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/// width: u32,
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/// height: u32,
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/// }
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///
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/// impl ChildDepState for Layout {
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/// type Ctx = ();
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/// // The layout depends on the layout of the children.
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/// type DepState = (Layout,);
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/// fn reduce<'a>(
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/// &mut self,
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/// _node: NodeView,
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/// children: impl Iterator<Item = (&'a Self,)>,
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/// _ctx: &Self::Ctx,
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/// ) -> bool
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/// where
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/// Self::DepState: 'a{
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/// /// Children are layed out form left to right. The width of the parent is the sum of the widths and the max of the heights.
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/// let new = children.map(|(&c,)|c).reduce(|c1, c2| Layout{
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/// width: c1.width + c2.width,
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/// height: c1.height.max(c2.height)
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/// }).unwrap_or_default();
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/// let changed = new != *self;
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/// *self = new;
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/// changed
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/// }
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/// }
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/// ```
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pub trait ChildDepState {
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/// The context is passed to the [ChildDepState::reduce] when it is resolved.
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type Ctx;
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/// A state from each child node that this node depends on. Typically this is Self, but it could be any state that is within the state tree.
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/// Depstate must be a tuple containing any number of borrowed elements that are either [ChildDepState] or [NodeDepState].
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type DepState: ElementBorrowable;
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/// The part of a node that this state cares about. This is used to determine if the state should be updated when a node is updated.
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const NODE_MASK: NodeMask = NodeMask::NONE;
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/// Resolve the state current node's state from the state of the children, the state of the node, and some external context.
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fn reduce<'a>(
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&mut self,
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node: NodeView,
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children: impl Iterator<Item = <Self::DepState as ElementBorrowable>::ElementBorrowed<'a>>,
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ctx: &Self::Ctx,
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) -> bool
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where
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Self::DepState: 'a;
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}
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/// This state that is passed down to children. For example text properties (`<b>` `<i>` `<u>`) would be passed to children.
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/// Called when the current node's node properties are modified or a parrent's [ParentDepState] is modified.
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/// Called at most once per update.
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/// ```rust
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/// use dioxus_native_core::node_ref::{NodeMask, AttributeMask, NodeView};
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/// use dioxus_native_core::state::*;
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///
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/// #[derive(Clone, Copy, PartialEq)]
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/// struct FontSize(usize);
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///
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/// impl ParentDepState for FontSize {
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/// type Ctx = ();
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/// // The font size depends on the font size of the parent element.
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/// type DepState = (Self,);
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/// const NODE_MASK: NodeMask =
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/// NodeMask::new_with_attrs(AttributeMask::Static(&[
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/// "font-size"
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/// ]));
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/// fn reduce<'a>(
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/// &mut self,
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/// node: NodeView,
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/// parent: Option<(&'a Self,)>,
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/// ctx: &Self::Ctx,
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/// ) -> bool{
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/// let old = *self;
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/// // If the font size was set on the parent, it is passed down to the current element
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/// if let Some((parent,)) = parent {
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/// *self = *parent;
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/// }
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/// // If the current node overrides the font size, use that size insead.
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/// for attr in node.attributes().unwrap() {
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/// match attr.attribute.name.as_str() {
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/// "font-size" => {
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/// self.0 = attr.value.as_text().unwrap().parse().unwrap();
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/// }
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/// // font-size is the only attribute we specified in the mask, so it is the only one we can see
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/// _ => unreachable!(),
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/// }
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/// }
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/// old != *self
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/// }
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/// }
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/// ```
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pub trait ParentDepState {
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/// The context is passed to the [ParentDepState::reduce] when it is resolved.
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type Ctx;
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/// A state from from the parent node that this node depends on. Typically this is Self, but it could be any state that is within the state tree.
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/// Depstate must be a tuple containing any number of borrowed elements that are either [ParentDepState] or [NodeDepState].
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type DepState: ElementBorrowable;
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/// The part of a node that this state cares about. This is used to determine if the state should be updated when a node is updated.
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const NODE_MASK: NodeMask = NodeMask::NONE;
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/// Resolve the state current node's state from the state of the parent node, the state of the node, and some external context.
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fn reduce<'a>(
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&mut self,
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node: NodeView,
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parent: Option<<Self::DepState as ElementBorrowable>::ElementBorrowed<'a>>,
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ctx: &Self::Ctx,
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) -> bool;
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}
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/// This state that is upadated lazily. For example any propertys that do not effect other parts of the dom like bg-color.
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/// Called when the current node's node properties are modified or a one of its dependanices are modified.
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/// Called at most once per update.
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/// NodeDepState is the only state that can accept multiple dependancies, but only from the current node.
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/// ```rust
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/// use dioxus_native_core::node_ref::{NodeMask, AttributeMask, NodeView};
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/// use dioxus_native_core::state::*;
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///
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/// #[derive(Clone, Copy, PartialEq)]
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/// struct TabIndex(usize);
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///
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/// impl NodeDepState for TabIndex {
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/// type Ctx = ();
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/// type DepState = ();
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/// const NODE_MASK: NodeMask =
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/// NodeMask::new_with_attrs(AttributeMask::Static(&[
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/// "tabindex"
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/// ]));
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/// fn reduce(
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/// &mut self,
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/// node: NodeView,
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/// siblings: (),
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/// ctx: &(),
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/// ) -> bool {
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/// let old = self.clone();
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/// for attr in node.attributes().unwrap() {
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/// match attr.attribute.name.as_str() {
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/// "tabindex" => {
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/// self.0 = attr.value.as_text().unwrap().parse().unwrap();
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/// }
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/// // tabindex is the only attribute we specified in the mask, so it is the only one we can see
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/// _ => unreachable!(),
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/// }
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/// }
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/// old != *self
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/// }
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/// }
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/// ```
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pub trait NodeDepState {
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/// Depstate must be a tuple containing any number of borrowed elements that are either [ChildDepState], [ParentDepState] or [NodeDepState].
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type DepState: ElementBorrowable;
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/// The state passed to [NodeDepState::reduce] when it is resolved.
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type Ctx;
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/// The part of a node that this state cares about. This is used to determine if the state should be updated when a node is updated.
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const NODE_MASK: NodeMask = NodeMask::NONE;
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/// Resolve the state current node's state from the state of the sibling states, the state of the node, and some external context.
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fn reduce<'a>(
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&mut self,
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node: NodeView,
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node_state: <Self::DepState as ElementBorrowable>::ElementBorrowed<'a>,
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ctx: &Self::Ctx,
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) -> bool;
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}
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/// Do not implement this trait. It is only meant to be derived and used through [crate::real_dom::RealDom].
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pub trait State: Default + Clone + 'static {
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#[doc(hidden)]
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const PASSES: &'static [AnyPass<Node<Self>>];
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#[doc(hidden)]
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const MASKS: &'static [NodeMask];
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#[doc(hidden)]
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fn update<T: TreeView<Node<Self>> + Sync>(
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dirty: DirtyNodeStates,
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tree: &mut T,
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ctx: SendAnyMap,
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) -> FxDashSet<RealNodeId> {
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let passes = Self::PASSES.iter().collect();
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resolve_passes(tree, dirty, passes, ctx)
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}
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#[doc(hidden)]
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fn update_single_threaded<T: TreeView<Node<Self>>>(
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dirty: DirtyNodeStates,
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tree: &mut T,
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ctx: SendAnyMap,
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) -> FxDashSet<RealNodeId> {
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let passes = Self::PASSES.iter().collect();
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resolve_passes_single_threaded(tree, dirty, passes, ctx)
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}
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}
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impl ChildDepState for () {
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type Ctx = ();
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type DepState = ();
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fn reduce<'a>(&mut self, _: NodeView, _: impl Iterator<Item = ()>, _: &Self::Ctx) -> bool
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where
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Self::DepState: 'a,
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{
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false
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}
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}
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impl ParentDepState for () {
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type Ctx = ();
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type DepState = ();
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fn reduce<'a>(&mut self, _: NodeView, _: Option<()>, _: &Self::Ctx) -> bool {
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false
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}
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}
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impl NodeDepState for () {
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type DepState = ();
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type Ctx = ();
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fn reduce(&mut self, _: NodeView, _sibling: (), _: &Self::Ctx) -> bool {
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false
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}
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}
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pub trait ElementBorrowable {
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type ElementBorrowed<'a>
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where
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Self: 'a;
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fn borrow_elements(&self) -> Self::ElementBorrowed<'_>;
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}
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macro_rules! impl_element_borrowable {
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($($t:ident),*) => {
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impl< $($t),* > ElementBorrowable for ($($t,)*) {
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type ElementBorrowed<'a> = ($(&'a $t,)*) where Self: 'a;
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#[allow(clippy::unused_unit, non_snake_case)]
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fn borrow_elements<'a>(&'a self) -> Self::ElementBorrowed<'a> {
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let ($($t,)*) = self;
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($(&$t,)*)
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}
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}
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};
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}
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impl_element_borrowable!();
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impl_element_borrowable!(A);
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impl_element_borrowable!(A, B);
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impl_element_borrowable!(A, B, C);
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impl_element_borrowable!(A, B, C, D);
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impl_element_borrowable!(A, B, C, D, E);
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impl_element_borrowable!(A, B, C, D, E, F);
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impl_element_borrowable!(A, B, C, D, E, F, G);
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impl_element_borrowable!(A, B, C, D, E, F, G, H);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I, J);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I, J, K);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I, J, K, L);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I, J, K, L, M);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I, J, K, L, M, N);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I, J, K, L, M, N, O);
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impl_element_borrowable!(A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P);
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