Signals and Sig

Signals is the trait the page's state struct implements, and Sig<S, T> is a typed reference to one of its fields.

Types

Item	Summary
`Signals`	A struct whose fields are signals.
`Sig`	A typed reference to a signal of type `T` inside the signal struct `S`.
`Item`	The current item of a list, inside `each` or a list predicate such as `Sig::count`.
`Root`	Marks a `Sig` whose path starts at the page's signal struct.
`Local`	Marks a `Sig` whose path starts at the current item of an `each` or a list predicate.
`Part`	A piece of page written once against its own signals, which any page can embed.
`Part::render`	Renders the part, with its paths written under the field it is embedded at.
`MAX_DEPTH`	The deepest chain of fields a `Sig` can name.

Sig

A Sig is also an expression, so the methods of Expr apply to it.

Item	Summary
`at`	The field `field` of the struct this signal holds.
`set`	A statement that assigns `value` to this signal in the browser.
`toggle`	A statement that flips this flag.
`patch`	A patch that sets this signal to `value` when the server sends it.
`path`	The dotted field path this signal is stored under.
`let_in_stmt`	A statement that runs `body` with this signal's value when the statement runs.

Lists

These exist on a Sig whose value is a Vec.

Item	Summary
`push`	A statement that appends `value` to this list.
`append`	A statement that appends every item of `items` to this list.
`prepend`	A statement that adds every item of `items` before the items of this list.
`patch_append`	A patch that adds `items` after the items the browser holds.
`patch_prepend`	A patch that adds `items` before the items the browser holds.
`patch_upsert`	A patch that replaces items by key and appends those with new keys.
`patch_remove`	A patch that removes each item whose key is one of `keys`.
`extend`	A statement that appends `count` items, building each from its position `i`.
`remove_at`	A statement that removes the item at `index`, if there is one.
`clear`	A statement that empties this list.
`retain`	A statement that keeps only the items for which `keep` is true.
`set_all`	A statement that sets `field` to `value` on every item.
`update_where`	A statement that sets `field` to `value` on the items for which `when` is true.
`swap`	A statement that exchanges the items at `a` and `b`, if both exist.
`sort_by`	A statement that orders the items by `key`, ascending, keeping the order of equal keys.
`sort_by_desc`	A statement that orders the items by `key`, descending, keeping the order of equal keys.
`count`	The number of items for which `matches` is true.
`map`	The list of what `value` gives for each item, in order.
`sum_of`	The sum of `value` over the items, 0 for an empty list.
`max_of`	The largest `value` over the items, or `None` for an empty list.
`min_of`	The smallest `value` over the items, or `None` for an empty list.

Item

Item	Summary
`at`	The field `field` of the item.
`value`	The item itself, as a signal that can be read and written.
`index`	The item's position in its list, starting at 0.
`remove`	A statement that removes this item from its list.