The ctx! macro is a special name that use to share the BuildCtx between
macros.
The fn_widget is a macro that create a widget from a function widget from
a expression. Its syntax is extended from rust syntax, you can use @ and
$ in the expression, the @ is a short hand of rdl macro, and $name
use to expression a state reference of name.
macro map a write to another state write. For example,
map_writer!($label.visible); will return a writer of bool that is
partial of the Visibility. This macros is a convenient way for
StateWriter::map_writer
pipe macro use to create Pipe object that continuous trace the
expression modify. Use the $ mark the state reference and auto subscribe
to its modify.
A macro use to declare an object. This macro will use ctx!() to access
the BuildCtx, so it can only use in a scope that has a BuildCtx named as
ctx!().
This macro just return the input token stream. It’s do nothing but help
ribir mark that a macro has been expanded.
macro split a new writer from a state writer. For example,
split_writer!($label.visible); will return a writer of bool that is
partial of the Visibility. This macros is a convenient way for
StateWriter::split_writer
watch! macro use to convert a expression to a Observable stream. Use the
$ mark the state reference and auto subscribe to its modify.