Macro configurable 

macro_rules! configurable {
    (@impl $(#[$meta:meta])*; $view:ident, $config:ty, $axis:expr) => { ... };
    (@impl_dynamic $(#[$meta:meta])*; $view:ident, $config:ty, $stretch_fn:expr) => { ... };
    ($(#[$meta:meta])* $view:ident, $config:ty, |$param:ident| $body:expr) => { ... };
    ($(#[$meta:meta])* $view:ident, $config:ty, $axis:expr) => { ... };
    ($(#[$meta:meta])* $view:ident, $config:ty) => { ... };
}

Creates a configurable view with builder pattern methods.

This macro generates a wrapper struct and builder methods for configuring views, following the builder pattern commonly used in UI frameworks.

Usage

// Default stretch axis (None) - for content-sized views
configurable!(Button, ButtonConfig);

// With explicit stretch axis - for views that expand
configurable!(Slider, SliderConfig, StretchAxis::Horizontal);
configurable!(Color, ColorConfig, StretchAxis::Both);

// With dynamic stretch axis (closure) - for runtime-dependent behavior
configurable!(Progress, ProgressConfig, |config| match config.style {
    ProgressStyle::Linear => StretchAxis::Horizontal,
    ProgressStyle::Circular => StretchAxis::None,
});