Introduced a builder pattern interface (#275)

Author: simongarnier

Cargo.toml

@@ -43,6 +43,7 @@ default = [
     "calc",
     "content_size",
     "detailed_layout_info",
+    "builder"
 ]
 #! ## Feature Flags
 #!
@@ -62,6 +63,8 @@ content_size = []
 detailed_layout_info = []
 ## Use strict provenance APIs for pointer manipulation. Using this feature requires Rust 1.84 or higher.
 strict_provenance = []
+## Expose a builder pattern interface to construct layout tree
+builder = ["alloc"]
 
 #! ### Taffy Tree
 

src/lib.rs

@@ -109,6 +109,9 @@ pub use crate::compute::{
 };
 #[doc(inline)]
 pub use crate::style::Style;
+#[cfg(feature = "builder")]
+#[doc(inline)]
+pub use crate::style::StyleBuilder;
 #[doc(inline)]
 pub use crate::tree::traits::*;
 #[cfg(feature = "taffy_tree")]

src/prelude.rs

@@ -28,3 +28,6 @@ pub use crate::style_helpers::{
 
 #[cfg(feature = "taffy_tree")]
 pub use crate::TaffyTree;
+
+#[cfg(feature = "builder")]
+pub use crate::style::{NodeIdRef, StyleBuilder};