feat: 第一个可以用的 ink 组件抽象 (#158)

packages/@ant/ink/src/core/get-max-width.ts

@@ -0,0 +1,27 @@
+import { LayoutEdge, type LayoutNode } from './layout/node.js'
+
+/**
+ * Returns the yoga node's content width (computed width minus padding and
+ * border).
+ *
+ * Warning: can return a value WIDER than the parent container. In a
+ * column-direction flex parent, width is the cross axis — align-items:
+ * stretch never shrinks children below their intrinsic size, so the text
+ * node overflows (standard CSS behavior). Yoga measures leaf nodes in two
+ * passes: the AtMost pass determines width, the Exactly pass determines
+ * height. getComputedWidth() reflects the wider AtMost result while
+ * getComputedHeight() reflects the narrower Exactly result. Callers that
+ * use this for wrapping should clamp to actual available screen space so
+ * the rendered line count stays consistent with the layout height.
+ */
+const getMaxWidth = (yogaNode: LayoutNode): number => {
+  return (
+    yogaNode.getComputedWidth() -
+    yogaNode.getComputedPadding(LayoutEdge.Left) -
+    yogaNode.getComputedPadding(LayoutEdge.Right) -
+    yogaNode.getComputedBorder(LayoutEdge.Left) -
+    yogaNode.getComputedBorder(LayoutEdge.Right)
+  )
+}
+
+export default getMaxWidth