{"version":3,"file":"index.mjs","sources":["../../../../../src/render/dom/viewport/index.ts"],"sourcesContent":["import { ElementOrSelector, resolveElements } from \"motion-dom\"\n\nexport type ViewChangeHandler = (entry: IntersectionObserverEntry) => void\n\ntype MarginValue = `${number}${\"px\" | \"%\"}`\ntype MarginType =\n    | MarginValue\n    | `${MarginValue} ${MarginValue}`\n    | `${MarginValue} ${MarginValue} ${MarginValue}`\n    | `${MarginValue} ${MarginValue} ${MarginValue} ${MarginValue}`\n\nexport interface InViewOptions {\n    root?: Element | Document\n    margin?: MarginType\n    amount?: \"some\" | \"all\" | number\n}\n\nconst thresholds = {\n    some: 0,\n    all: 1,\n}\n\nexport function inView(\n    elementOrSelector: ElementOrSelector,\n    onStart: (\n        element: Element,\n        entry: IntersectionObserverEntry\n    ) => void | ViewChangeHandler,\n    { root, margin: rootMargin, amount = \"some\" }: InViewOptions = {}\n): VoidFunction {\n    const elements = resolveElements(elementOrSelector)\n\n    const activeIntersections = new WeakMap<Element, ViewChangeHandler>()\n\n    const onIntersectionChange: IntersectionObserverCallback = (entries) => {\n        entries.forEach((entry) => {\n            const onEnd = activeIntersections.get(entry.target)\n\n            /**\n             * If there's no change to the intersection, we don't need to\n             * do anything here.\n             */\n            if (entry.isIntersecting === Boolean(onEnd)) return\n\n            if (entry.isIntersecting) {\n                const newOnEnd = onStart(entry.target, entry)\n                if (typeof newOnEnd === \"function\") {\n                    activeIntersections.set(entry.target, newOnEnd)\n                } else {\n                    observer.unobserve(entry.target)\n                }\n            } else if (typeof onEnd === \"function\") {\n                onEnd(entry)\n                activeIntersections.delete(entry.target)\n            }\n        })\n    }\n\n    const observer = new IntersectionObserver(onIntersectionChange, {\n        root,\n        rootMargin,\n        threshold: typeof amount === \"number\" ? amount : thresholds[amount],\n    })\n\n    elements.forEach((element) => observer.observe(element))\n\n    return () => observer.disconnect()\n}\n"],"names":[],"mappings":";;AAiBA,MAAM,UAAU,GAAG;AACf,IAAA,IAAI,EAAE,CAAC;AACP,IAAA,GAAG,EAAE,CAAC;CACT,CAAA;SAEe,MAAM,CAClB,iBAAoC,EACpC,OAG6B,EAC7B,EAAE,IAAI,EAAE,MAAM,EAAE,UAAU,EAAE,MAAM,GAAG,MAAM,KAAoB,EAAE,EAAA;AAEjE,IAAA,MAAM,QAAQ,GAAG,eAAe,CAAC,iBAAiB,CAAC,CAAA;AAEnD,IAAA,MAAM,mBAAmB,GAAG,IAAI,OAAO,EAA8B,CAAA;AAErE,IAAA,MAAM,oBAAoB,GAAiC,CAAC,OAAO,KAAI;AACnE,QAAA,OAAO,CAAC,OAAO,CAAC,CAAC,KAAK,KAAI;YACtB,MAAM,KAAK,GAAG,mBAAmB,CAAC,GAAG,CAAC,KAAK,CAAC,MAAM,CAAC,CAAA;AAEnD;;;AAGG;AACH,YAAA,IAAI,KAAK,CAAC,cAAc,KAAK,OAAO,CAAC,KAAK,CAAC;gBAAE,OAAM;AAEnD,YAAA,IAAI,KAAK,CAAC,cAAc,EAAE;gBACtB,MAAM,QAAQ,GAAG,OAAO,CAAC,KAAK,CAAC,MAAM,EAAE,KAAK,CAAC,CAAA;AAC7C,gBAAA,IAAI,OAAO,QAAQ,KAAK,UAAU,EAAE;oBAChC,mBAAmB,CAAC,GAAG,CAAC,KAAK,CAAC,MAAM,EAAE,QAAQ,CAAC,CAAA;iBAClD;qBAAM;AACH,oBAAA,QAAQ,CAAC,SAAS,CAAC,KAAK,CAAC,MAAM,CAAC,CAAA;iBACnC;aACJ;AAAM,iBAAA,IAAI,OAAO,KAAK,KAAK,UAAU,EAAE;gBACpC,KAAK,CAAC,KAAK,CAAC,CAAA;AACZ,gBAAA,mBAAmB,CAAC,MAAM,CAAC,KAAK,CAAC,MAAM,CAAC,CAAA;aAC3C;AACL,SAAC,CAAC,CAAA;AACN,KAAC,CAAA;AAED,IAAA,MAAM,QAAQ,GAAG,IAAI,oBAAoB,CAAC,oBAAoB,EAAE;QAC5D,IAAI;QACJ,UAAU;AACV,QAAA,SAAS,EAAE,OAAO,MAAM,KAAK,QAAQ,GAAG,MAAM,GAAG,UAAU,CAAC,MAAM,CAAC;AACtE,KAAA,CAAC,CAAA;AAEF,IAAA,QAAQ,CAAC,OAAO,CAAC,CAAC,OAAO,KAAK,QAAQ,CAAC,OAAO,CAAC,OAAO,CAAC,CAAC,CAAA;AAExD,IAAA,OAAO,MAAM,QAAQ,CAAC,UAAU,EAAE,CAAA;AACtC;;;;"}