{"version":3,"file":"useGraceArea.js","sources":["../../src/shared/useGraceArea.ts"],"sourcesContent":["import type { Ref } from 'vue'\nimport type { Side } from '@/Popper/utils'\nimport { createEventHook, refAutoReset } from '@vueuse/shared'\nimport { ref, watchEffect } from 'vue'\n\nexport function useGraceArea(triggerElement: Ref, containerElement: Ref) {\n// Reset the inTransit state if idle/scrolled.\n const isPointerInTransit = refAutoReset(false, 300)\n\n const pointerGraceArea = ref(null)\n const pointerExit = createEventHook()\n\n function handleRemoveGraceArea() {\n pointerGraceArea.value = null\n isPointerInTransit.value = false\n }\n\n function handleCreateGraceArea(event: PointerEvent, hoverTarget: HTMLElement) {\n const currentTarget = event.currentTarget as HTMLElement\n const exitPoint = { x: event.clientX, y: event.clientY }\n const exitSide = getExitSideFromRect(exitPoint, currentTarget.getBoundingClientRect())\n const paddedExitPoints = getPaddedExitPoints(exitPoint, exitSide)\n const hoverTargetPoints = getPointsFromRect(hoverTarget.getBoundingClientRect())\n const graceArea = getHull([...paddedExitPoints, ...hoverTargetPoints])\n pointerGraceArea.value = graceArea\n isPointerInTransit.value = true\n }\n\n watchEffect((cleanupFn) => {\n if (triggerElement.value && containerElement.value) {\n const handleTriggerLeave = (event: PointerEvent) => handleCreateGraceArea(event, containerElement.value!)\n const handleContentLeave = (event: PointerEvent) => handleCreateGraceArea(event, triggerElement.value!)\n\n triggerElement.value.addEventListener('pointerleave', handleTriggerLeave)\n containerElement.value.addEventListener('pointerleave', handleContentLeave)\n\n cleanupFn(() => {\n triggerElement.value?.removeEventListener('pointerleave', handleTriggerLeave)\n containerElement.value?.removeEventListener('pointerleave', handleContentLeave)\n })\n }\n })\n\n watchEffect((cleanupFn) => {\n if (pointerGraceArea.value) {\n const handleTrackPointerGrace = (event: PointerEvent) => {\n if (!pointerGraceArea.value || !(event.target instanceof HTMLElement))\n return\n\n const target = event.target\n const pointerPosition = { x: event.clientX, y: event.clientY }\n const hasEnteredTarget = triggerElement.value?.contains(target) || containerElement.value?.contains(target)\n const isPointerOutsideGraceArea = !isPointInPolygon(pointerPosition, pointerGraceArea.value)\n const isAnotherGraceAreaTrigger = !!target.closest('[data-grace-area-trigger]')\n\n if (hasEnteredTarget) {\n handleRemoveGraceArea()\n }\n else if (isPointerOutsideGraceArea || isAnotherGraceAreaTrigger) {\n handleRemoveGraceArea()\n pointerExit.trigger()\n }\n }\n triggerElement.value?.ownerDocument.addEventListener('pointermove', handleTrackPointerGrace)\n\n cleanupFn(() => triggerElement.value?.ownerDocument.removeEventListener('pointermove', handleTrackPointerGrace))\n }\n })\n\n return {\n isPointerInTransit,\n onPointerExit: pointerExit.on,\n }\n}\n\ninterface Point { x: number, y: number }\n type Polygon = Point[]\n\nfunction getExitSideFromRect(point: Point, rect: DOMRect): Side {\n const top = Math.abs(rect.top - point.y)\n const bottom = Math.abs(rect.bottom - point.y)\n const right = Math.abs(rect.right - point.x)\n const left = Math.abs(rect.left - point.x)\n\n switch (Math.min(top, bottom, right, left)) {\n case left:\n return 'left'\n case right:\n return 'right'\n case top:\n return 'top'\n case bottom:\n return 'bottom'\n default:\n throw new Error('unreachable')\n }\n}\n\nfunction getPaddedExitPoints(exitPoint: Point, exitSide: Side, padding = 5) {\n const paddedExitPoints: Point[] = []\n switch (exitSide) {\n case 'top':\n paddedExitPoints.push(\n { x: exitPoint.x - padding, y: exitPoint.y + padding },\n { x: exitPoint.x + padding, y: exitPoint.y + padding },\n )\n break\n case 'bottom':\n paddedExitPoints.push(\n { x: exitPoint.x - padding, y: exitPoint.y - padding },\n { x: exitPoint.x + padding, y: exitPoint.y - padding },\n )\n break\n case 'left':\n paddedExitPoints.push(\n { x: exitPoint.x + padding, y: exitPoint.y - padding },\n { x: exitPoint.x + padding, y: exitPoint.y + padding },\n )\n break\n case 'right':\n paddedExitPoints.push(\n { x: exitPoint.x - padding, y: exitPoint.y - padding },\n { x: exitPoint.x - padding, y: exitPoint.y + padding },\n )\n break\n }\n return paddedExitPoints\n}\n\nfunction getPointsFromRect(rect: DOMRect) {\n const { top, right, bottom, left } = rect\n return [\n { x: left, y: top },\n { x: right, y: top },\n { x: right, y: bottom },\n { x: left, y: bottom },\n ]\n}\n\n// Determine if a point is inside of a polygon.\n// Based on https://github.com/substack/point-in-polygon\nfunction isPointInPolygon(point: Point, polygon: Polygon) {\n const { x, y } = point\n let inside = false\n for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {\n const xi = polygon[i].x\n const yi = polygon[i].y\n const xj = polygon[j].x\n const yj = polygon[j].y\n\n // prettier-ignore\n const intersect = ((yi > y) !== (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi)\n if (intersect)\n inside = !inside\n }\n\n return inside\n}\n\n// Returns a new array of points representing the convex hull of the given set of points.\n// https://www.nayuki.io/page/convex-hull-algorithm\nfunction getHull

(points: Readonly>): Array

{\n const newPoints: Array

= points.slice()\n newPoints.sort((a: Point, b: Point) => {\n if (a.x < b.x)\n return -1\n else if (a.x > b.x)\n return +1\n else if (a.y < b.y)\n return -1\n else if (a.y > b.y)\n return +1\n else return 0\n })\n return getHullPresorted(newPoints)\n}\n\n// Returns the convex hull, assuming that each points[i] <= points[i + 1]. Runs in O(n) time.\nfunction getHullPresorted

(points: Readonly>): Array

{\n if (points.length <= 1)\n return points.slice()\n\n const upperHull: Array

= []\n for (let i = 0; i < points.length; i++) {\n const p = points[i]\n while (upperHull.length >= 2) {\n const q = upperHull[upperHull.length - 1]\n const r = upperHull[upperHull.length - 2]\n if ((q.x - r.x) * (p.y - r.y) >= (q.y - r.y) * (p.x - r.x))\n upperHull.pop()\n else break\n }\n upperHull.push(p)\n }\n upperHull.pop()\n\n const lowerHull: Array

= []\n for (let i = points.length - 1; i >= 0; i--) {\n const p = points[i]\n while (lowerHull.length >= 2) {\n const q = lowerHull[lowerHull.length - 1]\n const r = lowerHull[lowerHull.length - 2]\n if ((q.x - r.x) * (p.y - r.y) >= (q.y - r.y) * (p.x - r.x))\n lowerHull.pop()\n else break\n }\n lowerHull.push(p)\n }\n lowerHull.pop()\n\n if (\n upperHull.length === 1\n && lowerHull.length === 1\n && upperHull[0].x === lowerHull[0].x\n && upperHull[0].y === lowerHull[0].y\n ) {\n return upperHull\n }\n\n else {\n return upperHull.concat(lowerHull)\n 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