@wordpress/block-editor/build-module/components/block-draggable/use-scroll-when-dragging.mjs.map

Generic block editor.

{
  "version": 3,
  "sources": ["../../../src/components/block-draggable/use-scroll-when-dragging.js"],
  "sourcesContent": ["/**\n * WordPress dependencies\n */\nimport { getScrollContainer } from '@wordpress/dom';\nimport { useCallback, useEffect, useRef } from '@wordpress/element';\n\nconst SCROLL_INACTIVE_DISTANCE_PX = 50;\nconst SCROLL_INTERVAL_MS = 25;\nconst PIXELS_PER_SECOND_PER_PERCENTAGE = 1000;\nconst VELOCITY_MULTIPLIER =\n\tPIXELS_PER_SECOND_PER_PERCENTAGE * ( SCROLL_INTERVAL_MS / 1000 );\n\n/**\n * React hook that scrolls the scroll container when a block is being dragged.\n *\n * @return {Function[]} `startScrolling`, `scrollOnDragOver`, `stopScrolling`\n *                      functions to be called in `onDragStart`, `onDragOver`\n *                      and `onDragEnd` events respectively.\n */\nexport default function useScrollWhenDragging() {\n\tconst dragStartYRef = useRef( null );\n\tconst velocityYRef = useRef( null );\n\tconst scrollParentYRef = useRef( null );\n\tconst scrollEditorIntervalRef = useRef( null );\n\n\t// Clear interval when unmounting.\n\tuseEffect(\n\t\t() => () => {\n\t\t\tif ( scrollEditorIntervalRef.current ) {\n\t\t\t\tclearInterval( scrollEditorIntervalRef.current );\n\t\t\t\tscrollEditorIntervalRef.current = null;\n\t\t\t}\n\t\t},\n\t\t[]\n\t);\n\n\tconst startScrolling = useCallback( ( event ) => {\n\t\tdragStartYRef.current = event.clientY;\n\n\t\t// Find nearest parent(s) to scroll.\n\t\tscrollParentYRef.current = getScrollContainer( event.target );\n\n\t\tscrollEditorIntervalRef.current = setInterval( () => {\n\t\t\tif ( scrollParentYRef.current && velocityYRef.current ) {\n\t\t\t\tconst newTop =\n\t\t\t\t\tscrollParentYRef.current.scrollTop + velocityYRef.current;\n\n\t\t\t\t// Setting `behavior: 'smooth'` as a scroll property seems to hurt performance.\n\t\t\t\t// Better to use a small scroll interval.\n\t\t\t\tscrollParentYRef.current.scroll( {\n\t\t\t\t\ttop: newTop,\n\t\t\t\t} );\n\t\t\t}\n\t\t}, SCROLL_INTERVAL_MS );\n\t}, [] );\n\n\tconst scrollOnDragOver = useCallback( ( event ) => {\n\t\tif ( ! scrollParentYRef.current ) {\n\t\t\treturn;\n\t\t}\n\t\tconst scrollParentHeight = scrollParentYRef.current.offsetHeight;\n\t\tconst offsetDragStartPosition =\n\t\t\tdragStartYRef.current - scrollParentYRef.current.offsetTop;\n\t\tconst offsetDragPosition =\n\t\t\tevent.clientY - scrollParentYRef.current.offsetTop;\n\n\t\tif ( event.clientY > offsetDragStartPosition ) {\n\t\t\t// User is dragging downwards.\n\t\t\tconst moveableDistance = Math.max(\n\t\t\t\tscrollParentHeight -\n\t\t\t\t\toffsetDragStartPosition -\n\t\t\t\t\tSCROLL_INACTIVE_DISTANCE_PX,\n\t\t\t\t0\n\t\t\t);\n\t\t\tconst dragDistance = Math.max(\n\t\t\t\toffsetDragPosition -\n\t\t\t\t\toffsetDragStartPosition -\n\t\t\t\t\tSCROLL_INACTIVE_DISTANCE_PX,\n\t\t\t\t0\n\t\t\t);\n\t\t\tconst distancePercentage =\n\t\t\t\tmoveableDistance === 0 || dragDistance === 0\n\t\t\t\t\t? 0\n\t\t\t\t\t: dragDistance / moveableDistance;\n\t\t\tvelocityYRef.current = VELOCITY_MULTIPLIER * distancePercentage;\n\t\t} else if ( event.clientY < offsetDragStartPosition ) {\n\t\t\t// User is dragging upwards.\n\t\t\tconst moveableDistance = Math.max(\n\t\t\t\toffsetDragStartPosition - SCROLL_INACTIVE_DISTANCE_PX,\n\t\t\t\t0\n\t\t\t);\n\t\t\tconst dragDistance = Math.max(\n\t\t\t\toffsetDragStartPosition -\n\t\t\t\t\toffsetDragPosition -\n\t\t\t\t\tSCROLL_INACTIVE_DISTANCE_PX,\n\t\t\t\t0\n\t\t\t);\n\t\t\tconst distancePercentage =\n\t\t\t\tmoveableDistance === 0 || dragDistance === 0\n\t\t\t\t\t? 0\n\t\t\t\t\t: dragDistance / moveableDistance;\n\t\t\tvelocityYRef.current = -VELOCITY_MULTIPLIER * distancePercentage;\n\t\t} else {\n\t\t\tvelocityYRef.current = 0;\n\t\t}\n\t}, [] );\n\n\tconst stopScrolling = () => {\n\t\tdragStartYRef.current = null;\n\t\tscrollParentYRef.current = null;\n\n\t\tif ( scrollEditorIntervalRef.current ) {\n\t\t\tclearInterval( scrollEditorIntervalRef.current );\n\t\t\tscrollEditorIntervalRef.current = null;\n\t\t}\n\t};\n\n\treturn [ startScrolling, scrollOnDragOver, stopScrolling ];\n}\n"],
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