{"version":3,"file":"useSplitter.mjs","sources":["../../../../src/components/Splitter/useSplitter.ts"],"sourcesContent":["import { css } from '@emotion/css';\nimport { clamp } from 'lodash';\nimport { useCallback, useId, useRef } from 'react';\nimport * as React from 'react';\n\nimport { GrafanaTheme2 } from '@grafana/data';\n\nimport { useStyles2 } from '../../themes';\nimport { ComponentSize } from '../../types';\nimport { DragHandlePosition, getDragStyles } from '../DragHandle/DragHandle';\n\nexport interface UseSplitterOptions {\n /**\n * The initial size of the primary pane between 0-1, defaults to 0.5\n * If `usePixels` is true, this is the initial size in pixels of the second pane.\n */\n initialSize?: number;\n direction: 'row' | 'column';\n dragPosition?: DragHandlePosition;\n usePixels?: boolean;\n /**\n * Called when ever the size of the primary pane changes\n * @param flexSize (float from 0-1)\n */\n onSizeChanged?: (flexSize: number, firstPanePixels: number, secondPanePixels: number) => void;\n onResizing?: (flexSize: number, firstPanePixels: number, secondPanePixels: number) => void;\n\n // Size of the region left of the handle indicator that is responsive to dragging. At the same time acts as a margin\n // pushing the left pane content left.\n handleSize?: ComponentSize;\n}\n\nconst PIXELS_PER_MS = 0.3 as const;\nconst VERTICAL_KEYS = new Set(['ArrowUp', 'ArrowDown']);\nconst HORIZONTAL_KEYS = new Set(['ArrowLeft', 'ArrowRight']);\n\nconst propsForDirection = {\n row: {\n dim: 'width',\n axis: 'clientX',\n min: 'minWidth',\n max: 'maxWidth',\n },\n column: {\n dim: 'height',\n axis: 'clientY',\n min: 'minHeight',\n max: 'maxHeight',\n },\n} as const;\n\nexport function useSplitter(options: UseSplitterOptions) {\n const {\n direction,\n initialSize = options.usePixels ? 300 : 0.5,\n dragPosition = 'middle',\n onResizing,\n onSizeChanged,\n usePixels,\n } = options;\n\n const handleSize = getPixelSize(options.handleSize);\n const splitterRef = useRef(null);\n const firstPaneRef = useRef(null);\n const secondPaneRef = useRef(null);\n const containerRef = useRef(null);\n const containerSize = useRef(null);\n const primarySizeRef = useRef(null);\n const referencePaneSize = useRef(undefined);\n const savedPos = useRef(undefined);\n\n const measurementProp = propsForDirection[direction].dim;\n const clientAxis = propsForDirection[direction].axis;\n const minDimProp = propsForDirection[direction].min;\n const maxDimProp = propsForDirection[direction].max;\n const dragStart = useRef(null);\n\n const onPointerDown = useCallback(\n (e: React.PointerEvent) => {\n if (!firstPaneRef.current || !secondPaneRef.current) {\n return;\n }\n\n // measure left-side width\n primarySizeRef.current = firstPaneRef.current!.getBoundingClientRect()[measurementProp];\n containerSize.current = containerRef.current!.getBoundingClientRect()[measurementProp];\n\n dragStart.current = e[clientAxis];\n splitterRef.current!.setPointerCapture(e.pointerId);\n\n if (usePixels) {\n referencePaneSize.current = measureElement(secondPaneRef.current, usePixels);\n } else {\n referencePaneSize.current = measureElement(firstPaneRef.current);\n }\n\n savedPos.current = undefined;\n },\n [measurementProp, clientAxis, usePixels]\n );\n\n const onUpdateSize = useCallback(\n (diff: number) => {\n if (!containerSize.current || !primarySizeRef.current || !secondPaneRef.current) {\n return;\n }\n\n const firstPanePixels = primarySizeRef.current;\n const secondPanePixels = containerSize.current - firstPanePixels - handleSize;\n const dims = referencePaneSize.current!;\n\n if (usePixels) {\n const newSize = clamp(secondPanePixels - diff, dims[minDimProp], dims[maxDimProp]);\n secondPaneRef.current!.style.flexBasis = `${newSize}px`;\n splitterRef.current!.ariaValueNow = `${newSize}`;\n onResizing?.(newSize, firstPanePixels + diff, newSize);\n } else {\n const newSize = clamp(primarySizeRef.current + diff, dims[minDimProp], dims[maxDimProp]);\n const newFlex = newSize / (containerSize.current! - handleSize);\n firstPaneRef.current!.style.flexGrow = `${newFlex}`;\n secondPaneRef.current!.style.flexGrow = `${1 - newFlex}`;\n splitterRef.current!.ariaValueNow = ariaValue(newSize, dims[minDimProp], dims[maxDimProp]);\n onResizing?.(newFlex, newSize, secondPanePixels - diff);\n }\n },\n [onResizing, handleSize, usePixels, minDimProp, maxDimProp]\n );\n\n const onPointerMove = useCallback(\n (e: React.PointerEvent) => {\n if (dragStart.current !== null) {\n onUpdateSize(e[clientAxis] - dragStart.current);\n }\n },\n [onUpdateSize, clientAxis]\n );\n\n const onPointerUp = useCallback(\n (e: React.PointerEvent) => {\n e.preventDefault();\n e.stopPropagation();\n\n dragStart.current = null;\n\n splitterRef.current!.releasePointerCapture(e.pointerId);\n\n const firstPaneSize = firstPaneRef.current!.getBoundingClientRect()[measurementProp];\n const secondPanePixels = containerSize.current! - firstPaneSize - handleSize;\n\n onSizeChanged?.(parseFloat(firstPaneRef.current!.style.flexGrow), firstPaneSize, secondPanePixels);\n },\n [onSizeChanged, handleSize, measurementProp]\n );\n\n const pressedKeys = useRef(new Set());\n const keysLastHandledAt = useRef(null);\n const handlePressedKeys = useCallback(\n (time: number) => {\n const nothingPressed = pressedKeys.current.size === 0;\n if (nothingPressed) {\n keysLastHandledAt.current = null;\n return;\n } else if (primarySizeRef.current === null) {\n return;\n }\n\n const dt = time - (keysLastHandledAt.current ?? time);\n const dx = dt * PIXELS_PER_MS;\n let sizeChange = 0;\n\n if (direction === 'row') {\n if (pressedKeys.current.has('ArrowLeft')) {\n sizeChange -= dx;\n }\n if (pressedKeys.current.has('ArrowRight')) {\n sizeChange += dx;\n }\n } else {\n if (pressedKeys.current.has('ArrowUp')) {\n sizeChange -= dx;\n }\n if (pressedKeys.current.has('ArrowDown')) {\n sizeChange += dx;\n }\n }\n\n // measure primary and container\n primarySizeRef.current = firstPaneRef.current!.getBoundingClientRect()[measurementProp];\n containerSize.current = containerRef.current!.getBoundingClientRect()[measurementProp];\n\n onUpdateSize(sizeChange);\n\n keysLastHandledAt.current = time;\n\n window.requestAnimationFrame(handlePressedKeys);\n },\n [direction, measurementProp, onUpdateSize]\n );\n\n const onKeyDown = useCallback(\n (e: React.KeyboardEvent) => {\n if (!firstPaneRef.current || !secondPaneRef.current || !splitterRef.current || !containerRef.current) {\n return;\n }\n\n if (\n !(\n (direction === 'column' && VERTICAL_KEYS.has(e.key)) ||\n (direction === 'row' && HORIZONTAL_KEYS.has(e.key))\n ) ||\n pressedKeys.current.has(e.key)\n ) {\n return;\n }\n\n savedPos.current = undefined;\n e.preventDefault();\n e.stopPropagation();\n\n primarySizeRef.current = firstPaneRef.current.getBoundingClientRect()[measurementProp];\n containerSize.current = containerRef.current!.getBoundingClientRect()[measurementProp];\n\n if (usePixels) {\n referencePaneSize.current = measureElement(secondPaneRef.current!);\n } else {\n referencePaneSize.current = measureElement(firstPaneRef.current!);\n }\n\n const newKey = !pressedKeys.current.has(e.key);\n\n if (newKey) {\n const initiateAnimationLoop = pressedKeys.current.size === 0;\n pressedKeys.current.add(e.key);\n\n if (initiateAnimationLoop) {\n window.requestAnimationFrame(handlePressedKeys);\n }\n }\n },\n [direction, handlePressedKeys, , measurementProp, usePixels]\n );\n\n const onKeyUp = useCallback(\n (e: React.KeyboardEvent) => {\n if (\n (direction === 'row' && !HORIZONTAL_KEYS.has(e.key)) ||\n (direction === 'column' && !VERTICAL_KEYS.has(e.key))\n ) {\n return;\n }\n\n pressedKeys.current.delete(e.key);\n\n if (primarySizeRef.current !== null) {\n const secondPanePixels = containerSize.current! - primarySizeRef.current - handleSize;\n onSizeChanged?.(parseFloat(firstPaneRef.current!.style.flexGrow), primarySizeRef.current, secondPanePixels);\n }\n },\n [direction, onSizeChanged, handleSize]\n );\n\n const onDoubleClick = useCallback(() => {\n if (!firstPaneRef.current || !secondPaneRef.current) {\n return;\n }\n\n if (usePixels) {\n secondPaneRef.current.style.flexBasis = `${initialSize}px`;\n } else {\n firstPaneRef.current.style.flexGrow = '0.5';\n secondPaneRef.current.style.flexGrow = '0.5';\n primarySizeRef.current = firstPaneRef.current!.getBoundingClientRect()[measurementProp];\n splitterRef.current!.ariaValueNow = `50`;\n }\n }, [measurementProp, usePixels, initialSize]);\n\n const onBlur = useCallback(() => {\n // If focus is lost while keys are held, stop changing panel sizes\n if (pressedKeys.current.size > 0) {\n pressedKeys.current.clear();\n dragStart.current = null;\n\n if (typeof primarySizeRef.current === 'number') {\n const secondPanePixels = containerSize.current! - primarySizeRef.current - handleSize;\n onSizeChanged?.(parseFloat(firstPaneRef.current!.style.flexGrow), primarySizeRef.current, secondPanePixels);\n }\n }\n }, [onSizeChanged, handleSize]);\n\n const styles = useStyles2(getStyles, direction);\n const dragStyles = useStyles2(getDragStyles, dragPosition);\n const dragHandleStyle = direction === 'column' ? dragStyles.dragHandleHorizontal : dragStyles.dragHandleVertical;\n const id = useId();\n\n const primaryStyles: React.CSSProperties = {\n flexGrow: clamp(initialSize, 0, 1),\n [minDimProp]: 'min-content',\n };\n\n const secondaryStyles: React.CSSProperties = {\n flexGrow: clamp(1 - initialSize, 0, 1),\n [minDimProp]: 'min-content',\n };\n\n if (usePixels) {\n primaryStyles.flexGrow = 1;\n secondaryStyles.flexGrow = 'unset';\n secondaryStyles.flexBasis = `${initialSize}px`;\n }\n\n return {\n containerProps: {\n ref: containerRef,\n className: styles.container,\n },\n primaryProps: {\n ref: firstPaneRef,\n className: styles.panel,\n style: primaryStyles,\n },\n secondaryProps: {\n ref: secondPaneRef,\n className: styles.panel,\n style: secondaryStyles,\n },\n splitterProps: {\n onPointerUp,\n onPointerDown,\n onPointerMove,\n onKeyDown,\n onKeyUp,\n onDoubleClick,\n onBlur,\n ref: splitterRef,\n style: { [measurementProp]: `${handleSize}px` },\n role: 'separator',\n 'aria-valuemin': 0,\n 'aria-valuemax': 100,\n 'aria-valuenow': initialSize * 100,\n 'aria-controls': `start-panel-${id}`,\n 'aria-label': 'Pane resize widget',\n tabIndex: 0,\n className: dragHandleStyle,\n },\n };\n}\n\nfunction ariaValue(value: number, min: number, max: number) {\n return `${clamp(((value - min) / (max - min)) * 100, 0, 100)}`;\n}\n\ninterface MeasureResult {\n minWidth: number;\n maxWidth: number;\n minHeight: number;\n maxHeight: number;\n}\n\nfunction measureElement(ref: T, usePixels?: boolean): MeasureResult {\n const savedBodyOverflow = document.body.style.overflow;\n const savedWidth = ref.style.width;\n const savedHeight = ref.style.height;\n const savedFlex = ref.style.flexGrow;\n const savedFlexBasis = ref.style.flexBasis;\n\n document.body.style.overflow = 'hidden';\n\n ref.style.flexGrow = '0';\n ref.style.flexBasis = '0';\n\n const { width: minWidth, height: minHeight } = ref.getBoundingClientRect();\n\n ref.style.flexGrow = '100';\n\n const { width: maxWidth, height: maxHeight } = ref.getBoundingClientRect();\n\n document.body.style.overflow = savedBodyOverflow;\n\n ref.style.width = savedWidth;\n ref.style.height = savedHeight;\n ref.style.flexGrow = savedFlex;\n ref.style.flexBasis = savedFlexBasis;\n\n return { minWidth, maxWidth, minHeight, maxHeight };\n}\n\nfunction getStyles(theme: GrafanaTheme2, direction: UseSplitterOptions['direction']) {\n return {\n container: css({\n display: 'flex',\n flexDirection: direction === 'row' ? 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