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| 1 | +/** |
| 2 | + * Copyright (c) Facebook, Inc. and its affiliates. |
| 3 | + * |
| 4 | + * This source code is licensed under the MIT license found in the |
| 5 | + * LICENSE file in the root directory of this source tree. |
| 6 | + * |
| 7 | + * @flow |
| 8 | + */ |
| 9 | + |
| 10 | +import * as React from 'react'; |
| 11 | +import {useEffect, useLayoutEffect, useReducer, useRef} from 'react'; |
| 12 | +import { |
| 13 | + localStorageGetItem, |
| 14 | + localStorageSetItem, |
| 15 | +} from 'react-devtools-shared/src/storage'; |
| 16 | +import styles from './ComponentsResizer.css'; |
| 17 | + |
| 18 | +const LOCAL_STORAGE_KEY = 'React::DevTools::createResizeReducer'; |
| 19 | +const VERTICAL_MODE_MAX_WIDTH = 600; |
| 20 | +const MINIMUM_SIZE = 50; |
| 21 | + |
| 22 | +type Orientation = 'horizontal' | 'vertical'; |
| 23 | + |
| 24 | +type ResizeActionType = |
| 25 | + | 'ACTION_SET_DID_MOUNT' |
| 26 | + | 'ACTION_SET_IS_RESIZING' |
| 27 | + | 'ACTION_SET_HORIZONTAL_PERCENTAGE' |
| 28 | + | 'ACTION_SET_VERTICAL_PERCENTAGE'; |
| 29 | + |
| 30 | +type ResizeAction = {| |
| 31 | + type: ResizeActionType, |
| 32 | + payload: any, |
| 33 | +|}; |
| 34 | + |
| 35 | +type ResizeState = {| |
| 36 | + horizontalPercentage: number, |
| 37 | + isResizing: boolean, |
| 38 | + verticalPercentage: number, |
| 39 | +|}; |
| 40 | + |
| 41 | +function initResizeState(): ResizeState { |
| 42 | + let horizontalPercentage = 0.65; |
| 43 | + let verticalPercentage = 0.5; |
| 44 | + |
| 45 | + try { |
| 46 | + let data = localStorageGetItem(LOCAL_STORAGE_KEY); |
| 47 | + if (data != null) { |
| 48 | + data = JSON.parse(data); |
| 49 | + horizontalPercentage = data.horizontalPercentage; |
| 50 | + verticalPercentage = data.verticalPercentage; |
| 51 | + } |
| 52 | + } catch (error) {} |
| 53 | + |
| 54 | + return { |
| 55 | + horizontalPercentage, |
| 56 | + isResizing: false, |
| 57 | + verticalPercentage, |
| 58 | + }; |
| 59 | +} |
| 60 | + |
| 61 | +function resizeReducer(state: ResizeState, action: ResizeAction): ResizeState { |
| 62 | + switch (action.type) { |
| 63 | + case 'ACTION_SET_IS_RESIZING': |
| 64 | + return { |
| 65 | + ...state, |
| 66 | + isResizing: action.payload, |
| 67 | + }; |
| 68 | + case 'ACTION_SET_HORIZONTAL_PERCENTAGE': |
| 69 | + return { |
| 70 | + ...state, |
| 71 | + horizontalPercentage: action.payload, |
| 72 | + }; |
| 73 | + case 'ACTION_SET_VERTICAL_PERCENTAGE': |
| 74 | + return { |
| 75 | + ...state, |
| 76 | + verticalPercentage: action.payload, |
| 77 | + }; |
| 78 | + default: |
| 79 | + return state; |
| 80 | + } |
| 81 | +} |
| 82 | + |
| 83 | +type Props = {| |
| 84 | + children: ({ |
| 85 | + resizeElementRef: React$Ref<HTMLElement>, |
| 86 | + onResizeStart: () => void, |
| 87 | + }) => React$Node, |
| 88 | +|}; |
| 89 | + |
| 90 | +export default function ComponentsResizer({children}: Props) { |
| 91 | + const wrapperElementRef = useRef<HTMLElement>(null); |
| 92 | + const resizeElementRef = useRef<HTMLElement>(null); |
| 93 | + |
| 94 | + const [state, dispatch] = useReducer<ResizeState, ResizeAction>( |
| 95 | + resizeReducer, |
| 96 | + null, |
| 97 | + initResizeState, |
| 98 | + ); |
| 99 | + |
| 100 | + const {horizontalPercentage, verticalPercentage} = state; |
| 101 | + |
| 102 | + useLayoutEffect(() => { |
| 103 | + const resizeElement = resizeElementRef.current; |
| 104 | + |
| 105 | + setResizeCSSVariable( |
| 106 | + resizeElement, |
| 107 | + 'horizontal', |
| 108 | + horizontalPercentage * 100, |
| 109 | + ); |
| 110 | + setResizeCSSVariable(resizeElement, 'vertical', verticalPercentage * 100); |
| 111 | + }, []); |
| 112 | + |
| 113 | + useEffect(() => { |
| 114 | + const timeoutID = setTimeout(() => { |
| 115 | + localStorageSetItem( |
| 116 | + LOCAL_STORAGE_KEY, |
| 117 | + JSON.stringify({ |
| 118 | + horizontalPercentage, |
| 119 | + verticalPercentage, |
| 120 | + }), |
| 121 | + ); |
| 122 | + }, 500); |
| 123 | + |
| 124 | + return () => clearTimeout(timeoutID); |
| 125 | + }, [horizontalPercentage, verticalPercentage]); |
| 126 | + |
| 127 | + const {isResizing} = state; |
| 128 | + |
| 129 | + const onResizeStart = () => |
| 130 | + dispatch({type: 'ACTION_SET_IS_RESIZING', payload: true}); |
| 131 | + const onResizeEnd = () => |
| 132 | + dispatch({type: 'ACTION_SET_IS_RESIZING', payload: false}); |
| 133 | + |
| 134 | + const onResize = event => { |
| 135 | + const resizeElement = resizeElementRef.current; |
| 136 | + const wrapperElement = wrapperElementRef.current; |
| 137 | + |
| 138 | + if (!isResizing || wrapperElement === null || resizeElement === null) { |
| 139 | + return; |
| 140 | + } |
| 141 | + |
| 142 | + event.preventDefault(); |
| 143 | + |
| 144 | + const orientation = getOrientation(wrapperElement); |
| 145 | + |
| 146 | + const {height, width, left, top} = wrapperElement.getBoundingClientRect(); |
| 147 | + |
| 148 | + const currentMousePosition = |
| 149 | + orientation === 'horizontal' ? event.clientX - left : event.clientY - top; |
| 150 | + |
| 151 | + const boundaryMin = MINIMUM_SIZE; |
| 152 | + const boundaryMax = |
| 153 | + orientation === 'horizontal' |
| 154 | + ? width - MINIMUM_SIZE |
| 155 | + : height - MINIMUM_SIZE; |
| 156 | + |
| 157 | + const isMousePositionInBounds = |
| 158 | + currentMousePosition > boundaryMin && currentMousePosition < boundaryMax; |
| 159 | + |
| 160 | + if (isMousePositionInBounds) { |
| 161 | + const resizedElementDimension = |
| 162 | + orientation === 'horizontal' ? width : height; |
| 163 | + const actionType = |
| 164 | + orientation === 'horizontal' |
| 165 | + ? 'ACTION_SET_HORIZONTAL_PERCENTAGE' |
| 166 | + : 'ACTION_SET_VERTICAL_PERCENTAGE'; |
| 167 | + const percentage = (currentMousePosition / resizedElementDimension) * 100; |
| 168 | + |
| 169 | + setResizeCSSVariable(resizeElement, orientation, percentage); |
| 170 | + |
| 171 | + dispatch({ |
| 172 | + type: actionType, |
| 173 | + payload: currentMousePosition / resizedElementDimension, |
| 174 | + }); |
| 175 | + } |
| 176 | + }; |
| 177 | + |
| 178 | + return ( |
| 179 | + <div |
| 180 | + ref={wrapperElementRef} |
| 181 | + className={styles.ComponentsWrapper} |
| 182 | + {...(isResizing && { |
| 183 | + onMouseMove: onResize, |
| 184 | + onMouseLeave: onResizeEnd, |
| 185 | + onMouseUp: onResizeEnd, |
| 186 | + })}> |
| 187 | + {children({resizeElementRef, onResizeStart})} |
| 188 | + </div> |
| 189 | + ); |
| 190 | +} |
| 191 | + |
| 192 | +function getOrientation( |
| 193 | + wrapperElement: null | HTMLElement, |
| 194 | +): null | Orientation { |
| 195 | + if (wrapperElement != null) { |
| 196 | + const {width} = wrapperElement.getBoundingClientRect(); |
| 197 | + return width > VERTICAL_MODE_MAX_WIDTH ? 'horizontal' : 'vertical'; |
| 198 | + } |
| 199 | + return null; |
| 200 | +} |
| 201 | + |
| 202 | +function setResizeCSSVariable( |
| 203 | + resizeElement: null | HTMLElement, |
| 204 | + orientation: null | Orientation, |
| 205 | + percentage: number, |
| 206 | +): void { |
| 207 | + if (resizeElement !== null && orientation !== null) { |
| 208 | + resizeElement.style.setProperty( |
| 209 | + `--${orientation}-resize-percentage`, |
| 210 | + `${percentage}%`, |
| 211 | + ); |
| 212 | + } |
| 213 | +} |
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