| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and 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 {memo} from 'react'; |
| 12 | import {areEqual} from 'react-window'; |
| 13 | import {getGradientColor} from './utils'; |
| 14 | |
| 15 | import styles from './SnapshotCommitListItem.css'; |
| 16 | |
| 17 | import type {ItemData} from './SnapshotCommitList'; |
| 18 | |
| 19 | type Props = { |
| 20 | data: ItemData, |
| 21 | index: number, |
| 22 | style: Object, |
| 23 | ... |
| 24 | }; |
| 25 | |
| 26 | function SnapshotCommitListItem({data: itemData, index, style}: Props) { |
| 27 | const { |
| 28 | filteredCommitIndices, |
| 29 | maxDuration, |
| 30 | selectedCommitIndex, |
| 31 | selectCommitIndex, |
| 32 | setHoveredCommitIndex, |
| 33 | startCommitDrag, |
| 34 | totalDurations, |
| 35 | } = itemData; |
| 36 | |
| 37 | index = filteredCommitIndices[index]; |
| 38 | |
| 39 | const totalDuration = totalDurations[index]; |
| 40 | |
| 41 | // Use natural cbrt for bar height. |
| 42 | // This prevents one (or a few) outliers from squishing the majority of other commits. |
| 43 | // So rather than e.g. _█_ we get something more like e.g. ▄█_ |
| 44 | const heightScale = |
| 45 | Math.min( |
| 46 | 1, |
| 47 | Math.max(0, Math.cbrt(totalDuration) / Math.cbrt(maxDuration)), |
| 48 | ) || 0; |
| 49 | |
| 50 | // Use a linear scale for color. |
| 51 | // This gives some visual contrast between cheaper and more expensive commits |
| 52 | // and somewhat compensates for the cbrt scale height. |
| 53 | const colorScale = Math.min(1, Math.max(0, totalDuration / maxDuration)) || 0; |
| 54 | |
| 55 | const isSelected = selectedCommitIndex === index; |
| 56 | |
| 57 | // Leave a 1px gap between snapshots |
| 58 | const width = parseFloat(style.width) - 1; |
| 59 | |
| 60 | const handleMouseDown = ({buttons, target}: any) => { |
| 61 | if (buttons === 1) { |
| 62 | selectCommitIndex(index); |
| 63 | startCommitDrag({ |
| 64 | commitIndex: index, |
| 65 | left: target.getBoundingClientRect().left, |
| 66 | sizeIncrement: parseFloat(style.width), |
| 67 | }); |
| 68 | } |
| 69 | }; |
| 70 | |
| 71 | let backgroundColor; |
| 72 | if (!isSelected && totalDuration > 0) { |
| 73 | backgroundColor = getGradientColor(colorScale); |
| 74 | } |
| 75 | |
| 76 | return ( |
| 77 | <div |
| 78 | className={styles.Outer} |
| 79 | onMouseDown={handleMouseDown} |
| 80 | onMouseEnter={() => setHoveredCommitIndex(index)} |
| 81 | style={{ |
| 82 | ...style, |
| 83 | width, |
| 84 | borderBottom: isSelected |
| 85 | ? '3px solid var(--color-tab-selected-border)' |
| 86 | : undefined, |
| 87 | }}> |
| 88 | <div |
| 89 | className={isSelected ? styles.InnerSelected : styles.Inner} |
| 90 | style={{ |
| 91 | height: `${Math.round(heightScale * 100)}%`, |
| 92 | backgroundColor, |
| 93 | }} |
| 94 | /> |
| 95 | </div> |
| 96 | ); |
| 97 | } |
| 98 | |
| 99 | export default memo(SnapshotCommitListItem, areEqual) as component( |
| 100 | ...props: Props |
| 101 | ); |