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Add screenshots to Scheduling Profiler
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Brian Vaughn
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Aug 13, 2021
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208 changes: 208 additions & 0 deletions
208
packages/react-devtools-scheduling-profiler/src/content-views/SnapshotsView.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,208 @@ | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow | ||
| */ | ||
|
|
||
| import type {Snapshot, ReactProfilerData} from '../types'; | ||
| import type { | ||
| Interaction, | ||
| MouseMoveInteraction, | ||
| Rect, | ||
| Size, | ||
| Surface, | ||
| ViewRefs, | ||
| } from '../view-base'; | ||
|
|
||
| import {positioningScaleFactor, timestampToPosition} from './utils/positioning'; | ||
| import { | ||
| intersectionOfRects, | ||
| rectContainsPoint, | ||
| rectEqualToRect, | ||
| View, | ||
| } from '../view-base'; | ||
| import {BORDER_SIZE, COLORS, SNAPSHOT_HEIGHT} from './constants'; | ||
|
|
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| type OnHover = (node: Snapshot | null) => void; | ||
|
|
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| export class SnapshotsView extends View { | ||
| _intrinsicSize: Size; | ||
| _profilerData: ReactProfilerData; | ||
|
|
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| onHover: OnHover | null = null; | ||
|
|
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| constructor(surface: Surface, frame: Rect, profilerData: ReactProfilerData) { | ||
| super(surface, frame); | ||
|
|
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| this._intrinsicSize = { | ||
| width: profilerData.duration, | ||
| height: SNAPSHOT_HEIGHT, | ||
| }; | ||
| this._profilerData = profilerData; | ||
| } | ||
|
|
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| desiredSize() { | ||
| return this._intrinsicSize; | ||
| } | ||
|
|
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| draw(context: CanvasRenderingContext2D) { | ||
| const {visibleArea} = this; | ||
|
|
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| context.fillStyle = COLORS.BACKGROUND; | ||
| context.fillRect( | ||
| visibleArea.origin.x, | ||
| visibleArea.origin.y, | ||
| visibleArea.size.width, | ||
| visibleArea.size.height, | ||
| ); | ||
|
|
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| const y = visibleArea.origin.y; | ||
|
|
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| let x = visibleArea.origin.x; | ||
|
|
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| // Rather than drawing each snapshot where it occured, | ||
| // draw them at fixed intervals and just show the nearest one. | ||
| while (x < visibleArea.origin.x + visibleArea.size.width) { | ||
| const snapshot = this._findClosestSnapshot(x); | ||
|
|
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| const scaledHeight = SNAPSHOT_HEIGHT; | ||
| const scaledWidth = (snapshot.width * SNAPSHOT_HEIGHT) / snapshot.height; | ||
|
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| const imageRect: Rect = { | ||
| origin: { | ||
| x, | ||
| y, | ||
| }, | ||
| size: {width: scaledWidth, height: scaledHeight}, | ||
| }; | ||
|
|
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| // Lazily create and cache Image objects as we render a snapsho for the first time. | ||
| if (snapshot.image === null) { | ||
| const img = (snapshot.image = new Image()); | ||
| img.onload = () => { | ||
| this._drawSnapshotImage(context, snapshot, imageRect); | ||
| }; | ||
| img.src = snapshot.imageSource; | ||
| } else { | ||
| this._drawSnapshotImage(context, snapshot, imageRect); | ||
| } | ||
|
|
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| x += scaledWidth + BORDER_SIZE; | ||
| } | ||
| } | ||
|
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| handleInteraction(interaction: Interaction, viewRefs: ViewRefs) { | ||
| switch (interaction.type) { | ||
| case 'mousemove': | ||
| this._handleMouseMove(interaction, viewRefs); | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| _drawSnapshotImage( | ||
| context: CanvasRenderingContext2D, | ||
| snapshot: Snapshot, | ||
| imageRect: Rect, | ||
| ) { | ||
| const visibleArea = this.visibleArea; | ||
|
|
||
| // Prevent snapshot from visibly overflowing its container when clipped. | ||
| const shouldClip = !rectEqualToRect(imageRect, visibleArea); | ||
| if (shouldClip) { | ||
| const clippedRect = intersectionOfRects(imageRect, visibleArea); | ||
| context.save(); | ||
| context.beginPath(); | ||
| context.rect( | ||
| clippedRect.origin.x, | ||
| clippedRect.origin.y, | ||
| clippedRect.size.width, | ||
| clippedRect.size.height, | ||
| ); | ||
| context.closePath(); | ||
| context.clip(); | ||
| } | ||
|
|
||
| // $FlowFixMe Flow doesn't know about the 9 argument variant of drawImage() | ||
| context.drawImage( | ||
| snapshot.image, | ||
|
|
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| // Image coordinates | ||
| 0, | ||
| 0, | ||
|
|
||
| // Native image size | ||
| snapshot.width, | ||
| snapshot.height, | ||
|
|
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| // Canvas coordinates | ||
| imageRect.origin.x, | ||
| imageRect.origin.y, | ||
|
|
||
| // Scaled image size | ||
| imageRect.size.width, | ||
| imageRect.size.height, | ||
| ); | ||
|
|
||
| if (shouldClip) { | ||
| context.restore(); | ||
| } | ||
| } | ||
|
|
||
| _findClosestSnapshot(x: number): Snapshot { | ||
| const frame = this.frame; | ||
| const scaleFactor = positioningScaleFactor( | ||
| this._intrinsicSize.width, | ||
| frame, | ||
| ); | ||
|
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| const snapshots = this._profilerData.snapshots; | ||
|
|
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| let startIndex = 0; | ||
| let stopIndex = snapshots.length - 1; | ||
| while (startIndex <= stopIndex) { | ||
| const currentIndex = Math.floor((startIndex + stopIndex) / 2); | ||
| const snapshot = snapshots[currentIndex]; | ||
| const {timestamp} = snapshot; | ||
|
|
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| const snapshotX = Math.floor( | ||
| timestampToPosition(timestamp, scaleFactor, frame), | ||
| ); | ||
|
|
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| if (x < snapshotX) { | ||
| stopIndex = currentIndex - 1; | ||
| } else { | ||
| startIndex = currentIndex + 1; | ||
| } | ||
| } | ||
|
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| return snapshots[stopIndex]; | ||
| } | ||
|
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| /** | ||
| * @private | ||
| */ | ||
| _handleMouseMove(interaction: MouseMoveInteraction, viewRefs: ViewRefs) { | ||
| const {onHover, visibleArea} = this; | ||
| if (!onHover) { | ||
| return; | ||
| } | ||
|
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| const {location} = interaction.payload; | ||
| if (!rectContainsPoint(location, visibleArea)) { | ||
| onHover(null); | ||
| return; | ||
| } | ||
|
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| const snapshot = this._findClosestSnapshot(location.x); | ||
| if (snapshot) { | ||
| this.currentCursor = 'context-menu'; | ||
| viewRefs.hoveredView = this; | ||
| onHover(snapshot); | ||
| } else { | ||
| onHover(null); | ||
| } | ||
| } | ||
| } |
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