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Sequester zoom concerns to ZoomManager in plexus (#409)
Sequester zoom concerns to ZoomManager in plexus
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| // Copyright (c) 2019 Uber Technologies, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| import { select, Selection } from 'd3-selection'; | ||
| import { | ||
| zoom as d3Zoom, | ||
| zoomTransform as getTransform, | ||
| ZoomTransform as ZoomTransform_, | ||
| ZoomBehavior, | ||
| zoomIdentity, | ||
| } from 'd3-zoom'; | ||
|
|
||
| import { | ||
| constrainZoom, | ||
| DEFAULT_SCALE_EXTENT, | ||
| fitWithinContainer, | ||
| getScaleExtent, | ||
| getZoomAttr, | ||
| getZoomStyle, | ||
| } from './utils'; | ||
|
|
||
| export { zoomIdentity } from 'd3-zoom'; | ||
|
|
||
| export type ZoomTransform = ZoomTransform_; | ||
|
|
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| type TUpdateCallback = (xform: ZoomTransform) => void; | ||
|
|
||
| type TSize = { height: number; width: number }; | ||
|
|
||
| type TZoomProps = { | ||
| x: number; | ||
| y: number; | ||
| k: number; | ||
| contentHeight: number; | ||
| contentWidth: number; | ||
| viewAll: () => void; | ||
| viewportHeight: number; | ||
| viewportWidth: number; | ||
| }; | ||
|
|
||
| export default class ZoomManager { | ||
| static getZoomAttr(zoomTransform: ZoomTransform | void) { | ||
| return getZoomAttr(zoomTransform); | ||
| } | ||
|
|
||
| static getZoomStyle(zoomTransform: ZoomTransform | void) { | ||
| return getZoomStyle(zoomTransform); | ||
| } | ||
|
|
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| private elem: Element | null = null; | ||
| private contentSize: TSize | null = null; | ||
| private selection: Selection<Element, ZoomTransform, any, any> | null = null; | ||
| private readonly updateCallback: TUpdateCallback; | ||
| private readonly zoom: ZoomBehavior<Element, ZoomTransform>; | ||
| private currentTransform: ZoomTransform = zoomIdentity; | ||
|
|
||
| constructor(updateCallback: TUpdateCallback) { | ||
| this.updateCallback = updateCallback; | ||
| this.zoom = d3Zoom<Element, ZoomTransform>() | ||
| .scaleExtent(DEFAULT_SCALE_EXTENT) | ||
| .constrain(this.constrainZoom) | ||
| .on('zoom', this.onZoomed); | ||
| } | ||
|
|
||
| public setElement(elem: Element) { | ||
| if (elem === this.elem) { | ||
| return; | ||
| } | ||
| this.elem = elem; | ||
| this.selection = select(elem); | ||
| this.selection.call(this.zoom); | ||
| this.setExtent(); | ||
| this.resetZoom(); | ||
| } | ||
|
|
||
| public setContentSize(size: TSize) { | ||
| if ( | ||
| !this.contentSize || | ||
| this.contentSize.height !== size.height || | ||
| this.contentSize.width !== size.width | ||
| ) { | ||
| this.contentSize = size; | ||
| } | ||
| this.setExtent(); | ||
| this.resetZoom(); | ||
| } | ||
|
|
||
| public resetZoom = () => { | ||
| const elem = this.elem; | ||
| const selection = this.selection; | ||
| const size = this.contentSize; | ||
| if (!elem || !selection || !size) { | ||
| this.updateCallback(zoomIdentity); | ||
| return; | ||
| } | ||
| const { clientHeight: viewHeight, clientWidth: viewWidth } = elem; | ||
| this.currentTransform = fitWithinContainer(size.width, size.height, viewWidth, viewHeight); | ||
| this.zoom.transform(selection, this.currentTransform); | ||
| this.updateCallback(this.currentTransform); | ||
| }; | ||
|
|
||
| public getProps(): TZoomProps { | ||
| const { x, y, k } = this.currentTransform; | ||
| const { height: contentHeight = 1, width: contentWidth = 1 } = this.contentSize || {}; | ||
| const { clientHeight: viewportHeight = 1, clientWidth: viewportWidth = 1 } = this.elem || {}; | ||
| return { | ||
| contentHeight, | ||
| contentWidth, | ||
| k, | ||
| viewportHeight, | ||
| viewportWidth, | ||
| x, | ||
| y, | ||
| viewAll: this.resetZoom, | ||
| }; | ||
| } | ||
|
|
||
| private setExtent() { | ||
| const elem = this.elem; | ||
| const size = this.contentSize; | ||
| if (!elem || !size) { | ||
| return; | ||
| } | ||
| const { clientHeight: viewHeight, clientWidth: viewWidth } = elem; | ||
| const scaleExtent = getScaleExtent(size.width, size.height, viewWidth, viewHeight); | ||
| this.zoom.scaleExtent(scaleExtent); | ||
| } | ||
|
|
||
| private onZoomed = () => { | ||
| if (!this.elem) { | ||
| return; | ||
| } | ||
| this.currentTransform = getTransform(this.elem); | ||
| this.updateCallback(this.currentTransform); | ||
| }; | ||
|
|
||
| private constrainZoom = (transform: ZoomTransform, extent: [[number, number], [number, number]]) => { | ||
| if (!this.contentSize) { | ||
| return transform; | ||
| } | ||
| const { height, width } = this.contentSize; | ||
| const [, [vw, vh]] = extent; | ||
| return constrainZoom(transform, width, height, vw, vh); | ||
| }; | ||
| } |
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