kopia lustrzana https://github.com/Tldraw/Tldraw
57 wiersze
1.4 KiB
TypeScript
57 wiersze
1.4 KiB
TypeScript
import { StateNode, TLEventHandlers, Vec } from '@tldraw/editor'
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import { tldrawConstants } from '../../../tldraw-constants'
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const { CAMERA_SLIDE_FRICTION } = tldrawConstants
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export class Dragging extends StateNode {
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static override id = 'dragging'
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initialCamera = new Vec()
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override onEnter = () => {
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this.initialCamera = Vec.From(this.editor.getCamera())
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this.update()
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}
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override onPointerMove: TLEventHandlers['onPointerMove'] = () => {
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this.update()
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}
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override onPointerUp: TLEventHandlers['onPointerUp'] = () => {
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this.complete()
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}
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override onCancel: TLEventHandlers['onCancel'] = () => {
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this.parent.transition('idle')
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}
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override onComplete = () => {
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this.complete()
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}
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private update() {
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const { initialCamera, editor } = this
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const { currentScreenPoint, originScreenPoint } = editor.inputs
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const delta = Vec.Sub(currentScreenPoint, originScreenPoint).div(editor.getZoomLevel())
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if (delta.len2() === 0) return
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editor.setCamera(initialCamera.clone().add(delta))
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}
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private complete() {
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const { editor } = this
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const { pointerVelocity } = editor.inputs
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const velocityAtPointerUp = Math.min(pointerVelocity.len(), 2)
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if (velocityAtPointerUp > 0.1) {
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this.editor.slideCamera({
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speed: velocityAtPointerUp,
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direction: pointerVelocity,
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friction: CAMERA_SLIDE_FRICTION,
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})
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}
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this.parent.transition('idle')
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}
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}
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