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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| import { Point, Canvas } from 'fabric' | ||
| import { debounce } from 'lodash-es' | ||
| import { Disposable } from '@/utils/lifecycle' | ||
| import { useFabricStore } from '@/store' | ||
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| export const MIN_ZOOM = 0.03 | ||
| export const MAX_ZOOM = 5 | ||
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| export class FabricTouch extends Disposable { | ||
| isTwoTouch = false | ||
| isDragging = false | ||
| startDistance = 1 | ||
| startX = 0 | ||
| startY = 0 | ||
| startScale = 1 | ||
| lastPan?: Point | ||
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| constructor(private readonly canvas: Canvas) { | ||
| super() | ||
| this.initTouchEvent() | ||
| } | ||
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| initTouchEvent() { | ||
| const canvas = this.canvas?.upperCanvasEl | ||
| if (canvas) { | ||
| canvas.addEventListener('touchstart', this.touchStartHandle, { passive: false }) | ||
| canvas.addEventListener('touchmove', this.touchMoveHandle, { passive: false }) | ||
| canvas.addEventListener('touchend', this.touchEndHandle, { passive: false }) | ||
| } | ||
| } | ||
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| removeTouchEvent() { | ||
| const canvas = this.canvas?.upperCanvasEl | ||
| if (canvas) { | ||
| canvas.removeEventListener('touchstart', this.touchStartHandle) | ||
| canvas.removeEventListener('touchmove', this.touchMoveHandle) | ||
| canvas.removeEventListener('touchend', this.touchEndHandle) | ||
| } | ||
| } | ||
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| touchStartHandle = (e: TouchEvent) => { | ||
| e.preventDefault() | ||
| const canvas = this.canvas | ||
| if (!canvas) return | ||
| const touches = e.touches | ||
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| // brushMouseMixin.updateIsDisableDraw(touches.length >= 2) | ||
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| if (touches.length === 2) { | ||
| canvas.isDrawingMode = true | ||
| this.isTwoTouch = true | ||
| const touch1 = touches[0] | ||
| const touch2 = touches[1] | ||
| this.startDistance = Math.hypot( | ||
| touch2.pageX - touch1.pageX, | ||
| touch2.pageY - touch1.pageY | ||
| ) | ||
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| this.startX = (touch1.pageX + touch2.pageX) / 2 | ||
| this.startY = (touch1.pageY + touch2.pageY) / 2 | ||
| this.startScale = canvas.getZoom() | ||
| } | ||
| } | ||
| touchMoveHandle = (e: TouchEvent) => { | ||
| e.preventDefault() | ||
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| const canvas = this.canvas | ||
| if (!canvas) return | ||
| const touches = e.touches | ||
|
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| if (touches.length === 2) { | ||
| const touch1 = touches[0] | ||
| const touch2 = touches[1] | ||
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| const currentDistance = Math.hypot( | ||
| touch2.pageX - touch1.pageX, | ||
| touch2.pageY - touch1.pageY | ||
| ) | ||
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| const x = (touch1.pageX + touch2.pageX) / 2 | ||
| const y = (touch1.pageY + touch2.pageY) / 2 | ||
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| // Calculate zoom | ||
| let zoom = this.startScale * (currentDistance / this.startDistance) | ||
| zoom = Math.max(MIN_ZOOM, Math.min(MAX_ZOOM, zoom)) | ||
| // if (!useBoardStore.getState().isObjectCaching) { | ||
| // fabric.Object.prototype.set({ | ||
| // objectCaching: true | ||
| // }) | ||
| // } | ||
| canvas.zoomToPoint(new Point(this.startX, this.startY), zoom) | ||
| // paintBoard.evnet?.zoomEvent.updateZoomPercentage(true, zoom) | ||
|
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| // Calculate drag distance | ||
| const currentPan = new Point(x - this.startX, y - this.startY) | ||
| const fabricStore = useFabricStore() | ||
| fabricStore.setZoom(zoom) | ||
| // move canvas | ||
| if (!this.isDragging) { | ||
| this.isDragging = true | ||
| this.lastPan = currentPan | ||
| } else if (this.lastPan) { | ||
| // if (!useBoardStore.getState().isObjectCaching) { | ||
| // fabric.Object.prototype.set({ | ||
| // objectCaching: true | ||
| // }) | ||
| // } | ||
| canvas.relativePan( | ||
| new Point( | ||
| currentPan.x - this.lastPan.x, | ||
| currentPan.y - this.lastPan.y | ||
| ) | ||
| ) | ||
| this.lastPan = currentPan | ||
| this.saveTransform() | ||
| } | ||
| } | ||
| } | ||
| touchEndHandle = (e: TouchEvent) => { | ||
| this.isDragging = false | ||
| this.canvas.isDrawingMode = false | ||
| if (this.isTwoTouch && e.touches.length === 0) { | ||
| this.isTwoTouch = false | ||
| } | ||
| } | ||
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| saveTransform = debounce(() => { | ||
| const transform = this.canvas?.viewportTransform | ||
| if (transform) { | ||
| // useFileStore.getState().updateTransform(transform) | ||
| // if (!useBoardStore.getState().isObjectCaching) { | ||
| // fabric.Object.prototype.set({ | ||
| // objectCaching: false | ||
| // }) | ||
| // } | ||
| this.canvas?.requestRenderAll() | ||
| } | ||
| }, 500) | ||
| } |
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