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Viewport.vue
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Viewport.vue
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<script lang="ts" setup>
import type { D3ZoomEvent, ZoomTransform } from 'd3-zoom'
import { zoom, zoomIdentity } from 'd3-zoom'
import { pointer, select } from 'd3-selection'
import type { CoordinateExtent, FlowOptions, ViewportTransform } from '../../types'
import { PanOnScrollMode } from '../../types'
import Pane from '../Pane/Pane.vue'
import Transform from './Transform.vue'
const {
id,
minZoom,
maxZoom,
defaultViewport,
translateExtent,
dimensions,
zoomActivationKeyCode,
selectionKeyCode,
panActivationKeyCode,
panOnScroll,
panOnScrollMode,
panOnScrollSpeed,
panOnDrag,
zoomOnDoubleClick,
zoomOnPinch,
zoomOnScroll,
preventScrolling,
noWheelClassName,
noPanClassName,
setState,
emits,
connectionStartHandle,
userSelectionActive,
paneDragging,
} = $(useVueFlow())
const viewportEl = ref<HTMLDivElement>()
let selectionKeyPressed = $ref(false)
let isZoomingOrPanning = $ref(false)
let zoomedWithRightMouseButton = $ref(false)
let mouseButton = $ref(0)
const panKeyPressed = useKeyPress(panActivationKeyCode)
const isConnecting = $computed(() => !!connectionStartHandle)
const shouldPanOnDrag = computed(() => !selectionKeyPressed && panOnDrag && panKeyPressed.value)
const isSelecting = computed(
() => (selectionKeyCode !== true && selectionKeyPressed) || (selectionKeyCode === true && shouldPanOnDrag.value !== true),
)
let prevTransform = $ref<ViewportTransform>({
x: 0,
y: 0,
zoom: 0,
})
onMounted(() => {
useResizeObserver(viewportEl, setDimensions)
const window = useWindow()
useEventListener(window, 'resize', setDimensions)
})
onMounted(() => {
const viewportElement = viewportEl.value!
const bbox = viewportElement.getBoundingClientRect()
const d3Zoom = zoom<HTMLDivElement, any>().scaleExtent([minZoom, maxZoom]).translateExtent(translateExtent)
const d3Selection = select(viewportElement).call(d3Zoom)
const d3ZoomHandler = d3Selection.on('wheel.zoom')
const updatedTransform = zoomIdentity
.translate(defaultViewport.x ?? 0, defaultViewport.y ?? 0)
.scale(clamp(defaultViewport.zoom ?? 1, minZoom, maxZoom))
const extent: CoordinateExtent = [
[0, 0],
[bbox.width, bbox.height],
]
const constrainedTransform = d3Zoom.constrain()(updatedTransform, extent, translateExtent)
d3Zoom.transform(d3Selection, constrainedTransform)
setState({
d3Zoom,
d3Selection,
d3ZoomHandler,
viewport: { x: updatedTransform.x, y: updatedTransform.y, zoom: updatedTransform.k },
viewportRef: viewportElement,
})
const onKeyPress = (keyPress: boolean) => {
selectionKeyPressed = keyPress
if (keyPress && userSelectionActive && !isZoomingOrPanning) {
d3Zoom.on('zoom', null)
} else if (!keyPress && !userSelectionActive) {
d3Zoom.on('zoom', (event: D3ZoomEvent<HTMLDivElement, any>) => {
setState({ viewport: { x: event.transform.x, y: event.transform.y, zoom: event.transform.k } })
const flowTransform = eventToFlowTransform(event.transform)
zoomedWithRightMouseButton = isRightClickPan(panOnDrag, mouseButton ?? 0)
emits.viewportChange(flowTransform)
emits.move({ event, flowTransform })
})
}
}
useKeyPress(selectionKeyCode, onKeyPress)
// initialize
onKeyPress(false)
const zoomKeyPressed = useKeyPress(zoomActivationKeyCode)
d3Zoom.on('start', (event: D3ZoomEvent<HTMLDivElement, any>) => {
if (!event.sourceEvent) return null
// we need to remember it here, because it's always 0 in the "zoom" event
mouseButton = event.sourceEvent.button
isZoomingOrPanning = true
const flowTransform = eventToFlowTransform(event.transform)
if (event.sourceEvent?.type === 'mousedown') {
setState({ paneDragging: true })
}
prevTransform = flowTransform
emits.viewportChangeStart(flowTransform)
emits.moveStart({ event, flowTransform })
})
d3Zoom.on('end', (event: D3ZoomEvent<HTMLDivElement, any>) => {
if (!event.sourceEvent) return null
isZoomingOrPanning = false
setState({ paneDragging: false })
if (isRightClickPan(panOnDrag, mouseButton ?? 0) && !zoomedWithRightMouseButton) {
emits.paneContextMenu(event.sourceEvent)
}
zoomedWithRightMouseButton = false
if (viewChanged(prevTransform, event.transform)) {
const flowTransform = eventToFlowTransform(event.transform)
prevTransform = flowTransform
emits.viewportChangeEnd(flowTransform)
emits.moveEnd({ event, flowTransform })
}
})
watchEffect(() => {
if (panOnScroll && !zoomKeyPressed.value && !userSelectionActive) {
d3Selection
.on('wheel', (event: WheelEvent) => {
if (isWrappedWithClass(event, noWheelClassName)) {
return false
}
event.preventDefault()
event.stopImmediatePropagation()
const currentZoom = d3Selection.property('__zoom').k || 1
if (event.ctrlKey && zoomOnPinch) {
const point = pointer(event)
// taken from https://github.com/d3/d3-zoom/blob/master/src/zoom.js
const pinchDelta = -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002) * 10
const zoom = currentZoom * 2 ** pinchDelta
d3Zoom.scaleTo(d3Selection, zoom, point)
return
}
// increase scroll speed in firefox
// firefox: deltaMode === 1; chrome: deltaMode === 0
const deltaNormalize = event.deltaMode === 1 ? 20 : 1
const deltaX = panOnScrollMode === PanOnScrollMode.Vertical ? 0 : event.deltaX * deltaNormalize
const deltaY = panOnScrollMode === PanOnScrollMode.Horizontal ? 0 : event.deltaY * deltaNormalize
d3Zoom.translateBy(d3Selection, -(deltaX / currentZoom) * panOnScrollSpeed, -(deltaY / currentZoom) * panOnScrollSpeed)
})
.on('wheel.zoom', null)
} else if (typeof d3ZoomHandler !== 'undefined') {
d3Selection
.on('wheel', (event: WheelEvent) => {
if (!preventScrolling || isWrappedWithClass(event, noWheelClassName)) {
return null
}
event.preventDefault()
})
.on('wheel.zoom', d3ZoomHandler)
}
})
d3Zoom.filter((event: MouseEvent) => {
const zoomScroll = zoomKeyPressed.value || zoomOnScroll
const pinchZoom = zoomOnPinch && event.ctrlKey
if (
event.button === 1 &&
event.type === 'mousedown' &&
((event.target as HTMLElement)?.closest(`.vue-flow__node`) || (event.target as HTMLElement)?.closest(`.vue-flow__edge`))
) {
return true
}
// if all interactions are disabled, we prevent all zoom events
if (!panOnDrag && !zoomScroll && !panOnScroll && !zoomOnDoubleClick && !zoomOnPinch) return false
// during a selection we prevent all other interactions
if (userSelectionActive) return false
// if zoom on double click is disabled, we prevent the double click event
if (!zoomOnDoubleClick && event.type === 'dblclick') return false
// if the target element is inside an element with the nowheel class, we prevent zooming
if (isWrappedWithClass(event, noWheelClassName) && event.type === 'wheel') return false
// if the target element is inside an element with the nopan class, we prevent panning
if (isWrappedWithClass(event, noPanClassName) && event.type !== 'wheel') return false
if (!zoomOnPinch && event.ctrlKey && event.type === 'wheel') return false
// when there is no scroll handling enabled, we prevent all wheel events
if (!zoomScroll && !panOnScroll && !pinchZoom && event.type === 'wheel') return false
// if the pane is not movable, we prevent dragging it with mousestart or touchstart
if (!panOnDrag && (event.type === 'mousedown' || event.type === 'touchstart')) return false
// if the pane is only movable using allowed clicks
if (
Array.isArray(panOnDrag) &&
!panOnDrag.includes(event.button) &&
(event.type === 'mousedown' || event.type === 'touchstart')
) {
return false
}
// We only allow right clicks if pan on drag is set to right-click
const buttonAllowed = (Array.isArray(panOnDrag) && panOnDrag.includes(event.button)) || !event.button || event.button <= 1
// default filter for d3-zoom
return (!event.ctrlKey || event.type === 'wheel') && buttonAllowed
})
})
function isRightClickPan(pan: FlowOptions['panOnDrag'], usedButton: number) {
return usedButton === 2 && Array.isArray(pan) && pan.includes(2)
}
function viewChanged(prevViewport: ViewportTransform, eventTransform: ZoomTransform) {
return (
(prevViewport.x !== eventTransform.x && !isNaN(eventTransform.x)) ||
(prevViewport.y !== eventTransform.y && !isNaN(eventTransform.y)) ||
(prevViewport.zoom !== eventTransform.k && !isNaN(eventTransform.k))
)
}
function eventToFlowTransform(eventTransform: ZoomTransform): ViewportTransform {
return {
x: eventTransform.x,
y: eventTransform.y,
zoom: eventTransform.k,
}
}
function setDimensions() {
if (!viewportEl.value) return
const { width, height } = getDimensions(viewportEl.value)
if (width === 0 || height === 0) warn('The Vue Flow parent container needs a width and a height to render the graph.')
dimensions.width = width || 500
dimensions.height = height || 500
}
function isWrappedWithClass(event: Event, className: string | undefined) {
return (event.target as Element).closest(`.${className}`)
}
</script>
<script lang="ts">
export default {
name: 'Viewport',
compatConfig: { MODE: 3 },
}
</script>
<template>
<div ref="viewportEl" :key="`viewport-${id}`" class="vue-flow__viewport vue-flow__container">
<Pane :is-selecting="isSelecting" :class="{ connecting: isConnecting, dragging: paneDragging, draggable: !!panOnDrag }">
<Transform>
<slot name="zoom-pane" />
</Transform>
</Pane>
</div>
<slot />
</template>