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 王天杨
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import { shallowEqual } from '@react-dnd/shallowequal'
import type { Backend, Identifier, Unsubscribe } from 'dnd-core'
import type { ReactElement, Ref, RefObject } from 'react'
import type { DragPreviewOptions, DragSourceOptions } from '../types/index.js'
import { isRef } from './isRef.js'
import { wrapConnectorHooks } from './wrapConnectorHooks.js'
export interface Connector {
hooks: any
connectTarget: any
receiveHandlerId(handlerId: Identifier | null): void
reconnect(): void
}
export class SourceConnector implements Connector {
public hooks = wrapConnectorHooks({
dragSource: (
node: Element | ReactElement | Ref<any>,
options?: DragSourceOptions,
) => {
this.clearDragSource()
this.dragSourceOptions = options || null
if (isRef(node)) {
this.dragSourceRef = node as RefObject<any>
} else {
this.dragSourceNode = node
}
this.reconnectDragSource()
},
dragPreview: (node: any, options?: DragPreviewOptions) => {
this.clearDragPreview()
this.dragPreviewOptions = options || null
if (isRef(node)) {
this.dragPreviewRef = node
} else {
this.dragPreviewNode = node
}
this.reconnectDragPreview()
},
})
private handlerId: Identifier | null = null
// The drop target may either be attached via ref or connect function
private dragSourceRef: RefObject<any> | null = null
private dragSourceNode: any
private dragSourceOptionsInternal: DragSourceOptions | null = null
private dragSourceUnsubscribe: Unsubscribe | undefined
// The drag preview may either be attached via ref or connect function
private dragPreviewRef: RefObject<any> | null = null
private dragPreviewNode: any
private dragPreviewOptionsInternal: DragPreviewOptions | null = null
private dragPreviewUnsubscribe: Unsubscribe | undefined
private lastConnectedHandlerId: Identifier | null = null
private lastConnectedDragSource: any = null
private lastConnectedDragSourceOptions: any = null
private lastConnectedDragPreview: any = null
private lastConnectedDragPreviewOptions: any = null
private readonly backend: Backend
public constructor(backend: Backend) {
this.backend = backend
}
public receiveHandlerId(newHandlerId: Identifier | null): void {
if (this.handlerId === newHandlerId) {
return
}
this.handlerId = newHandlerId
this.reconnect()
}
public get connectTarget(): any {
return this.dragSource
}
public get dragSourceOptions(): DragSourceOptions | null {
return this.dragSourceOptionsInternal
}
public set dragSourceOptions(options: DragSourceOptions | null) {
this.dragSourceOptionsInternal = options
}
public get dragPreviewOptions(): DragPreviewOptions | null {
return this.dragPreviewOptionsInternal
}
public set dragPreviewOptions(options: DragPreviewOptions | null) {
this.dragPreviewOptionsInternal = options
}
public reconnect(): void {
const didChange = this.reconnectDragSource()
this.reconnectDragPreview(didChange)
}
private reconnectDragSource(): boolean {
const dragSource = this.dragSource
// if nothing has changed then don't resubscribe
const didChange =
this.didHandlerIdChange() ||
this.didConnectedDragSourceChange() ||
this.didDragSourceOptionsChange()
if (didChange) {
this.disconnectDragSource()
}
if (!this.handlerId) {
return didChange
}
if (!dragSource) {
this.lastConnectedDragSource = dragSource
return didChange
}
if (didChange) {
this.lastConnectedHandlerId = this.handlerId
this.lastConnectedDragSource = dragSource
this.lastConnectedDragSourceOptions = this.dragSourceOptions
this.dragSourceUnsubscribe = this.backend.connectDragSource(
this.handlerId,
dragSource,
this.dragSourceOptions,
)
}
return didChange
}
private reconnectDragPreview(forceDidChange = false): void {
const dragPreview = this.dragPreview
// if nothing has changed then don't resubscribe
const didChange =
forceDidChange ||
this.didHandlerIdChange() ||
this.didConnectedDragPreviewChange() ||
this.didDragPreviewOptionsChange()
if (didChange) {
this.disconnectDragPreview()
}
if (!this.handlerId) {
return
}
if (!dragPreview) {
this.lastConnectedDragPreview = dragPreview
return
}
if (didChange) {
this.lastConnectedHandlerId = this.handlerId
this.lastConnectedDragPreview = dragPreview
this.lastConnectedDragPreviewOptions = this.dragPreviewOptions
this.dragPreviewUnsubscribe = this.backend.connectDragPreview(
this.handlerId,
dragPreview,
this.dragPreviewOptions,
)
}
}
private didHandlerIdChange(): boolean {
return this.lastConnectedHandlerId !== this.handlerId
}
private didConnectedDragSourceChange(): boolean {
return this.lastConnectedDragSource !== this.dragSource
}
private didConnectedDragPreviewChange(): boolean {
return this.lastConnectedDragPreview !== this.dragPreview
}
private didDragSourceOptionsChange(): boolean {
return !shallowEqual(
this.lastConnectedDragSourceOptions,
this.dragSourceOptions,
)
}
private didDragPreviewOptionsChange(): boolean {
return !shallowEqual(
this.lastConnectedDragPreviewOptions,
this.dragPreviewOptions,
)
}
public disconnectDragSource() {
if (this.dragSourceUnsubscribe) {
this.dragSourceUnsubscribe()
this.dragSourceUnsubscribe = undefined
}
}
public disconnectDragPreview() {
if (this.dragPreviewUnsubscribe) {
this.dragPreviewUnsubscribe()
this.dragPreviewUnsubscribe = undefined
this.dragPreviewNode = null
this.dragPreviewRef = null
}
}
private get dragSource() {
return (
this.dragSourceNode || (this.dragSourceRef && this.dragSourceRef.current)
)
}
private get dragPreview() {
return (
this.dragPreviewNode ||
(this.dragPreviewRef && this.dragPreviewRef.current)
)
}
private clearDragSource() {
this.dragSourceNode = null
this.dragSourceRef = null
}
private clearDragPreview() {
this.dragPreviewNode = null
this.dragPreviewRef = null
}
}
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