bc518174
 王天杨
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import { invariant } from '@react-dnd/invariant'
import type {
DragDropManager,
DragDropMonitor,
Identifier,
Listener,
Unsubscribe,
XYCoord,
} from 'dnd-core'
import type { DropTargetMonitor } from '../types/index.js'
let isCallingCanDrop = false
export class DropTargetMonitorImpl implements DropTargetMonitor {
private internalMonitor: DragDropMonitor
private targetId: Identifier | null = null
public constructor(manager: DragDropManager) {
this.internalMonitor = manager.getMonitor()
}
public receiveHandlerId(targetId: Identifier | null): void {
this.targetId = targetId
}
public getHandlerId(): Identifier | null {
return this.targetId
}
public subscribeToStateChange(
listener: Listener,
options?: { handlerIds?: Identifier[] },
): Unsubscribe {
return this.internalMonitor.subscribeToStateChange(listener, options)
}
public canDrop(): boolean {
// Cut out early if the target id has not been set. This should prevent errors
// where the user has an older version of dnd-core like in
// https://github.com/react-dnd/react-dnd/issues/1310
if (!this.targetId) {
return false
}
invariant(
!isCallingCanDrop,
'You may not call monitor.canDrop() inside your canDrop() implementation. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target-monitor',
)
try {
isCallingCanDrop = true
return this.internalMonitor.canDropOnTarget(this.targetId)
} finally {
isCallingCanDrop = false
}
}
public isOver(options?: { shallow?: boolean }): boolean {
if (!this.targetId) {
return false
}
return this.internalMonitor.isOverTarget(this.targetId, options)
}
public getItemType(): Identifier | null {
return this.internalMonitor.getItemType()
}
public getItem(): any {
return this.internalMonitor.getItem()
}
public getDropResult(): any {
return this.internalMonitor.getDropResult()
}
public didDrop(): boolean {
return this.internalMonitor.didDrop()
}
public getInitialClientOffset(): XYCoord | null {
return this.internalMonitor.getInitialClientOffset()
}
public getInitialSourceClientOffset(): XYCoord | null {
return this.internalMonitor.getInitialSourceClientOffset()
}
public getSourceClientOffset(): XYCoord | null {
return this.internalMonitor.getSourceClientOffset()
}
public getClientOffset(): XYCoord | null {
return this.internalMonitor.getClientOffset()
}
public getDifferenceFromInitialOffset(): XYCoord | null {
return this.internalMonitor.getDifferenceFromInitialOffset()
}
}
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