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 { DragSourceMonitor } from '../types/index.js'
let isCallingCanDrag = false
let isCallingIsDragging = false
export class DragSourceMonitorImpl implements DragSourceMonitor {
private internalMonitor: DragDropMonitor
private sourceId: Identifier | null = null
public constructor(manager: DragDropManager) {
this.internalMonitor = manager.getMonitor()
}
public receiveHandlerId(sourceId: Identifier | null): void {
this.sourceId = sourceId
}
public getHandlerId(): Identifier | null {
return this.sourceId
}
public canDrag(): boolean {
invariant(
!isCallingCanDrag,
'You may not call monitor.canDrag() inside your canDrag() implementation. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drag-source-monitor',
)
try {
isCallingCanDrag = true
return this.internalMonitor.canDragSource(this.sourceId as Identifier)
} finally {
isCallingCanDrag = false
}
}
public isDragging(): boolean {
if (!this.sourceId) {
return false
}
invariant(
!isCallingIsDragging,
'You may not call monitor.isDragging() inside your isDragging() implementation. ' +
'Read more: http://react-dnd.github.io/react-dnd/docs/api/drag-source-monitor',
)
try {
isCallingIsDragging = true
return this.internalMonitor.isDraggingSource(this.sourceId)
} finally {
isCallingIsDragging = false
}
}
public subscribeToStateChange(
listener: Listener,
options?: { handlerIds?: Identifier[] },
): Unsubscribe {
return this.internalMonitor.subscribeToStateChange(listener, options)
}
public isDraggingSource(sourceId: Identifier): boolean {
return this.internalMonitor.isDraggingSource(sourceId)
}
public isOverTarget(
targetId: Identifier,
options?: { shallow: boolean },
): boolean {
return this.internalMonitor.isOverTarget(targetId, options)
}
public getTargetIds(): Identifier[] {
return this.internalMonitor.getTargetIds()
}
public isSourcePublic(): boolean | null {
return this.internalMonitor.isSourcePublic()
}
public getSourceId(): Identifier | null {
return this.internalMonitor.getSourceId()
}
public subscribeToOffsetChange(listener: Listener): Unsubscribe {
return this.internalMonitor.subscribeToOffsetChange(listener)
}
public canDragSource(sourceId: Identifier): boolean {
return this.internalMonitor.canDragSource(sourceId)
}
public canDropOnTarget(targetId: Identifier): boolean {
return this.internalMonitor.canDropOnTarget(targetId)
}
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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