bc518174
 王天杨
提交两个项目文件
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import type { DragDropMonitor, DragSource, Identifier } from 'dnd-core'
import type { Connector } from '../../internals/index.js'
import type { DragSourceMonitor } from '../../types/index.js'
import type { DragObjectFactory, DragSourceHookSpec } from '../types.js'
export class DragSourceImpl<O, R, P> implements DragSource {
public constructor(
public spec: DragSourceHookSpec<O, R, P>,
private monitor: DragSourceMonitor<O, R>,
private connector: Connector,
) {}
public beginDrag() {
const spec = this.spec
const monitor = this.monitor
let result: O | null = null
if (typeof spec.item === 'object') {
result = spec.item as O
} else if (typeof spec.item === 'function') {
result = (spec.item as DragObjectFactory<O>)(monitor)
} else {
result = {} as O
}
return result ?? null
}
public canDrag() {
const spec = this.spec
const monitor = this.monitor
if (typeof spec.canDrag === 'boolean') {
return spec.canDrag
} else if (typeof spec.canDrag === 'function') {
return spec.canDrag(monitor)
} else {
return true
}
}
public isDragging(globalMonitor: DragDropMonitor, target: Identifier) {
const spec = this.spec
const monitor = this.monitor
const { isDragging } = spec
return isDragging
? isDragging(monitor)
: target === globalMonitor.getSourceId()
}
public endDrag() {
const spec = this.spec
const monitor = this.monitor
const connector = this.connector
const { end } = spec
if (end) {
end(monitor.getItem(), monitor)
}
connector.reconnect()
}
}
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