DragSourceImpl.js
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export class DragSourceImpl {
beginDrag() {
const spec = this.spec;
const monitor = this.monitor;
let result = null;
if (typeof spec.item === 'object') {
result = spec.item;
} else if (typeof spec.item === 'function') {
result = spec.item(monitor);
} else {
result = {};
}
return result !== null && result !== void 0 ? result : null;
}
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;
}
}
isDragging(globalMonitor, target) {
const spec = this.spec;
const monitor = this.monitor;
const { isDragging } = spec;
return isDragging ? isDragging(monitor) : target === globalMonitor.getSourceId();
}
endDrag() {
const spec = this.spec;
const monitor = this.monitor;
const connector = this.connector;
const { end } = spec;
if (end) {
end(monitor.getItem(), monitor);
}
connector.reconnect();
}
constructor(spec, monitor, connector){
this.spec = spec;
this.monitor = monitor;
this.connector = connector;
}
}
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