DragSourceMonitorImpl.js
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import { invariant } from '@react-dnd/invariant';
let isCallingCanDrag = false;
let isCallingIsDragging = false;
export class DragSourceMonitorImpl {
receiveHandlerId(sourceId) {
this.sourceId = sourceId;
}
getHandlerId() {
return this.sourceId;
}
canDrag() {
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);
} finally{
isCallingCanDrag = false;
}
}
isDragging() {
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;
}
}
subscribeToStateChange(listener, options) {
return this.internalMonitor.subscribeToStateChange(listener, options);
}
isDraggingSource(sourceId) {
return this.internalMonitor.isDraggingSource(sourceId);
}
isOverTarget(targetId, options) {
return this.internalMonitor.isOverTarget(targetId, options);
}
getTargetIds() {
return this.internalMonitor.getTargetIds();
}
isSourcePublic() {
return this.internalMonitor.isSourcePublic();
}
getSourceId() {
return this.internalMonitor.getSourceId();
}
subscribeToOffsetChange(listener) {
return this.internalMonitor.subscribeToOffsetChange(listener);
}
canDragSource(sourceId) {
return this.internalMonitor.canDragSource(sourceId);
}
canDropOnTarget(targetId) {
return this.internalMonitor.canDropOnTarget(targetId);
}
getItemType() {
return this.internalMonitor.getItemType();
}
getItem() {
return this.internalMonitor.getItem();
}
getDropResult() {
return this.internalMonitor.getDropResult();
}
didDrop() {
return this.internalMonitor.didDrop();
}
getInitialClientOffset() {
return this.internalMonitor.getInitialClientOffset();
}
getInitialSourceClientOffset() {
return this.internalMonitor.getInitialSourceClientOffset();
}
getSourceClientOffset() {
return this.internalMonitor.getSourceClientOffset();
}
getClientOffset() {
return this.internalMonitor.getClientOffset();
}
getDifferenceFromInitialOffset() {
return this.internalMonitor.getDifferenceFromInitialOffset();
}
constructor(manager){
this.sourceId = null;
this.internalMonitor = manager.getMonitor();
}
}
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