bc518174
 王天杨
提交两个项目文件
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import { union, without } from './utils/js_utils.js';
export class EnterLeaveCounter {
enter(enteringNode) {
const previousLength = this.entered.length;
const isNodeEntered = (node)=>this.isNodeInDocument(node) && (!node.contains || node.contains(enteringNode))
;
this.entered = union(this.entered.filter(isNodeEntered), [
enteringNode
]);
return previousLength === 0 && this.entered.length > 0;
}
leave(leavingNode) {
const previousLength = this.entered.length;
this.entered = without(this.entered.filter(this.isNodeInDocument), leavingNode);
return previousLength > 0 && this.entered.length === 0;
}
reset() {
this.entered = [];
}
constructor(isNodeInDocument){
this.entered = [];
this.isNodeInDocument = isNodeInDocument;
}
}
//# sourceMappingURL=EnterLeaveCounter.js.map
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