15 lines
1.9 KiB
TypeScript
15 lines
1.9 KiB
TypeScript
/**
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* 浏览器指针捕获的容错边界。这里只处理 DOM 事件传输所有权；手势 token、预览和几何仍归 editor/session。
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* DOM 捕获丢失不等于任意事件都能取消当前手势，必须匹配指针与捕获目标。
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*/
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/** Transport ownership only: document geometry and gesture tokens stay in the editor. */
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/** 最小结构化 DOM 端口，让纯测试无需真实 HTMLElement。 */
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export type PointerCapturePort={setPointerCapture(id:number):void;hasPointerCapture(id:number):boolean;releasePointerCapture(id:number):void};
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/** 普通事件匹配 pointerId 即可；lostpointercapture 还要匹配原捕获目标且确认它已失去捕获。
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* 如果同目标已重新捕获该指针，旧 lost 事件不拥有新手势；脱离 DOM 导致查询抛错则允许匹配目标清理。 */
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export function ownsPointerCapture(owner:{pointerId:number;capture:unknown}|null|undefined,input:{pointerId:number;type?:string;target?:unknown}){if(!owner||owner.pointerId!==input.pointerId)return false;if(input.type!=='lostpointercapture')return true;if(input.target!==owner.capture)return false;const capture=owner.capture as Partial<PointerCapturePort>|undefined;try{if(capture?.hasPointerCapture?.(owner.pointerId))return false;}catch{/* A detached matching target may still need cancellation. */}return true;}
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/** 平台可能因指针失效/节点卸载拒绝捕获，以布尔结果交给宿主决定是否继续手势。 */
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export function acquirePointerCapture(target:PointerCapturePort,id:number){try{target.setPointerCapture(id);return true;}catch{return false;}}
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/** 尽力释放且吞掉平台清理异常；DOM 释放失败不能取得 editor 的提交或取消权限。 */
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export function releasePointerCapture(target:PointerCapturePort,id:number){try{if(target.hasPointerCapture(id))target.releasePointerCapture(id);}catch{/* Detached DOM or an already released platform capture has no editor authority. */}}
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