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fix(AgentIO): 跟滚误关根治——_track_follow按scrollTop减小判用户上翻

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旧实现按gap判follow:异步widget挂载使scroll事件滞后,程序滚底后gap瞬时>80
被误判为用户上翻→follow关→第二条消息后输出不再跟滚
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yumoqing 2026-09-02 11:02:51 +08:00
parent 4815e1e54d
commit d3cff3e923
1 changed files with 14 additions and 1 deletions
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15
bricks/agent.js
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@ -357,7 +357,20 @@ bricks.AgentIO = class extends bricks.VBox {
_track_follow(){
var e = this.msg_box && this.msg_box.dom_element;
if (!e) return;
this._follow = (e.scrollHeight - e.scrollTop - e.clientHeight) < 80;
var st = e.scrollTop;
var near = (e.scrollHeight - st - e.clientHeight) < 80;
if (near) {
// 滚回底部附近 → 恢复跟滚
this._follow = true;
} else if (this._last_st !== undefined && st < this._last_st - 5) {
// scrollTop 减小 = 用户真上翻 → 暂停跟滚。
// 程序滚底只会增大 scrollTop；异步 widget 挂载使 scroll 事件滞后时
// gap 会瞬时 >80，但 st 不减小——不能误判为用户上翻（2026-09-01 根因：
// 旧实现按 gap 判 follow，第二条消息后程序滚底被自己的 scroll 事件
// 误关 follow，后续输出不再跟滚）。
this._follow = false;
}
this._last_st = st;
}
chunk_response(mout, l){
l = l.trim();