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快速拖动scrollrect之后，导致不应该被移除的item被移除 #149

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junbinliuext opened this issue Oct 11, 2022 · 1 comment
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快速拖动scrollrect之后，导致不应该被移除的item被移除 #149

junbinliuext opened this issue Oct 11, 2022 · 1 comment

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@junbinliuext
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如gif所示快速拖动scrollrect(大概1~2帧)，会导致scrollrect排在前面的item被删掉了，然后导致scrollrect无法正常回弹。
bandicam 2022-10-11 15-38-54-374 mp4_20221011_155029

排查了一下原因，发现是LoopVerticalScrollRect的UpdateItems中，关于DeleteItemAtStart 和 NewItemAtEnd的时序不太对，应该先NewItemAtEnd再DeleteItemAtStart ，这样才能正确的触发DeleteItemAtStart中的Special Case，从而保证排在前面的item不被错误地删除。
Snipaste_2022-10-11_16-18-41

按照上面说的反转两者的执行顺序，能够解决gif中的问题。
qiankanglai added a commit that referenced this issue Oct 22, 2022
@qiankanglai
fix issue #149: new item before delete (thanks to @junbinliuext)
e5e343e
@qiankanglai
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抱歉由于项目太忙 没有及时反馈orz
问题确实存在，已按照建议修复，非常感谢！

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@qiankanglai @junbinliuext