QStandardItemModel :: removeRows()在我的用例中不起作用

问题描述

基本上，我想删除模型中的所有行.我希望使用removeRows(..)而不是clear()，因为我想保留标题.

Basically I want to delete all rows in my model. I'd prefer to use removeRows(..) instead of clear(), because I want to keep my headers.

我想我已经错过了一些东西(在此处添加文档) ，我的代码非常简单:

I guess I have missed something (docu here), my code is pretty simple:

int c = MainWindow::_viewDataModel->rowCount();
bool r = MainWindow::_viewDataModel->removeRows(0, c);

c例如为4，但r始终为false.我已经尝试将0和1作为第一个索引.使用clear()可行.上面的代码完全没有影响.

c e.g. is 4, but r is always false. I have tried 0 and 1 as first index. Using clear() works. The above code has no impact at all.

推荐答案

它现在正在工作.经过一些测试后，我的发现:

It is working now. After some testing my findings:

当我指定要删除的模型中的行较少时，
• RemoveRows非常敏感.
• 在我的特殊情况下，确实发生了我只想在模型中还剩下4行的情况下想删除5行的情况.因此，如果模型中只有3行，_viewDataModel->removeRows(0, 4);根本不会删除任何内容.
• 与预期的情况(在这种情况下完全没有删除)一样.
• 我现在的解决方案是在删除之前彻底获取模型大小.

• RemoveRows is very sensitive when there are less rows in the model as I do specify for deletion.
• In my particular case it did happen that I wanted to delete 5 rows when only 4 rows were still in the model. So _viewDataModel->removeRows(0, 4); does not remove anything at all if there are just 3 rows in the model.
• Unlike expected in such as case no deletion took place at all.
• My solution right now is to thoroughly get the model size before deleting.

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