C++ 我如何遍历 QListWidget 项目并处理每个项目？
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How can i iterate through QListWidget items and work with each item?
提问by Rika
In CSharp its as simple as writting :
在 CSharp 中，它就像编写一样简单：
listBox1.Items.Add("Hello");
listBox1.Items.Add("There");
foreach (string item in listBox1.Items )
{
MessageBox.Show(item.ToString());
}
and I can easily add different objects to a list box and then retrieve them using foreach. I tried the same approach in Qt 4.8.2 but it seems they are different. Though they look very similar at the first. I found that Qt supports foreach so I went on and tried something like :
我可以轻松地将不同的对象添加到列表框中，然后使用 foreach 检索它们。我在 Qt 4.8.2 中尝试了相同的方法，但它们似乎不同。尽管它们一开始看起来非常相似。我发现 Qt 支持 foreach 所以我继续尝试类似的东西：
foreach(QListWidgetItem& item,ui->listWidget->items())
{
item.setTextColor(QColor::blue());
}
which failed clearly. It says the items() needs a parameter which confuses me. I am trying to iterate through the ListBox itself, so what does this mean? I tried passing the ListBox object as the parameter itself this again failed too:
这显然失败了。它说 items() 需要一个让我感到困惑的参数。我正在尝试遍历 ListBox 本身，这是什么意思？我尝试将 ListBox 对象作为参数本身传递，这也再次失败：
foreach(QListWidgetItem& item,ui->listWidget->items(ui->listWidget))
{
item.setTextColor(QColor::blue());
}
So here are my questions:
所以这里是我的问题：
- How can I iterate through a QListWidget items in Qt?
- Can I store objects as items in QListWidgets like C#?
- How can I convert an object in QListWidgets to string(C#s ToString counter part in Qt) ?
- 如何遍历 Qt 中的 QListWidget 项目？
- 我可以像 C# 一样将对象存储为 QListWidgets 中的项目吗？
- 如何将 QListWidgets 中的对象转换为字符串（Qt 中的 C#s ToString 计数器部分）？
(Suppose I want to use a QMessagBox instead of that setTextColor and want to print out all string items in the QlistWidget.)
（假设我想使用 QMessagBox 而不是 setTextColor 并且想打印出 QlistWidget 中的所有字符串项。）
回答by Xavier Holt
I don't think the items functiondoes what you think it does. It sounds like it's for decoding MIME data, not getting a list of all the items in the widget.
我不认为items 函数会做你认为的那样。这听起来像是用于解码 MIME 数据，而不是获取小部件中所有项目的列表。
I don't actually see any function to do exactly what you want, sadly. You could probably use findItemsas a workaround, but that seems ugly, if not downright abusive... At least you can still use the item functionwith good old forloops - they're not thatmuch more typing:
遗憾的是，我实际上没有看到任何功能可以完全按照您的要求执行。你也许可以使用findItems作为一种解决方法，但似乎难看，如果不是彻头彻尾的滥用......至少，你仍然可以使用产品功能与良好的老for循环-他们没有说更多的打字：
for(int i = 0; i < listWidget->count(); ++i)
{
QListWidgetItem* item = listWidget->item(i);
//Do stuff!
}
Hope that helps!
希望有帮助！
回答by Thierry Joel
You can do something like this:
你可以这样做：
for(int i = 0; i < listWidget->count(); ++i)
{
QString str = listwidget.item(i)->text();
//Do stuff!
}
回答by Thierry Joel
Try making a pointer to each of the items if you are making the list items in code. But, if you are using the .ui file to make a list item try right clicking it and hitting edit stylesheet. You can edit it very easily that way.
如果您在代码中创建列表项，请尝试创建指向每个项的指针。但是，如果您使用 .ui 文件制作列表项，请尝试右键单击它并点击编辑样式表。您可以通过这种方式非常轻松地对其进行编辑。
