从 QTablewidget 中删除所选项目时发生崩溃

发布于 2024-12-26 06:55:13 字数 628 浏览 5 评论 0原文

我有一个带有以下设置的 QTablewidget

tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);

我试图删除用户选择的行并使用以下代码。但是，当选择并删除所有项目时，会导致崩溃。以下方法正确吗？谢谢。

tableWidget->setSortingEnabled(false);
QList<QTableWidgetItem *> selectedEntries = tableWidget->selectedItems();
foreach(QTableWidgetItem * currentItem, selectedEntries) 

{       
if (currentItem->row()!=-1) 
                      tableWidget->removeRow(currentItem->row());   

}
tableWidget->setSortingEnabled(true);

原文

I have a QTablewidget with the following settings

tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);

I am trying to delete the user selected rows and use the following code. However, it results in a crash when all items are selected and deleted. Is the following approach correct ? Thanks.

tableWidget->setSortingEnabled(false);
QList<QTableWidgetItem *> selectedEntries = tableWidget->selectedItems();
foreach(QTableWidgetItem * currentItem, selectedEntries) 

{       
if (currentItem->row()!=-1) 
                      tableWidget->removeRow(currentItem->row());   

}
tableWidget->setSortingEnabled(true);

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乖乖 2025-01-02 06:55:13

此操作的稍微不同的风格可以在诺基亚开发论坛< /a>，Ruzik提供的进化形式看起来像..

 QSet<int> selectedRows; //we use a set to prevent doubles
 QList<QTableWidgetItem*> itemList = tableWidget->selectedItems();
 QTableWidgetItem * item;
 foreach(item, itemList)
 selectedRows.insert(item->row());
 //get a list, and sort it big to small
 QList<int> rows = selectedRows.toList();
 qSort(rows.begin(), rows.end());
 //now actually do the removing:
 foreach(int row, rows)
  tableWidget->removeRow(row);

A slightly different flavor of this operation can be found in the Nokia dev forums, the evolved form provided by Ruzik looks like..

 QSet<int> selectedRows; //we use a set to prevent doubles
 QList<QTableWidgetItem*> itemList = tableWidget->selectedItems();
 QTableWidgetItem * item;
 foreach(item, itemList)
 selectedRows.insert(item->row());
 //get a list, and sort it big to small
 QList<int> rows = selectedRows.toList();
 qSort(rows.begin(), rows.end());
 //now actually do the removing:
 foreach(int row, rows)
  tableWidget->removeRow(row);

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烟火散人牵绊 2025-01-02 06:55:13

发生这种情况似乎是因为删除行会删除与该行关联的项目，因此可能在后续迭代中迭代已删除的项目，从而导致访问无效内存。

一个简单的替代方法是使用 QModelIndexList 获取选定的行并将其删除：

QModelIndexList indexes = ui->tableWidget->selectionModel()->selectedRows();
for (QModelIndex index : indexes) {
    ui->tableWidget->removeRow(index.row());

It seems this happens because removing the row deletes the items associated with the row, so it could be that in subsequent iterations you iterate over items that were already deleted, which results in accessing invalid memory.

A simple alternative is to use the QModelIndexList to get the selected rows and remove them:

QModelIndexList indexes = ui->tableWidget->selectionModel()->selectedRows();
for (QModelIndex index : indexes) {
    ui->tableWidget->removeRow(index.row());

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信仰 2025-01-02 06:55:13

这是一种使用最少 QT 并用 C++11 STD / STL 代码替换大部分内容的方法。（如果你像我一样更喜欢std而不是qt，但被迫与qt互操作）

// make sure it is sorted descending.
std::set<int, std::greater<int>> selectedRows;
auto itemList = tableWidget->selectedItems();
for (auto& item : itemList)
{
    selectedRows.insert(item->row());
}
for (int row : selectedRows)
{
    tableWidget->removeRow(row);
}

Here's an approach that uses minimal QT and replaces most of it with C++11 STD / STL code. (if you prefer std to qt like me, but are forced to interop with qt)

// make sure it is sorted descending.
std::set<int, std::greater<int>> selectedRows;
auto itemList = tableWidget->selectedItems();
for (auto& item : itemList)
{
    selectedRows.insert(item->row());
}
for (int row : selectedRows)
{
    tableWidget->removeRow(row);
}

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