如何从QTableWidget中删除所有的行

I am trying to delete all rows from a QTableWidget . Here is what I tried.

我试图从QTableWidget中删除所有的行。这就是我所尝试的。

for ( int i = 0; i < mTestTable->rowCount(); ++i )
{
    mTestTable->removeRow(i);
}

I had two rows in my table. But this just deleted a single row. A reason could be that I did not create the the table with a fixed table size. The Qt Documentation for rowCount() says,

我的桌子上有两排。但这只删除了一行。原因可能是我没有创建具有固定表大小的表。rowCount()的Qt文档说，

This property holds the number of rows in the table.

此属性保存表中的行数。

By default, for a table constructed without row and column counts, this property contains a value of 0.

默认情况下，对于没有行和列计数的表，此属性包含一个0值。

So if that is the case, what is the best way to remove all rows from table?

如果是这样，从表中删除所有行的最佳方法是什么?

10 个解决方案

#1

Just set the row count to 0 with:

只需将行数设置为0，其中:

mTestTable->setRowCount(0);

it will delete the QTableWidgetItems automatically, by calling removeRows as you can see in QTableWidget internal model code:

它将通过调用removeRows自动删除QTableWidgetItems，如QTableWidget内部模型代码所示:

void QTableModel::setRowCount(int rows)
{
    int rc = verticalHeaderItems.count();
    if (rows < 0 || rc == rows)
        return;
    if (rc < rows)
        insertRows(qMax(rc, 0), rows - rc);
    else
        removeRows(qMax(rows, 0), rc - rows);
}

#2

I don't know QTableWidget but your code seems to have a logic flaw. You are forgetting that as you go round the loop you are decreasing the value of mTestTable->rowCount(). After you have removed one row, i will be one and mTestTable->rowCount() will also be one, so your loop stops.

我不知道QTableWidget，但是你的代码似乎有逻辑缺陷。您正在忘记，当您执行循环时，您正在减少mTestTable->rowCount()的值。在删除了一行之后，i将是1,mTestTable->rowCount()也将是1，因此循环将停止。

I would do it like this

我应该这样做

while (mTestTable->rowCount() > 0)
{
    mTestTable->removeRow(0);
}

#3

AFAIK setRowCount(0) removes nothing. Objects are still there, but no more visible.

AFAIK setRowCount(0)删除。物体仍然存在，但不再可见。

yourtable->model()->removeRows(0, yourtable->rowCount());

#4

QTableWidget test;
test.clear();
test.setRowCount( 0);

#5

The simple way to delete rows is to set the row count to zero. This uses removeRows() internally.

删除行的简单方法是将行计数设置为零。它使用removeRows内部()。

table->setRowCount(0);

You could also clear the content and then remove all rows.

您还可以清除内容，然后删除所有行。

table->clearContents();
table->model()->removeRows(0, table->rowCount());

Both snippets leave the headers untouched!

这两段代码都没有修改页眉!

If you need to get rid of headers, too, you could switch from clearContents() to clear().

如果需要删除header，可以从clearContents()切换到clear()。

#6

In order to prevent an app crash, disconnect all signals from the QTableView.

为了防止应用程序崩溃，断开QTableView的所有信号。

// Deselects all selected items
ui->tableWidget->clearSelection();

// Disconnect all signals from table widget ! important !
ui->tableWidget->disconnect();

// Remove all items
ui->tableWidget->clearContents();

// Set row count to 0 (remove rows)
ui->tableWidget->setRowCount(0);

#7

Your code does not delete last row.

代码不删除最后一行。

Try this one.

试试这个。

int totalRow = mTestTable->rowCount();
for ( int i = 0; i < totalRow ; ++i )
{
       mTestTable->removeRow(i);
}

In your code, on the first time, rowCount() have value 2 and value of the i is 0, so its delete 1st row,

在代码中，第一次，rowCount()的值为2,i的值为0，所以第一行删除，

But on the second time value of i incremented with 1, but rowCount() return the updated row count which is now 1, so, it does not delete the last row.

但是，在第二次的值中，我增加了1，但是rowCount()返回了更新后的行数，现在是1，因此，它不会删除最后一行。

Hope now you ll be clear.

希望你现在明白了。

#8

Removes all items not in the headers from the view. This will also remove all selections. The table dimensions stay the same.

从视图中删除不在页眉中的所有项。这也将删除所有选择。表的尺寸保持不变。

void QTableWidget::clearContents()

Removes all items in the view. This will also remove all selections and headers.

删除视图中的所有项。这也将删除所有的选择和标题。

void QTableWidget::clear()

#9

Look this post : http://forum.qt.io/topic/1715/qtablewidget-how-to-delete-a-row

看看这篇文章:http://forum.qt.io/topic/1715/qtablewidget- to-delete-a-row

QList<QTableWidgetItem*> items = table.findItems(.....);
QMap<int, int> rowsMap;
for(int i = 0; i < items.count(); i++{
  rowsMap[items.at(i).row()] = -1; //garbage value
}
QList<int> rowsList = rowsMap.uniqueKeys();
qSort(rowsList);

//Now go through your table and delete rows in descending order as content would shift up and hence cannot do it in ascending order with ease.
for(int i = rowList.count() - 1; i >= 0; i--){
  table.removeRow(rowList.at(i));
}

#10

You can just add empty item model (QStandardItemModel) to your QTableView (myTableView):

您可以将空项目模型(qstandardtemmodel)添加到QTableView (myTableView):

itemModel = new QStandardItemModel;
ui->myTableView->setModel(itemModel);