问题
I have a QTableWidget
, some columns are filled with text, some with numbers, these columns are fine to sort. But I also have a column with custom widgets, how should I enable sorting for these?
My first thought was of course to overload the '<'
method on the QTableWidgetItem
, but there are no QTableWidgetItem
. So what would be the best way to solve this?
回答1:
QTableWidget
is not ideal for this case, consider using QTableView
. Anyway, I will show you how to sort a QProgressBar
widget in a QTableWidget
.
As you already said, you can overload the <() operator
for this case. Let's say you have a QProgressBar
in column number 4. You have to overload the <()
operator.
You have to subclass QProgressBar
and QTableWidgetItem
.
class CustomTableWidgetItem : public QProgressBar, public QTableWidgetItem
{
Q_OBJECT
public:
CustomTableWidgetItem( QWidget* parent ) : QProgressBar( parent )
{
}
CustomTableWidgetItem(const QString txt = QString("0"))
:QTableWidgetItem(txt)
{
}
bool operator <(const QTableWidgetItem& other) const
{
if(other.column() == 0 /* numeric cell */) {
return QTableWidgetItem::text().toInt() < other.text().toInt();
}
else if(other.column() == 4 /* progress bar */) {
const QProgressBar *p = dynamic_cast<const QProgressBar *>(&other);
if(p != 0) {
if(this->value() < p->value())
return true;
}
}
return false;
}
};
And then you can insert your QProgressBar like this in cell number 4.
Insert QProgressBar
like this
ui->tableWidget->insertRow(ui->tableWidget->rowCount());
CustomTableWidgetItem *pgbar = new CustomTableWidgetItem(this);
ui->tableWidget->setCellWidget(ui->tableWidget->rowCount()-1, 4, pgbar);
ui->tableWidget->setItem(ui->tableWidget->rowCount()-1, 4, pgbar);
Let's say you want to have simple text at cell 1 use QTableWidgetItem
.
ui->tableWidget->setItem(ui->tableWidget->rowCount()-1, 1, new QTableWidgetItem("Hello"));
If you want to sort numbers as well, for example in cell 0 use CustomTableWidgetItem, since we have implemented an if-statement as you can see above for sorting numbers and progressbar.
ui->tableWidget->setItem(ui->tableWidget->rowCount()-1, 0, new CustomTableWidgetItem(QString::number(ui->tableWidget->rowCount())));
You can use this approach with other widgets as well, just subclass the correct widget, but in general it's better to use QTableView (MVC approach).
Here is a screenshot with QTableWidget
and QProgressBar
sorting.
来源:https://stackoverflow.com/questions/49390129/qt-how-can-i-sort-qtablewidget-column-if-the-cells-are-widgets