Thanks to all for the replies.

I finally resolved the issue by replacing the TableView by a ListView and rewriting the columns handling manually. As the ListView draws the whole item content once, all the above mentioned issues are resolved at the same time.

However very interesting concepts were presented here, and they may help me for other similar situations in the future. Once again, thank you very much to took the time to help me and reply to my questions.

@xintrea said in How to recognize padding for a QTableView table item?:

not the default style.

Only the stylesheet style provides a padding (see box model), all other styles don't have a 'padding' value at all. So what do you want exactly (and why)?

@AloyseTech IIRC hidePop() will reset the Popupwidget, so maybe hijack the add/remove process.
Call hidePopup before adding are removing item and call showPopup afterwards?

If you need this for just measuring the performance of your application, maybe you should use the QML Profiler instead http://doc.qt.io/qtcreator/creator-qml-performance-monitor.html

This is strange. could you try if this snippet works for you?

#include <QApplication> #include <QWidget> #include <QVBoxLayout> #include <QPushButton> #include <QTableWidget> #include <QLabel> int main(int argc, char *argv[]) { QApplication a(argc, argv); QWidget mainWid; QStringList changedValues; QVBoxLayout* mainLay=new QVBoxLayout(&mainWid); QTableWidget* tableWidget = new QTableWidget(&mainWid); QPushButton* button = new QPushButton(QStringLiteral("Display list"),&mainWid); QLabel* resultLabel = new QLabel(&mainWid); mainLay->addWidget(tableWidget); mainLay->addWidget(button ); mainLay->addWidget(resultLabel ); tableWidget->setColumnCount(1); tableWidget->setRowCount(5); for(int i=0;i<5;i++){ QTableWidgetItem* const newItem= new QTableWidgetItem; newItem->setData(Qt::EditRole,i); tableWidget->setItem(i,0,newItem); } QObject::connect(tableWidget,&QTableWidget::cellChanged,[&changedValues,tableWidget](int row, int column)->void{changedValues<<tableWidget->item(row,column)->text();}); QObject::connect(button ,&QPushButton::clicked,[&changedValues,resultLabel ]()->void{resultLabel->setText(changedValues.join(','));}); mainWid.show(); return a.exec(); }

separate QTableWidget into a QTableView and a QStandardItemModel add a QSortFilterProxyModel as the model of QTableView and set the QStandardItemModel as the QSortFilterProxyModel's sourceModel call QSortFilterProxyModel::setFilterWildcard or QSortFilterProxyModel::setFilterRegExp to perform the searching

See Basic Sort/Filter Model Example

@Lasith
Instead of 100 use ui->tableWidget->rowCount().

@raven-worx
Thanks bro,
very helpfull.

Edit: I have checked that if coordinates are [0.3 0.5 0.3 0.9] and I set pen.widthf bigger, then I can select much better the lines, but if the coordinates are [30 50 30 90] that does not work...

Thank you. It worked.

Thanks for your reply.

Using setText will avoid useless delete/allocation of items.

When you set the item, The table takes ownership of the item. So just deleting the tableWidget should satisfy. If you want to selectively delete, what you are doing should be good enough.

@kylecorver Can you post the complete program? The original isn't a a valid Qml document, leading to guessing about which errors will or will not occur. The OS and Qt version used might also be relevant.

@Lorence said:

Hi when you add "xxxx" to a qlistwidget
you are adding a QListWidgetItem.

While you can subclass QListWidgetItem and make your own
that has signals, it would not do you so much good as

it would never never emit such signal unless you also made it do
so when something happen to it. (overriding some of its functions)

So It all depends what you are trying to do.
If you just want to know its no 1,2,3 etc, even if moved
then
you can insert that info into the QListWidgetItem using the
void QListWidgetItem::setData(int role, const QVariant & value)

something like
QListWidgetItem * item=new QListWidgetItem("item1") ;
item->setData(Qt::UserRole, 1); // or 2 for item 2 etc
list->addItem(item)

then you can always know which is which even if rearranged.
see here for how to take index out also
http://stackoverflow.com/questions/7136818/can-i-store-some-user-data-in-every-item-of-a-qlistwidget

@SGaist Thank you dude, setCurrentRow is what I want!

Hi,

You are looking for QTreeWidget::setCurrentItem

Yeah, according to QComboBox code should work:

QVariant QComboBox::itemData(int index, int role) const { Q_D(const QComboBox); QModelIndex mi = d->model->index(index, d->modelColumn, d->root); return d->model->data(mi, role); }

Will implement this.

I do not understand last question. I do not see any problem with mapping which rely on the item bounding rectangle.

You can have an infinite number of visually the same graphics items if you use different combination of position and bounding box parameters.

For example if you create QGraphicsEllipseItem using following rectangle/position pairs you will get the same result on the screen?
pair 1:
QRectF rect1( 0, 0, 1., 2 );
QPointF pos1(10.,20.);
pair 2:
QRectF rect1( 10,20, 1., 2 );
QPointF pos1(0.,0.);

Which way to define depends on your needs.