QHBoxLayout that contains two QTableWidget,no display in paintevent

stephane78

Hi,
I have two QTableWidget in a QDialog.I insert row in the paintevent method of the Dialog and I do update in a slot that receive signals.the rows are well displayed.
if I put a QHBoxlayout that contains the two QTableWIdget I don't see anymore my rows. I have tryed with ui->horizontallayout->invalidate() after the update() but it doesn't display my rows (now I have removed the QHboxlayout)
is there any solution to display my inserted rows in my QTableWidget with a Layout that contains my two QTableWIdget ?

SGaist

Hi,

Why are you adding rows in the paintEvent ? It's not the place to do such kind of stuff.

stephane78

@SGaist even if i add all my rows in the slot where I call update and then after I call update, I think there won't appear because of the Layout.is there anything to do with the layout like invalidate or update?

SGaist

Show your code please. Layouts have nothing to do with the updates of QTableWidget when you change the number of rows.

stephane78

@SGaist I have moved my code, where I insert rows, outside the paintevent, and it works well without layout, and it doesn't work with a layout , that contains my QTableWidget
so the code is copyrighted but I give the slot that insert row :

void DialogTransferts::Onrundownload(listfiles *lf)
{
  downloadlist=lf;
  ui->tableWidgetDown->clearContents();

  while(!ldownloaditems.isEmpty())
  {
      TableWidgetFListItem *pli=ldownloaditems.at(0);
      ldownloaditems.removeAt(0);
      delete pli;
  }
  ldownloaditems.clear();
  if(downloadlist&&downloadlist->count())
  {
   for(int i=downloadlist->count()-1;i>=0;i--)
 {
           MyFichier *monFichier=downloadlist->at(i);
           TableWidgetFListItem *pli  =new TableWidgetFListItem(monFichier,monFichier->nomSymbolique(),monFichier->taille(),ui->tableWidgetDown);

           ui->tableWidgetDown->insertRow(0);
           ui->tableWidgetDown->setCellWidget(0,0,(QWidget*)pli);

           ldownloaditems.append(pli);

  }
  }
  ui->tableWidgetDown->resizeRowsToContents();


  this->update();
  //ui->horizontalLayout->invalidate();

}

SGaist

Might be a silly question: did you set the layout on your DialogTransferts widget ?

By the way, why use a QTableWidget at all since you are only using setCellWidget ? A QScrollArea might be enough.

stephane78

@SGaist Ihave put a resizeRowsToContents(); at the beginning of the function and now it is ok I can see the rows...

SGaist

With the method you are using, there's no row content per see since you are only putting widgets everywhere. Hence my question stays: why use a QTableWidget since you seem to have one column of widgets ?

stephane78

@SGaist the class that I used derivates from QTableWidgetItem and QWidget so it is a QTableWidgetitem too. I have already used this class in another software and there isn't any problem with it.(it allows me to put a QPushButton with a bitmap in it)

J.Hilk

@stephane78

The simplest way to create a button with a bitmap in it is using stylesheets. No need to make your own class for that:

QPushButton *myButton = new QPushButton();
myButton->setStyleSheet("QPushButton{border-image:url(:/myButtonIcon.bmp);"}
myButton->show();

learned that by accidently reading through the whole entry of the docu about styleSheets.

Back than, that was a real facepalm moment for me.

of course it was at the very last entry. HERE

stephane78

@J.Hilk It allows me to put a button in a QTablewidgetItem,sorry my english is not perfect