QFormLayout , how to remove rows having widgets

Pradeep Kumar

Hi,

I am using QFormLayout, i am dynamically adding QLabel and QComboBox, to the rows using addrow(); if i try to add , previous elements are also present, how to remove rows of previously added.

for (int i = 1; i <= nrow; i++)
    {
        for (int j = 1; j <= ncol; j++)
        {
           QLabel *gridLabel = new QLabel ;
            gridLabel->setText(QString::number(i)) ;

            QComboBox *cb = new QComboBox;
            cb->addItems(camidList) ;

            m_pQFormLayoutGrid->addRow(gridLabel, cb);
        }
    }

How to remove previous rows from m_pQFormLayoutGrid, when i try to add new rows?.

Thanks,

Flotisable

@Pradeep-Kumar
QFormLayout::removeRow may be a choice

Pradeep Kumar

Hi,

I didnt find removeRow() for QFormLayout?.

Venkatesh V

Hi @Pradeep-Kumar

declare QObjectList in header file.
//In Header File

QObjectList objectList;

//In Function

if(objectList.length()!=0){
for(int item =0;item<objectList.length();item++){
delete objectList(item);
}
objectList.clear();
}
for (int i = 1; i <= nrow; i++)
{
for (int j = 1; j <= ncol; j++)
{
QLabel *gridLabel = new QLabel ;
gridLabel->setText(QString::number(i)) ;

        QComboBox *cb = new QComboBox;
        cb->addItems(camidList) ;

        m_pQFormLayoutGrid->addRow(gridLabel, cb);

objectList.append(gridLabel);
objectList.append(cb);
}
}

Try this.Above code may help you.

Flotisable

@Pradeep-Kumar
sorry, QFormLayout::removeRow is introduced in Qt 5.8
@Venkatesh-V's method is a good choice

by the way, @Venkatesh-V I think you don't need the if statement before the delete for, since the condition in for have test it

Pradeep Kumar

Hi,

@Venkatesh-V
Thank you it worked.
I was trying to remove Qformlayout items by taking itemAt().

Thanks,

Venkatesh V

@Flotisable
for the first time of method execution ObjectList size will be 0, on that time delete obectList item will crash the program because of index out of range. so i am setting flag there.

Pradeep Kumar

Hi,

if(objectList.length()!=0)
{
for(int item =0;item<objectList.length();item++)
{
delete objectList.at(item);
}
objectList.clear();
}

used the above line of code before adding to the QFormLayout.

It worked,
May be in 5.8 we can use QFormLayout::removeRow() i guess,
I will try in some while in 5.8 for QFormLayout.

Thanks @Venkatesh-V
@Flotisable ,

Thanks,

Venkatesh V

@Pradeep-Kumar
If it works fine, mark it as solved.