Store content of QTableWidget into a buffer variable

Kampi

Hello,

I have a configuration window with a table to add some filter options. A user can add more filter with an "Add" Button to the table. The filter rules getting stored after the user pressed a "OK" button. If the user close the window without pressing "OK" the new input should be discarded.
The current implementation doesn´t discard the new input after closing the window. My idea is to store the table into a buffer when the user is pressing the "OK" buffer and load this buffer when the user open the configuration window again.

I write this method to store the current table to the buffer:

void Filter::saveTable( void )
{
    tableBuffer->setRowCount(ui->tableWidget->rowCount());
    tableBuffer->setColumnCount(ui->tableWidget->columnCount());

    for(int i_Row = 0; i_Row < ui->tableWidget->rowCount(); i_Row++)
    {
        for(int i_Column = 0; i_Column < ui->tableWidget->colorCount(); i_Column++)
        {
            QTableWidgetItem* Item = ui->tableWidget->item(i_Row, i_Column);

            tableBuffer->setItem(i_Row, i_Column, Item);
        }
    }
}

I got this message when I try to save the current table from the ui into the buffer:

QPaintDevice::metrics: Device has no metric information

What is the problem? Does Qt support a better solution to discard changes in a table when the table window got closed without pressing "OK"?

mrjj

Hi
Are you sure
"QPaintDevice::metrics: Device has no metric information"
comes from this code?

Also,
QTableWidgetItem* Item = ui->tableWidget->item(i_Row, i_Column);
tableBuffer->setItem(i_Row, i_Column, Item);

So u take the item from one TableWidget and insert into another table?

Im not sure it works as we think as then its shared between 2 widgets?
So both will try to delete it?

Does Qt support a better solution to discard changes in a table

Well not pr automatic, but normally you would have data (the filters) in its own class/list.
Then when open the Editor, load data to the table
If user dont press ok, simply not save table back to master data list.

Kampi

Hello

yes I´m sure, because I doesn´t get this message anymore after removing this lines.
Reloading the data is a better idea I think. Thank you for this hint. I think I will solve it in this way.

mrjj

@Kampi
Hi
ok. its just it sound like something with painting and all you
do is adding items. But must be indirectly then.
seems to come from qpaintdevice.cpp
ifndef Q_WS_QPA
int QPaintDevice::metric(PaintDeviceMetric) const
{
qWarning("QPaintDevice::metrics: Device has no metric information");
return 0;
}
#endif

So seems its simply not compiled in?

Anyway, hopefully it will go away with your new design :)

Ivan Kosik

@Kampi
Hello,
You have a typo in this line:

for(int i_Column = 0; i_Column < ui->tableWidget->colorCount(); i_Column++)

Change ***color***Count() to ***column***Count()

Qt6 topics merged with General

Store content of QTableWidget into a buffer variable